Kubernetes集群部署：k8s部署、pod管理、资源清单、控制器、Service
文章目录kubernetes部署1.master端部署2.node端部署kubernetes部署Kubernetes对计算资源进行了更高层次的抽象，通过将容器进行细致的组合，将最终的应用服务交给用户。官方网站：https://kubernetes.io/docs/setup/production-environment/container-runtimes/#docker1.master端部署可以
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一、kubernetes部署
- Kubernetes对计算资源进行了更高层次的抽象，通过将容器进行细致的组合，将最终的应用服务交给用户。
- 官方网站：https://kubernetes.io/docs/setup/production-environment/container-runtimes/#docker
1.master端部署
可以新开2个虚拟机，安装docker
%server2作为master端
[root@server2 yum.repos.d]# ls
docker-ce.repo dvd.repo redhat.repo
[root@server2 yum.repos.d]# vim dvd.repo
[root@server2 ~]# vim /etc/hosts#解析要改
[root@server2 ~]# cd docker-ce/
[root@server2 docker-ce]# ls
containerd.io-1.4.3-3.1.el7.x86_64.rpm
container-selinux-2.119.2-1.911c772.el7_8.noarch.rpm
docker-ce-20.10.2-3.el7.x86_64.rpm
docker-ce-cli-20.10.2-3.el7.x86_64.rpm
docker-ce-rootless-extras-20.10.2-3.el7.x86_64.rpm
fuse3-libs-3.6.1-4.el7.x86_64.rpm
fuse-overlayfs-0.7.2-6.el7_8.x86_64.rpm
repodata
slirp4netns-0.4.3-4.el7_8.x86_64.rpm
[root@server2 docker-ce]# yum install docker-ce docker-ce-cli
[root@server2 docker-ce]# systemctl start docker
[root@server2 docker]# systemctl enable docker
[root@server2 docker]# vim /etc/docker/daemon.json
{
"registry-mirrors": ["https://reg.westos.org"],
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2",
"storage-opts": [
"overlay2.override_kernel_check=true"
]
}
%拉取阿里云镜像，加快部署
[root@server2 docker]# vim /etc/yum.repos.d/k8s.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=0
# yum install -y kubelet kubeadm kubectl
# systemctl enable --now kubelet
[root@server13 ~]# systemctl daemon-reload
[root@server13 ~]# systemctl restart docker
[root@server13 ~]# docker info#是systemd
Cgroup Driver: systemd
[root@server2 ~]# cd /etc/sysctl.d/
[root@server2 sysctl.d]# cat docker.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-arptables = 1
[root@server2 ~]# systemctl restart docker
#断掉server2，重连
[root@server2 ~]# kubeadm config print init-defaults 查看默认配置
[root@server2 ~]# kubeadm config images list --image-repository registry.aliyuncs.com/google_containers 列出所需镜像
[root@server2 ~]# kubeadm config images pull --image-repository registry.aliyuncs.com/google_containers 拉取镜像
[root@server2 ~]# kubeadm init --pod-network-cidr=10.244.0.0/16 --image-repository registry.aliyuncs.com/google_containers 初始化
[root@server2 sysctl.d]# mkdir -p $HOME/.kube
[root@server2 sysctl.d]# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@server2 sysctl.d]# chown $(id -u):$(id -g) $HOME/.kube/config
[root@server2 sysctl.d]# echo "source <(kubectl completion bash)" >> ~/.bashrc#命令补齐，重连生效
[root@server2 sysctl.d]# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
#直接拷贝也可以kube-flannel.yml
安装网络组件
查看节点
[root@server2 sysctl.d]# kubectl get pod --namespace kube-system
[root@server2 sysctl.d]# kubectl get node
[root@server2 sysctl.d]# docker save quay.io/coreos/flannel:v0.12.0-amd64 registry.aliyuncs.com/google_containers/pause:3.2 registry.aliyuncs.com/google_containers/coredns:1.7.0 registry.aliyuncs.com/google_containers/kube-proxy:v1.20.2 > node.tar
#导出node节点所需镜像并导入各节点
2.node端部署
%server3作为node端
[root@server3 yum.repos.d]# ls
docker-ce.repo dvd.repo redhat.repo
[root@server3 yum.repos.d]# vim dvd.repo
[root@server3 ~]# vim /etc/hosts#解析要改
[root@server3 ~]# cd docker-ce/
[root@server3 docker-ce]# ls
containerd.io-1.4.3-3.1.el7.x86_64.rpm
container-selinux-2.119.2-1.911c772.el7_8.noarch.rpm
docker-ce-20.10.2-3.el7.x86_64.rpm
docker-ce-cli-20.10.2-3.el7.x86_64.rpm
docker-ce-rootless-extras-20.10.2-3.el7.x86_64.rpm
fuse3-libs-3.6.1-4.el7.x86_64.rpm
fuse-overlayfs-0.7.2-6.el7_8.x86_64.rpm
repodata
slirp4netns-0.4.3-4.el7_8.x86_64.rpm
[root@server3 docker-ce]# yum install docker-ce docker-ce-cli
[root@server3 docker-ce]# systemctl start docker
[root@server3 docker]# systemctl enable docker
[root@server3 docker]# vim /etc/docker/daemon.json
{
"registry-mirrors": ["https://reg.westos.org"],
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2",
"storage-opts": [
"overlay2.override_kernel_check=true"
]
}
%拉取阿里云镜像，加快部署
[root@server3 docker]# vim /etc/yum.repos.d/k8s.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=0
# yum install -y kubelet kubeadm kubectl
# systemctl enable --now kubelet
[root@server3 ~]# systemctl daemon-reload
[root@server3 ~]# systemctl restart docker
[root@server3 ~]# docker info#是systemd
Cgroup Driver: systemd
[root@server3 ~]# cd /etc/sysctl.d/
[root@server3 sysctl.d]# cat docker.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-arptables = 1
[root@server3 ~]# systemctl restart docker
#断掉server2，重连
[root@server3 ~]# docker load -i node.tar
[root@server3 ~]# kubeadm join 172.25.0.2:6443 --token a55bse.7wbzxx70srbrr7ko --discovery-token-ca-cert-hash sha256:03b69cf689dc4cedfd52cd63167d06fdef69aa76d271b19428dd39fa254a0319
[root@server2 ~]# kubectl get nodes#有server2，3
[root@server2 sysctl.d]# kubectl get pod --namespace kube-system
二、pod管理
- pod是可以创建和管理k8s计算的最小可部署单元，一个pod代表着集群中运行的一个进程，每个pod都有唯一的ip
- 一个pod类似一个碗豆荚（资源共享），包含一个或多个容器（通常是docker），多个容器之间共享IPC、network和UTC namespace
- 官方手册：https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands
[root@server2 ~]# kubectl get pod -n kube-system #都要是running
kubectl get node
[root@server2 ~]# kubectl get pod
No resources found in default namespace.
[root@server2 ~]# kubectl get ns
NAME STATUS AGE
default Active 21d
kube-node-lease Active 21d
kube-public Active 21d
kube-system Active 21d
[root@server2 ~]# kubectl get pod -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-7f89b7bc75-pdw7l 0/1 Pending 0 21d
coredns-7f89b7bc75-r28lt 0/1 Pending 0 21d
etcd-server2 1/1 Running 1 21d
kube-apiserver-server2 1/1 Running 1 21d
kube-controller-manager-server2 1/1 Running 2 21d
kube-proxy-4vnhg 1/1 Running 1 21d
kube-proxy-tgbxj 1/1 Running 1 21d
kube-scheduler-server2 1/1 Running 1 21d
创建pod
[root@server2 ~]# kubectl run nginx --image=myapp:v1
kubectl run -h --help
[root@server2 ~]# kubectl get pod
[root@server2 ~]# kubectl get pod -n default
[root@server2 ~]# kubectl get pod
[root@server2 ~]# kubectl get pod -o wide#wide查看信息
[root@server2 ~]# curl 10.244.2.9#nginx的ip
[root@server2 ~]# kubectl run demo --image=busyboxplus -it
[root@server2 ~]# kubectl get pod
[root@server2 ~]# kubectl get pod -o wide
[root@server2 ~]# kubectl attach demo -it#demo是pod的名字，-c是pod内的哪个容器
/ #curl 10.244.2.9
[root@server2 ~]# kubectl delete pod nginx
[root@server2 ~]# kubectl log demo#查看那日志
[root@server2 ~]# kubectl create deployment -h
[root@server2 ~]# kubectl create deployment nginx --image=myapp:v1#通过控制器创建pod，可以创建多个
[root@server2 ~]# kubectl get all
[root@server2 ~]# kubectl delete pod nginx-67f9d9c97f-84tl4
[root@server2 ~]# kubectl get pod#控制器和rs没变，又重新创建了一个id
[root@server2 ~]# kubectl scale deployment --replicas=2 nginx #拉伸#有内部仓库会比较快
[root@server2 ~]# kubectl get pod
[root@server2 ~]# kubectl get pod -o wide
[root@server2 ~]# kubectl scale deployment --replicas=6 nginx#创建6个
[root@server2 ~]# kubectl scale deployment --replicas=3 nginx#创建3个，会优先删除运行时间少的
[root@server2 ~]# kubectl get pod -o wide
[root@server2 ~]# kubectl delete pod nginx-67f9d9c97f-gtb5m
[root@server2 ~]# kubectl get pod#删除一个之后，会自动添加一个，满足=3
%%%%对外暴露，能让用户访问，且是负载均衡的
[root@server2 ~]# kubectl expose deployment nginx --port=80#控制器deployment的nginx
[root@server2 ~]# kubectl get svc
[root@server2 ~]# curl 10.100.83.124#nginx的ip
[root@server2 ~]# curl 10.100.83.124/hostname.html#负载均衡
[root@server2 ~]# kubectl describe svc nginx#Endpoints有三个节点，是port的ip地址
[root@server2 ~]# kubectl get pod -o wide#看port的ip地址
[root@server2 ~]# kubectl describe svc nginx
[root@server2 ~]# curl 10.100.83.124#上一命令的ip
[root@server2 ~]# curl 10.100.83.124/hostname.html#负载均衡，还有健康检查机制，有挂了就去掉，新增的就添加
%暴露默认是集群内部，现在让集群外部也可以访问
[root@server2 ~]# kubectl edit svc nginx
修改：type:NodePort
[root@server2 ~]# kubectl get svc#已经改成NodePort
[root@zhenji]# curl 172.25.0.2:32208/hostname.html#32208动态ip，Nodeip:NodePort
[root@zhenji]# curl 172.25.0.3:32208/hostname.html
[root@zhenji]# curl 172.25.0.4:32208/hostname.html
%更新
[root@server2 ~]# kubectl set -h
[root@server2 ~]# kubectl set image -h
[root@server2 ~]# kubectl get all
[root@server2 ~]# kubectl get pod
[root@server2 ~]# kubectl describe pod nginx-67f9d9c97f-4qcbc#查看
[root@server2 ~]# kubectl set image deployment nginx myapp=myapp:v2#改变镜像为myapp:v2
[root@server2 ~]# kubectl rollout history deployment nginx#更新的历史记录
[root@server2 ~]# kubectl get pod#更新后rs名变了
[root@server2 ~]# kubectl rollout undo deployment nginx --to-revision=1#回滚到版本1
[root@server2 ~]# kubectl rollout history deployment nginx#查看历史版本
资源清单
[root@server2 ~]# kubectl delete svc nginx
[root@server2 ~]# kubectl delete deplouments.apps nginx
[root@server2 ~]# kubectl get all #释放资源
[root@server2 ~]# kubectl api-versions #查询命令
[root@server2 ~]# kubectl explain pod.apiVersion
[root@server2 ~]# kubectl explain pod.metadata
[root@server2 ~]# vim pod.yml
apiVersion: v1
kind: Pod#种类，资源类型
metadata:#元数据
name: nginx
namespace: default
spec:
containers:
- name: nginx
image: myapp:v1
imagePullPolicy: IfNotPresent
[root@server2 ~]# kubectl apply -f pod.yml #执行
[root@server2 ~]# kubectl get pod
[root@server2 ~]# kubectl describe pod nginx
#创建一个控制器
[root@server2 ~]# kubectl explain deployment
[root@server2 ~]# vim pod.yml
[root@server2 ~]# cat pod.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx
namespace: default
spec:
replicas: 3
selector:
matchLabels:
run: nginx
template:
metadata:
labels:
run: nginx
spec:
containers:
- name: nginx
image: myapp:v1
imagePullPolicy: IfNotPresent
[root@server2 ~]# kubectl apply -f pod.yml #执行
[root@server2 ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
demo 1/1 Running 0 128m 10.244.1.21 server3 <none> <none>
nginx 1/1 Running 0 63m 10.244.1.22 server3 <none> <none>
nginx-b5548c7c4-pg4ch 1/1 Running 0 45m 10.244.1.25 server3 <none> <none>
nginx-b5548c7c4-rjtb6 1/1 Running 0 45m 10.244.1.24 server3 <none> <none>
nginx-b5548c7c4-zp5l4 1/1 Running 0 45m 10.244.1.23 server3 <none> <none>
[root@server2 ~]# curl 10.244.1.24
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@server2 ~]# kubectl delete -f pod.yml
deployment.apps "nginx" deleted
[root@server2 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demo 1/1 Running 0 129m
nginx 1/1 Running 0 64m
[root@server2 ~]# kubectl get pod demo -o yaml#可以看
[root@server2 ~]# kubectl create deployment nginx --image=myapp:v1
[root@server2 ~]# kubectl get all
[root@server2 ~]# kubectl get deployments.apps nginx -o yaml#输出成yml格式，可以看作模板
[root@server2 ~]# kubectl delete deployments.apps nginx
[root@server2 ~]# kubectl apply -f pod.yml
[root@server2 ~]# kubectl get pod
[root@server2 ~]# kubectl get pod -o wide
[root@server2 ~]# curl 10.244.1.29
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
%%资源限制，最大限制limit，最小限制request
[root@server2 ~]# kubectl -n kube-system describe pod coredns-7f89b7bc75-8pg2s#看Requests:#控制cpu和内存
[root@server2 ~]# vim pod.yml
[root@server2 ~]# cat pod.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx
namespace: default
spec:
replicas: 3
selector:
matchLabels:
run: nginx
template:
metadata:
labels:
run: nginx
spec:
containers:
- name: nginx
image: myapp:v1
imagePullPolicy: IfNotPresent
resources:
requests:
cpu: 100m
memory: 100Mi#最少70Mi
[root@server2 ~]# kubectl apply -f pod.yml
deployment.apps/nginx configured
[root@server2 ~]# kubectl get pod
[root@server2 ~]# kubectl describe pod nginx-66f766df7c-gkd89#查看，一致
[root@server2 ~]# kubectl explain pod.spec.containers.resources#看limits <map[string]string>，控制cpu和内存
[root@server2 ~]# vim pod.yml
[root@server2 ~]# cat pod.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx
namespace: default
spec:
replicas: 3
selector:
matchLabels:
run: nginx
template:
metadata:
labels:
run: nginx
spec:
containers:
- name: nginx
image: myapp:v1
imagePullPolicy: IfNotPresent
resources:
requests:
cpu: 100m
memory: 100Mi#最少70Mi
limits:
cpu: 0.5
memory: 512Mi
[root@server2 ~]# kubectl apply -f pod.yml
[root@server2 ~]# kubectl get pod
[root@server2 ~]# kubectl describe pod nginx-79cc587f-qt7bt
Limits:
cpu: 500m
memory: 512Mi
Requests:
cpu: 100m
memory: 100Mi
[root@server2 ~]# kubectl get pod demo -o yaml|grep restart#自己默认会一直自启动
[root@server2 ~]# kubectl get nodes --show-labels #查看节点
NAME STATUS ROLES AGE VERSION LABELS
server2 Ready control-plane,master 22d v1.20.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=server2,kubernetes.io/os=linux,node-role.kubernetes.io/control-plane=,node-role.kubernetes.io/master=
server3 Ready <none> 22d v1.20.2 beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=server3,kubernetes.io/os=linux
[root@server2 ~]# vim pod.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx
namespace: default
spec:
replicas: 3#副本
selector:
matchLabels:
run: nginx#标签，自己定义的
template:
metadata:
labels:
run: nginx#和上面标签保持一致，所管理的标签
spec:
nodeSelector:#锁定节点
kubernetes.io/hostname: server3
#nodeName: server3#方法2，简单
hostNetwork: true
containers:
- name: nginx
image: myapp:v1
imagePullPolicy: IfNotPresent
resources:
requests:
cpu: 100m
memory: 100Mi
limits:
cpu: 0.5
memory: 512Mi
[root@server2 ~]# kubectl apply -f pod.yml #执行
nodeSelector:#锁定节点
kubernetes.io/hostname: server3
#nodeName: server3#方法2，简单
[root@server2 ~]# kubectl get pod -o wide#查看节点在server3上
[root@server2 ~]# docker pull game2048#是共有仓库中的，可以直接拉取。而私有仓库需要认证spec.nodeSelector
[root@server2 ~]# kubectl apply -f pod.yml #执行
hostNetwork: true
[root@zhenji]# curl 192.168.100.103
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@zhenji]# curl 192.168.100.103/hostname.html
server3
自主式清单编写，用于在同一个pod内创建多个容器
[root@server2 ~]# vim pod.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx
namespace: default
spec:
replicas: 3#副本
selector:
matchLabels:
run: nginx#标签，自己定义的
template:
metadata:
labels:
run: nginx#和上面标签保持一致，所管理的标签
spec:
#nodeSelector:#锁定节点
# kubernetes.io/hostname: server3
#nodeName: server3#方法2，简单
#hostNetwork: true
containers:
- name: nginx
image: myapp:v1
imagePullPolicy: IfNotPresent
resources:
requests:
cpu: 100m
memory: 100Mi
limits:
cpu: 0.5
memory: 512Mi
- name: busybox
image: busybox
imagePullPolicy: IfNotPresent
stdin: true
tty: true
添加 - name: busybox
image: busybox
imagePullPolicy: IfNotPresent
stdin: true
tty: true
[root@server2 ~]# kubectl get pod#2/2说明有两个容器
[root@server2 ~]# kubectl attach nginx-5f65b44d44-tlvpt -c busybox -it#-c指定容器busybox
[root@server2 ~]# kubectl logs nginx-5f65b44d44-tlvpt nginx #可以排错
[root@server2 ~]# kubectl describe pod nginx-5f65b44d44-tlvpt
[root@server2 ~]# vim pod.yml
注释 #- name: busybox
# image: busybox
# imagePullPolicy: IfNotPresent
# stdin: true
# tty: true
标签
[root@server2 ~]# kubectl label nodes server3 app=nginx#添加
[root@server2 ~]# kubectl get nodes server3 --show-labels
NAME STATUS ROLES AGE VERSION LABELS
server3 Ready <none> 22d v1.20.2 app=nginx,beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=server3,kubernetes.io/os=linux
[root@server2 ~]# kubectl label nodes server3 app=myapp#修改
error: 'app' already has a value (nginx), and --overwrite is false
[root@server2 ~]# kubectl label nodes server3 app=myapp --overwrite#overwrite覆盖
node/server3 labeled
[root@server2 ~]# kubectl get nodes server3 --show-labels
NAME STATUS ROLES AGE VERSION LABELS
server3 Ready <none> 22d v1.20.2 app=myapp,beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=server3,kubernetes.io/os=linux
[root@server2 ~]# kubectl label nodes server3 app-#删除
[root@server2 ~]# kubectl label pod demo run=demo2
error: 'run' already has a value (demo), and --overwrite is false
[root@server2 ~]# kubectl label pod demo run=demo2 --overwrite
pod/demo labeled
[root@server2 ~]# kubectl get pod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
demo 1/1 Running 2 3h24m run=demo2
[root@server2 ~]# kubectl get pod -l run#查看
[root@server2 ~]# kubectl get pod -L run
三、pod生命周期
%看kubernetes官方网站：https://kubernetes.io/docs/setup/，pod生命周期
#init容器不支持Readliness探针,one by one
#首先是容器环境初始化，初始化一个之后再初始化第二个…;再启动。。。
#init容器能做什么？
1.配置pods和容器
[root@server2 ~]# docker images
registry.aliyuncs.com/google_containers/pause#pod最基础的环境
[root@server2 ~]# vim live.yml
[root@server2 ~]# cat live.yml
apiVersion: v1
kind: Pod
metadata:
labels:
test: liveness
name: liveness-exec
spec:
containers:
- name: liveness
image: k8s.gcr.io/busybox
args:
- /bin/sh
- -c
- touch /tmp/healthy; sleep 30; rm -rf /tmp/healthy; sleep 600
livenessProbe:
exec:
command:
- cat
- /tmp/healthy
initialDelaySeconds: 5
periodSeconds: 5
[root@server2 ~]# kubectl create -f live.yml
pod/liveness-exec created
[root@server2 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demo 1/1 Running 2 3h51m
liveness-exec 1/1 Running 0 30s
[root@server2 ~]# kubectl describe pod liveness-exec#查看过程
[root@server2 ~]# kubectl get pod#restart次数会一直增加
NAME READY STATUS RESTARTS AGE
demo 1/1 Running 2 3h53m
liveness-exec 1/1 Running 1 2m5s
[root@server2 ~]# vim live.yml
[root@server2 ~]# cat live.yml
apiVersion: v1
kind: Pod
metadata:
labels:
test: liveness
name: liveness-exec
spec:
containers:
- name: liveness
image: myapp:v1
livenessProbe:
tcpSocket:
port: 80
initialDelaySeconds: 2
periodSeconds: 3
readinessProbe:
httpGet:
path: /hostname.html
port: 80
initialDelaySeconds: 3
periodSeconds: 3
[root@server2 ~]# kubectl delete -f live.yml
[root@server2 ~]# kubectl create -f live.yml
[root@server2 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demo 1/1 Running 2 4h1m
liveness-exec 1/1 Running 0 2m4s
#path: /hostname.html的路径存在时liveness-exec 1/1才会生效
#内部默认检测的是8080端口，需要说明port: 80，不然会一致重启寻找8080
2.init容器
%官方init文档:https://kubernetes.io/zh/docs/concepts/workloads/pods/init-containers/
[root@server2 ~]# vim service.yml
[root@server2 ~]# cat service.yml
---
apiVersion: v1
kind: Service
metadata:
name: myservice
spec:
ports:
- protocol: TCP
port: 80
targetPort: 80
---
[root@server2 ~]# mv init.yml service.yml
[root@server2 ~]# kubectl create -f service.yml
[root@server2 ~]# kubectl describe svc myservice
Name: myservice
Namespace: default
Labels: <none>
Annotations: <none>
Selector: <none>
Type: ClusterIP
IP Families: <none>
IP: 10.106.68.120
IPs: 10.106.68.120
Port: <unset> 80/TCP
TargetPort: 80/TCP
Endpoints: <none>
Session Affinity: None
Events: <none>
[root@server2 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demo 1/1 Running 4 14h
liveness-exec 1/1 Running 0 10h
[root@server2 ~]# kubectl attach demo -it
Defaulting container name to demo.
Use 'kubectl describe pod/demo -n default' to see all of the containers in this pod.
If you don't see a command prompt, try pressing enter.
/ # nslookup myservice#能解析到
[root@server2 ~]# vim init.yml
[root@server2 ~]# cat init.yml
apiVersion: v1
kind: Pod
metadata:
name: myapp-pod
labels:
app: myapp
spec:
containers:
- name: myapp-container
image: myapp:v1
initContainers:
- name: init-myservice
image: busybox
command: ['sh', '-c', "until nslookup myservice.default.svc.cluster.local; do echo waiting for myservice; sleep 2; done"]
[root@server2 ~]# kubectl delete -f service.yml
[root@server2 ~]# kubectl create -f init.yml#初始化容器
[root@server2 ~]# kubectl get pod
[root@server2 ~]# kubectl logs myapp-pod init-myservice#日志会报错#没有得到相应的解析，会一直在作解析
[root@server2 ~]# kubectl create -f service.yml
[root@server2 ~]# kubectl get pod#此时解析到了myservice
[root@server2 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demo 1/1 Running 7 15h
liveness-exec 1/1 Running 0 11h
myapp-pod 0/1 Init:0/1 0 7m55s
[root@server2 ~]# kubectl delete -f service.yml
service "myservice" deleted
[root@server2 ~]# kubectl delete -f init.yml
四、控制器管理pod
1.ReplicaSet rs控制器部署
%官方:https://kubernetes.io/zh/docs/concepts/workloads/controllers/replicaset/
[root@server2 ~]# cat rs.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: deployment
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: myapp:v1
[root@server2 ~]# kubectl apply -f rs.yml
deployment.apps/deployment created
[root@server2 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demo 1/1 Running 8 16h
deployment-6456d7c676-4zq72 1/1 Running 0 26s
deployment-6456d7c676-8cn4q 1/1 Running 0 26s
deployment-6456d7c676-g77z8 1/1 Running 0 26s
liveness-exec 1/1 Running 1 12h
[root@server2 ~]# kubectl get rs
NAME DESIRED CURRENT READY AGE
deployment-6456d7c676 3 3 3 32s
[root@server2 ~]# vim rs.yml #replicas: 6
[root@server2 ~]# kubectl apply -f rs.yml
[root@server2 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
demo 1/1 Running 8 16h
deployment-6456d7c676-2zlmx 1/1 Running 0 26s
deployment-6456d7c676-67tzx 1/1 Running 0 26s
deployment-6456d7c676-8cn4q 0/1 Terminating 0 4m14s
deployment-6456d7c676-dj45h 1/1 Running 0 26s
deployment-6456d7c676-g77z8 0/1 Terminating 0 4m14s
deployment-6456d7c676-m8sr7 1/1 Running 0 26s
deployment-6456d7c676-m8vmm 1/1 Running 0 26s
deployment-6456d7c676-rwdjr 0/1 Terminating 0 54s
deployment-6456d7c676-ss62r 1/1 Running 0 26s
liveness-exec 1/1 Running 1 12h
[root@server2 ~]# kubectl get rs
NAME DESIRED CURRENT READY AGE
deployment-6456d7c676 6 6 6 99s
[root@server2 ~]# kubectl get pod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
demo 1/1 Running 8 16h run=demo2
deployment-6456d7c676-2zlmx 1/1 Running 0 4m10s app=nginx,pod-template-hash=6456d7c676
deployment-6456d7c676-m8vmm 1/1 Running 0 4m10s app=nginx,pod-template-hash=6456d7c676
deployment-6456d7c676-ss62r 1/1 Running 0 4m10s app=nginx,pod-template-hash=6456d7c676
liveness-exec 1/1 Running 1 12h test=liveness
[root@server2 ~]# kubectl label pod deployment-6456d7c676-2zlmx app=myapp
error: 'app' already has a value (nginx), and --overwrite is false
[root@server2 ~]# kubectl label pod deployment-6456d7c676-2zlmx app=myapp --overwrite
[root@server2 ~]# kubectl get pod -L app#有四个，多了个myapp，有一个nginx是新建的，通过标签匹配的，没有3个nginx，就会新建1个，满足3个nginx
NAME READY STATUS RESTARTS AGE APP
demo 1/1 Running 8 16h
deployment-6456d7c676-2zlmx 1/1 Running 0 7m33s myapp
deployment-6456d7c676-hjpvm 1/1 Running 0 43s nginx
deployment-6456d7c676-m8vmm 1/1 Running 0 7m33s nginx
deployment-6456d7c676-ss62r 1/1 Running 0 7m33s nginx
liveness-exec 1/1 Running 1 12h
[root@server2 ~]# vim rs.yml
image: myapp:v2
[root@server2 ~]# kubectl apply -f rs.yml
deployment.apps/deployment configured
[root@server2 ~]# kubectl get pod -L app#3个nginx会滚动更新，是根据标签匹配pod的。标签改了myapp就不受控制
[root@server2 ~]# kubectl delete pod deployment-6456d7c676-2zlmx#可以删除myapp
[root@server2 ~]# kubectl get rs#把原来v1的rs回收，再新建一个v2
NAME DESIRED CURRENT READY AGE
deployment-6456d7c676 0 0 0 12m
deployment-6d4f5bf58f 3 3 3 2m32s
[root@server2 ~]# vim rs.yml
image: myapp:v1
[root@server2 ~]# kubectl apply -f rs.yml
[root@server2 ~]# kubectl get rs#rs又回到了v1
NAME DESIRED CURRENT READY AGE
deployment-6456d7c676 3 3 3 13m
deployment-6d4f5bf58f 0 0 0 3m24s
[root@server2 ~]# kubectl expose deployment deployment --port=80#暴露端口
service/deployment exposed
[root@server2 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
deployment ClusterIP 10.98.179.252 <none> 80/TCP 4s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22d
[root@server2 ~]# kubectl describe svc deployment
Selector: app=nginx#标签
[root@server2 ~]# kubectl get svc deployment -o yaml
selector:
app: nginx
[root@server2 ~]# kubectl label pod deployment-6456d7c676-cpxzp app=myapp
error: 'app' already has a value (nginx), and --overwrite is false
[root@server2 ~]# kubectl label pod deployment-6456d7c676-cpxzp app=myapp --overwrite
pod/deployment-6456d7c676-cpxzp labeled
[root@server2 ~]# kubectl get pod -L app
NAME READY STATUS RESTARTS AGE APP
demo 1/1 Running 8 17h
deployment-6456d7c676-cpxzp 1/1 Running 0 58m myapp
deployment-6456d7c676-mdf5g 1/1 Running 0 12s nginx
deployment-6456d7c676-q9gd4 1/1 Running 0 59m nginx
deployment-6456d7c676-zx7gq 1/1 Running 0 58m nginx
liveness-exec 1/1 Running 1 13h
[root@server2 ~]# kubectl describe svc deployment
Endpoints: 10.244.1.67:80,10.244.1.69:80,10.244.1.70:80#还是3个，myapp不在
[root@server2 ~]# kubectl get pod -o wide
[root@server2 ~]# kubectl edit svc deployment
app: myapp
service/deployment edited
[root@server2 ~]# kubectl describe svc deployment#根据标签识别
Endpoints: 10.244.1.68:80
[root@server2 ~]# kubectl delete -f rs.yml
deployment.apps "deployment" deleted
[root@server2 ~]# kubectl delete svc deployment
[root@server2 ~]# kubectl get all
[root@server2 ~]# kubectl delete pod/deployment-6456d7c676-cpxzp#myapp需要手工删除
2.daemonset控制器
[root@server2 ~]# cat daemonset.yml
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: daemonset-example
labels:
k8s-app: zabbix-agent
spec:
selector:
matchLabels:
name: zabbix-agent
template:
metadata:
labels:
name: zabbix-agent
spec:
containers:
- name: zabbix-agent
image: zabbix-agent
[root@server1 ~]# docker pull zabbix/zabbix-agent
[root@server1 ~]# docker tag zabbix/zabbix-agent:latest reg.westos.org/library/zabbix-agent:latest
[root@server1 ~]# docker push reg.westos.org/library/zabbix-agent:latest
[root@server2 ~]# kubectl apply -f daemonset.yml
[root@server2 ~]# kubectl get pod#每个节点一个，会自动分配每个节点一个
[root@server2 ~]# kubectl delete -f daemonset.yml
3.job
[root@server2 ~]# cat job.yml
apiVersion: batch/v1
kind: Job
metadata:
name: pi
spec:
template:
spec:
containers:
- name: pi
image: perl
command: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"]
restartPolicy: Never
backoffLimit: 4
[root@server1 ~]# docker pull perl
[root@server1 ~]# docker tag perl:latest reg.westos.org/library/perl:latest
[root@server1 ~]# docker push reg.westos.org/library/perl:latest
[root@server2 ~]# kubectl delete -f daemonset.yml
[root@server2 ~]# kubectl create -f daemonset.yml
[root@server2 ~]# kubectl get pod#用于批量计算，一次性的
[root@server2 ~]# kubectl delete -f daemonset.yml
4.cronjob
[root@server2 ~]# cat cronjob.yml
apiVersion: batch/v1beta1
kind: CronJob
metadata:
name: hello
spec:
schedule: "*/1 * * * *"
jobTemplate:
spec:
template:
spec:
containers:
- name: hello
image: busyboxplus
imagePullPolicy: IfNotPresent
args:
- /bin/sh
- -c
- date; echo Hello from the Kubernetes cluster
restartPolicy: OnFailure
[root@server2 ~]# kubectl create -f daemonset.yml
[root@server2 ~]# kubectl get all
[root@server2 ~]# kubectl get pod#用于批量计算，周期性的，每分钟一次
[root@server2 ~]# kubectl logs hello
[root@server2 ~]# kubectl delete -f daemonset.yml
五、Service
1.k8s网络通信,面试，主要问通信的原理
k8s通过CNI接口接入其他插件来实现网络通讯。目前比较流行的插件有flannel，calico等。
CNI插件存放位置：# cat /etc/cni/net.d/10-flannel.conflist
插件使用的解决方案如下：
虚拟网桥，虚拟网卡，多个容器共用一个虚拟网卡进行通信。
多路复用：MacVLAN，多个容器共用一个物理网卡进行通信。
硬件交换：SR-LOV，一个物理网卡可以虚拟出多个接口，这个性能最好。
容器间通信：同一个pod内的多个容器间的通信，通过lo即可实现；
pod之间的通信：
同一节点的pod之间通过cni网桥转发数据包。
不同节点的pod之间的通信需要网络插件支持。
pod和service通信: 通过iptables或ipvs实现通信，ipvs取代不了iptables，因为ipvs只能做负载均衡，而做不了nat转换。
pod和外网通信：iptables的MASQUERADE。
Service与集群外部客户端的通信；（ingress、nodeport、loadbalancer）
%开启kube-proxy的ipvs模式
[root@server3 ~]# yum install -y ipvsadm #server3节点，所有节点安装
[root@server2 ~]# yum install -y ipvsadm
[root@server2 ~]# kubectl edit cm kube-proxy -n kube-system #修改ipvs模式
mode: "ipvs"
[root@server2 ~]# kubectl get pod -n kube-system |grep kube-proxy
kube-proxy-4vnhg 1/1 Running 5 22d
kube-proxy-tgbxj 1/1 Running 4 22d
[root@server2 ~]# kubectl get pod -n kube-system |grep kube-proxy | awk '{system("kubectl delete pod "$1" -n kube-system")}'#更新kube-proxy pod
[root@server2 ~]# kubectl get pod -n kube-system |grep kube-proxy#以更新
kube-proxy-h5qvh 1/1 Running 0 27s
kube-proxy-ltvsm 1/1 Running 0 93s
[root@server2 ~]# kubectl expose deployment deployment --port=80
[root@server2 ~]# ipvsadm -ln
[root@server2 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
deployment ClusterIP 10.106.11.177 <none> 80/TCP 4s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22d
[root@server2 ~]# vim rs.yml #=6,LVS就会有6个ipvsadm -nl看
[root@server2 ~]# ipvsadm -ln
#负载均衡
[root@server2 ~]# curl 10.106.11.177
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@server2 ~]# curl 10.106.11.177/hostname.html
[root@server2 ~]# ip addr #ipvs模式会创建一个虚拟网卡kube-ipvs0，并分配service IP
[root@server2 ~]# vim demo.yml
[root@server2 ~]# cat demo.yml
---
apiVersion: v1
kind: Service
metadata:
name: myservice
spec:
selector:
app: myapp
ports:
- protocol: TCP
port: 80
targetPort: 80
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: demo2
spec:
replicas: 3
selector:
matchLabels:
app: myapp
template:
metadata:
labels:
app: myapp
spec:
containers:
- name: myapp
image: myapp:v2
[root@server2 ~]# kubectl apply -f demo.yml
service/myservice created
deployment.apps/demo2 created
[root@server2 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
deployment ClusterIP 10.106.11.177 <none> 80/TCP 5m42s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22d
myservice ClusterIP 10.104.195.38 <none> 80/TCP 17s
[root@server2 ~]# kubectl describe svc deployment
IP: 10.106.11.177
Endpoints: 10.244.1.73:80,10.244.1.74:80,10.244.1.75:80 + 3 more...
[root@server2 ~]# ipvsadm -ln看有相应的ip10.106.11.177
[root@server2 ~]# cd /etc/cni/net.d/#配置文件的位置
[root@server2 net.d]# ls
10-flannel.conflist
[root@server2 net.d]# ps ax|grep flanneld#进程flannel
3448 pts/0 S+ 0:00 grep --color=auto f lanneld
6023 ? Ssl 0:08 /opt/bin/flanneld --ip-masq --kube-subnet-mgr
[root@server2 net.d]# cd /run/flannel/
[root@server2 flannel]# ls
subnet.env
[root@server2 flannel]# cat subnet.env
FLANNEL_NETWORK=10.244.0.0/16
FLANNEL_SUBNET=10.244.0.1/24
FLANNEL_MTU=1450
FLANNEL_IPMASQ=true
[root@server2 flannel]# ip addr#flannel的地址会分到ip addr上的flannel1上
[root@server2 flannel]# ip n#都有缓存
192.168.100.103 dev eth0 lladdr 52:54:00:c7:72:f8 REACHABLE
192.168.100.1 dev eth0 lladdr f8:6e:ee:cb:df:75 STALE
169.254.169.254 dev eth0 FAILED
10.244.1.0 dev flannel.1 lladdr ea:85:e2:25:4e:bc PERMANENT
192.168.100.141 dev eth0 lladdr d0:bf:9c:82:8b:f4 REACHABLE
fe80::1 dev eth0 lladdr f8:6e:ee:cb:df:75 router STALE
2.Service的几种服务方式
1）无头服务，不需要ip,直接用域名解析myservice.default.svc.cluster.local
[root@server2 ~]# kubectl delete -f demo.yml
service "myservice" deleted
deployment.apps "demo2" deleted
[root@server2 ~]# vim demo.yml
clusterIP: None
[root@server2 ~]# kubectl apply -f demo.yml
[root@server2 ~]# kubectl get svc#没有地址
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
deployment ClusterIP 10.106.11.177 <none> 80/TCP 25m
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22d
myservice ClusterIP None <none> 80/TCP 35s
[root@server2 ~]# kubectl delete -f rs.yml #kubeclt delete 没用的
deployment.apps "deployment" deleted
[root@server2 ~]# kubectl delete svc deployment
[root@server2 ~]# kubectl describe svc myservice#有points
Endpoints: 10.244.1.82:80,10.244.1.83:80,10.244.1.84:80
[root@server2 ~]# dig myservice.default.svc.cluster.local. @10.96.0.10
[root@server2 ~]# kubectl apply -f demo.yml
[root@server2 ~]# kubectl attach demo -it
/ # nslookup myservice#可以看到解析
[root@server2 ~]# vvim demo.yml #拉伸到6个
[root@server2 ~]# kubectl apply -f demo.yml
[root@server2 ~]# kubectl attach demo -it
/ # nslookup myservice#可以看到解析有6个
[root@server2 ~]# rpm -qf /usr/bin/dig
bind-utils-9.9.4-72.el7.x86_64
[root@server2 ~]# dig -t A myservice.default.svc.cluster.local. @10.96.0.10
[root@server2 ~]# dig -t A kube-dns.kube-system.svc.cluster.local. @10.96.0.10
[root@server2 ~]# kubectl delete -f demo.yml
[root@server2 ~]# vim demo.yml
#clusterIP: None
type: NodePort
[root@server2 ~]# kubectl apply -f demo.yml
[root@server2 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22d
myservice NodePort 10.108.105.69 <none> 80:30183/TCP 88s
[root@server2 ~]# ipvsadm -ln
[root@server2 ~]# kubectl describe svc myservice
#负载均衡
[root@zhenji file_recv]# curl 192.168.100.102:30183
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
[root@zhenji file_recv]# curl 192.168.100.102:30183/hostname.html
2）2种方式，指定一个LoadBalancer类型的service
[root@server2 ~]# vim demo.yml
type:LoadBalancer
[root@server2 ~]# kubectl delete svc myservice
[root@server2 ~]# kubectl apply -f demo.yml
[root@server2 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22d
myservice LoadBalancer 10.101.253.48 <pending> 80:32697/TCP 7s
[root@server2 ~]# ipvsadm -ln
[root@server2 ~]# kubectl describe svc myservice
3）3种方式，自己分地址
[root@server2 ~]# vim demo.yml
#type: LoadBalancer
externalIPs:
- 192.168.100.200
[root@server2 ~]# kubectl apply -f demo.yml
service/myservice configured
deployment.apps/demo2 unchanged
[root@server2 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22d
myservice ClusterIP 10.101.253.48 192.168.100.200 80/TCP 2m36s
[root@zhenji file_recv]# curl 192.168.100.200
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
[root@zhenji file_recv]# curl 192.168.100.200/hostname.html
demo2-67f8c948cf-mwv88
[root@zhenji file_recv]# curl 192.168.100.200/hostname.html
4）4种方式，ExternalName,内部访问外部
[root@server2 ~]# vim exsvc.yml
apiVersion: v1
kind: Service
metadata:
name: exsvc
spec:
type: ExternalName
externalName: www.westos.org
[root@server2 ~]# kubectl apply -f demo.yml
service/myservice configured
deployment.apps/demo2 unchanged
[root@server2 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22d
myservice ClusterIP 10.101.253.48 192.168.100.200 80/TCP 2m36s
[root@server2 ~]# vim exsvc.yml
[root@server2 ~]# kubectl apply -f exsvc.yml
service/exsvc created
[root@server2 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
exsvc ExternalName <none> www.westos.org <none> 5s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22d
myservice ClusterIP 10.101.253.48 192.168.100.200 80/TCP 5m18s
[root@server2 ~]# kubectl attach demo -it
/ # nslookup exsvc
[root@server2 ~]# dig -t A exsvc.default.svc.cluster.local. @10.96.0.10
[root@server2 ~]# vim exsvc.yml
externalName: www.baidu.org
[root@server2 ~]# kubectl apply -f exsvc.yml
service/exsvc configured
[root@server2 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
exsvc ExternalName <none> www.baidu.org <none> 3m7s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22d
myservice ClusterIP 10.101.253.48 192.168.100.200 80/TCP 8m20s
[root@server2 ~]# dig -t A exsvc.default.svc.cluster.local. @10.96.0.10 #集群内部不变，只有外部的解析变了
5）适用于公有云上的 Kubernetes 服务
%metallb安装
%%%官网 ：https://metallb.universe.tf/installation/
[root@server2 ~]# kubectl edit configmap -n kube-system kube-proxy
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: "ipvs"
ipvs:
strictARP: true#改成true
[root@server2 ~]# kubectl get pod -n kube-system |grep kube-proxy | awk '{system("kubectl delete pod "$1" -n kube-system")}'#更新kube-proxy pod
wget 两个
[root@server2 ~]# mkdir metallb
[root@server2 ~]# cd metallb
[root@server2 metallb]# wget https://raw.githubusercontent.com/metallb/metallb/v0.9.5/manifests/namespace.yaml
[root@server2 metallb]# wget https://raw.githubusercontent.com/metallb/metallb/v0.9.5/manifests/metallb.yaml
[root@server2 metallb]# cat metallb.yaml#看下载的镜像
%pull两个镜像
[root@server1 ~]# docker pull metallb/controller:v0.9.5
[root@server1 ~]# docker pull metallb/speaker:v0.9.5
[root@server2 metallb]# kubectl apply -f metallb.yaml
[root@server2 metallb]# kubectl apply -f namespace.yaml
[root@server2 metallb]# kubectl create secret generic -n metallb-system memberlist --from-literal=secretkey="$(openssl rand -base64 128)"#创建地址池，第一次创建的时候需要执行，以后不用
[root@server2 metallb]# kubectl -n metallb-system get all
[root@server2 metallb]# kubectl -n metallb-system get service
[root@server2 metallb]# kubectl -n metallb-system get secrets
[root@server2 metallb]# kubectl -n llb-system get pod#running
[root@server2 metallb]# vim config.yaml
[root@server2 metallb]# cat config.yaml
apiVersion: v1
kind: ConfigMap
metadata:
namespace: metallb-system
name: config
data:
config: |
address-pools:
- name: default
protocol: layer2
addresses:
- 172.25.0.100-172.25.0.200#自己的网段
[root@server2 metallb]# kubectl apply -f config.yaml
[root@server2 metallb]# cp /root/ingress/nginx-svc.yml .
[root@server2 metallb]# vim nginx-svc.yml
[root@server2 metallb]# cat nginx-svc.yml
---
apiVersion: v1
kind: Service
metadata:
name: nginx-svc
spec:
selector:
app: nginx
ports:
- protocol: TCP
port: 80
targetPort: 80
type: LoadBalancer
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: deployment
spec:
replicas: 2
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: myapp:v1
[root@server2 metallb]# kubectl apply -f nginx-svc.yml
[root@server2 metallb]# kubectl get svc#有nginx-svc的EXTERNAL-IP是指定网段172.25.0.100-172.25.0.200中的172.25.0.100
[root@server2 metallb]# cul 10.111.151.57#nginx-svc的CLUSTER-IP，通的
[root@server2 metallb]# kubectl get pod#running
[root@zhenji Desktop]# curl 172.25.0.100
[root@zhenji Desktop]# curl 172.25.0.100/hostname.html#负载均衡
[root@server2 metallb]# cp nginx-svc.yml demo-svc.yml
[root@server2 metallb]# vim demo-svc.yml
---
apiVersion: v1
kind: Service
metadata:
name: demo-svc
spec:
selector:
app: demo
ports:
- protocol: TCP
port: 80
targetPort: 80
type: LoadBalancer
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: demo
spec:
replicas: 2
selector:
matchLabels:
app: demo
template:
metadata:
labels:
app: demo
spec:
containers:
- name: demo
image: myapp:v2
:%s/nginx/demo/g
[root@server2 metallb]# kubectl apply -f demo-svc.yml
[root@server2 metallb]# kubectl get pod#running
[root@server2 metallb]# kubectl get svc#172.25.0.101
[root@zhenji Desktop]# curl 172.25.0.101#v2
[root@zhenji Desktop]# curl 172.25.0.100#v1
[root@server2 metallb]# kubectl -n metallb-system describe cm config#Name:config,表示搭建成功
[root@server2 metallb]# kubectl -n ingress-nginx get all
[root@server2 metallb]# kubectl -n get ingress-nginx delete daemosets.apps ingress-ginx-controller#补齐
[root@server2 ingress]# cp nginx.yml demo.yml
[root@server2 ingress]# cat demo.yml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-demo
spec:
#tls:
# - hosts:
# - www1.westos.org
# secretName: tls-secret
rules:
- host: www1.westos.org
http:
paths:
- path: /
backend:
serviceName: nginx-svc
servicePort: 80
[root@server2 ingress]# kubectl apply -f demo.yml
[root@server2 ingress]# describ ingress ingress-demo
#user->vip->ingress->service->pod
[root@server2 ingress]# apply -f nginx-svc.yml
[root@zhenji Desktop]# curl www1.westos.org#通
[root@zhenji Desktop]# curl www1.westos.org/hostname.yml
[root@server2 ingress]# vim demo.yml #看证书
[root@server2 ingress]# cat demo.yml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-demo
spec:
tls:
- hosts:
- www1.westos.org
secretName: tls-secret
rules:
- host: www1.westos.org
http:
paths:
- path: /
backend:
serviceName: nginx-svc
servicePort: 80
[root@server2 ingress]# apply -f demo.yml
#证书时默认的，要改证书,删除，新生成一个证书
[root@server2 ingress]# rm -fr tls.*
[root@server2 ingress]# openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=www1.westos.org/O=www1.westos.org"
[root@server2 ingress]# kubectl delete secrets tls-secret
[root@server2 ingress]# kubectl create secret tls tls-secret --key tls.key --cert tls.crt
[root@server2 ingress]# delete -f demo.yml
[root@server2 ingress]# apply -f demo.yml
[root@server2 ingress]# kubectl -n namespace logs pod #看日志
[root@zhenji Desktop]# curl www1.westos.org -I
网页访问www1.westos.org
#请求链路：client->vip(metallb)->ingress-nginx->nginx-svc->pod
六、flannel网络
- flannel vxlan跨主机通信原理，面试问怎么通信的
VXLAN，即Virtual Extensible LAN（虚拟可扩展局域网），是Linux本身支持的一网种网络虚拟化技术。VXLAN可以完全在内核态实现封装和解封装工作，从而通过“隧道”机制，构建出覆盖网络（Overlay Network）。
VTEP：VXLAN Tunnel End Point（虚拟隧道端点），在Flannel中 VNI的默认值是1，这也是为什么宿主机的VTEP设备都叫flannel.1的原因。
Cni0: 网桥设备，每创建一个pod都会创建一对 veth pair。其中一端是pod中的eth0，另一端是Cni0网桥中的端口（网卡）。
Flannel.1: TUN设备(虚拟网卡)，用来进行 vxlan 报文的处理（封包和解包）。不同node之间的pod数据流量都从overlay设备以隧道的形式发送到对端。
Flanneld：flannel在每个主机中运行flanneld作为agent，它会为所在主机从集群的网络地址空间中，获取一个小的网段subnet，本主机内所有容器的IP地址都将从中分配。同时Flanneld监听K8s集群数据库，为flannel.1设备提供封装数据时必要的mac、ip等网络数据信息。
当容器发送IP包，通过veth pair 发往cni网桥，再路由到本机的flannel.1设备进行处理。
VTEP设备之间通过二层数据帧进行通信，源VTEP设备收到原始IP包后，在上面加上一个目的MAC地址，封装成一个内部数据帧，发送给目的VTEP设备。
内部数据桢，并不能在宿主机的二层网络传输，Linux内核还需要把它进一步封装成为宿主机的一个普通的数据帧，承载着内部数据帧通过宿主机的eth0进行传输。
Linux会在内部数据帧前面，加上一个VXLAN头，VXLAN头里有一个重要的标志叫VNI，它是VTEP识别某个数据桢是不是应该归自己处理的重要标识。
flannel.1设备只知道另一端flannel.1设备的MAC地址，却不知道对应的宿主机地址是什么。在linux内核里面，网络设备进行转发的依据，来自FDB的转发数据库，这个flannel.1网桥对应的FDB信息，是由flanneld进程维护的。
linux内核在IP包前面再加上二层数据帧头，把目标节点的MAC地址填进去，MAC地址从宿主机的ARP表获取。
此时flannel.1设备就可以把这个数据帧从eth0发出去，再经过宿主机网络来到目标节点的eth0设备。目标主机内核网络栈会发现这个数据帧有VXLAN Header，并且VNI为1，Linux内核会对它进行拆包，拿到内部数据帧，根据VNI的值，交给本机flannel.1设备处理,flannel.1拆包，根据路由表发往cni网桥，最后到达目标容器。
[root@server2 ~]# kubectl get pod -o wide#应该有server3和server4两个不同网段
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
demo 1/1 Running 11 19h 10.244.1.50 server3 <none> <none>
demo2-67f8c948cf-bgjnt 1/1 Running 0 75m 10.244.1.87 server3 <none> <none>
demo2-67f8c948cf-wrpz2 1/1 Running 0 75m 10.244.1.86 server3 <none> <none>
liveness-exec 1/1 Running 1 15h 10.244.1.48 server3 <none> <none>
[root@server2 ~]# kubectl attach demo -it
Defaulting container name to demo.
Use 'kubectl describe pod/demo -n default' to see all of the containers in this pod.
If you don't see a command prompt, try pressing enter.
/ # ping 10.244.1.86
PING 10.244.1.86 (10.244.1.86): 56 data bytes
64 bytes from 10.244.1.86: seq=0 ttl=64 time=12.373 ms
64 bytes from 10.244.1.86: seq=1 ttl=64 time=0.085 ms
源地址-》目标地址 mack地址
[root@server3 ~]# arp -n
[root@server2 ~]# kubectl attach demo -it
Defaulting container name to demo.
Use 'kubectl describe pod/demo -n default' to see all of the containers in this pod.
If you don't see a command prompt, try pressing enter.
/ # ip addr show eth0
3: eth0@if9: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1450 qdisc noqueue
link/ether ee:32:aa:6d:60:18 brd ff:ff:ff:ff:ff:ff
inet 10.244.1.50/24 brd 10.244.1.255 scope global eth0
valid_lft forever preferred_lft forever
/ # ping 10.244.1.50
PING 10.244.1.50 (10.244.1.50): 56 data bytes
64 bytes from 10.244.1.50: seq=0 ttl=64 time=0.170 ms
64 bytes from 10.244.1.50: seq=1 ttl=64 time=0.057 ms
flannel支持多种后端:Vxlan、host-gw（不支持跨网段）、UDP(性能差)
[root@server2 ~]# kubectl -n kube-system edit cm kube-flannel-cfg
改Type:"host-gw"
[root@server2 ~]# kubectl -n kube-system get pod
[root@server2 ~]# kubectl get pod -n kube-system |grep flannel | awk '{system("kubectl delete pod "$1" -n kube-system")}'#更新生效
[root@server2 ~]# kubectl -n kube-system get pod
[root@server2 ~]# kubectl attach demo -it#ping的通
/ # ip addr show eth0
3: eth0@if9: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1450 qdisc noqueue
link/ether ee:32:aa:6d:60:18 brd ff:ff:ff:ff:ff:ff
inet 10.244.1.50/24 brd 10.244.1.255 scope global eth0
valid_lft forever preferred_lft forever
/ # ping 10.244.1.50
PING 10.244.1.50 (10.244.1.50): 56 data bytes
64 bytes from 10.244.1.50: seq=0 ttl=64 time=0.204 ms
64 bytes from 10.244.1.50: seq=1 ttl=64 time=0.063 ms
[root@server4 ~]# route -n #主机网关模式，每个节点都有
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.100.1 0.0.0.0 UG 0 0 0 eth0
10.244.0.0 192.168.100.102 255.255.255.0 UG 0 0 0 eth0
[root@server3 ~]# tcpdump -i eth0 -nn host 172.25.0.4
[root@server3 ~]# kubectl -n kube-system edit cm kube-fannel-cfg
改type: "vxlan",
"Directrouting": True#如果是同网段的使用路由模式，不同网段用vxlan
[root@server2 ~]# kubectl get pod -n kube-system |grep fannel | awk '{system("kubectl delete pod "$1" -n kube-system")}'#更新生效
[root@server2 ~]# kubectl get pod -n kube-system
route -n #
server3上抓包
tcpdump -i eth0 -nn host 172.25.0.4
tcpdump -i flannel.1 -nn#没有，说明没有经过他
#只解决网络通信，不解决网络策略
七、ingress服务
%%kubernetes官方网站：https://kubernetes.io/docs/setup/production-environment/container-runtimes/#docker
1.部署ingress服务
[root@server2 ~]# vim demo.yml
#clusterIP: None
#type: LoadBalancer
#externalIPs:
#- 192.168.100.200
[root@server2 ~]# kubectl apply -f demo.yml
https://kubernetes.github.io/ingress-nginx/deploy/#bare-metal
#server1上部署私有仓库，因为不知道master会部署到哪个节点上
[root@server1 ~]# docker load -i ingress-nginx.tar
[root@server1 ~]# docker images | grep ingress
[root@server1 ~]# docker tag quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.33.0 reg.westos.org/library/nginx-ingress-controller:0.33.0
[root@server1 ~]# docker images | grep webhook
[root@server1 ~]# docker tag jettech/kube-webhook-certgen:v1.2.0 reg.westos.org/library/kube-webhook-certgen:v1.2.0
[root@server1 ~]# docker push reg.westos.org/library/nginx-ingress-controller:0.33.0
[root@server1 ~]# docker login reg.westos.org
[root@server1 harbor]# docker push reg.westos.org/library/kube-webhook-certgen:v1.2.0
#官方文档，wget下来
[root@server2 ]# mkdir ingress
[root@server2 ~]# cd ingress/
[root@server2 ingress]# ls
deploy.yaml
[root@server2 ingress]# kubectl apply -f deploy.yaml
[root@server2 ingress]# kubectl get ns
ingress-nginx Active 12s
[root@server2 ingress]# kubectl get all -n ingress-nginx
[root@server2 ingress]# kubectl get pod -o wide -n ingress-nginx
[root@server2 ingress]# kubectl logs -n ingress-nginx ingress-nginx-controller-mbpql#排错
[root@server2 ingress]# kubectl -n ingress-nginx get pod
NAME READY STATUS RESTARTS AGE
ingress-nginx-admission-create-f6g7k 0/1 Completed 0 26h
ingress-nginx-admission-patch-g2sbs 0/1 Completed 0 26h
ingress-nginx-controller-47b2l 0/1 Running 0 6s
2.使用ingress服务
[root@server2 ingress]# kubectl delete svc exsvc
[root@server2 ingress]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 24d
myservice ClusterIP 10.101.253.48 <none> 80/TCP 30h
[root@server2 ingress]# vim nginx.yml
[root@server2 ingress]# cat nginx.yml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-demo
spec:
rules:
- host: www1.westos.org
http:
paths:
- path: /
backend:
serviceName: myservice
servicePort: 80
[root@server2 ingress]# kubectl apply -f nginx.yml
[root@zhenji Desktop]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
10.4.17.241 www.westos.org linux.westos.org lee.westos.org login.westos.org wsgi.westos.org
192.168.100.103 www1.westos.org www2.westos.org linux.westos.org lee.westos.org login.westos.org wsgi.westos.org
[root@zhenji Desktop]# curl www1.westos.org
[root@zhenji Desktop]# curl www1.westos.org/hostname.html #负载均衡控制
[root@zhenji Desktop]# curl www1.westos.org/hostname.html
[root@zhenji Desktop]# curl www1.westos.org/hostname.html
3.nginx的负载均衡控制
[root@server2 ingress]# vim nginx-svc.yml
[root@server2 ingress]# cat nginx-svc.yml
---
apiVersion: v1
kind: Service
metadata:
name: nginx-svc
spec:
selector:
app: nginx
ports:
- protocol: TCP
port: 80
targetPort: 80
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: deployment
spec:
replicas: 2
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: myapp:v1
[root@server2 ingress]# kubectl apply -f nginx-svc.yml
[root@server2 ingress]# kubectl get pod -L app
[root@server2 ingress]# kubectl describe svc nginx-svc
Endpoints: 10.244.1.105:80,10.244.1.106:80
[root@server2 ingress]# vim nginx.yml
[root@server2 ingress]# cat nginx.yml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-demo
spec:
rules:
- host: www1.westos.org
http:
paths:
- path: /
backend:
serviceName: myservice
servicePort: 80
- host: www2.westos.org
http:
paths:
- path: /
backend:
serviceName: nginx-svc
servicePort: 80
[root@server2 ingress]# kubectl apply -f nginx.yml
[root@server2 ingress]# kubectl get ingress
NAME CLASS HOSTS ADDRESS PORTS AGE
ingress-demo <none> www1.westos.org,www2.westos.org 192.168.100.103 80 10m
[root@server2 ingress]# kubectl describe ingress ingress-demo#定义到不同的后端
[root@server2 ingress]# kubectl -n ingress-nginx exec -it ingress-nginx-controller-47b2l -- bash
bash-5.0$ cd /etc/nginx/
bash-5.0$ ls#就是nginx配置文件
生成key和证书
[root@server2 ingress]# openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=nginxsvc/O=nginxsvc"
Generating a 2048 bit RSA private key
............................................................................+++
........................+++
writing new private key to 'tls.key'
-----
[root@server2 ingress]# ll
total 36
-rw------- 1 root root 17728 Feb 24 02:05 deploy.yaml
-rw-r--r-- 1 root root 421 Feb 24 03:40 nginx-svc.yml
-rw-r--r-- 1 root root 380 Feb 24 03:43 nginx.yml
-rw-r--r-- 1 root root 1143 Feb 24 03:57 tls.crt
-rw-r--r-- 1 root root 1704 Feb 24 03:57 tls.key
[root@server2 ingress]# kubectl create secret tls tls-secret --key tls.key --cert tls.crt
secret/tls-secret created
[root@server2 ingress]# kubectl get secrets
NAME TYPE DATA AGE
default-token-xlsq2 kubernetes.io/service-account-token 3 24d
tls-secret kubernetes.io/tls 2 10s
[root@server2 ingress]# kubectl describe secrets tls-secret
#启用tls
[root@server2 ingress]# cat nginx.yml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-demo
spec:
tls:
- hosts:
- www1.westos.org
secretName: tls-secret
rules:
- host: www1.westos.org
http:
paths:
- path: /
backend:
serviceName: myservice
servicePort: 80
---
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-demo2
spec:
rules:
- host: www2.westos.org
http:
paths:
- path: /
backend:
serviceName: nginx-svc
servicePort: 80
[root@server2 ingress]# kubectl apply -f nginx.yml
[root@server2 ingress]# kubectl describe ingress ingress-demo#tls已经成功
[root@zhenji Desktop]# curl www1.westos.org -I#重定向了
HTTP/1.1 308 Permanent Redirect
Server: nginx/1.19.0
Date: Tue, 23 Feb 2021 20:02:50 GMT
Content-Type: text/html
Content-Length: 171
Connection: keep-alive
Location: https://www1.westos.org/
[root@zhenji Desktop]# curl www2.westos.org -I #没有重定向
HTTP/1.1 200 OK
Server: nginx/1.19.0
Date: Tue, 23 Feb 2021 20:06:45 GMT
Content-Type: text/html
Content-Length: 65
Connection: keep-alive
Last-Modified: Fri, 02 Mar 2018 03:39:12 GMT
ETag: "5a98c760-41"
Accept-Ranges: bytes
认证，生成认证文件
[root@server2 ingress]# yum provides */htpasswd
[root@server2 ingress]# yum install httpd-tools
#建立两个用户
[root@server2 ingress]# htpasswd -c auth wxh
New password:
Re-type new password:
Adding password for user wxh
[root@server2 ingress]# htpasswd auth admin
New password:
Re-type new password:
Adding password for user admin
[root@server2 ingress]# kubectl create secret generic basic-auth --from-file=auth#存进去
secret/basic-auth created
[root@server2 ingress]# kubectl get secrets
NAME TYPE DATA AGE
basic-auth Opaque 1 5s
default-token-xlsq2 kubernetes.io/service-account-token 3 24d
tls-secret kubernetes.io/tls 2 10m
[root@server2 ingress]# kubectl get secret basic-auth -o yaml
[root@server2 ingress]# vim nginx.yml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-demo
annotations:#添加，#查看用户信息
nginx.ingress.kubernetes.io/auth-type: basic
nginx.ingress.kubernetes.io/auth-secret: basic-auth
nginx.ingress.kubernetes.io/auth-realm: 'Authentication Required - wxh'
[root@server2 ingress]# kubectl apply -f nginx.yml
[root@server2 ingress]# kubectl describe ingress ingress-demo
#网页访问www1.westos.org/hostname.html 用户 密码
%%直接重定义到hostname.html界面上去
[root@server2 ingress]# vim nginx.yml
添加annotatiions:
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-demo2
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /hostname.html
[root@server2 ingress]# kubectl apply -f nginx.yml
网页访问www2.westos.org就可以
%%%%ingress地址重写
[root@server2 ingress]# vim nginx.yml
---
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-demo2
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /$2
spec:
rules:
- host: www2.westos.org
http:
paths:
- backend:
serviceName: nginx-svc
servicePort: 80
path: /westos(/|$)(.*)
[root@server2 ingress]# kubectl apply -f nginx.yml
[root@server2 ingress]# kubectl describe ingress ingress-demo2
[root@zhenji Desktop]# curl www2.westos.org/westos
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@zhenji Desktop]# curl www2.westos.org/westos/hostname.html
deployment-6456d7c676-wjq5w
[root@zhenji Desktop]# curl www2.westos.org/westos/hostname.html
deployment-6456d7c676-p9gsr
网页访问www2.westos.org/westos/hostname.html #关键字westos可以忽略不计
八、calico网络插件
- 官网：https://docs.projectcalico.org/getting-started/kubernetes/self-managed-onprem/onpremises
- calico简介：
flannel实现的是网络通信，calico的特性是在pod之间的隔离。
通过BGP路由，但大规模端点的拓扑计算和收敛往往需要一定的时间和计算资源。
纯三层的转发，中间没有任何的NAT和overlay，转发效率最好。
Calico 仅依赖三层路由可达。Calico 较少的依赖性使它能适配所有 VM、Container、白盒或者混合环境场景。
网络策略NetworkPolicy
1）限定指定pod访问（根据标签判断）
[root@server2 ~]# mkdir calico#插件
[root@server2 ~]# cd calico
[root@server2 calico]# vim deny-nginx.yaml
[root@server2 calico]# cat deny-nginx.yaml
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: deny-nginx
spec:
podSelector:
matchLabels:
app: nginx
[root@server2 calico]# apply -f deny-nginx.yml
[root@zhenji Desktop]# curl -k www1.westos.org -I
[root@server2 calico]# wget https://docs.projectcalico.org/manifests/calico.yaml#官方calico.yaml
[root@server2 calico]# cat calico.yaml#看需要的镜像4个
image: calico/cni:v3.16.1
image: calico/kube-controllers:v3.16.1
image: calico/pod2daemon-flexvol:v3.16.1
image: calico/node:v3.16.1
[root@server2 ~]# docker search calico
[root@server2 ~]# docker pull calico/kube-controllers:v3.18.0#下载太慢，版本高
[root@server2 ~]# docker pull calico/kube-controllers:v3.16.1
[root@server2 ~]# docker pull calico/pod2daemon-flexvol:v3.16.1
[root@server2 ~]# docker pull calico/node:v3.16.1
[root@server2 ~]# docker pull calico/cni:v3.16.1
[root@server2 ~]# docker tag calico/kube-controllers:v3.16.1#tag4个，分别push到私有仓库
[root@server2 calico]# rm -fr calico.yaml#版本不一样，换一个符合v3.16.1的calico.yaml
[root@zhenji file_recv]# scp calico.yaml root@192.168.100.102:/root/calico
root@192.168.100.102's password:
calico.yaml 100% 182KB 70.5MB/s 00:00
[root@server2 calico]# vim calico.yaml#注意镜像的路径，在library
注意镜像的路径，在library？
#1.搜IPIP，用于隧道
- name: CALICO_IPV4POOL_IPIP
value: "off"
#2.VXLAN
- name: CALICO_IPV4POOL_VXLAN
value: "Never"
#3.网段与之前的一致
- name: CALICO_IPV4POOL_CIDR
value: "10.244.0.0/16"
[root@server2 calico]# kubectl delete kube-flannel.yml#删除之前的策略
[root@server2 calico]# kubectl delete deployments.apps deployment
[root@server2 calico]# kubectl delete svc nginx-svc
[root@server2 calico]# kubectl -n kube-system get pod#都是running
[root@server2 ~]# cd /etc/cni/net.d/
[root@server2 net.d]# ls
10-flannel.conflist
[root@server2 net.d]# mv 10-flannel.conflist /mnt/#master和node所有节点都mv走
[root@server2 calico]# kubectl apply -f calico.yaml
[root@server2 calico]# kubectl apply -f nginx-svc.yml
[root@server2 calico]# kubectl get pod -L app #两个deployment在运行
[root@server2 calico]# kubectl get pod -o wide
[root@server2 calico]# kubectl get svc#nginx-svc的CLUSTER-IP：10.101.39.153
[root@server2 calico]# curl 10.101.39.153#通
[root@server2 calico]# curl 10.101.39.153/hostname.html#负载均衡
[root@server2 calico]# cat deny-nginx.yaml
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: deny-nginx
spec:
podSelector:
matchLabels:
app: nginx
[root@server2 calico]# apply -f deny-nginx.yml
[root@server2 calico]# kubectl get networkpolicies.networking.k8s.io
[root@server2 calico]# kubectl get svc#nginx-svc的CLUSTER-IP：10.101.39.153
[root@server2 calico]# curl 10.101.39.153#带有相应标签app: nginx的pod都拒绝
[root@server2 calico]# kubectl get pod -L app
[root@server2 calico]# kubectl run nginx --iamge=myapp:v2#自主式pod，没有标签
[root@server2 calico]# kubectl get pod -L app#没有标签APP
[root@server2 calico]# kubectl get pod -o wide#ip 是10.244.22.2
[root@server2 calico]# kubectl attach demo -it
/ # ping 10.244.22.2#能ping通自主式pod，没有标签的，带有nginx的不通
2）允许指定pod访问
[root@server2 calico]# vim access-demo.yaml
kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
name: access-nginx
spec:
podSelector:
matchLabels:
app: nginx
ingress:
- from:
- podSelector:
matchLabels:
app: demo
[root@server2 calico]# kubectl apply -f access-demo.yaml
[root@server2 calico]# kubectl get pod -o wide#ip 是10.244.22.2
[root@server2 calico]# kubectl get pod -L app#没有标签APP
[root@server2 calico]# kubectl lable pod demo app=demo#加标签demo
[root@server2 calico]# kubectl get pod -L app#nginx的标签是demo
[root@server2 calico]# kubectl attch demo -it
/ # ping 10.244.22.2能ping通demo的Ip
3)禁止namespace中所有pod之间的相互访问
[root@server2 calico]# vim deny-pod.yaml
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: default-deny
namespace: demo
spec:
podSelector: {}#没指定策略就是默认禁止
[root@server2 calico]# kubectl create namespace demo #创建namespace
[root@server2 calico]# kubectl get ns#有demo
[root@server2 calico]# kubectl run demo1 --image=busyboxplus -it -n demo#-n指定demo1
[root@server2 calico]# kubectl run demo2 --image=busyboxplus -it -n demo#-n指定demo2
[root@server2 calico]# kubectl get pod -n demo#有demo1和demo2
[root@server2 calico]# kubectl -n demo get pod --show-lables #run 给的标签run=demo1
[root@server2 calico]# kubectl -n demo get pod -L run
[root@server2 calico]# kubectl get pod -o wide#看ip:nginx是10.244.22.2
[root@server2 calico]# kubectl attach demo1 -it -n demo
/ # ping 10.244.22.3能ping通demo的Ip
[root@server2 calico]# kubectl apply -f deny-pod.yaml
[root@server2 calico]# kubectl get networkpolicies. -n demo#有default-deny策略
[root@server2 calico]# kubectl attach demo1 -it demo#ping不通
/ # ping 10.244.22.3#不能ping通demo的Ip
[root@server2 calico]# kubectl attach -it demo#其他namespace的pod也ping不通22.3，
/ # ping 10.244.22.3#不能ping通demo的Ip
4)禁止其他namespace的访问服务
[root@server2 calico]# vim deny-ns.yaml
kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
name: deny-namespace
spec:
podSelector:
matchLabels:
ingress:
- from:
- podSelector: {}
[root@server2 calico]# kubectl apply -f deny-ns.yaml
[root@server2 calico]# kubectl attach demo2 -it -n demo#所有的namespace都不能访问
/ # curl 10.244.22.2
5)允许指定的namespace访问
[root@server2 calico]# vim access-ns.yaml
kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
name: access-namespace
spec:
podSelector:
matchLabels:
run: nginx
ingress:
- from:
- namespaceSelector:
matchLabels:
role: prod
[root@server2 calico]# kubectl create namespace test
[root@server2 calico]# kubectl lable ns test role=prod#改标签,与access-ns.yaml一致
[root@server2 calico]# kubectl get ns --show-lables
[root@server2 calico]# kubectl get pod --show-lables#看标签
[root@server2 calico]# kubectl get pod -o wide#看ip:nginx是10.244.22.2
[root@server2 calico]# kubectl apply -f access-ns.yaml
[root@server2 calico]# kubectl attach demo3 -it -n demo#是允许的namespace，可以访问
/ # curl 10.244.22.2
[root@server2 calico]# kubectl attach demo2 -it -n demo#不能访问，根据标签匹配
/ # curl 10.244.22.2
6)允许外网访问
[root@server2 ingress]# cat demo.yml
[root@server2 ingress]# kubectl apply -f demo.yml
[root@server2 ingress]# kubectl get ingress#有ingress-demo
[root@server2 ingress]# kubectl describe ingress ingress-demo#有相应的Rules:nginx-svc
[root@server2 ingress]# kubectl -n ingress-nginx get svc#看ip172.25.0.100
[root@zhenji ~]# curl www1.westos.org#不通，被禁止了deny-nginx.yaml里面禁止nginx标签
[root@server2 ingress]# cd
[root@server2 ingress]# cd calico
[root@server2 calico]# vim access-ex.yaml
kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
name: web-allow-external
spec:
podSelector:
matchLabels:
app: web
ingress:
- ports:
- port: 80
from: []
[root@server2 calico]# kubectl apply -f access-ex.yaml
[root@zhenji ~]# curl www1.westos.org#通，从外部访问80
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