k8s部署mysql一主多从集群
需求:master写,slave读。NFS映射mysql文件到本地,删除或重启pod或容器不会删除文件。
k8s部署mysql一主多从集群
小部分参考大神https://blog.csdn.net/weixin_38320674/article/details/106089098
大部分都是一个地方学一点,再自己拼凑而成。
需求:master写,slave读。NFS映射mysql文件到本地,删除或重启pod或容器不会删除文件。
服务器 2核2G
192.168.0.27 master1
192.168.0.138 node1
192.168.0.52 node2
192.168.0.11 node3
需要提前准备好NFS挂载。
- 配置pv
cat mysql-pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv-nfs-mysql01 #创建的pv名称可创建多个.
namespace: mt-math #属于的命名空间
spec:
capacity:
storage: 5Gi #创建的pv容量为1G
accessModes:
- ReadWriteOnce #pv的访问模式:可读可写可挂在多个节点
persistentVolumeReclaimPolicy: Retain #回收策略
nfs: #创建的pv数据来源
path: /nfs/mysql/pv01 #数据源目录
server: 192.168.0.27 #数据源ip
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv-nfs-mysql02 #创建的pv名称可创建多个.
namespace: mt-math #属于的命名空间
spec:
capacity:
storage: 5Gi #创建的pv容量为1G
accessModes:
- ReadWriteOnce #pv的访问模式:可读可写可挂在多个节点
persistentVolumeReclaimPolicy: Retain #回收策略
nfs: #创建的pv数据来源
path: /nfs/mysql/pv02 #数据源目录
server: 192.168.0.27 #数据源ip
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv-nfs-mysql03 #创建的pv名称可创建多个.
namespace: mt-math #属于的命名空间
spec:
capacity:
storage: 5Gi #创建的pv容量为1G
accessModes:
- ReadWriteOnce #pv的访问模式:可读可写可挂在多个节点
persistentVolumeReclaimPolicy: Retain #回收策略
nfs: #创建的pv数据来源
path: /nfs/mysql/pv03 #数据源目录
server: 192.168.0.27 #数据源ip
生效
kubectl apply -f mysql-pv.yaml
显示
- 配置configMap
cd /data/mysql-cluster/mysql1
cat mysql_configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: mysql
namespace: mt-math #namespace
labels:
app: mysql
data:
master.cnf: |
[mysqld]
log-bin
log_bin_trust_function_creators=1 #关闭MySQL对创建存储函数实施的限制
lower_case_table_names=1 #设置大小写不敏感
skip-name-resolve #解决找不到master.0.master问题
slave.cnf: |
[mysqld]
super-read-only #只读模式
log_bin_trust_function_creators=1
skip-name-resolve
生效
kubectl apply -f mysql_configmap.yaml
查看
- 创建SVC
cat mysql-services.yaml
apiVersion: v1
kind: Service
metadata:
name: mysql
namespace: mt-math
labels:
app: mysql
spec:
ports:
- name: mysql
port: 3306
clusterIP: None
selector:
app: mysql
---
apiVersion: v1
kind: Service
metadata:
name: mysql-read
namespace: mt-math
labels:
app: mysql
spec:
ports:
- name: mysql
port: 3306
selector:
app: mysql
生效
kubectl apply -f mysql-services.yaml
查看
- 部署StatefulSet
cat mysql-statefulset.yaml
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: mysql
namespace: mt-math
spec:
selector:
matchLabels:
app: mysql
serviceName: mysql
replicas: 3
template:
metadata:
namespace: mt-math
labels:
app: mysql
spec:
initContainers:
- name: init-mysql
image: mysql:5.7
command:
- bash
- "-c"
- |
set -ex
[[ `hostname` =~ -([0-9]+)$ ]] || exit 1
ordinal=${BASH_REMATCH[1]}
echo [mysqld] > /mnt/conf.d/server-id.cnf
echo server-id=$((100 + $ordinal)) >> /mnt/conf.d/server-id.cnf
if [[ $ordinal -eq 0 ]]; then
cp /mnt/config-map/master.cnf /mnt/conf.d/
else
cp /mnt/config-map/slave.cnf /mnt/conf.d/
fi
volumeMounts:
- name: conf
mountPath: /mnt/conf.d
- name: config-map
mountPath: /mnt/config-map
- name: clone-mysql
image: gcr.io/google-samples/xtrabackup:1.0
command:
- bash
- "-c"
- |
set -ex
[[ -d /var/lib/mysql/mysql ]] && exit 0
[[ `hostname` =~ -([0-9]+)$ ]] || exit 1
ordinal=${BASH_REMATCH[1]}
[[ $ordinal -eq 0 ]] && exit 0
ncat --recv-only mysql-$(($ordinal-1)).mysql 3307 | /usr/bin/xbstream -x -C /var/lib/mysql
xtrabackup --prepare --target-dir=/var/lib/mysql
volumeMounts:
- name: data
mountPath: /var/lib/mysql
subPath: mysql
- name: conf
mountPath: /etc/mysql/conf.d
containers:
- name: mysql
image: mysql:5.7
env:
- name: MYSQL_ALLOW_EMPTY_PASSWORD
value: "1"
ports:
- name: mysql
containerPort: 3306
volumeMounts:
- name: data
mountPath: /var/lib/mysql
subPath: mysql
- name: conf
mountPath: /etc/mysql/conf.d
resources:
requests:
cpu: 500m
memory: 1Gi
livenessProbe:
exec:
command: ["mysqladmin", "ping"]
initialDelaySeconds: 30
periodSeconds: 10
timeoutSeconds: 5
readinessProbe:
exec:
command: ["mysql", "-h", "127.0.0.1", "-e", "SELECT 1"]
initialDelaySeconds: 5
periodSeconds: 2
timeoutSeconds: 1
- name: xtrabackup
image: gcr.io/google-samples/xtrabackup:1.0
ports:
- name: xtrabackup
containerPort: 3307
command:
- bash
- "-c"
- |
set -ex
cd /var/lib/mysql
if [[ -f xtrabackup_slave_info ]]; then
mv xtrabackup_slave_info change_master_to.sql.in
rm -f xtrabackup_binlog_info
elif [[ -f xtrabackup_binlog_info ]]; then
[[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]]+(.*?)$ ]] || exit 1
rm xtrabackup_binlog_info
echo "CHANGE MASTER TO MASTER_LOG_FILE='${BASH_REMATCH[1]}',\
MASTER_LOG_POS=${BASH_REMATCH[2]}" > change_master_to.sql.in
fi
if [[ -f change_master_to.sql.in ]]; then
echo "Waiting for mysqld to be ready (accepting connections)"
until mysql -h 127.0.0.1 -e "SELECT 1"; do sleep 1; done
echo "Initializing replication from clone position"
mv change_master_to.sql.in change_master_to.sql.orig
mysql -h 127.0.0.1 <<EOF
$(<change_master_to.sql.orig),
MASTER_HOST='mysql-0.mysql',
MASTER_USER='root',
MASTER_PASSWORD='',
MASTER_CONNECT_RETRY=10;
START SLAVE;
EOF
fi
exec ncat --listen --keep-open --send-only --max-conns=1 3307 -c \
"xtrabackup --backup --slave-info --stream=xbstream --host=127.0.0.1 --user=root"
volumeMounts:
- name: data
mountPath: /var/lib/mysql
subPath: mysql
- name: conf
mountPath: /etc/mysql/conf.d
resources:
requests:
cpu: 100m
memory: 100Mi
volumes:
- name: conf
emptyDir: {}
- name: config-map
configMap:
name: mysql
volumeClaimTemplates:
- metadata:
name: data
namespace: mt-math
spec:
accessModes: ["ReadWriteOnce"]
resources:
requests:
storage: 5Gi
生效
kubectl apply -f mysql-statefulset.yaml
查看
注意:此处坑比较多。有volume找不到,salve-mysql报错等问题,安装我这个步骤就不会遇到了。
看看文件夹
有时候也会自己坑自己,到处找的时候一定要清理赶紧,slave3一直peding,现在才发现是被之前测试的挂载了。
- 环境验证
连接主库写入数据
kubectl run mysql-client --image=mysql:5.7 -it --rm --restart=Never -- mysql -h mysql-0.mysql.mt-math
CREATE DATABASE demo;
CREATE TABLE demo.messages (message VARCHAR(250));
INSERT INTO demo.messages VALUES ('hello');
从库查看数据
kubectl run mysql-client --image=mysql:5.7 -it --rm --restart=Never -- mysql -h mysql-1.mysql.mt-math
SHOW DATABASES;
这东西搞了我一下午,什么错误都出现了,网上教程还都是一个人有一点。
太难了
这篇肯定不是最好的,以后多更新几篇其他的安装方法和不同集群架构部署方式。
红牛都续不了命了,好难受。
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