目录

一、docker安装步骤

Ⅰ、官方安装文档

Ⅱ、具体安装步骤

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一、docker安装步骤

Ⅰ、官方安装文档

Install Docker Engine | Docker Documentation

Ⅱ、具体安装步骤

1、卸载原来安装过的docker，如果没有安装可以不需要卸载

 yum remove docker \
                   docker-client \
                   docker-client-latest \
                   docker-common \
                   docker-latest \
                   docker-latest-logrotate \
                   docker-logrotate \
                   docker-engine

2、安装yum相关工具，下载docker-ce

yum install -y yum-utils 
yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

3、安装docker引擎

 yum install docker-ce docker-ce-cli containerd.io docker-compose-plugin

• container engine容器引擎

• docker是一个容器管理的软件

• docker-ce是服务器端软件

• serverdocker-ce-cli是客户端软件client

• docker-compose-plugin是compose插件，用来批量后动很多容器，在单台机器上containerd.io底层用来后动容器的

4、启动docker服务

[root@shimm ~]# systemctl start docker
[root@shimm ~]# ps -ef|grep docker
root       9841      1  0 11:40 ?        00:00:00 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
root       9969   6331  0 11:40 pts/0    00:00:00 grep --color=auto docker
[root@shimm ~]#

5、设置开机自启：

[root@shimm ~]# systemctl enable docker
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
[root@shimm ~]# 

docker

docker进程与镜像 --docker ps/images

[root@shimm ~]# docker ps
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES
[root@shimm ~]# docker images
REPOSITORY   TAG       IMAGE ID   CREATED   SIZE
[root@shimm ~]#

<!--images镜像--> <!--镜像里面包含了我们需要的软件的代码和基础环境，以及依赖软件-->

[root@shimm ~]# docker pull nginx
Using default tag: latest
latest: Pulling from library/nginx
7a6db449b51b: Pull complete 
ca1981974b58: Pull complete 
d4019c921e20: Pull complete 
7cb804d746d4: Pull complete 
e7a561826262: Pull complete 
7247f6e5c182: Pull complete 
Digest: sha256:b95a99feebf7797479e0c5eb5ec0bdfa5d9f504bc94da550c2f58e839ea6914f
Status: Downloaded newer image for nginx:latest
docker.io/library/nginx:latest
[root@shimm ~]# docker images
REPOSITORY   TAG       IMAGE ID       CREATED      SIZE
nginx        latest    2b7d6430f78d   2 days ago   142MB
[root@shimm ~]#

6、启动docker容器

[root@shimm ~]# docker run -d -p 8090:80 --name sc-nginx nginx
544c8aabacb957c6225a4f01e6f1a9ad2555dc76d53d870cd6334cf155d5c069
[root@shimm ~]# docker ps   #查看启动的进程
CONTAINER ID   IMAGE     COMMAND                  CREATED         STATUS         PORTS                                   NAMES
544c8aabacb9   nginx     "/docker-entrypoint.…"   7 minutes ago   Up 7 minutes   0.0.0.0:8090->80/tcp, :::8090->80/tcp   sc-nginx
[root@shimm ~]#

• docker run 是启动容器的命令

• 启动一个容器是，可以理解为开启一台虚拟机

• -d 在后台运行 daemon 守护进程

• -p 8090:80指定端口映射 DNAT访问本机的809e端口，转发到docker容器的80端口

• name sc-nginx指定容器的名字

• nginx 是镜像的名字

7、客户机测试是否能访问

若不成功尝试关闭虚拟机防火墙(service firewalld stop),重启服务（service docker）

涉及docker命令

• docker --version 查看docker版本号

• docker ps 查看进程

• docker imager 查看镜像

• docker run （下载某个容器）

• docker pull (nginx) 下载（nginx）镜像

• docker start 启动一个容器

补：

[root@shimm ~]# **docker info**
Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Docker Buildx (Docker Inc., v0.8.2-docker)
  compose: Docker Compose (Docker Inc., v2.6.0)
  scan: Docker Scan (Docker Inc., v0.17.0)

Server:
 Containers: 1
  Running: 1
  Paused: 0
  Stopped: 0
 Images: 1
 Server Version: 20.10.17
 Storage Driver: overlay2
  Backing Filesystem: xfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 0197261a30bf81f1ee8e6a4dd2dea0ef95d67ccb
 runc version: v1.1.3-0-g6724737
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
 Kernel Version: 3.10.0-1160.el7.x86_64
 Operating System: CentOS Linux 7 (Core)
 OSType: linux
 Architecture: x86_64
 CPUs: 2
 Total Memory: 1.777GiB
 Name: shimm
 ID: I3GL:BOQV:PC4K:KJ6Z:OFKZ:UHCD:CH5H:TE7Y:6NJ5:LRAE:43GD:Y22I
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false