[Offline/Online] Install docker on CentOS7

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foreword

在CentOS7系统上离线跟在线两种方式安装docker

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1. Network installation (yum installation)

1. Installation command
-y：安装途中不需要是否确认，直至安装成功~

yum install -y docker

2. Make sure the yum package is updated to the latest version

yum -y update

3. Check whether the docker list has been installed

yum list installed | grep docker

4. Configure Alibaba Cloud Mirroring

Edit configuration file:

vi /etc/docker/daemon.json

Add the following code:

{
    
    
  "registry-mirrors": ["https://y0qd3iq.mirror.aliyuncs.com"]
}

2. No network installation

1. Download docker: docker offline installation package download address
The version downloaded in this article is:docker-18.06.3-ce.tgz

2. Install docker
and upload the docker offline installation package to the virtual machine:
通过cmd命令窗口上传（没有Xftp可以用以下方式）：

scp D:\Downloads\docker-18.06.3-ce.tgz [email protected]:/usr/local/

图文详解（仅供参考）：

虚拟机:

3. Unzip the installation package

tar -zxvf docker-18.06.3-ce.tgz

4. Move all the files in the docker after decompression to /usr/bin/the directory

cp docker/* /usr/bin/

5. Register docker as a system service

vi /etc/systemd/system/docker.service

Insert the following configuration file

[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target
 
[Service]
Type=notify
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s
 
[Install]
WantedBy=multi-user.target

6. Add execution permission to the configuration file

chmod +x /etc/systemd/system/docker.service

7. Reload the configuration file

systemctl daemon-reload

Three, operate docker

1. Start the docker service

systemctl start docker

2. Set docker to start automatically at boot

# 设置开机自启动
systemctl enable docker
# 关闭开机自启动
systemctl disable docker

2. View docker status

systemctl status docker

running状态标识docker正在运行。

3. Stop the docker service

systemctl stop docker

4. Uninstall docker

通过yum命令安装：
1. Find out the installed packages of docker

yum list installed | grep docker

2. Delete these packages by command

yum remove docker.x86_64 docker-client.x86_64 docker-common.x86_64 -y

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