1.下载docker-19.03.8.tgz

wget https://download.docker.com/linux/static/stable/x86_64/docker-19.03.8.tgz

2.解压 docker-19.03.8.tgz

tar -xvf docker-19.03.8.tgz

3. 复制

sudo cp docker/* /usr/bin/

4.复制一下内容到 vim /etc/systemd/system/docker.service

[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target
[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
# Uncomment TasksMax if your systemd version supports it.
# Only systemd 226 and above support this version.
#TasksMax=infinity
TimeoutStartSec=0
# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes
# kill only the docker process, not all processes in the cgroup
KillMode=process
# restart the docker process if it exits prematurely
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s
 
[Install]
WantedBy=multi-user.target

5.加载文件 使其生效

systemctl daemon-reload 

6.重启动docker

systemctl  restart docker 

7.开机自启docker命令

systemctl enable docker

8.重启系统检查服务是否正在运行

ps -aux | grep docker

9.检查服务是否开机启动

systemctl is-enabled docker.service  

如果docker开机未自启，按照以下命令重新设置开启自启

1.将服务配置成开机启动

systemctl enable docker.service  

2.启动服务

systemctl start docker.service  

Docker更换国内镜像源

修改/etc/docker/daemon.json配置文件

cat << 'EOF' > /etc/docker/daemon.json
{
  "registry-mirrors": ["https://registry.docker-cn.com","http://hub-mirror.c.163.com" ],
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
  "max-size": "50m"
},
  "storage-driver": "overlay2",
  "storage-opts": [
  "overlay2.override_kernel_check=true"
  ]
}
EOF

容器开机启动： 创建容器时候指定restart参数：

docker run -it -p 6379:6379 --restart=always  --name redis -d redis

docker自启

docker run -d --name phpmyadmin -p 80:80 --restart=always 44924:latest

对已经创建的容器用docker update 更新:

docker update --restart=always  xxx

--restart具体参数值详细信息 :
no - 容器退出时，不重启容器
on-failure - 只有在非0状态退出时才从新启动容器
always - 无论退出状态是如何，都重启容器

安装docker-compose

（1）首先访问 docker-compose 的 GitHub 版本发布页面：

• https://github.com/docker/compose/releases

（2）由于服务器是 CentOS 系统，则下载 Linux 版本的 Compose：

（3）将下载下来的“docker-compose-Linux-x86_64”文件上传到服务器上，然后执行如下命令将其移动到 /usr/local/bin，并改名为“docker-compose”。

mv docker-compose-Linux-x86_64 /usr/local/bin/docker-compose

（4）接着执行如下命令添加可执行权限：

chmod +x /usr/local/bin/docker-compose

（5）最后使用 docker-compose -v 命令测试是否安装成功（如果提示“没有那个文件或目录”可以重启下服务器再试试）：

kail安装好docker之后 构建容器可能会报错，使用以下命令解决该问题

sudo mkdir /sys/fs/cgroup/systemd
sudo mount -t cgroup -o none,name=systemd cgroup /sys/fs/cgroup/systemd