Linux环境下Docker的安装

一、使用yum 在线安装 Docker

提示：简要介绍离线安装和在线安装的两种方式：
1.查看是否安装docker

	yum list installed | grep docker

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2.安装docker

	yum -y install docker

3 启动docker

systemctl start docker

4.查看docker服务状态

	systemctl status docker

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以上说明docker安装成功

二、离线安装方式

安装包官方地址：https://download.docker.com/linux/static/stable/x86_64/
1.创建下载目录

	mkdir /usr/local/docker
	cd /usr/local/docker

2.执行下载对应版本

wget https://download.docker.com/linux/static/stable/x86_64/docker-18.06.3-ce.tgz

3.解压文件

tar -zxvf docker-18.06.3-ce.tgz

4.将解压出来的docker文件复制到 /usr/bin/ 目录下

cp docker/* /usr/bin/

5.在/etc/systemd/system/目录下新增docker.service文件,这样可以将docker注册为service服务以方便开机启动

[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 --selinux-enabled=false --insecure-registry=127.0.0.1
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

–insecure-registry=127.0.0.1（此处改成你私服ip）设置是针对有搭建了自己私服Harbor时允许docker进行不安全的访问，否则访问将会被拒绝。
5.给docker.service文件添加执行权限

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

6.重新加载配置文件

systemctl daemon-reload

7.启动,重启,查看docker指令

systemctl start docker
systemctl restart docker
systemctl status docker

8.设为开机启动

systemctl enable docker.service