本文将主要概括一下docker的离线安装，以及在linux，ubuntu上的使用包管理工具安装
一、Docker离线安装
安装包官方地址：Index of linux/static/stable/x86_64/
1.1 找一台联网机器下载docker包
wget https://download.docker.com/linux/static/stable/x86_64/docker-20.10.17.tgz
1.2 将下载的压缩包拷贝到目标服务器后解压
tar zxf docker-20.10.17.tgz
1.3 将解压出来的docker文件复制到/usr/bin/目录下
cp docker/* /usr/bin/
1.4 创建docker.service文件
vi /usr/lib/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 --selinux-enabled=false
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
1.5 启动Docker
给docker.service文件添加执行权限：
chmod +x /usr/lib/systemd/system/docker.service
重新加载配置文件：
systemctl daemon-reload
启动docker并将docker加入开机自启动：
systemctl start docker
systemctl enable docker
1.6 查看docker服务状态
systemctl status docker
docker info
docker version
1.7 创建docker组
groupadd docker
1.8 将非root用户加到docker组
usermod -aG docker username
该离线安装适用于任何操作系统，可放心使用。
二、Docker在linux上的安装
2.1 安装包管理工具
yum-utils提供了yum-config-manager 效用，并device-mapper-persistent-data和lvm2由需要 devicemapper存储驱动程序
yum install -y yum-utils device-mapper-persistent-data lvm2
2.2 设置稳定存储库（阿里云）
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
2.3 安装Docker CE
yum install -y docker-ce docker-ce-cli containerd.io
2.4 启动Docker
systemctl enable docker && systemctl start docker
三、Docker在ubuntu上的安装
3.1 安装docker
apt install docker.io
3.2 启动docker
systemctl enable docker && systemctl start docker