安装包官方地址：https://download.docker.com/linux/static/stable/x86_64/
注：具体版本需要查看CPU架构
可以先下载到本地，然后通过ftp工具上传到服务器上，或者在服务器上使用命令下载
wget https://download.docker.com/linux/static/stable/x86_64/docker-18.06.3-ce.tgz
tar -zxvf docker-18.06.3-ce.tgz
cp docker/* /usr/bin/在/etc/systemd/system/目录下新增docker.service文件，内容如下，这样可以将docker注册为service服务
[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启动docker
给docker.service文件添加执行权限
chmod +x /etc/systemd/system/docker.service
重新加载配置文件（每次有修改docker.service文件时都要重新加载下）
systemctl daemon-reload
启动
systemctl start docker
设置开机启动
systemctl enable docker.service
查看docker服务状态
systemctl status docker二、Ubuntu自动安装
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
apt-get install docker.io
本文安装的 docker 版本为 18.09.7。
执行如下命令新建 /etc/docker/daemon.json 文件：
cat > /etc/docker/daemon.json <<-EOF
{
"registry-mirrors": [
"https://a8qh6yqv.mirror.aliyuncs.com",
"http://hub-mirror.c.163.com"
],
"exec-opts": ["native.cgroupdriver=systemd"]
}
EOF
注：
registry-mirrors 为镜像加速器地址。
native.cgroupdriver=systemd 表示使用的 cgroup 驱动为 systemd（k8s 使用此方式），默认为 cgroupfs。修改原因是 kubeadm.conf 中修改k8s的驱动方式不成功。
重启docker，查看 cgroup：
# systemctl restart docker
# docker info | grep -i cgroup
Cgroup Driver: systemd
出现 systemd 表示修改成功
注：在CFast卡制作的文件系统时，每次机开机重启时启动docker失败，报错：localhost dockerd[609]: crypto/rand: blocked for 60 seconds waiting to read random data from the kernel。
解决办法：
sudo apt-get install haveged
# 启动
systemctl start haveged
# 开机自启动
systemctl enable haveged