yum install -y yum-utils device-mapper-persistent-data lvm2

yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

yum  -y install docker-ce

systemctl start docker

docker version

https://download.docker.com/linux/static/stable/x86_64/

tar -xvf docker-18.06.-ce.tgz

cp docker/* /usr/bin/

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  and above support this version.

#TasksMax=infinity

TimeoutStartSec=

# 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=

StartLimitInterval=60s

[Install]

WantedBy=multi-user.target

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

systemctl daemon-reload

systemctl start docker

systemctl enable docker.service

原文：https://blog.csdn.net/ywd1992/article/details/82897394 

ll  /usr/share/bash-completion/completions/docker

source  /usr/share/bash-completion/completions/docker