1、安裝環境

此處在Centos7進行安裝，可以使用以下命令檢視CentOS版本

lsb_release -a

在CentOS 7安裝docker要求系統為64位、系統核心版本為 3.10 以上，可以使用以下命令檢視

uname -r

2、用yum源安裝

2.1 檢視是否已安裝docker列表

yum list installed | grep docker

2.2 安裝docker

yum -y install docker

-y表示不詢問安裝，直到安裝成功，安裝完後再次檢視安裝列表

2.3 啟動docker

systemctl start docker

2.4 檢視docker服務狀態

systemctl status docker

以上說明docker安裝成功

3、離線安裝模式

3.1 安裝包官方地址：https://download.docker.com/linux/static/stable/x86_64/

可以先下載到本地，然後通過ftp工具上傳到伺服器上，或者在伺服器上使用命令下載

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

3.2 解壓

tar -zxvf docker-18.06.3-ce.tgz

3.3 將解壓出來的docker檔案複製到/usr/bin/ 目錄下

cp docker/* /usr/bin/

3.4 在/etc/systemd/system/目錄下新增docker.service檔案，內容如下，這樣可以將docker註冊為service服務

[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

此處的--insecure-registry=127.0.0.1（此處改成你私服ip）設定是針對有搭建了自己私服Harbor時允許docker進行不安全的訪問，否則訪問將會被拒絕。

3.5 啟動docker

給docker.service檔案新增執行許可權

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

重新載入配置檔案（每次有修改docker.service檔案時都要重新載入下）

systemctl daemon-reload

啟動

systemctl start docker

設定開機啟動

systemctl enable docker.service

檢視docker服務狀態

systemctl status docker

上圖表示docker已安裝成功

原文連結:https://www.cnblogs.com/kingsonfu/p/11576797.html