docker下載地址
https://download.docker.com/linux/static/stable/x86_64/

下載安裝
wget https://download.docker.com/linux/static/stable/x86_64/docker-19.03.6.tgz
tar -zvxf docker-19.03.6.tgz
cp docker/* /usr/bin/

直接執行
/usr/bin/dockerd

demon模式執行,並儲存日誌
nohup /usr/bin/dockerd >/docker.log 2>&1 &

systemctl執行
sudo 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
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s

[Install]
WantedBy=multi-user.target
 

設定許可權許可權為可執行
chmod +x /etc/systemd/system/docker.service

新增阿里雲映象j
cat > /etc/docker/daemon.json << EOF
{
"registry-mirrors": ["https://zxnkv11f.mirror.aliyuncs.com"]
} 
EOF

常用命令
systemctl daemon-reload //過載配置檔案
systemctl start docker //啟動Docker
systemctl stop docker //關閉docker
systemctl restart docker //重啟docker
systemctl enable docker.service //設定開機自啟
systemctl status docker //檢視Docker狀態

很多時候在我們掛載磁碟後不想用docker預設目錄 可 -g 修改目錄 （docker 預設目錄在/var/lib/docker下，包括 pull下來的映象都在該目錄下）
ExecStart修改為:
ExecStart=/usr/bin/dockerd -g /xiaobo/docker

指令碼安裝docker

#/bin/bash
wget https://download.docker.com/linux/static/stable/x86_64/docker-19.03.6.tgz
tar -zvxf docker-19.03.6.tgz
cp docker/* /usr/bin/

cat > /etc/systemd/system/docker.service << EOF
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target

[Service]
Type=notify
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s

[Install]
WantedBy=multi-user.target

EOF

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

mkdir -p /etc/docker/
cat > /etc/docker/daemon.json << EOF
{
"registry-mirrors": ["https://zxnkv11f.mirror.aliyuncs.com"]
} 
EOF

systemctl daemon-reload
systemctl start docker
systemctl enable docker.service
systemctl status docker