DOCKER_VERSION=20.10.10
URL=https://mirrors.aliyun.com

prepare () {
    if [ ! -e docker-${DOCKER_VERSION}.tgz ];then
        wget ${URL}/docker-ce/linux/static/stable/x86_64/docker-${DOCKER_VERSION}.tgz
    fi
    [ $? -ne 0  ] && { echo "文件下载失败"; exit; }
}

install_docker () {
    tar xf docker-${DOCKER_VERSION}.tgz -C /usr/local/
    cp /usr/local/docker/* /usr/bin/
    cat > /lib/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
# 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 -H unix://var/run/docker.sock
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
EOF
    systemctl daemon-reload
	mkdir -p /etc/docker
    tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://si7y70hh.mirror.aliyuncs.com"]
}
EOF
	systemctl daemon-reload
	systemctl restart docker
}

start_docker (){
    systemctl enable --now docker
    docker version
}

prepare
install_docker
start_docker