centos8 离线安装docker

所需环境

1.CentOS8，内核版本需要大于3.10（使用uname -r查看内核版本）
2.docker安装包18.06.3（19版本我在使用中报了oci runtime的错误，但是18版本没问题）

建立安装脚本

将docker-18.06.3-ce.tgz传输到CentOS系统后，同目录下新建脚本install-docker.sh，输入以下内容：

#!/bin/sh

usage(){
  echo "使用方法: $0 FILE_NAME_DOCKER_CE_TAR_GZ"
  echo "       	  $0 docker-18.06.3-ce.tgz"
  echo "Get docker-ce binary from: https://download.docker.com/linux/static/stable/x86_64/"
  echo "eg: wget https://download.docker.com/linux/static/stable/x86_64/docker-18.06.3-ce.tgz"
  echo ""
}
SYSTEMDDIR=/usr/lib/systemd/system
SERVICEFILE=docker.service
DOCKERDIR=/usr/bin
DOCKERBIN=docker
SERVICENAME=docker

if [ $# -ne 1 ]; then
  usage
  exit 1
else
  FILETARGZ="$1"
fi

if [ ! -f ${FILETARGZ} ]; then
  echo "Docker binary tgz files does not exist, please check it"
  echo "Get docker-ce binary from: https://download.docker.com/linux/static/stable/x86_64/"
  echo "eg: wget https://download.docker.com/linux/static/stable/x86_64/docker-18.06.3-ce.tgz"
  exit 1
fi

echo "##unzip : tar xvpf ${FILETARGZ}"
tar xvpf ${FILETARGZ}
echo

echo "##binary : ${DOCKERBIN} copy to ${DOCKERDIR}"
cp -p ${DOCKERBIN}/* ${DOCKERDIR} >/dev/null 2>&1
which ${DOCKERBIN}

echo "##systemd service: ${SERVICEFILE}"
echo "##docker.service: create docker systemd file"
cat >${SYSTEMDDIR}/${SERVICEFILE} <<EOF
[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.com
After=network.target docker.socket
[Service]
Type=notify
EnvironmentFile=-/run/flannel/docker
WorkingDirectory=/usr/local/bin
ExecStart=/usr/bin/dockerd \\
                -H tcp://0.0.0.0:4243 \\
                -H unix:///var/run/docker.sock \\
                --selinux-enabled=false \\
                --log-opt max-size=1g
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=on-failure
[Install]
WantedBy=multi-user.target
EOF

echo ""

systemctl daemon-reload
echo "##Service status: ${SERVICENAME}"
systemctl status ${SERVICENAME}
echo "##Service restart: ${SERVICENAME}"
systemctl restart ${SERVICENAME}
echo "##Service status: ${SERVICENAME}"
systemctl status ${SERVICENAME}

echo "##Service enabled: ${SERVICENAME}"
systemctl enable ${SERVICENAME}
cat >/etc/docker/daemon.json <<EOF
{
  "registry-mirrors": ["http://hub-mirror.c.163.com"]
}
EOF
swapoff -a
iptables -P FORWARD ACCEPT
sysctl --system
systemctl daemon-reload
systemctl restart docker.service

echo "## docker version"
docker version

运行安装脚本

脚本新建好后应该如下图所示

接下来运行脚本安装：

sudo sh install-docker.sh docker-18.06.3-ce.tgz

安装会自动启用docker服务，自启动等。最后输出docker版本即表示已经安装成功

如果是非root账号，此时使用docker run等命令总是需要sudo权限，需要给当前用户添加docker权限

添加docker权限

建立docker组：

sudo groupadd docker

将当前用户加入 docker 组：

sudo usermod -aG docker $USER

重启 docker 服务：

sudo service docker restart 

此时断开ssh重新连接（或者退出当前终端并重新登录）
运行docker run不再提示没有权限