Docker安装-docker-Yjc Blog

安装环境

操作系统：CentOS 7.4
docker版本：docker-18.09.3

说明

docker要求内核版本不低于 3.10，如果要在CentOS上安装，需要CentOS 7.X系统，在CentOS 6.X上安装需要升级内核版本。

即使在CentOS 7.X上安装，也建议内核升级到4.14以上。

安装

docker官方为了简化安装流程，已经提供了一套安装脚本，运行以下命令就可以完成安装：

curl -fsSL get.docker.com -o install-docker.sh
sh install-docker.sh --mirror Aliyun

不过有时候服务器不能访问互联网，或者想安装指定版本的docker，那么可以使用以下的脚本进行安装：

#!/bin/sh

usage(){
  echo "Usage: $0 FILE_NAME_DOCKER_CE_TAR_GZ"
  echo "       $0 docker-18.09.3.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-18.09.3.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-18.09.3.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}

echo "## docker version"
docker version

将以上脚本保存为install-docker.sh，将指定版本的docker安装包作为参数执行，如以下命令： sh install-docker.sh docker-18.09.3.tgz

脚本自动会启动docker，安装完成后即可看到docker的版本信息。

镜像加速

国内访问docker hub官网比较慢，可使用国内的一些镜像加速地址。本文使用的是ustc的开源镜像https://docker.mirrors.ustc.edu.cn 。

cat >> /etc/docker/daemon.json << EOF
{
  "registry-mirrors": ["https://xxx.mirror.aliyuncs.com"]
}
EOF
systemctl daemon-reload
systemctl restart docker