Docker安装说明详细
Docker安装
1.前置
1.1内核
docker官方说至少3.8以上，建议3.10以上（ubuntu下要linux内核3.8以上， RHEL/Centos 的内核修补过，centos6.5的版本就可以——这个可以试试）
uname -a
1.2卸载旧版本
检查是否已安装过docker
yum list installed |grep docker
卸载旧版本
yum remove docker docker-client docker-client-latest \
docker-common docker-latest docker-latest-logrotate \
docker-logrotate docker-engine
2.安装
2.1在线安装
安装docker仓库需要的依赖程序。
yum install -y yum-utils device-mapper-persistent-data lvm2
设置docker仓库
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
安装最新版docker
yum install docker-ce docker-ce-cli containerd.io
2.2离线安装
A.安装包地址：
https://download.docker.com/linux/static/stable/x86_64/
csdn下载地址(上面下载很慢，可以使用这个)
http://download.csdn.net/download/leadseczgw01/12043473
官方文档：
https://docs.docker.com/install/linux/docker-ce/binaries/#install-static-binaries
B.解压文件并移动
tar xvf docker-19.03.5.tgz
将解压出来的docker文件内容移动到 /usr/bin/ 目录下
cp docker/* /usr/bin/
c.将docker注册为service
vim /etc/systemd/system/docker.service
将下列配置加到docker.service中并保存
[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
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.targetD.添加文件权限并启动docker
chmod +x /etc/systemd/system/docker.service
重载unit配置文件
systemctl daemon-reload
启动Docker
systemctl start docker
设置开机自启
systemctl enable docker.service
2.3镜像加速
对于使用 systemd 的系统（Ubuntu 16.04+、Debian 8+、CentOS 7）， 在配置文件 /etc/docker/daemon.json 中加入：
{
"registry-mirrors": [
"https://dockerhub.azk8s.cn",
"https://reg-mirror.qiniu.com/",
"https://docker.mirrors.ustc.edu.cn/"
]
}然后重新启动Docker服务
sudo systemctl daemon-reload
sudo systemctl restart docker
参考文档：
http://mirrors.ustc.edu.cn/help/dockerhub.html?highlight=docker
3.运行
sudo systemctl start docker
测试
sudo docker run hello-world