0,下载安装包
wget https://download.docker.com/linux/static/stable/x86_64/docker-19.03.5.tgz
1,解压
tar -xvf docker-19.03.5.tgz
2, 将解压出来的docker目录下的文件移动到 /usr/bin/ 目录下
cp docker/* /usr/bin/
3,将docker注册为系统service
vi /usr/lib/systemd/system/docker.service
## 追加以下内容
[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=onfailure
StartLimitBurst=3
StartLimitInterval=60s
[Install]
WantedBy=multi-user.target
4,启动docker
# 添加文件权限并启动docker
chmod u+x /usr/lib/systemd/system/docker.service
# 重载unit配置文件
systemctl daemon-reload
# 启动Docker
systemctl start docker
5,加入开机启动项
## 添加
ln -s /usr/lib/systemd/system/docker.service /etc/systemd/system/multi-user.target.wants/docker.service
## 检查是否加入开机启动项
systemctl list-unit-files|grep docker
6.常见报错说明
(1), 报错1：启动镜像报错
报错原因说明：在Centos中未关闭SeLinux
- 内容如下：
docker: Error response from daemon: OCI runtime create failed: container_linux.go:345: starting container process caused "process_linux.go:430: container init caused "write /proc/self/attr/keycreate: permission denied"": unknown. - 解决方法：关闭SeLinux
- 临时关闭：setenforce 0
- 永久关闭：把“/etc/selinux/config”里面的SELINUX值修改为disabled，然后保存重启。
