redhat7.7安装docker全过程

yum -y install gcc
yum -y install gcc-c++

#卸载
yum -y remove docker docker-common docker-selinux docker-engine
yum install -y yum-utils device-mapper-persistent-data lvm2

yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

yum makecache fast

yum -y install docker-ce

#启动
systemctl start docker
#测试
docker version
docker run hello-world

#关闭docker服务
kill -9 *** 
#创建启动文件
vim /etc/systemd/system/docker.service
写入如下内容
[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 -H tcp://0.0.0.0:2375 -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 

#赋权
chmod +x /etc/systemd/system/docker.service

# 重载systemd下 xxx.service文件
systemctl daemon-reload   
# 启动Docker
systemctl start docker     
#重启
systemctl restart docker
# 设置开机自启 
systemctl enable docker.service   
注这时候systemctl stop docker 命令可能不成功，reboot重启后所有命令生效
完成用二进制文件安装docker！！

#报错container init caused \“write /proc/self/attr/keycreate: permission denied\““: unknown
原因“/proc/self/attr/keycreate” 这里没有写入权限，把“/etc/selinux/config”里面的SELINUX值修改为disabled
SELINUX=disabled

#查看镜像
docker images
#保存本地
docker save 999c20aee5da > /home/artipub.tar 999c20aee5da为镜像ID
#本地导入docker
docker load < /Volumes/SoftWare/artipub.tar
#改名
docker tag 999c20aee5da artipub:latest

mkdir -p /etc/docker
vim  /etc/docker/daemon.json
systemctl daemon-reload
systemctl restart docker