centos离线安装docker的那点小事

将docker信息复制到/usr/bin目录下

cp -r docker* /usr/bin/

#ll /usr/bin/docker*
-rwxrwxrwx. 1 root root 38442504 Mar 17 02:16 /usr/bin/docker
-rwxrwxrwx. 1 root root 71297680 Mar 17 02:16 /usr/bin/dockerd
-rwxrwxrwx. 1 root root   708448 Mar 17 02:16 /usr/bin/docker-init
-rwxrwxrwx. 1 root root  1979949 Mar 17 02:16 /usr/bin/docker-proxy

配置docker.service

# cat /etc/systemd/system/docker.service 
[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 --selinux-enabled=false
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

当我们要连接仓库时，在/etc/docker/daemon.json文件中配置

# cat daemon.json 
{
"registry-mirrors": ["https://8h5ozec7.mirror.aliyuncs.com"],
"insecure-registries": ["192.168.161.200:5000","10.177.67.221","10.189.4.241","10.172.49.246","10.128.128.251"],
"dns":["8.8.8.8","8.8.4.4"],
"hosts": ["unix:///var/run/docker.sock","tcp://0.0.0.0:2375"]
}

1.有端口的话，就将端口配置上，默认端口是80，可以不配置

2.dns的地址需要配置，否则，主机无法解析/etc/hosts中的信息，导致连接超时

3.insecure-registries的地址信息，不应该在docker.service中，而是应该在daemon.json文件中

4.当在docker.service中配置时，再在daemon.json文件中，将导致docker应用无法启动