docker18.09 快速添加harbor仓库地址的方法（不是安装harbor）和修改镜像容器存放位置（初始化安装docker时，不是迁移容器镜像）...

系统版本：centos7.6

系统内核： 4.4

docker版本：18.09

找到docker.server启动文件位置，打开后，修改

[root@243-ceshi ~]#  vim /usr/lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
#BindsTo=containerd.service.  — 无需containerd。
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 unix://    --graph /app/software --insecure-registry=hub.vrgv.com
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always

# Note that StartLimit* options were moved from "Service" to "Unit" in systemd 229.
# Both the old, and new location are accepted by systemd 229 and up, so using the old location
# to make them work for either version of systemd.
StartLimitBurst=3

# Note that StartLimitInterval was renamed to StartLimitIntervalSec in systemd 230.
# Both the old, and new name are accepted by systemd 230 and up, so using the old name to make
# this option work for either version of systemd.
StartLimitInterval=60s

# 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

# Comment TasksMax if your systemd version does not supports it.
# Only systemd 226 and above support this option.
TasksMax=infinity

# 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

[Install]
WantedBy=multi-user.target

--graph：指定容器镜像存放位置

--insecure-registry：指定harbor仓库地址

另一种方法是配置/etc/docker/dameon.json文件，也可以的

[root@243-ceshi ~]# cat /etc/docker/daemon.json
{
  "registry-mirrors": ["https://v16stybc.mirror.aliyuncs.com"],"registry-mirrors": ["https://hub.vrgv.com"], "exec-opts": ["native.cgroupdriver=systemd"]
}