docker镜像默认存储路径在 /var/lib/docker/ 下 ，在实际部署中，经常碰到客户的 / 分区只给到20g , 甚至更小，而我们的每个镜像又达到1G ,这就需要我们在部署的时候根据磁盘空间合理选择存储目录。
在ExecStart 后面加上参数如下，将docker的默认存储目录改至 /app/dockers 目录下
--graph /app/dockers
systemctl restart docker.service 重启docker 服务后生效
cat /lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=https:
//docs
.docker.com
After=network.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
$DOCKER_OPTS --insecure-registry=docker.zhixueyun.com:5000 --graph
/app/dockers
ExecReload=
/bin/kill
-s HUP $MAINPID
EnvironmentFile=-
/etc/default/docker
# 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
[Install]
WantedBy=multi-user.target
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