docker鏡像默認存儲路徑在 /var/lib/docker/ 下 ，在實際部署中，經常碰到客戶的 / 分區只給到20g , 甚至更小，而我們的每個鏡像又達到1G ,這就需要我們在部署的時候根據磁盤空間合理選擇存儲目錄。
在ExecStart 后面加上參數如下，將docker的默認存儲目錄改至 /app/dockers 目錄下
--graph /app/dockers
systemctl restart docker.service 重啟docker 服務后生效
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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