linux运维、架构之路-Docker修改本地镜像存储位置

一、方法一：

1、查看Docker默认存放数据目录

[root@k8s-node1 tools]# docker info | grep "Docker Root Dir"
WARNING: API is accessible on http://127.0.0.1:4243 without encryption.
         Access to the remote API is equivalent to root access on the host. Refer
         to the 'Docker daemon attack surface' section in the documentation for
         more information: https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface
 Docker Root Dir: /var/lib/docker

2、停止Docker服务

 systemctl stop docker

3、移动Docker数据目录到指定的分区

[root@k8s-node1 app]# mv /var/lib/docker /app/data/docker    #这里/app为挂载的网络存储NAS
[root@k8s-node1 app]# ln -s /app/data/docker /var/lib/docke  #软链接到原来的目录

4、启动Docker服务查看存储目录

systemctl start docker

[root@k8s-node1 ~]# docker info|grep "Docker Root Dir"
WARNING: API is accessible on http://127.0.0.1:4243 without encryption.
         Access to the remote API is equivalent to root access on the host. Refer
         to the 'Docker daemon attack surface' section in the documentation for
         more information: https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface
 Docker Root Dir: /app/data/docker

 方法二：

1、/usr/lib/systemd/system/docker.service启动服务文件中指定

[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 --exec-opt native.cgroupdriver=systemd --data-root=/data/docker_data 
             --insecure-registry=hub.ityy.ultrapower.com.cn:5050 
             $DOCKER_NETWORK_OPTIONS
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
EnvironmentFile=-/run/flannel/docker
[Install]
WantedBy=multi-user.target

2、查看是否生效

docker info|grep Dir
Docker Root Dir: /data/docker_data