Docker安装默认存储路径修改与镜像恢复

环境介绍：

CentOS 7.5
Docker 13.1.1

查看Docker默认存储目录：

[root@localhost ~]# yum -y install docke
[root@localhost ~]# systemctl start docker
[root@localhost ~]# systemctl enable docker
[root@localhost ~]# docker info      //查看docker基本信息
...
Docker Root Dir: /var/lib/docker     //默认为/var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Experimental: false
...

备份已有镜像并修改默认存储目录：

1.查看挂载的磁盘

[root@localhost ~]# df -h     //显示挂载情况
文件系统                 容量  已用  可用 已用% 挂载点
...
/dev/sdb1                 20G   33M   20G    1% /mnt/data

2.备份当前已有镜像

 docker save -o 文件名.tar 镜像名

[root@localhost ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
docker.io/nginx     latest              602e111c06b6        2 days ago          127 MB

[root@localhost ~]# docker save -o /mnt/nginx.tar docker.io/nginx
          //备份当前已有的镜像

[root@localhost ~]# docker rmi 60

3.停止docker并修改配置文件

[root@localhost ~]# systemctl stop docker

[root@localhost ~]# vim /etc/docker/daemon.json
{
"registry-mirrors": ["http://hub-mirror.c.163.com"],
"graph": "/mnt/data"        //添加存储路径
}

导入镜像并查看修改后存储路径

1.导入备份的镜像文件

 docker load --input 镜像文件.tar
 docker load < 镜像文件.tar

[root@localhost ~]# systemctl start docker

[root@localhost ~]# docker load --input /mnt/nginx.tar  或者  docker load < /mnt/nginx.tar  
c2adabaecedb: Loading layer [==================================================>] 72.49 MB/72.49 MB
216cf33c0a28: Loading layer [==================================================>] 58.11 MB/58.11 MB
b3003aac411c: Loading layer [==================================================>] 3.584 kB/3.584 kB
Loaded image: docker.io/nginx:latest

[root@localhost ~]# docker images    //查看导入后镜像
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
docker.io/nginx     latest              602e111c06b6        2 days ago          127 MB

2.查看修改后的存储路径

[root@localhost ~]# docker info
...
Docker Root Dir: /mnt/data     //存储路径已修改
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Experimental: false
Insecure Registries:
 127.0.0.0/8
Registry Mirrors:
 http://hub-mirror.c.163.com