docker磁盘空间不足，修改数据存储路径

修改docker数据存储路径

docker的默认的数据存储路径为/var/lib/docker/，如果其所在磁盘空间较小，容易出现磁盘空间不足的问题，这是就需要修改docker的数据存储路径，并迁移数据

docker的数据存储路径可通过docker info命令查看

[root]# docker info
 ...
 Docker Root Dir: /var/lib/docker/
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 ...

1.执行命令df -h，找一个大的磁盘， 然后创建新的数据目录

df -h
mkdir -p /data/docker/lib

2.停止docker服务

systemctl stop docker

3.迁移/var/lib/docker目录下的数据到新创建的目录/data/docker/lib

rsync -avz /var/lib/docker /data/docker/lib/

4.修改docker配置文件/etc/docker/daemon.json，默认没有，需要自己创建

{
    "data-root": "/data/docker/lib/docker"
}

5.然后重启docker服务就ok了

systemctl daemon-reload
systemctl restart docker

6.执行docker info确认一下Docker Root Dir修改是否已经生效

[root]# docker info
 ...
 Docker Root Dir: /a8root/data/docker/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 ...

7.执行docker images 和docker ps -a 确认一下之前的镜像和容器是否正常

[root@tx3-suggest-dev08 docker]# docker images
REPOSITORY           TAG       IMAGE ID       CREATED         SIZE
mysql                5.7       6c20ffa54f86   7 days ago      448MB
redis                latest    fad0ee7e917a   2 months ago    105MB
tensorflow/serving   2.3.0     e0fe79fbb64f   12 months ago   286MB
elasticsearch        7.2.0     0efa6a3de177   2 years ago     861MB
elasticsearch        5.6.3     7e555e9f4ab4   3 years ago     581MB
[root@tx3-suggest-dev08 docker]# docker ps -a
CONTAINER ID   IMAGE                 COMMAND                  CREATED        STATUS                         PORTS     NAMES
a8ad4663a11b   mysql:5.7             "docker-entrypoint.s…"   5 days ago     Exited (0) About an hour ago             mysql
2ca8588f37a5   elasticsearch:5.6.3   "/docker-entrypoint.…"   2 months ago   Exited (143) 2 hours ago                 es
c9645fe96ce8   elasticsearch:7.2.0   "/usr/local/bin/dock…"   2 months ago   Exited (143) 2 months ago                elasticsearch
9ddbadad9900   redis                 "docker-entrypoint.s…"   2 months ago   Exited (0) 2 hours ago                   redis-test

8.确定没问题后就可以删除/var/lib/docker/目录中的文件来释放磁盘空间了

rm -rf /var/lib/docker