docker资源清理

1. 清理存在但未使用的资源

[root@test ~]# docker system prune
WARNING! This will remove:
  - all stopped containers
  - all networks not used by at least one container
  - all dangling images
  - all dangling build cache

Are you sure you want to continue? [y/N]

2. 镜像清理

Remove unused images
[root@test ~]# docker image prune

  -a, --all             Remove all unused images, not just dangling ones
[root@test ~]# docker image prune -a

3. Remove all stopped containers

docker container prune

4. 查看资源磁盘占用率

[root@test ~]# docker system df
TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          27        27        14.16GB   3.654GB (25%)
Containers      34        34        796.1MB   0B (0%)
Local Volumes   13        5         8.089GB   554.1MB (6%)
Build Cache     0         0         0B        0B

---

查看某个容器占用磁盘特别大

1. 查看docker container

[root@test ~]# docker info |grep Dir
 Docker Root Dir: /data/docker
[root@liuming_xd25 containers]# pwd
/data/docker/containers
[root@liuming_xd25 containers]# du -sh * |grep G
1.9G    33f6e2043842568f4cf99dbf1ef405f8717c7a3ed1fea4fe79ab331cbd85bebd
1.3G    6404f6568d1d37d29e41b94b0bc05697f677f6269ee039edd30161935437dd6a
# 容器下有*-json.log 文件，清空该文件
echo > {}-json.log

2. 修改docker配置，限制日志大小

[root@test ~]# cat /etc/docker/daemon.json
{
    "log-driver": "json-file",
    "log-opts": {
        "max-size": "500m"，
        "max-file": "3"
    }
}

max-size=500m，代表一个容器日志大小上限是500M
max-file=3，代表一个容器有三个日志，分别是id+.json、id+1.json、id+2.json。

systemctl daemon-reload
systemctl restart docker