流 年

docker运行时会产生日志，时间久了占用宿主机磁盘空间非常大，可以通过设置日志文件大小限制，也可以定期清除文件。

下面，清理docker运行占用的磁盘空间为例。

df 查看磁盘使用情况

df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            924M     0  924M   0% /dev
tmpfs           188M  856K  188M   1% /run
/dev/vda1        40G   36G  1.7G  96% /
tmpfs           940M     0  940M   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
overlay          40G   36G  1.7G  96% /var/lib/docker/overlay2/4d0744e41be2f1576b3c2a67d74af621738d37c85e305d75e0bf6fe2d2c3777f/merged
tmpfs            50M     0   50M   0% /usr/local/aegis/cgroup
overlay          40G   36G  1.7G  96% /var/lib/docker/overlay2/4a4a729a84a73b77b9a82daf2f2405412bb8e0a48ab41feda7ceca4438d375aa/merged
overlay          40G   36G  1.7G  96% /var/lib/docker/overlay2/6d4dd9f4a32de946509ed6d885d97660919dd60fff115ecbb322e9351f40cd36/merged
overlay          40G   36G  1.7G  96% /var/lib/docker/overlay2/4fb297559aa05464b68454b4bec76f57e7b61e30a4bfad4178a4a9c052650ade/merged
tmpfs           188M     0  188M   0% /run/user/0

查看docker容器占用情况

docker system df -v

Images space usage:

REPOSITORY                 TAG                    IMAGE ID       CREATED         SIZE      SHARED SIZE   UNIQUE SIZE   CONTAINERS
hub.wesais.cn/edge/caddy   2.5.1-alidns           3a0b492cc55f   8 months ago    82.64MB   44.37MB       38.27MB       1
caddy                      2.5.1-builder-alpine   c80070b3eb60   9 months ago    344.3MB   0B            344.3MB       0
snowdreamtech/frps         latest                 979d136fb73a   9 months ago    19.61MB   5.575MB       14.03MB       1
portainer/portainer-ce     latest                 7b6e59279c38   10 months ago   274.9MB   0B            274.9MB       1
caddy                      2.5.1                  e63f36e9049f   10 months ago   44.37MB   44.37MB       0B            0
ffdfgdfg/nps               latest                 52ebfd4ed926   23 months ago   15.14MB   0B            15.14MB       1

Containers space usage:

CONTAINER ID   IMAGE                                   COMMAND                  LOCAL VOLUMES   SIZE      CREATED        STATUS        NAMES
7322359af98a   snowdreamtech/frps:latest               "/bin/sh -c '/usr/bi…"   0               135B      8 months ago   Up 8 months   frps
3bd5cf44f1e1   hub.wesais.cn/edge/caddy:2.5.1-alidns   "caddy run --config …"   2               271B      8 months ago   Up 8 months   proxy-caddy-1
6cfb0bb63cfd   ffdfgdfg/nps                            "/nps"                   0               0B        9 months ago   Up 46 hours   nps
248dc2c11fda   portainer/portainer-ce                  "/portainer"             1               0B        9 months ago   Up 8 months   portainer-ce

Local Volumes space usage:

VOLUME NAME                LINKS     SIZE
proxy_caddy_proxy_data     1         6.58kB
portainer_data             1         114.1kB
proxy_caddy_proxy_config   1         880B

Build cache usage: 0B

CACHE ID   CACHE TYPE   SIZE      CREATED   LAST USED   USAGE     SHARED

清除没有使用过的镜像

docker system prune

进入docker目录，查看容器目录大小

cd /var/lib/docker/overlay2/
du -h --max-depth=1

在docker目录下查找容器运行的日志文件

 find /var/lib/docker/containers/ -name *-json.log |xargs du -sh
 60K    /var/lib/docker/containers/248dc2c11fda372bbbe6003a9b0792777b1552a0170888f252f7ccfabbddd615/248dc2c11fda372bbbe6003a9b0792777b1552a0170888f252f7ccfabbddd615-json.log
32G /var/lib/docker/containers/6cfb0bb63cfd6cc0d89e4118a503ff892a0b6420f01613591803cdeb6bc40655/6cfb0bb63cfd6cc0d89e4118a503ff892a0b6420f01613591803cdeb6bc40655-json.log
8.7M    /var/lib/docker/containers/7322359af98a17402d3464de1c963275200775192d6c8cae2756431f6f12b3ce/7322359af98a17402d3464de1c963275200775192d6c8cae2756431f6f12b3ce-json.log
328K    /var/lib/docker/containers/3bd5cf44f1e143b54aee2402a97274b59b666d22619c42e083ccf287d08b8826/3bd5cf44f1e143b54aee2402a97274b59b666d22619c42e083ccf287d08b8826-json.log

找到日志文件后，将它清空

cat /dev/null > /var/lib/docker/containers/6cfb0bb63cfd6cc0d89e4118a503ff892a0b6420f01613591803cdeb6bc40655/6cfb0bb63cfd6cc0d89e4118a503ff892a0b6420f01613591803cdeb6bc40655-json.log