【已完成】docker怎么清理多余的垃圾

之前建立容器的时候有些好像没删干净的，占用了很多不该占用的空间
但是现在我看不懂哪些是正在用的，哪些是没用的
有什么办法可以清理吗



root@instance-20230928-1001:~# du -h / | sort -rh | head -n 30
du: cannot access '/proc/3131324/task/3131324/fd/3': No such file or directory
du: cannot access '/proc/3131324/task/3131324/fdinfo/3': No such file or directory
du: cannot access '/proc/3131324/fd/4': No such file or directory
du: cannot access '/proc/3131324/fdinfo/4': No such file or directory
40G        /
30G        /var
26G        /var/lib
25G        /var/lib/docker/overlay2
25G        /var/lib/docker
17G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7
8.3G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/merged
8.1G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/diff
5.2G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/merged/www
5.2G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/diff/www
5.1G        /www
4.9G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/merged/www/server
4.9G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/diff/www/server
4.9G        /var/lib/docker/overlay2/0638dc31f2d022ec17d405f29310c98847b09d61e87b68a2000cba6a5c1c68cb
4.3G        /var/log
4.0G        /var/log/journal/a15f629ee0554be5895e7e4f14c9c5e6
4.0G        /var/log/journal
2.6G        /var/lib/docker/overlay2/0638dc31f2d022ec17d405f29310c98847b09d61e87b68a2000cba6a5c1c68cb/merged
2.6G        /usr
2.4G        /var/lib/docker/overlay2/0638dc31f2d022ec17d405f29310c98847b09d61e87b68a2000cba6a5c1c68cb/diff
2.1G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/merged/www/server/data
2.1G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/diff/www/server/data
1.8G        /snap
1.7G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/merged/var/log/journal/a15f629ee0554be5895e7e4f14c9c5e6
1.7G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/merged/var/log/journal
1.7G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/merged/var/log
1.7G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/merged/var
1.7G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/diff/var/log/journal/a15f629ee0554be5895e7e4f14c9c5e6
1.7G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/diff/var/log/journal
1.7G        /var/lib/docker/overlay2/c43d32402c95453e7d4321f22edf5703de2a3de6c3ecfc66bd146e0053da6cd7/diff/var/log

如果有项目在进行，还是不要操作删除文件，像log日志这些是可以清理的，操作前请务必备份好服务器资料。

docker的每一个页面都有清理功能，可以清理掉未使用的
不建议自行手动清理，要操作的话，先做好服务器快照