docker/vfs/dir目录大量大文件清理

刚刚给openwrt扩容了overlay空间，装了几个docker应用，然后df -h的时候，就发现刚刚才分配的5G空间，只剩下500M了，WTF？

于是又折腾了一下，权当学习Linux命令了

root@BleachWrt:~# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root               329.0M    329.0M         0 100% /rom
tmpfs                     1.8G     25.1M      1.8G   1% /tmp
/dev/sda3                 4.8G      3.7G    847.6M  82% /overlay
overlayfs:/overlay        4.8G      3.7G    847.6M  82% /
/dev/sda1                16.0M      5.8M     10.2M  36% /boot
/dev/sda1                16.0M      5.8M     10.2M  36% /boot
tmpfs                   512.0K         0    512.0K   0% /dev
cgroup                    1.8G         0      1.8G   0% /sys/fs/cgroup
overlayfs:/overlay        4.8G      3.7G    847.6M  82% /opt/docker
/dev/sda1                16.0M      5.8M     10.2M  36% /mnt/sda1

以上显示还剩余847.6M是因为卸载了一个应用，返还了一点点
先用docker system prune命令，测试对于我这个问题无用，这个命令的作用是<code class="prettyprint" >清理磁盘，删除关闭的容器、无用的数据卷和网络，以及dangling镜像
通过du -sh /*先看看根目录下哪个文件夹占用最多

root@BleachWrt:~# du -sh /*
1.8M    /bin
5.2M    /boot
0       /dev
46.5M   /etc
8.0K    /home
0       /htdocs
128.5M  /lib
0       /lib64
640.0K  /mnt
3.7G    /opt #就是他了！
3.7G    /overlay
0       /proc
1.1G    /rom
332.0K  /root
36.0K   /run
1.5M    /sbin
0       /srv
0       /sys
13.7M   /tmp
945.2M  /usr
0       /var
47.6M   /www

一路追查。。。
然后du -sh /overlay/upper/opt/docker/vfs/*到这里，基本就破案了

root@BleachWrt:/overlay/upper/opt/docker/vfs# du -sh /overlay/upper/opt/docker/vfs/*
0       /overlay/upper/opt/docker/vfs/backingFsBlockDev
3.7G    /overlay/upper/opt/docker/vfs/dir

继续看看du -sh /overlay/upper/opt/docker/vfs/dir/*

root@BleachWrt:/overlay/upper/opt/docker/vfs# du -sh /overlay/upper/opt/docker/vfs/dir/*
19.4M   /overlay/upper/opt/docker/vfs/dir/0a84c0875e30c410816178bd5dd77cef4a0ef2014e5d7b17891bb3db0e4ca3b9
89.1M   /overlay/upper/opt/docker/vfs/dir/1eb55d6beeebb40d6f35578c48ff35a2610d3c28bafaf5906dcb3fbe1027056d
69.1M   /overlay/upper/opt/docker/vfs/dir/1fb03ddf9eda6e632b6edf95b7b0e282c1a28663c8b23f83a8dfd82aa4ec6fc1
70.7M   /overlay/upper/opt/docker/vfs/dir/2474f0572c14082fbc3226413fef1867a41aacf3f0fbde4ac05f217eb8ee752c
89.1M   /overlay/upper/opt/docker/vfs/dir/26907ce345fb452dd920d0eb655b76fbb8da9bcfe2f9400ddf7484a7ec836b40
13.7M   /overlay/upper/opt/docker/vfs/dir/30c488bad1ad220784429d599b46e551d4e7aa2dea19b18861fda6e506ae20e2
89.1M   /overlay/upper/opt/docker/vfs/dir/32209e49c2565b26ed258be0f32536fb37014583b2bd6bea58824a862505b5fb
1.6M    /overlay/upper/opt/docker/vfs/dir/41377346103c502b496d72302b811612ba4088d7b4775303bd09e51ab285d9e8
132.1M  /overlay/upper/opt/docker/vfs/dir/41b76fc24686f0eac20c83daa3ddc256ffe8e11c695fb632bd5fd557778c16b5
594.4M  /overlay/upper/opt/docker/vfs/dir/4538f1aabe7b8dcb7a8d05c4bddb69e7b8f7470e01cfddb36b294a7746d6432a
13.7M   /overlay/upper/opt/docker/vfs/dir/4bfe7c56e029d9ef6095dd6ed1696745219feb6c4993da348d8c26bbf660216d
595.0M  /overlay/upper/opt/docker/vfs/dir/62b3b917d961acfd9874558415f7a1ac61599068da77d3743f9f96efcd69715d
594.4M  /overlay/upper/opt/docker/vfs/dir/62b3b917d961acfd9874558415f7a1ac61599068da77d3743f9f96efcd69715d-init
28.9M   /overlay/upper/opt/docker/vfs/dir/8b2c532faa32d40878f84a4271e4d460b34854a001ac60a29ee3fadd165c12e4
131.9M  /overlay/upper/opt/docker/vfs/dir/8b76db561b026d770907de9a7ac7731c641125bf164be82307a4a2b5857d9f91
80.8M   /overlay/upper/opt/docker/vfs/dir/97291f57b2df86b6a9b55d0b6238fd8d677689d730592c33685064a671f3bc6d
594.4M  /overlay/upper/opt/docker/vfs/dir/9a83bbbf157087ce012b9c9fd0b7c8a9e83444bb1bf80a25ab9eb6d2cda25272
26.5M   /overlay/upper/opt/docker/vfs/dir/b9c585bbecacac603d41e733e9a4ea80b9ab8f0d06a9db416e67c0d794b57e04
162.2M  /overlay/upper/opt/docker/vfs/dir/bff7e2d1b331b2c35f5bdb3ebe06eb912ed51bb512fb1f9fe3257328ef4ba521
1.7M    /overlay/upper/opt/docker/vfs/dir/c93ddeaa16ee1e1a78eb8d4ad56e604d71e7fa5564f53305df604efcdd0d493c
3.3M    /overlay/upper/opt/docker/vfs/dir/cd42daa993de00a4142679b566b833d01caf9ef889601ff7bace1c3228a8c4d3
13.7M   /overlay/upper/opt/docker/vfs/dir/de33015df28b182908c68b2a7af4c0d0fa73a60beda822b4540f0508dcb88e3f
29.1M   /overlay/upper/opt/docker/vfs/dir/e24b5c50e0fba095b6272f28ea6717a431fcda6a0db26c8af705be801f5766bb
89.1M   /overlay/upper/opt/docker/vfs/dir/e5de8a3546795b3dc308d4e52e1a740ae2cc26184d5e691f2a4d32a54d492713
69.3M   /overlay/upper/opt/docker/vfs/dir/eb2aa69d0a955987cf63f27da15bb855fdcfd12a6b372515ec45378ea4e69a92
162.1M  /overlay/upper/opt/docker/vfs/dir/f124aae2b37082d1217b713152d9ddaec664716d45ae9480e0c08b61d213bee5

简单查了一下如何清理/var/lib/docker/vfs目录 | docker，不知道是干什么的，反正大不了重新刷OP，果断RM
执行rm -r /overlay/upper/opt/docker/vfs/dir
然后df -h验证一下

root@BleachWrt:/overlay/upper/opt/docker/vfs# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root               329.0M    329.0M         0 100% /rom
tmpfs                     1.8G     13.7M      1.8G   1% /tmp
/dev/sda3                 4.8G    157.2M      4.4G   3% /overlay
overlayfs:/overlay        4.8G    157.2M      4.4G   3% /
/dev/sda1                16.0M      5.8M     10.2M  36% /boot
/dev/sda1                16.0M      5.8M     10.2M  36% /boot
tmpfs                   512.0K         0    512.0K   0% /dev
cgroup                    1.8G         0      1.8G   0% /sys/fs/cgroup
overlayfs:/overlay        4.8G    157.2M      4.4G   3% /opt/docker
/dev/sda1                16.0M      5.8M     10.2M  36% /mnt/sda1

哈哈，又舒服了！