When du shows the device is almost full and you have to delete something

Oops!
It’s completely full…

That’s the situation I ran into.
When I tried to install a certain module, it filled up the disk all at once.

ファイルシス   サイズ  使用  残り 使用% マウント位置
/dev/xvda1       8.0G  8.0G  0M   100% /
devtmpfs         3.9G     0  3.9G    0% /dev
tmpfs            3.7G     0  3.7G    0% /dev/shm
tmpfs            3.7G   17M  3.7G    1% /run
tmpfs            3.7G     0  3.7G    0% /sys/fs/cgroup

Checking file sizes within directories

• 1. Move to the target device and check file sizes
• 2. From there, check the locations where files are large

Repeating steps 1 and 2 above makes it easier to pin down the cause.

対象デバイスに移動し、ファイル容量チェック
$ cd /
$ sudo du -sh * | sort -nr

385M    root
267M    opt
117M    home
79M     boot
22M     etc
17M     run
3.1G    usr
2.7M    tmp
4.3G    var   ← /var がサイズが大きい
0       sys
0       srv
0       sbin
0       proc
0       mnt
0       media
0       lib64
0       lib
0       dev
0       bin

$ sudo find /var -size +100M -exec ls -lh {} \;

You could also search for archive files that are no longer needed after extraction, such as -name ‘*.tar.gz’.

Please also refer to my earlier post.
The yum cache can quietly grow huge before you even notice.

意外と容量食ってた yum cache

yum cache 容量12# du -sh /var/cache/yum155M /var/cache/yum 155MByteある汗 yum cache 削除12345# yum clean all読み込んだ…

After deleting various things,
I managed to free up about 30%. Phew.

I really need to keep a close eye on monitoring.