Let's look at the df and du commands, which can check the disk space when operating the server and check the usage for each folder with insufficient capacity.
You can check the disk space with the df command and check the disk usage by folder with the du command to see which folders are frequently used.
Shows the free space on the disk.
df command document
Prints disk usage for all directories including subdirectories.
du command document
If the -h option is added, disk free space is displayed in gigabyte units.
$ df -h Filesystem Size Used Avail Use% Mounted on /dev/xvda1 80G 4.9G 76G 7% / devtmpfs 1.9G 0 1.9G 0% /dev tmpfs 1.9G 0 1.9G 0% /dev/shm tmpfs 1.9G 183M 1.7G 10% /run tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup tmpfs 379M 0 379M 0% /run/user/1000
If the -h option is added, the disk usage of the folder is displayed in gigabyte units.
Adding --max-depth limits subdirectories to the specified depth.
The command below processes the lower 1 depth directory as a target.
$du -h --max-depth=1
Finally, you can specify the target directory.
If no directory is specified, the current directory is the target.
$du -h --max-depth=1 /var
The sort -rh option can interfere with the output order in the order of the most used directories.
The head option specifies the number of outputs.
$du -h | sort -rh | head -20
The following command outputs up to 20 directories in the order of the most used directories among the subfolders of the /var folder.
$du -h | sort -rh | head -20 /var 4.9G . 3.3G ./var 2.9G ./var/lib/jenkins 2.9G ./var/lib 1.2G ./var/lib/jenkins/jobs/todo/builds 1.2G ./var/lib/jenkins/jobs/todo 1.2G ./var/lib/jenkins/jobs 1017M ./usr 648M ./var/lib/jenkins/workspace 615M ./var/lib/jenkins/.gradle