low-filesystem-space

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Finding the big files/directory which are the problem:

Good commands to see disk usage:

shopt -s extglob
du -shc /!(proc|sys)
du -shc *|grep '\S*[MG]'|sort -g

If du is significantly different than df

Try lsof +L1 to show files open with less than 1 filesystem link to show files that have been deleted but are still taking up space. This can happen if you rm a log file which is being written to and is normally logrotated: it will continue to grow forever until the writing process is stopped. If you want to reduce the size of a log file like that, manually invoke logrotate, then you can safely delete the rotated file.

Misc

You should never need this, but it's cool. To see space used underneath mount points, bind mount the parent mount somewhere else:

mount --bind / /mnt
du -sh /mnt

GNU Hope

If the host is on GNU Hope and the filesystem does need more space, see instructions for expanding the filesystem with gnuhope