Monitoring disk usage¶
These are just my personal notes. No warranty whatsoever.
Table of contents
Built-in diagnose¶
Manually see the overall disk usage:
$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/simfs 15G 7.0G 8.1G 47% /
tmpfs 205M 2.1M 203M 2% /run
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 820M 0 820M 0% /run/shm
Show all directories that have more than a GB:
$ du ~ -h | grep '[0-9\.]\+G'
Show all subdirectories and their size (sorted by size):
$ du -h -d1 | sort -h
The -s or --summarize option means “only the specified directories, no subdirs”
$ du -sh ~/*
Thanks to Tracking down where disk space has gone and How To Find Large Files and Directories in Unix for hints.
Visual tools¶
Baobab:
$ sudo apt install baobab
$ baobab
Duc:
$ sudo apt install duc
$ duc index /usr
$ duc gui /usr
Automated diagnose¶
Install monit (sudo apt-get install monit ) and get alerts per
email. In /etc/monit/monitrc you can write for example:
check filesystem datafs with path /
if space usage > 80% for 5 times within 15 cycles then alert
if space usage > 99% then stop
Routine actions¶
Clean up the cache of the packet manager:
$ sudo apt-get clean
Cleaning the packaging system¶
To erase downloaded archive files:
$ sudo apt-get clean
To remove packages that were automatically installed to satisfy dependencies for some package and that are no more needed:
$ sudo apt-get autoremove
To see which kernel versions are installed:
$ dpkg --get-selections | grep linux-image
To remove an unused kernel image:
$ sudo apt-get remove --purge linux-image-X.X.XX-XX-generic
How much disk space does each database use?¶
MySQL:
$ sudo du -h /var/lib/mysql/
