Check disk space
Shows filesystem disk space usage and types.
df -ThDisk full on a Linux host
A filesystem is at or near 100% and writes are starting to fail. All playbooks.
Find which filesystem is full.
Find the biggest files on it.
Find files over 100 MB
Finds files over 100 MB on the root filesystem, largest first.
sudo find / -xdev -type f -size +100M -exec du -h {} + 2>/dev/null | sort -rh | head -20From the full mount point, walk down the largest directories.
Largest items in the current directory
Lists the 10 largest files and directories here (dotfiles excluded).
du -hs * | sort -rh | head -10If df says full but du doesn't add up, a process is holding deleted files open. Restart that process to free the space.
Find deleted files still held open
Lists files that were deleted but are still open. Their space is not freed until the process closes them, so a disk can be full while du looks fine.
sudo lsof +L1Trim the systemd journal to 500 MB.
Caution. Deletes the oldest journal entries for good.
sudo journalctl --vacuum-size=500MOn Docker hosts, see how much space images, containers, volumes and build cache use.
docker system dfRemove dangling images.
Remove dangling images
Removes dangling images: untagged <none> layers left behind by rebuilds.
docker image prune -fDelete old rotated logs, after checking the list.
Delete log files older than 30 days
Finds .log files older than 30 days under /var/log and deletes them.
Caution. Deletes files permanently. Run it once without -delete to see the list first.
sudo find /var/log -type f -name "*.log" -mtime +30 -delete