How to resolve `FATAL: could not write lock file "postmaster.pid": No space left on device` error? [closed]
This is not really a programming question so it should be on superuser.
Short answer -
reboot the system.
If the system comes back up, try:
find / -mtime -3 -size +100000 -exec ls -ls {} \; | sort -nThe largest newest files will be at the bottom of the list. If you can see that the file is not part of an app- a data file for example- remove it. You need at least 5% free space on /.
Long term you must add more disk space, like double or triple what you have.