When I was working on a SLES 12 sp4 machine(/etc/SuSE-release file has the OS information), I want to edit some service file to change it to run in debug mode. But I couldn't edit that file as the editors like vi/gedit were complaining that the file system is read only. I have edited these files successfully in the past. I was wondering why I couldn't do this now.
I was able to find the fix from one stackoverflow post.
https://askubuntu.com/questions/197459/how-to-fix-sudo-unable-to-open-read-only-file-system
I ran "sudo fsck.ext4 -f ..." and gave yes to all the questions. Then a reboot was asked. Once the machine got rebooted, I was able to successfully edit the file.
To know the file system type (ext3/ext4/...), you can use "df -T" command. As I was editing one file which was present in /usr/lib/systemd, I had to look for the file system type of / in my case.
I was able to find the fix from one stackoverflow post.
https://askubuntu.com/questions/197459/how-to-fix-sudo-unable-to-open-read-only-file-system
I ran "sudo fsck.ext4 -f ..." and gave yes to all the questions. Then a reboot was asked. Once the machine got rebooted, I was able to successfully edit the file.
To know the file system type (ext3/ext4/...), you can use "df -T" command. As I was editing one file which was present in /usr/lib/systemd, I had to look for the file system type of / in my case.
