An issue with tar
Trying to make a simple backup script that will tar at the end
Script:
!/bin/bash
What to back up
backup_files="home etc root var usr/local/bin usr/local/sbin srv opt "
Where
dest="/home/backup"
Create
day=$(date +%A)
hostname=$(hostname -s)
archive=$hostname-$day.tgz
Print start
echo "Backing up system stand by"
date
echo
Tar command
tar czf $dest/$archive_file $backup_files
Print end
echo
echo "Back up finished Thank you for your patience"
date
End of script
Results when ran
Backing up system stand by
Fri Sep 10 03:32:15 UTC 2021
tar: home: Cannot stat: No such file or directory
tar: etc: Cannot stat: No such file or directory
tar: root: Cannot stat: No such file or directory
tar: var: Cannot stat: No such file or directory
tar: usr/local/bin: Cannot stat: No such file or directory
tar: usr/local/sbin: Cannot stat: No such file or directory
tar: srv: Cannot stat: No such file or directory
tar: opt: Cannot stat: No such file or directory
tar (child): /home/backup/: Cannot open: Is a directory
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now
Back up finished Thank you for your patience
Fri Sep 10 03:32:15 UTC 2021
What is the issue?
Answers
-
What stands out for me is the fact that the directories you are trying to backup are defined in the backup_files variable with relative paths. In other words, the default "home" folder can only be acessed like that if you are in root directory (/). Instead, the absolute path "/home" can be acessed anywhere in the machine - assuming you have the necessary permissions.
First things first:
- Consider using absolute paths
- Watch out for permissions - if you want access to some directories, you need to be the root user
- Rethink your strategy e.g. do you really need to backup everything in /var? Read about directories like /var/run and/var/lock
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