Site Overlay

Suppress socket warnings when using rdiff-backup

Since I have been using rdiff-backup to backup my Xen domU machines, I get a daily message from cron which informs me that some sockets couldn’t be backed-up because the path is too long:

SpecialFileError var/spool/postfix/public/flush Socket error: AF_UNIX path too long

After some digging I have found that this is related to the length limitation of the AF_UNIX constant in one of the kernel header files, and which only allows 107 characters. Depending on where you want to backup to the length can exceed.

The solution is simple. Why do you want to backup sockets at all? Those are bound to the current system and will be executed when an application gets started. So I don’t see a reason to backup those files. Therefor just use the --exclude-sockets option for rdiff-backup.

Please note that you will have to run rdiff-backup twice before the failure message from above will no longer appear.

Scroll Up

By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

Close