vnstat not updating on certain interfaces
centos, monitor, network-monitoring, traffic
Solution
Check which user the vnstat daemon is running as using `ps aux | grep [v]nstat`.
I recently had the same problem and after priming the database with `vnstat -u -i eth0` as root the vnstat process couldn't write to the `/var/lib/vnstat/eth0` file as it was running as user "vnstat".
If vnstat is running as user "vnstat" ensure that it has permission to write to `/var/lib/vnstat/eth0`.
Problem
vnstat is updating only one interface every five minutes. I have to use vnstat -u to manually update the rest of interfaces. All interfaces are already enabled, but only one interface is updating every 5 minutes.