Fedora

The upgrade

Recently I upgraded a server from Fedora 21 to Fedora 23. This was a difficult process because newer kernels (> 3.14.23-100.fc19) won’t work with the system. Finally I was able to boot the system with the old kernel, but I was not seeing any information in /var/log/maillog. Sendmail was running and I was able to send and receive messages, but nothing was written to the maillog.

When I talked to somebody in #fedora he mentioned I could do a test by running the following simple command:

logger "hello world"

logger: socket /dev/log: Connection refused

The problem

When the Fedora 20 server at my parents rebooted because of a general power failure, the tinc tunnel between my parents and myself didn’t work anymore.

Troubleshooting

I enabled the debug logging by sending an INT signal to the daemon.

tincd -n ubbink -k INT

This resulted in the following log items (journalctl -f -l –unit tincd@ubbink.service):

tinc.ubbink[9707]: Got INT signal
tinc.ubbink[9707]: Temporarily setting debug level to 5.  Kill me with SIGINT again to go back to level 0.
tinc.ubbink[9707]: Trying to connect to amys (xxx.xxx.xxx.xxx port 655)
tinc.ubbink[9707]: xxx.xxx.xxx.xxx port 655: Network is unreachable
tinc.ubbink[9707]: Could not set up a meta connection to amys
tinc.ubbink[9707]: Trying to re-establish outgoing connection in 35 seconds
tinc.ubbink[9707]: Purging unreachable nodes

I couldn’t find why this was happening because when I used netcat to connect to port 655 via udp everything worked.

nc -vu xxx.xxx.xxx.xxx 655