
The Pi Hole DNS server seems to periodically die overnight and I can't seem to figure out why. It seems difficult to troubleshoot because there aren't many logs in /var/logs and they seem to rotate frequently so I don't think the necessary log entries would even be there in the morning when I notice.
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root@DietPi:~# systemctl status pihole-FTL
● pihole-FTL.service - LSB: pihole-FTL daemon
Loaded: loaded (/etc/init.d/pihole-FTL; generated; vendor preset: enabled)
Active: active (exited) since Fri 2019-04-12 00:17:03 PDT; 10h ago
Docs: man:systemd-sysv-generator(8)
Process: 7179 ExecStop=/etc/init.d/pihole-FTL stop (code=exited, status=0/SUCCESS)
Process: 7216 ExecStart=/etc/init.d/pihole-FTL start (code=exited, status=0/SUCCESS)
CGroup: /system.slice/pihole-FTL.service
Apr 12 00:17:02 DietPi systemd[1]: Starting LSB: pihole-FTL daemon...
Apr 12 00:17:02 DietPi pihole-FTL[7216]: Not running
Apr 12 00:17:02 DietPi su[7249]: Successful su for pihole by root
Apr 12 00:17:02 DietPi su[7249]: + ??? root:pihole
Apr 12 00:17:02 DietPi su[7249]: pam_unix(su:session): session opened for user pihole by (uid=0)
Apr 12 00:17:03 DietPi pihole-FTL[7216]: dnsmasq: failed to create listening socket for port 53: Address already in use
Apr 12 00:17:03 DietPi su[7249]: pam_unix(su:session): session closed for user pihole
Apr 12 00:17:03 DietPi systemd[1]: Started LSB: pihole-FTL daemon.