PiHole DNS not Responding, disk full
The Internet seemed unreachable at my house. After checking with the provider I determined it was due to my pihole being down.
Logging into the dashboard of my pihole showed "Lost Connection to API". This indicated an issue with the pihole-FTL service.
After logging in the Unify CloudKey where I installed pihole I used df -h to determined that the disk was full
root@UniFi-CloudKey:~# df -h Filesystem Size Used Avail Use% Mounted on aufs-root 2.9G 2.9G 0 100% / udev 10M 0 10M 0% /dev
It was due to 3 things:
apt cache at "/var/cache/apt/archives"
CloudKey backups at "/data/autobackup"
pihole-FTL database at "/etc/pihole/pihole-FTL.db"
You can cleanup the first using "apt-get autoclean". For the second, you can manually delete some of the old backups but perhaps you should set a better backup policy in your CloudKey.
The third one accumulates all the queries ever done against your pihole (18M in the past 2 years for me) unless you set something like MAXDBDAYS=90 in /etc/pihole/pihole-FTL.conf. Mine was 1.4GB.
You can stop the pihole-FTL with "service pihole-FTL stop", delete the file, and restart it, if you want. Or perform a more surgical cleaning directly deleting old entries from the database before restarting it.
