[Pdns-users] powerdns frequently crashes and restarts

Riccardo Brunetti riccardo.brunetti at host.it
Fri Feb 18 08:55:14 UTC 2022


We are having quite frequent crashes of our pdns server with the following syslog messages:

> Feb 17 13:39:33 xxxx.xxxxx.xxx.xxxx pdns_server[26672]: Exiting because communicator thread died with error: GSQLBackend unable to refresh domain_id XXXXX: Could not execute mysql statement: update domains set notified_serial=? where id=?: Deadlock found when trying to get lock; try restarting transaction
> Feb 17 13:39:34 xxxx.xxxxx.xxx.xxxx systemd[1]: pdns.service: main process exited, code=exited, status=1/FAILURE
> Feb 17 13:39:34 xxxx.xxxxx.xxx.xxxx systemd[1]: Unit pdns.service entered failed state.
> Feb 17 13:39:34 xxxx.xxxxx.xxx.xxxx systemd[1]: pdns.service failed.
> Feb 17 13:39:35 xxxx.xxxxx.xxx.xxxx systemd[1]: pdns.service holdoff time over, scheduling restart.
> Feb 17 13:39:35 xxxx.xxxxx.xxx.xxxx systemd[1]: Stopped PowerDNS Authoritative Server.
> Feb 17 13:39:35 xxxx.xxxxx.xxx.xxxx systemd[1]: Starting PowerDNS Authoritative Server...
> Feb 17 13:39:35 xxxx.xxxxx.xxx.xxxx pdns_server[25899]: Loading '/usr/lib64/pdns/libgmysqlbackend.so'
> Feb 17 13:39:35 xxxx.xxxxx.xxx.xxxx pdns_server[25899]: This is a standalone pdns

I don't know if this can be related, but just before those crashes we see messages like:

> Feb 17 13:39:32 xxxx.xxxxx.xxx.xxxx pdns_server[26672]: Request to queue notification for domain yyyyy.yy was processed, but no valid nameserver or ALSO-NOTIFYs found. Not notifying!

Just to mention briefly our setup: we are running:

PowerDNS Authoritative Server 4.5.2 (C)

in a percona mysql cluster with three nodes, each node having it's own mysql and pdns server (in order to have redundancy of database and APIs).

This cluster acts as a "backend master" for the real authoritative slaves, placed elsewhere, replicating the db.

Can you help us to understand why we have those crashes?


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