The database is full of such warning!

[vldanch]

2020-09-17 11:23:04 7 [Warning] Aborted connection 7 to db: 'unconnected' user: 'unauthenticated' host: '10.244.4.221' (This connection closed normally without authentication)
2020-09-17 11:23:11 12 [Warning] Aborted connection 12 to db: 'powerdns' user: 'powerdns' host: '10.244.3.118' (Got an error reading communication packets)
2020-09-17 11:23:12 17 [Warning] Aborted connection 17 to db: 'unconnected' user: 'unauthenticated' host: '10.244.3.118' (This connection closed normally without authentication)
2020-09-17 11:23:12 18 [Warning] Aborted connection 18 to db: 'powerdns' user: 'powerdns' host: '10.244.3.118' (Got an error reading communication packets)
2020-09-17 11:23:12 20 [Warning] Aborted connection 20 to db: 'powerdns' user: 'powerdns' host: '10.244.3.118' (Got an error reading communication packets)
2020-09-17 11:23:21 22 [Warning] Aborted connection 22 to db: 'powerdns' user: 'powerdns' host: '10.244.3.118' (Got an error reading communication packets)
2020-09-17 11:23:31 24 [Warning] Aborted connection 24 to db: 'powerdns' user: 'powerdns' host: '10.244.3.118' (Got an error reading communication packets)
2020-09-17 11:23:36 26 [Warning] Aborted connection 26 to db: 'unconnected' user: 'unauthenticated' host: '10.244.3.118' (This connection closed normally without authentication)
2020-09-17 11:23:41 29 [Warning] Aborted connection 29 to db: 'powerdns' user: 'powerdns' host: '10.244.3.118' (Got an error reading communication packets)
2020-09-17 11:23:46 31 [Warning] Aborted connection 31 to db: 'unconnected' user: 'unauthenticated' host: '10.244.3.118' (This connection closed normally without authentication)
2020-09-17 11:23:51 32 [Warning] Aborted connection 32 to db: 'powerdns' user: 'powerdns' host: '10.244.3.118' (Got an error reading communication packets)
2020-09-17 11:23:56 34 [Warning] Aborted connection 34 to db: 'unconnected' user: 'unauthenticated' host: '10.244.3.118' (This connection closed normally without authentication)

[aescanero]

@vldanch I need the logs from powerdns

[XiaohuaMa120023]

I hit the same issue in my database and here is the log for powerdns.

Sep 22 00:09:01 Fatal error: Trying to set unknown parameter 'innodb-read-committed' Sep 22 00:09:02 Our pdns instance exited with code 1, respawning Sep 22 00:09:03 Guardian is launching an instance Sep 22 00:09:03 Loading '/usr/lib/pdns/pdns/libgmysqlbackend.so' Sep 22 00:09:03 This is a guarded instance of pdns Sep 22 00:09:03 Fatal error: Trying to set unknown parameter 'innodb-read-committed' Sep 22 00:09:04 Our pdns instance exited with code 1, respawning Sep 22 00:09:05 Guardian is launching an instance Sep 22 00:09:05 Loading '/usr/lib/pdns/pdns/libgmysqlbackend.so' Sep 22 00:09:05 This is a guarded instance of pdns Sep 22 00:09:05 Fatal error: Trying to set unknown parameter 'innodb-read-committed' Sep 22 00:09:06 Our pdns instance exited with code 1, respawning Sep 22 00:09:07 Guardian is launching an instance Sep 22 00:09:07 Loading '/usr/lib/pdns/pdns/libgmysqlbackend.so'