Обсуждение: Pg jdbc DNS failover
Hi. According to pgjdbc documantation, the driver supports failover when ip addresses and ports of host are comma separated, like this: jdbc:postgresql://my-db-host-slave-1:5432,my-db-host-master-1:5432/database?targetServerType=primary.
But it's not convenient, because we use k8s for pg, and there may be more slaves added and master ip may be changed.
I want to store all my hosts in DNS and to specify one hostname like this: jdbc:postgresql://my-db-host.local:5432/database?targetServerType=primary
I have a dns record with 2 ip addresses:
$ nslookup my-db-host.local
Server: 192.168.1.1
Address: 192.168.1.1#53
Non-authoritative answer:
Name: my-db-host-slave-1
Address: 192.168.10.21
Name: my-db-host-master-1
Address: 192.168.11.25
and I tried to specify it like this: jdbc:postgresql://my-db-host.local:5432/database?targetServerType=primary.
But this way it only picks the first ip - slave and fails with org.postgresql.util.PSQLException: Could not find a server with specified targetServerType: primary
Is there any workaround for using dns failover? May be some options in connection pools if driver does not support that?
Hi. According to pgjdbc documantation, the driver supports failover when ip addresses and ports of host are comma separated, like this:
jdbc:postgresql://my-db-host-slave-1:5432,my-db-host-master-1:5432/database?targetServerType=primary.But it's not convenient, because we use k8s for pg, and there may be more slaves added and master ip may be changed.
I want to store all my hosts in DNS and to specify one hostname like this:
jdbc:postgresql://my-db-host.local:5432/database?targetServerType=primaryI have a dns record with 2 ip addresses:
$ nslookup my-db-host.local Server: 192.168.1.1 Address: 192.168.1.1#53 Non-authoritative answer: Name: my-db-host-slave-1 Address: 192.168.10.21 Name: my-db-host-master-1 Address: 192.168.11.25and I tried to specify it like this:
jdbc:postgresql://my-db-host.local:5432/database?targetServerType=primary.But this way it only picks the first ip - slave and fails with
org.postgresql.util.PSQLException: Could not find a server with specified targetServerType: primaryIs there any workaround for using dns failover? May be some options in connection pools if driver does not support that?