Re: How do you manage cluster replication and failover ?

Hey, thanks for your feedbacks.

I do not know about Patroni. I will have a look at it.

Could someone confirm me that all features of pgpool (connection pooling + automatic failover) can be achieve using pgbouncer (connection pooling) + repmgr (automatic failover) ? Is it not overkill to user repmgr + pgpool ? Am I missing something ?

Robin.

________________________________
De : Lazaro Garcia <lazaro3487(at)gmail(dot)com>
Envoyé : vendredi 7 avril 2017 15:26:41
À : Robin LUCBERNET; pgsql-admin(at)postgresql(dot)org
Objet : RE: [ADMIN] How do you manage cluster replication and failover ?

You can use repmgr because it performs automatic failover, promotes a master mores closer to replica and follows other slaves to new master.

Then pgpool detects the new master promoted by repmgr.

Regards.

De: pgsql-admin-owner(at)postgresql(dot)org [mailto:pgsql-admin-owner(at)postgresql(dot)org] En nombre de Robin LUCBERNET
Enviado el: jueves, 6 de abril de 2017 05:18 a. m.
Para: pgsql-admin(at)postgresql(dot)org
Asunto: [ADMIN] How do you manage cluster replication and failover ?

Hello,

We are currently trying to setup a multi hosts databases cluster with goals:
* replication (no data-loss is "required", replication timing do not needs to be instant)
* failover
* load-balancing (bonus)

We tried:
* synchronious replication (pgpool replication mode) + load-balancing (pgpool) : very interesing as we can theorically failover on any node at any moment. But even after several configuraation tweeks, we never succeed getting good write performance.
* asynchronious replication (postgres 9.6 streaming replication) : good write performance, good replication timings (< 1 second for small transactions). We could loadbalance select requests using pgpool.

How do you manage your postgresql clusters ? Do you use pgpool ? pgbouncer ? other ?
How do you manage to single access point ? usign pgpool ? pgbouncer ?
Do you use streaming replication ? WAL archiving ? How do you handle to automatic failover ?

Robin