PgBouncer - HA Mode

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PgBouncer - HA Mode

Anjul Tyagi
Team,

we are using PgBouncer for connection pooling, now all are application is connecting database via PgBouncer. However I need suggestion, if some how VM goes down or something goes wrong with PgBouncer, how can we handle that situation. We observe that currently its a single point of failure for all application if PgBouncer goes down. 

Is there any kind of load balancer or replicate the PgBouncer ti manage the high availability?

Thanks in advance.
 
 
 

Regards,

Anjul TYAGI

 

ü Go Green


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Re: PgBouncer - HA Mode

Peter Eisentraut-6
On 2020-02-17 11:42, Anjul Tyagi wrote:
> we are using PgBouncer for connection pooling, now all are application
> is connecting database via PgBouncer. However I need suggestion, if some
> how VM goes down or something goes wrong with PgBouncer, how can we
> handle that situation. We observe that currently its a single point of
> failure for all application if PgBouncer goes down.
>
> Is there any kind of load balancer or replicate the PgBouncer ti manage
> the high availability?

A typical approach is to run several pgbouncer instances on separate
hosts and use a TCP/IP-level load balancer (e.g., hardware load balancer
or HAProxy) to route traffic.

--
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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Re: PgBouncer - HA Mode

soumitra
In reply to this post by Anjul Tyagi

PgBouncer does not have internal failover-host configuration nor detection. It is possible via some external tools:

  1. DNS reconfiguration - when ip behind DNS name is reconfigured, pgbouncer will reconnect to new server. This behaviour can be tuned via 2 config parameters - dns_max_ttl tunes lifetime for one hostname, and dns_zone_check_period tunes how often zone SOA will be queried for changes. If zone SOA record has changed, pgbouncer will re-query all hostnames under that zone.

  2. Write new host to config and let PgBouncer reload it - send SIGHUP or use RELOAD; command on console. PgBouncer will detect changed host config and reconnect to new server.

Or else 

You can go for haproxy 



Sent from my iPhone

On 17-Feb-2020, at 4:12 PM, Anjul Tyagi <[hidden email]> wrote:


Team,

we are using PgBouncer for connection pooling, now all are application is connecting database via PgBouncer. However I need suggestion, if some how VM goes down or something goes wrong with PgBouncer, how can we handle that situation. We observe that currently its a single point of failure for all application if PgBouncer goes down. 

Is there any kind of load balancer or replicate the PgBouncer ti manage the high availability?

Thanks in advance.
 
 
 

Regards,

Anjul TYAGI

 

ü Go Green


Soumitra Bhandary Postgres Database Administrator