Re: pg_standby / WAL archive-restore through system restarts

David Wall a écrit :
> [...]
> During regular operations, Server A and Server B may independently need
> to be rebooted or postgresql restarted, etc. Is there any sync-ing
> between Server A and Server B I have to worry about when doing this?
> That is, will Server B need to know anything about the fact that the
> postmaster on Server A going up and down?

Server B doesn't need to know anything.

> Will it just run normally,
> waiting for the restarted Server A to send over new WAL archives?
>

Yes, it will. Anyways, be careful on the command line options you use
with pg_standby.

> Can I shutdown Server B simply by killing the postmaster and restart it
> back in recovery mode to continue re-syncing where it left off? Or does
> stopping Server B in recovery mode require any manual re-sync steps
> before it can resume recovery?
>

I think you'll need to redo the whole process : restore the full data
backup, create the recovery.conf file, etc.

> If I ever tell Server B to stop recovery (assuming I didn't intend for
> it to become the new primary), I cannot just resume recovery mode unless
> I do the full data backup again from Server A and restore on Server B in
> start in recovery mode. That is, once you tell PG to end recovery, it
> becomes a primary and no longer can resume recovery mode without redoing
> the recovery setup steps.
>

Correct.

--
Guillaume.
http://www.postgresqlfr.org
http://dalibo.com