Re: Restart replicated slave procedure

Joseph Kregloh <jkregloh(at)sproutloud(dot)com> writes:

> Hi,
>
> Currently I am doing asynchronous replication from master to
> slave. Now if I restart the slave it will fall out of sync with the
> master. Is there a correct procedure or set of steps to avoid this? I
> am looking for best practices or suggestions. Whenever my slave fell
> out of sync I would either issue a new pg_base_backup() or set the
> master to pg_start_backup() do an rsync and stop using
> pg_stop_backup(). If there is a way to avoid any of that, for example
> pause replication to hold all the wal files until the replicated slave
> comes back and then release them once the replicated slave is up.
>
> I apologize if this question has already been asked. I did some searching beforehand.

See the manual and read up on the 2 GUCs; archive_command and wal_keep_segments.

wal_keep_segments lets you hold a configurable number of WAL segments
back and buy some more time till you have to resync the stand bys.

Setting archive_command to '' or something like '/bin/false' lets you
delay archiving forever till you change them back again and/or fill
whatever file system pg_xlog writes to :-)

>
> Thanks,
> -Joseph Kregloh
>

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Jerry Sievers
Postgres DBA/Development Consulting
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