On Fri, 2012-04-27 at 16:25 -0700, Lonni J Friedman wrote:
> Greetings,
> I'm running postgresql-9.1.3 on a Linux-x86_64 (Fedora16, if it
> matters) system. I noticed the existence of pg_basebackup starting in
> 9.1, and figured I'd try it out and see if it would simplify our
> backup & management processes.
>
> $ pg_basebackup -P -v -D /tmp/backup -x -Ft -z -U postgres
> xlog start point: C6/64000020
> 135733616/135733616 kB (100%), 1/1 tablespace
> xlog end point: C6/640000A0
> pg_basebackup: base backup completed
>
> So after running through this, I tried to use (restore) the backup
> that was generated. While everything appears to be working ok from a
> functional perspective, in the server log I saw the following:
> ######
> LOG: creating missing WAL directory "pg_xlog/archive_status"
> LOG: database system was not properly shut down; automatic recovery in progress
> LOG: redo starts at C6/66000078
> LOG: could not open file "pg_xlog/00000001000000C600000067" (log file
> 198, segment 103): No such file or directory
> LOG: redo done at C6/660000A0
> FATAL: the database system is starting up
> LOG: autovacuum launcher started
> LOG: database system is ready to accept connections
> #####
>
> Just to be clear, here's what I did after pg_basebackup had completed
> successfully:
> 0) shutdown postgresql gracefully, and verified that it was fully shutdown
> 1) moved $PGDATA to $PGDATA.old
> 2) created $PGDATA as postgres user
> 3) extracted the basebackup tarball as postgres user
> cd $PGDATA && tar xzvpf /tmp/backup/base.tar.gz
> 4) started postgresql up
>
> I would have expected that I wouldn't have gotten the 'not properly
> shutdown' warning, or the 'could not open file' warning by following
> this process. Am I doing something wrong?
>
No, I think you did right. The first error message is right: you didn't
stop PostgreSQL. You were right not to stop it, but PostgreSQL is right
to say that it wasn't stopped, and that it has to replay some logs (if
there was some activity during the backup). The second error message
says that this specific wal file is not available and thus it has
nothing more to replay. Seems good to me.
--
Guillaume
http://blog.guillaume.lelarge.info
http://www.dalibo.com