Re: Standby problem after restore_command Implementation - Mailing list pgsql-general

On 05-05-2015 11:22, Melvin Davidson wrote:

It's possible you have wal_keep_segments set too low. What happens is that the master will keep the wals ( in your case 20) after processing them, before sending them off to the great black hole in the network (deleting) and making them unavailable to the standby. Try increasing wal_keep_segments = 100.

On Tue, May 5, 2015 at 10:09 AM, Adrian Klaver <adrian.klaver@aklaver.com> wrote:

On 05/05/2015 07:05 AM, Edson F. Lidorio wrote:

CCing list.

Em 2015-05-05 10:45, Adrian Klaver escreveu:

On 05/03/2015 05:57 PM, Edson F. Lidorio wrote:

Hello, I'm having trouble on Standby after the implementation of the
restore_command. I performed all the settings and it worked normally
and after restart the slave server, started to generate errors in the
log of the slave:

So is that implying that you had the standby running without the restore_command?

I'm using Debian 8 with PostgreSQL 9.4.1 on x86_64-unknown-linux-gnu,
compiled by gcc-4.9. real (Debian 4.9.2-10) 4.9.2, 64-bit Slave error
log: 5/3/2015 16:46:01 BRT [10210-1] @ Replicator [unknown] error:
WAL segment requested 00000001000000000000002C has been removed
5/3/2015 16:46:05 BRT [10211-1] @ Replicator [unknown] error: WAL
segment requested 00000001000000000000002C has been removed 5/3/2015
16:46:10 BRT [10214-1] @ Replicator [unknown] error: WAL segment
requested 00000001000000000000002C has been removed 5/3/2015 16:46:15
BRT [10216-1] @ Replicator [unknown] error: WAL segment requested
00000001000000000000002C has been removed Master error log 5/3/2015
19:13:35 BRT [3339-1] @ Replicator [unknown] error: WAL segment
requested 00000001000000000000002C has been removed 5/3/2015 19:13:40
BRT [3341-1] @ Replicator [unknown] error: WAL segment requested
00000001000000000000002C has been removed 5/3/2015 19:13:44 BRT
[3343-1] @ Replicator [unknown] error: WAL segment requested
00000001000000000000002C has been removed Settings files are as
follows: master postgresql.conf listen_addresses = '*' wal_level =
hot_standby archive_mode = on archive_command = 'cp "%p"
/mnt/server/archivedir/"%f"' max_wal_senders = 2 wal_keep_segments =
20 pg_hba.conf host replication replicador 192.168.0.112/32 trust
secondary postgresql.conf listen_addresses = '*' hot_standby = on
pg_hba.conf host all all 0.0.0.0/0 md5 recover.conf em
(/var/lib/postgresql/9.4/main) standby_mode=on
primary_conninfo='host=192.168.0.100 user=replicador
application_name= jessie-stby' trigger_file='/tmp/pgtrigger'
restore_command = 'cp /mnt/server/archivedir/%f %p'
archive_cleanup_command = 'pg_archivecleanup /mnt/server/archivedir %r'

--
Adrian Klaver

adrian.klaver@aklaver.com  <mailto:adrian.klaver@aklaver.com>

Yes,
It was working.

So what steps did you take to go from streaming only to streaming and archiving?

I suspect there was a gap in the stop/restart that allowed a WAL file to get recycled before the archiving started.

--
Adrian Klaver
adrian.klaver@aklaver.com


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Melvin Davidson
I reserve the right to fantasize.  Whether or not you
wish to share my fantasy is entirely up to you.

Increased the wal_keep_segments = 100 and keeps popping up the same message:

A question that I have!

as the slave server can see this folder in the master?

/mnt/server/archivedir/

Sorry my doubts I'm basic beginner!