On 18/06/2015 04:00, Sameer Kumar wrote:
On Wed, 17 Jun 2015 15:24 Xavier 12 <mania...@gmail.com
<mailto:mania...@gmail.com>> wrote:
On 17/06/2015 03:17, Sameer Kumar wrote:
On Tue, 16 Jun 2015 16:55 Xavier 12 <mania...@gmail.com
<mailto:mania...@gmail.com>> wrote:
Hi everyone,
Questions about pg_xlogs again...
I have two Postgresql 9.1 servers in a master/slave stream
replication
(hot_standby).
Psql01 (master) is backuped with Barman and pg_xlogs is
correctly
purged (archive_command is used).
Hower, Psql02 (slave) has a huge pg_xlog (951 files, 15G
for 7 days
only, it keeps growing up until disk space is full). I
have found
documentation and tutorials, mailing list, but I don't
know what is
suitable for a Slave. Leads I've found :
- checkpoints
- archive_command
- archive_cleanup
Master postgresq.conf :
[...]
wal_level = 'hot_standby'
archive_mode = on
archive_command = 'rsync -az
/var/lib/postgresql/9.1/main/pg_xlog/%f
bar...@nas.lan:/data/pgbarman/psql01/incoming/%f
<mailto:bar...@nas.lan:/data/pgbarman/psql01/incoming/%25f>'
max_wal_senders = 5
wal_keep_segments = 64
What's this parameter's value on Slave?
Hm... You have a point.
That autovacuum parameter seems to be useless on a slave.
I'll try to remove it and check pg_xlog.
That was not my point. I was actually asking about wal_keep_segment.
Nevermind I found that I had misses the info (found it below. Please
see my response).
Besides I try to keep my master and standby config as same as
possible(so my advise ia to not switchoff autovacuum). The parameters
which are imeffective on slave anyways won't have an effect. Same goes
for parameters on master.
This helps me when I swap roles or do a failover. I have less
parameters to be worried about.
Okay
Can you check the pg_log for log files. They may have se info? I am
sorry if you have already provided that info (after I finish I will
try to look at your previous emails on this thread)
Nothing...
/var/log/postgresql/postgresql-2015-06-17_111131.log is empty (except
old messages at the begining related to a configuration issue - which is
now solved - after rebuilding the cluster yesterday).
/var/log/syslog has nothing but these :
Jun 18 09:10:11 Bdd02 postgres[28400]: [2-1] 2015-06-18 09:10:11 CEST
LOG: paquet de d?marrage incomplet
Jun 18 09:10:41 Bdd02 postgres[28523]: [2-1] 2015-06-18 09:10:41 CEST
LOG: paquet de d?marrage incomplet
Jun 18 09:11:11 Bdd02 postgres[28557]: [2-1] 2015-06-18 09:11:11 CEST
LOG: paquet de d?marrage incomplet
Jun 18 09:11:41 Bdd02 postgres[28652]: [2-1] 2015-06-18 09:11:41 CEST
LOG: paquet de d?marrage incomplet
Jun 18 09:12:11 Bdd02 postgres[28752]: [2-1] 2015-06-18 09:12:11 CEST
LOG: paquet de d?marrage incomplet
Jun 18 09:12:41 Bdd02 postgres[28862]: [2-1] 2015-06-18 09:12:41 CEST
LOG: paquet de d?marrage incomplet
Jun 18 09:13:11 Bdd02 postgres[28891]: [2-1] 2015-06-18 09:13:11 CEST
LOG: paquet de d?marrage incomplet
Jun 18 09:13:40 Bdd02 postgres[28987]: [2-1] 2015-06-18 09:13:40 CEST
LOG: paquet de d?marrage incomplet
These messages are related to Zabbix (psql port check).
Also can you share the vacuum cost parameters in your environment?
I don't understand that part... is this in postgresql.conf ?
autovacuum = on
Slave postgresql.conf :
[...]
wal_level = minimal
wal_keep_segments = 32
Sorry I missed this somehow earlier. Any reason why you think you need
to retain 32 wal files on slave?
No but I get the feeling that the parameter is ignored by my slave...
should I try another value ?
hot_standby = on
Slave recovery.conf :
standby_mode = 'on'
primary_conninfo = 'host=10.0.0.1 port=5400 user=postgres'
trigger_file = '/var/lib/postgresql/9.1/triggersql'
restore_command='cp /var/lib/postgresql/9.1/wal_archive/%f
"%p"'
archive_cleanup_command =
'/usr/lib/postgresql/9.1/bin/pg_archivecleanup
/var/lib/postgresql/9.1/wal_archive/ %r'
Also consider setting hot_standby_feesback to on.
I will check that parameter in the documentation,
Thanks
How can I reduce the number of WAL files on the hot_stanby
slave ?
Thanks
Regards.
Xavier C.
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