Hi Samed,
Thanks a lot. Will try this.
Please find below the contents of recovery.conf file.
standby_mode = 'on'
primary_conninfo = 'host=*.*.*.* port=5432 user=replica password=***** application_name=****'
restore_command = 'cp /var/lib/pgsql/9.6/data/archive/%f %p'
trigger_file = '/tmp/postgresql.trigger.5432'
recovery_target_timeline = 'latest'
I have tried below steps. Can you please tell me whether this is right way?
1.
Brought down master node.
2.
Copied missing archive logs from master to slave.
3.
On slave --- touch /tmp/postgresql.trigger.5432 --- Hence it has became NEW MASTER.
4.
On old master --- rm /tmp/postgresql.trigger.5432 & addred recovery.conf file with old slave’s connectinfo --- Hence
it has become NEW SLAVE.
Thanks & Regards,
Sunil N Shinde
Assistant Manager – DBA
Mastek Ltd | Mastek Millennium Center, Millennium Business Park, Mahape, Navi Mumbai-400710 .
Mob:- 9819002393
From: Samed YILDIRIM [mailto:samed@xxxxxxxxxx]
Sent: 08 September 2017 16:25
To: Sunil N Shinde <Sunil.Shinde@xxxxxxxxxx>; pgsql-admin@xxxxxxxxxxxxxx
Subject: Re: [ADMIN] postgres streaming replication for HA
Could you please share recovery.conf file?
Logs means that xlog file (000000030000000000000013) which is required by your standby has been removed before streamed to standby. To avoid this kind of situations you can use replication slot or you should set wal_keep_segment high enough.
Hi Samed,
Please find below the log details also :
cp: cannot stat ‘/var/lib/pgsql/9.6/data/archive/000000030000000000000013’: No such file or directory
< 2017-09-08 08:36:25.852 UTC > LOG: started streaming WAL from primary at 0/13000000 on timeline 3
< 2017-09-08 08:36:25.852 UTC > FATAL: could not receive data from WAL stream: ERROR: requested starting point 0/13000000 is ahead of the WAL flush position of this server 0/1102FFF0
Thanks & Regards,
Sunil N Shinde
Assistant Manager – DBA
Mastek Ltd | Mastek Millennium Center, Millennium Business Park, Mahape, Navi Mumbai-400710 .
Mob:- 9819002393
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Hi Samed,
Thanks for the quick reply.
I am trying it manually with below step:
1.
Shut down the primary node
2.
Creating trigger file on standby node before promoting it to primay.
3.
"recovery_target_timline='latest'” adding this parameter in recovery file on standby and restarting it.
On current standby :
psql -p 5432 -c "select pg_is_in_recovery();"
pg_is_in_recovery
-------------------
t
(1 row)
But on Current Primary:
psql -c "select application_name, state, sync_priority, sync_state from pg_stat_replication;"
application_name | state | sync_priority | sync_state
------------------+-------+---------------+------------
(0 rows)
Thanks & Regards,
Sunil N Shinde
From: Samed YILDIRIM [mailto:samed@xxxxxxxxxx]
Sent: 08 September 2017 12:22
To:
pgsql-admin@xxxxxxxxxxxxxx; Sunil N Shinde <Sunil.Shinde@xxxxxxxxxx>
Subject: Re: [ADMIN] postgres streaming replication for HA
Hi Shinde,
Do you trying swithover manually? Or do you use any manager or script to handle switchover operation?
--
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08:51, 8 Eylül 2017, Sunil N Shinde <sunil.shinde@xxxxxxxxxx>:
Hi,
I am forming 2 node cluster of streaming replication for HA. I could able to succeed with the replication process.
But I am not able to complete the “switchover”.
Version : postgresql-9.6
OS :RHEL7
Master Node Parameters:
wal_level = hot_standby
synchronous_commit = local
archive_mode = on
archive_command = 'cp %p /var/lib/pgsql/9.6/data/archive/%f'
max_wal_senders = 2
wal_keep_segments = 10
synchronous_standby_names = 'UWPGRECLUS2'
pb_hba.conf
# Localhost
host replication replica 127.0.0.1/32 md5
# PostgreSQL Master IP address
host replication replica 10.0.3.4/32 md5
# PostgreSQL SLave IP address
host replication replica 10.0.3.5/32 md5
Slave Node Parameters:
wal_level = hot_standby
synchronous_commit = local
max_wal_senders = 2
wal_keep_segments = 10
synchronous_standby_names = 'UWPGRECLUS2'
hot_standby = on
Replication is properly happening from master to slave. But I am not able to switchover between the nodes.
Can anyone please guide me in this regard?
Thanks & Regards,
Sunil N Shinde
Assistant Manager – DBA
Mastek Ltd | Mastek Millennium Center, Millennium Business Park, Mahape, Navi Mumbai-400710 .
Mob:- 9819002393
