Re: [ADMIN] postgres streaming replication for HA
| От | Sunil N Shinde |
|---|---|
| Тема | Re: [ADMIN] postgres streaming replication for HA |
| Дата | |
| Msg-id | HK2PR0601MB1873CF5A94020A5373A7AD00EE950@HK2PR0601MB1873.apcprd06.prod.outlook.com обсуждение исходный текст |
| Ответ на | Re: [ADMIN] postgres streaming replication for HA (Sunil N Shinde <Sunil.Shinde@mastek.com>) |
| Ответы |
Re: [ADMIN] postgres streaming replication for HA
|
| Список | pgsql-admin |
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
From: pgsql-admin-owner@postgresql.org [mailto:pgsql-admin-owner@postgresql.org] On Behalf Of Sunil N Shinde
Sent: 08 September 2017 12:38
To: Samed YILDIRIM <samed@reddoc.net>; pgsql-admin@postgresql.org
Subject: Re: [ADMIN] postgres streaming replication for HA
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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@reddoc.net]
Sent: 08 September 2017 12:22
To: pgsql-admin@postgresql.org; Sunil N Shinde <Sunil.Shinde@mastek.com>
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?
Best regards.
--
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08:51, 8 Eylül 2017, Sunil N Shinde <sunil.shinde@mastek.com>:
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
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