Re: [ADMIN] postgres streaming replication for HA

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