How to Rebuid the standalone postgres slave server ?

  • Posted by 2ndnijam
  • Date December 16, 2018

If slave Connection is Broken form master due to network issue or some some data mismatch so we have to rebuild the slave server by following below six steps .

TO REBUILD THE STANDBY SERVER BY FOLLOWING THE SIMPLE 6 STEPS :

  • Current Master : 10.100.128.82
  • Current Slave Server : 10.100.128.81 ( Slave Connection is broken from master )

1. Stop the slave server:
/opt/edb/as9.6/bin/pg_ctl -D /opt/edb/as9.6/data stop

2. Create recovery.conf file if not exist on slave server then update the the new master information in primary_connection field

Make sure your recovery.conf matches your environment

standby_mode = 'on'
primary_conninfo='host=10.100.128.82 port=5444 user=replica password=tcs@12345 application_name=pgslave001'
restore_command = 'cp /opt/edb/as9.6/data/archive/%f "%p"'
trigger_file = '/tmp/postgresql.trigger.5444'

3. Take the incremental backup From new postgres master Server:

/opt/edb/as9.6/bin/psql -d edb -c "select pg_start_backup('initial_backup');"
rsync -cva --inplace --exclude recovery.conf --exclude recovery.done --exclude pg_hba.conf --exclude postgresql.conf /opt/edb/as9.6/data/ enterprisedb@10.100.128.81:/opt/edb/as9.6/data/
/opt/edb/as9.6/bin/psql -d edb -c "select pg_stop_backup();"

4. restarting new slave server:

[root@2ndquadrant.in-1]# /opt/edb/as9.6/bin/pg_ctl -D /opt/edb/as9.6/data start

MASTER:

[root@2ndquadrant.in-1]# ps -ef|grep receiver
enterpr+ 31404 25252 0 12:41 ? 00:00:00 postgres: wal sender process replica 10.11.128.81[36570] streaming 0/26000220
root 31840 31656 0 12:54 pts/0 00:00:00 grep --color=auto sender

SLAVE :

[root@2ndquadrant.in-2]# ps -ef|grep receiver
enterpr+ 23187 23180 0 12:41 ? 00:00:00 postgres: wal receiver process streaming 0/26000220
root 24411 23650 0 12:53 pts/0 00:00:00 grep --color=auto receiver

Now  master and slave streaming connectivity is happened successfully . For IT Support or want to talk regarding for project please touch with US support@2ndquadrant.in.

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