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Handling a PostgresSQL Database Failover

Edge for Private Cloud v. 4.16.05

Perform the following during a PostgreSQL database failover:

  1. Stop apigee-postgresql on the current master if it is still running:
    > /<inst_root>/apigee/apigee-service/bin/apigee-service apigee-postgresql stop
  2. Go to standby node and invoke the following command to make it the master:
    > /<inst_root>/apigee/apigee-service/bin/apigee-service apigee-postgresql promote-standby-to-master IPorDNSofOldMaster

If old master is restored at some time in the future, make it a standby node:

  1. On the current master, edit the config file to set:
    PG_MASTER=IPorDNSofNewMaster
    PG_STANDBY=IPorDNSofOldMaster
  2. Enable replication on the new master:
    > /<inst_root>/apigee/apigee-service/bin/apigee-service apigee-postgresql setup-replication-on-master -f configFIle
  3. On the old master, edit the config file to set:
    PG_MASTER=IPorDNSofNewMaster
    PG_STANDBY=IPorDNSofOldMaster
  4. Stop apigee-postgresql on the old master:
    > /opt/apigee/apigee-service/bin/apigee-service apigee-postgresql stop
  5. On the old master, clean out any old Postgres data:
    > rm -rf /<inst_root>/apigee/data/apigee-postgresql/

    Note: If necessary, you can backup this data before deleting it.
  6. Configure the old master as a standby:
    > /<inst_root>/apigee/apigee-service/bin/apigee-service apigee-postgresql setup-replication-on-standby -f configFile
  7. On completion of replication, verify the replication status by issuing the following scripts on both servers. The system should display identical results on both servers to ensure a successful replication:
    1. On the master node, run:
      > /<inst_root>/apigee/apigee-service/bin/apigee-service apigee-postgresql postgres-check-master

      Validate that it says it is the master.
    2. On the standby node:
      > /<inst_root>/apigee/apigee-service/bin/apigee-service apigee-postgresql postgres-check-standby

      Validate that it says it is the standby.

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