How to set up Streaming Replication in Postgres

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To set up streaming replication in PostgreSQL, you need to perform the following steps:

  1. Set up the master server and the standby server. The master server is the primary server that will receive all the write operations, while the standby server will receive a copy of all the changes made on the master server and will be used for failover in case the master server becomes unavailable.
  2. On the master server, edit the postgresql.conf configuration file and set the wal_level parameter to hot_standby. This will enable the master server to keep a sufficient amount of transaction log data (WAL) to allow the standby server to connect and apply the changes.
  3. Restart the master server for the changes to take effect.
  4. On the standby server, edit the postgresql.conf configuration file and set the hot_standby parameter to on. This will enable the standby server to connect to the master server and start receiving the changes.
  5. In the recovery.conf file on the standby server, add the following lines to specify the connection details for the master server:
standby_mode = 'on'
primary_conninfo = 'host=master_server_hostname port=5432 user=replication_user password=replication_password'

Replace master_server_hostname, replication_user, and replication_password with the actual hostname, username, and password of the master server and the user that will be used for replication.

  1. Restart the standby server for the changes to take effect. The standby server should now be able to connect to the master server and start receiving the changes.

Note that these are the basic steps for setting up streaming replication in PostgreSQL. There are many other factors to consider and configure, such as security, performance, and monitoring, to ensure that your replication setup is reliable and efficient. It is recommended to consult the PostgreSQL documentation and other resources to learn more about the details and best practices for setting up streaming replication in PostgreSQL.

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