PostgreSQL Database Replication Demo on Linux

15 minutes
  • 3 Learning Objectives

About this Hands-on Lab

In this lab you are working as a QA (Quality Assurance) engineer and have been tasked with confirming two PostgreSQL servers are correctly configured for Primary-Replica replication.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Connect to the Replica Server and Query It

Connect to the replica server using the psql client:

sudo -u postgres psql

Confirm that read-only queries work by listing the databases:

l

Run a write query, and confirm that it fails:

CREATE DATABASE DEMO;
Connect to the Primary Server and Query It

Connect to the primary server using the psql client:

sudo -u postgres psql

Confirm that write queries work:

CREATE DATABASE DEMO;
Query the Replica Server and Confirm Changes Made on Primary

Back on replica server, re-run the list database command.

l

Additional Resources

You will need to complete the following tasks to do this:

  1. Connect to the replica server and query it.
    • Connect to the replica server using the psql client to confirm that read-only queries work, and that write queries fail.
  2. Connect to the primary server and query it:
    • Connect to the primary server and confirm that write queries work.
  3. Query the replica server again and confirm the changes made on the primary server:
    • Connect again to the replica server and confirm the changes you made on the primary server took effect.

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