Multi-Region Keycloak Deployment: Database DR Configuration
In this article, we will discuss how to configure Database DR (Disaster Recovery) for a multi-region Keycloak deployment. Keycloak is an open-source identity and access management solution. By following this guide, you will be able to ensure high availability and disaster recovery for your Keycloak application.
Key Concepts:
Multi-region deployment: In a multi-region deployment, Keycloak is deployed across multiple regions or data centers to provide better performance, availability, and disaster recovery capabilities. This can be achieved by setting up load balancers, read replicas, and other infrastructure components.
Database DR: Database DR involves creating a standby database in a different region or data center to take over in case of a disaster. This can be implemented using various strategies such as log shipping, database replication, or backup and restore.
Prerequisites:
To follow this guide, you should have:
- A deployed Keycloak instance in Region 1 using a PostgreSQL flexible server on Azure
- A second region (Region 2) for deploying the DR environment
- A PostgreSQL flexible server in Region 2
Configuration Steps:
Step 1: Configure the Azure PostgreSQL Server in Region 2
Create a new PostgreSQL flexible server in Region 2 with the same configuration as the one in Region 1. Ensure that the PostgreSQL version is identical in both regions. This step is crucial because incompatibilities in PostgreSQL versions might cause issues during migration and replication.
Step 2: Set Up Replication
To set up replication between the two PostgreSQL servers, first, create a replication user on the primary server (Region 1) using the following SQL command:
CREATE USER replication WITH REPLICATION ENCRYPTED PASSWORD 'your-password';
GRANT ALL PRIVILEGES ON DATABASE your-database TO replication;Then, create a new PG logical replication slot named keycloak-rep-slot using the following command:
SELECT * FROM pg_create_logical_replication_slot('keycloak-rep-slot', 'replication', 'minval', 'include-xids', 'logical');Step 3: Modify Keycloak Configuration
To allow Keycloak to connect to both primary and standby servers, modify the standalone.xml or jboss-clustering.xml file to include the following settings:
<datasource jndi-name="java:jboss/datasources/KeycloakDS" pool-name="KeycloakDS" enabled="true" use-ccm="false" tracking="false">
...
<connection-url>jdbc:postgresql://primary-server-url:5432/keycloak?sslmode=require</connection-url>
<validation>
<valid-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.postgres.PostgreSQLValidConnectionChecker"/>
<background-validation>true</background-validation>
<background-validation-millis>60000</background-validation-millis>
<stale-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.postgres.PostgreSQLStaleConnectionChecker"/>
<stale-connection-checker-timeout>30000</stale-connection-checker-timeout>
<exception-sorter class-name="org.jboss.jca.adapters.jdbc.extensions.postgres.PostgreSQLExceptionSorter">
<detect-sql-error-params>false</detect-sql-error-params>
<jdbc-interceptors>
<interceptor class-name="org.jboss.jca.adapters.jdbc.JDBCConnectionInterceptor"/>
<interceptor class-name="org.jboss.jca.adapters.jdbc.JDBCInvocationInterceptor"/>
<interceptor class-name="org.jboss.jca.adapters.jdbc.LoggingInterceptor"/>
<interceptor-class-name>
org.jboss.jca.adapters.jdbc.extensions.postgres.PGPoolInterceptorFactory
</interceptor-class-name>
</jdbc-interceptors>
</exception-sorter>
</validation>
...
<recovery-username>replication</recovery-username>
<recovery-password>your-password</recovery-password>
<allow-multiple-users>true</allow-multiple-users>
<connections>
<connection>
<pool-name>KeycloakDS</pool-name>
<connection-url>jdbc:postgresql://standby-server-url:5432/keycloak?sslmode=require</connection-url>
...
</connection>
</connections>
</datasource>Replace primary-server-url and standby-server-url with the actual URLs of your PostgreSQL Primary and Standby servers. This configuration allows the Keycloak application to connect to both servers and failover when needed.
In this article, we covered the key concepts of multi-region Keycloak deployment and Database DR configuration. We discussed how toconfigure replication and modify the Keycloak configuration to support multiple databases. By implementing these steps, you will achieve better availability, scalability, and disaster recovery capabilities for your Keycloak deployment.