Monitoring Oracle Servers With Checkmk

This tutorial demonstrates how to monitor an Oracle database using Checkmk, a versatile IT monitoring tool. Checkmk simplifies the process, offering pre-configured Oracle monitoring that requires minimal setup. This proactive approach ensures optimal database performance and reveals optimization opportunities.

Prerequisites:

A functioning Checkmk site (this example uses Checkmk Free Edition 2.1.0p19 on Ubuntu 20.04, but Checkmk supports various platforms and deployment methods). An Oracle database server (this example uses version 19.0 on Rocky Linux 9.0). No prior Oracle monitoring experience is needed.

Step 1: Creating an Oracle User Account

Create a dedicated Oracle user account for Checkmk to access monitoring data. This example uses SQL*Plus:

1. Switch to the Oracle user: su - oracle
2. Connect as sysdba: sqlplus / as sysdba
3. Create the Checkmk user (replace MySecurePassword with a strong password): create user checkmk identified by MySecurePassword
4. Grant necessary privileges: grant select_catalog_role to checkmk; grant create session to checkmk;
5. Test the connection: connect checkmk/MySecurePassword

Step 2: Configuring the Oracle Monitoring Rule in Checkmk

Use Checkmk's Agent Bakery (not available in the Raw Edition; for Raw Edition, consult the Checkmk documentation) to create an agent:

1. In Checkmk, navigate to Setup, search for "oracle database," and select "ORACLE databases (Linux, Solaris, AIX, Windows)."
2. Click Add rule.
3. Activate the rule (Activation checkbox), selecting "Deploy ORACLE database plugin."
4. If using systemd (as in this example), select "Host uses xinetd or systemd (Linux/AIX/Solaris only)" and choose "systemd." Maintain the default one-minute interval.
5. Under Login Defaults, provide the newly created Checkmk user credentials.
6. Click Save.

Step 3: Baking and Installing the Checkmk Agent

1. In Checkmk, go to Setup, then Windows, Linux, Solaris, AIX, and click Bake agents.
2. Download the appropriate agent package (e.g., RPM).
3. Install the package on the Oracle server (e.g., using sudo dnf install check-mk-agent-2.1.0p19-0a8bd97002c9f415.noarch.rpm).

Step 4: Adding the Oracle Server to Checkmk

1. In Checkmk, go to Setup, then Host, and click Add host.
2. Enter the Oracle server hostname (or IP address if DNS resolution is unavailable).
3. Click Save & go to service configuration.
4. Wait for service detection and click Accept all.
5. Activate the changes.

Now your Oracle database is being monitored. View the monitoring data in the Monitor section.

Further Considerations:

This is a basic setup. Consider monitoring server hardware and exploring Checkmk's advanced configuration options. For remote database monitoring and other advanced topics, refer to the Checkmk documentation.

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