Testing: DB2 Scenarios
Relevant source files
The following files were used as context for generating this wiki page:
Introduction
The DB2 testing scenarios within the SPM Middleware project are designed to automate the installation, configuration, and verification of IBM DB2 servers specifically for use with the Curam Social Program Management Platform. These tests utilize the Molecule framework to ensure that the Ansible roles are idempotent and function correctly across supported Linux distributions like RHEL and Rocky Linux.
Sources: roles/db2/meta/main.yml:3-6, CONTRIBUTING.md:120-123
Testing focuses on the full lifecycle of a DB2 deployment, including prerequisite checks, user/group creation, software installation via response files, license activation, and database creation. By using Molecule, developers can spin up ephemeral Docker containers to execute these scenarios in a reproducible environment.
Sources: roles/db2/tasks/main.yml:1-40, CONTRIBUTING.md:65-70
Testing Infrastructure and Environment
Testing is conducted using a Python-based virtual environment or a specialized Molecule Docker container (DinD). This ensures that the testing environment is isolated and contains all necessary dependencies like Ansible, Molecule, and the Ansible-lint tool.
Sources: CONTRIBUTING.md:1-10, CONTRIBUTING.md:41-45
Execution Flow
The following diagram illustrates the high-level execution flow when running a DB2 Molecule test scenario:
The testing lifecycle ensures that the role can be applied multiple times without causing errors (idempotency) and that the final state matches the expected configuration.
Sources: CONTRIBUTING.md:21-25, roles/db2/tasks/main.yml:1-40
DB2 Role Logic and Configuration
The DB2 role follows a structured set of tasks to transition the system from a clean state to a fully functional database server.
Installation and Setup Components
The installation process relies on a combination of response files and system-level configurations.
| Component | Description | Source |
|---|---|---|
| Response File | db2server.rsp rendered from a Jinja2 template for silent installation. | roles/db2/tasks/install.yml:50-54 |
| Identity Management | Creation of groups (db2_db_groupname, dasadm1) and users (db2_db_username). | roles/db2/tasks/install.yml:56-74 |
| Prerequisite Check | Execution of db2prereqcheck to validate system readiness before setup. | roles/db2/tasks/install.yml:44-48 |
| Workarounds | Special handling for Rocky Linux to fix AWS SDK library symbolic links. | roles/db2/tasks/install.yml:83-125 |
Provisioning Sequence
The sequence of tasks within the DB2 role is strictly ordered to handle dependencies correctly.
Automated Verification
Verification is the final stage of the testing scenario. While specific verify playbooks vary by version (e.g., db2115), the project standardizes on using the assert module to validate the deployment.
Key Verification Points
- Package Presence: Ensuring the DB2 binaries are present in the expected installation path.
- Database Connectivity: Verifying that the database defined in
db2_db_nameis listed in the system directory. - Version Accuracy: Matching the
db2leveloutput against the requested version variables.
Sources: roles/db2/tasks/main.yml:25-30, CONTRIBUTING.md:120-125
Usage Examples
To run the specific DB2 scenarios locally, the following commands are used within the project environment:
# Run the DB2 11.5 scenario on Rocky Linux 8
molecule test -s db2-115-rockylinux8
# Run test and keep container for debugging
molecule test -s db2-115-rockylinux8 --destroy never
Sources: CONTRIBUTING.md:33, CONTRIBUTING.md:65-70
Conclusion
Testing DB2 scenarios in this project provides a robust validation framework for middleware automation. By integrating Molecule with detailed Ansible tasks—ranging from OS-level user provisioning to specialized Rocky Linux library patching—the system ensures that the DB2 environment is consistently ready for the Curam Social Program Management Platform.