10 Proven Methods to Optimize Ansible Playbook Performance

Introduction

Ansible, an open-source automation tool, simplifies IT infrastructure operations. Whether tackling simple package installations or orchestrating complex clustered solutions, optimizing Ansible playbooks is key to faster execution.

Step by Step

Here are ten methods to enhance Ansible Playbook performance:

1. Identify Slow Tasks with Callback Plugins in ansible.cfg:

• Use callback plugins like timer, profile_tasks, and profile_roles to assess task execution times. Configure ansible.cfg to enable these plugins and analyze task performance.
• https://docs.ansible.com/ansible/latest/collections/index_callback.html

2. Disable Fact Gathering in Playbook:

• Unless ansible_facts are utilized, disable fact gathering in playbooks with gather_facts: False. This improves performance, particularly in larger environments.

• https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_vars_facts.html

3. Configure Parallelism in ansible.cfg:

Adjust the forks setting in ansible.cfg to control task execution batches. Increasing forks from the default 5 allows more parallel task execution, speeding up playbooks.

• https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_strategies.html#setting-the-number-of-forks

4. Configure SSH Optimization in ansible.cfg:

• Implement ControlMaster and ControlPersist settings in ansible.cfg to reduce SSH connection overhead, enhancing efficiency.
• https://docs.ansible.com/ansible/latest/collections/ansible/builtin/ssh_connection.html

5. Disable SSH Host Key Checking in ansible.cfg:

• In controlled environments, disable SSH host key checking by setting host_key_checking to False in ansible.cfg. Exercise caution outside such environments.
• https://docs.ansible.com/ansible/latest/reference_appendices/config.html#host-key-checking

6. Enable Pipelining in ansible.cfg:

• Reduce SSH connections by enabling pipelining in ansible.cfg with pipelining = True.
• https://docs.ansible.com/ansible/latest/reference_appendices/config.html#ansible-pipelining

7. Utilize Execution Strategies in Playbook:

• Choose an appropriate strategy (e.g., free) to execute tasks without waiting for all hosts to complete their tasks, improving parallelism.
• https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_strategies.html#selecting-a-strategy

8. Use Async Tasks in Playbook:

• Employ async mode for long-running tasks, allowing Ansible to proceed with other tasks without waiting.
• https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_async.html

9. Setting the Batch Size with Serial in Playbook

• Use the serial statement to customize the batch size of hosts that are concurrently processed during playbook execution. This feature is particularly valuable in scenarios like rolling updates, where you want to limit the number of machines managed simultaneously. The serial value can be configured with specific host counts, percentages, or a mix of both, providing flexibility in optimizing task execution. It allows users to fine-tune the scope of failures, ensuring that issues are isolated to individual batches rather than affecting the entire host list. This capability enhances playbook performance and control in diverse infrastructure automation scenarios.
• https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_strategies.html#setting-the-batch-size-with-serial

10. Use Paramiko in ansible.cfg

• Using Paramiko, the native Python SSH implementation, as a transport method in Ansible, especially on older platforms like RHEL6 and earlier without ControlPersist support in SSH, offers compatibility and efficiency benefits. Paramiko ensures faster and more efficient connections for users on these platforms, enhancing Ansible’s performance, and is seamlessly integrated into Ansible’s smart option for the transport option in the ansible.cfg, which automatically selects the appropriate transport method based on the controller’s OS and SSH versions, simplifying connection management in diverse environments.
• https://docs.ansible.com/ansible/latest/reference_appendices/config.html#default-transport

Conclusion

Optimizing Ansible playbooks is a continuous journey. Experiment with various configuration parameters to find the ideal combination for your infrastructure needs. Additional parameters like serial, throttle, and run_once offer further optimization options. Refer to Ansible documentation for comprehensive guidance tailored to your environment.

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