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playbooks/append_to_cmdline_txt.md
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To create an Ansible playbook that appends the specified kernel parameters (`rootwait cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory`) to the `/boot/firmware/cmdline.txt` file only if they are not already present, you can use the `lineinfile` Ansible module.
Here's how the playbook can be written:
### Ansible Playbook (`append_cmdline.yml`):
```yaml
---
- name: Ensure required parameters are in /boot/firmware/cmdline.txt
hosts: raspberry_pi
become: yes
tasks:
- name: Append kernel parameters to cmdline.txt if not present
lineinfile:
path: /boot/firmware/cmdline.txt
line: "rootwait cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory"
insertafter: EOF
state: present
create: yes
backup: yes # This creates a backup of the file before making changes
notify:
- Reboot system
handlers:
- name: Reboot system
reboot:
msg: "Rebooting system to apply new kernel parameters"
reboot_timeout: 600
test_command: uptime
```
### Explanation of the Playbook:
- **`hosts: raspberry_pi`**: Targets the Raspberry Pi group from your inventory.
- **`become: yes`**: Ensures that the task runs with elevated privileges (sudo), which is necessary for modifying system files like `/boot/firmware/cmdline.txt`.
### Task:
- **`lineinfile` module**:
- `path: /boot/firmware/cmdline.txt`: This specifies the file to modify.
- `line`: This is the exact string to ensure is present in the file.
- `insertafter: EOF`: This ensures the line is appended at the end of the file if it is not already there.
- `state: present`: Ensures that the specified line exists in the file.
- `create: yes`: If the file doesn't exist, it will be created (though it's unlikely in this case because `/boot/firmware/cmdline.txt` should exist on a Raspberry Pi).
- `backup: yes`: This creates a backup of the file before modifying it (important for safety).
### Handler:
- **`Reboot system` handler**:
- This handler is triggered if the task changes the file (i.e., if it appends the line).
- It will reboot the Raspberry Pi to apply the changes, which often requires a reboot to take effect.
- `reboot_timeout: 600` specifies that the playbook will wait up to 600 seconds for the system to reboot successfully.
- `test_command: uptime` ensures that the system is back up and running after the reboot.
### To run the playbook:
1. Save the playbook to a file, e.g., `append_cmdline.yml`.
2. Run the playbook with the following command:
```bash
ansible-playbook -i inventory.ini append_cmdline.yml
```
This will ensure the specified parameters are added to `/boot/firmware/cmdline.txt` only if they are not already present and reboot the system if necessary. If you have any more questions or need further adjustments, feel free to ask!