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bootloader

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Ansible role for bootloader and kernel command line management

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# bootloader

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An Ansible role for bootloader and kernel command line management.

## Supported architectures

This role currently supports configuring `grub2` boot loader which runs on the following architectures:

* AMD and Intel 64-bit architectures (x86-64)
* The 64-bit ARM architecture (ARMv8.0)
* IBM Power Systems, Little Endian (POWER9)

## Requirements

See below

### Collection requirements

If you don't want to manage `ostree` systems, the role has no requirements.

If you want to manage `ostree` systems, the role requires additional modules
from external collections.  Please use the following command to install them:

```bash
ansible-galaxy collection install -vv -r meta/collection-requirements.yml
```

## Considerations

Since Fedora 42, or grubby-8.40-82.fc42.x86_64, there is a bug [BZ#2361624](https://bugzilla.redhat.com/show_bug.cgi?id=2361624) that causes the default kernel to change to a newly added kernel.
You can ensure that a particular kernel is booted by setting the `default: true` entry for the kernel within the [bootloader_settings](#bootloader_settings) variable.

## Role Variables

### bootloader_gather_facts

Whether to gather [bootloader_facts](#bootloader_facts) that contain boot information for all kernels.

Default: `false`

Type: `bool`

### bootloader_settings

Use this variable to list kernels and their command line parameters.

Available keys:

1. `kernel` - with this, specify the kernel to update settings for.
Each entry should specify a kernel using one or more keys.

If you want to add a kernel, you must specify three keys: `path`, `title`, `initrd`.

If you want to modify or remove a kernel, you can specify one or more keys.

You can also specify `DEFAULT` or `ALL` to update the default or all kernels.

Available keys:
    * `path` - kernel path
    * `index` - kernel index
    * `title` - kernel title
    * `initrd` - kernel initrd image

Available strings:
    * `DEFAULT` - to update the default entry
    * `ALL` - to update all of the entries

2. `state` - state of the kernel.

Available values: `present`, `absent`

Default: `present`

3. `options` - use this to specify settings to update

* `name` - The name of the setting. Omit `name` when using `replaced`.
    * `value` - The value for the setting. You must omit `value` if the setting has no value, e.g. `quiet`.
      **NOTE** - a value must not be [YAML bool type](https://yaml.org/type/bool.html).
      One situation where this might be a problem is using `value: on` or other
      YAML `bool` typed value.  You must quote these values, or otherwise pass
      them as a value of `str` type e.g.  `value: "on"`.  The same applies to `null` values.
      If you specify a value, it must not be `null` - values such as `value:` or `value: ~`
      or `value: null` are not allowed and will raise an error.
    * `state` - `present` (default) or `absent`. The value `absent` means to remove a setting with the given `name` - the name must be provided.
    * `previous` - Optional - the only supported value is `replaced` - use this to specify that the previous settings should be replaced with the given settings.
    * `copy_default` - Optional - when creating a kernel, you can specify `copy_default: true` to copy the default arguments to the created kernel.

4. `default` - boolean that identifies whether to make this kernel the default.
By default, the role does not change the default kernel.

For an example, see [Example Playbook](#example-playbook).

Default: `{}`

Type: `dict`

### bootloader_timeout

Use this variable to customize the loading time of the GRUB bootloader.

Usually the native setting for timeout is `5`.

When this variable is not set by a user, the role doesn't change the timeout setting.

Default: `null`

Type: `int`

### bootloader_password

Use this variable to protect boot parameters with a password.

**WARNING**: Changing the bootloader password is not idempotent.

The bootloader username is always `root`.

This should come from vault.

If unset, current configuration is not touched.

Default: `null`

Type: `string`

### bootloader_remove_password

Set this variable to `true` to remove the bootloader password.

Default: `false`

Type: `bool`

### bootloader_reboot_ok

If `true`, the role will reboot the managed host when it detects that changes require a reboot to take effect.

If `false`, it is up to you to determine when to reboot the managed host.

The role will return the variable `bootloader_reboot_required` (see below) with a value of `true` to indicate that changes have occurred which need a reboot to take effect.

Default: `false`

Type: `bool`

### bootloader_secure_logging

If `true`, suppress potentially sensitive output from tasks that handle
credentials, secrets, and other sensitive data by setting `no_log: true` on
those tasks. This prevents passwords, API tokens, private keys, and similar
sensitive information from appearing in Ansible logs and console output.

If you need to debug issues with credential handling or secret management, you
can temporarily set `bootloader_secure_logging: false` to see the full output from
these tasks. However, be aware that this may expose sensitive information in
logs, so it should only be used in development or troubleshooting scenarios.

Default: `true`

Type: `bool`

## Variables Exported by the Role

The role exports the following variables:

### bootloader_reboot_needed

Default: `false` - if `true`, this means a reboot is needed to apply the changes made by the role.

### bootloader_facts

Contains boot information for all kernels.

The role returns this variable when you set `bootloader_gather_facts: true`.

For example:

```yaml
"bootloader_facts": [
    {
        "args": "ro rootflags=subvol=root rd.luks.uuid=luks-9da1fdf5-14ac-49fd-a388-8b1ee48f3df1 rhgb quiet",
        "id": "luks-9da1fdf5-14ac-49fd-a388-8b1ee48f3df1 rhgb quiet",
        "index": "3",
        "initrd": "/boot/initramfs-0-rescue-c44543d15b2c4e898912c2497f734e67.img",
        "kernel": "/boot/vmlinuz-0-rescue-c44543d15b2c4e898912c2497f734e67",
        "root": "UUID=65c70529-e9ad-4778-9001-18fe8c525285",
        "title": "Fedora Linux (0-rescue-c44543d15b2c4e898912c2497f734e67) 36 (Workstation Edition)",
        "default": True
    },
    {
        "args": "ro rootflags=subvol=root rd.luks.uuid=luks-9da1fdf5-14ac-49fd-a388-8b1ee48f3df1 rhgb quiet $tuned_params",
        "id": "luks-9da1fdf5-14ac-49fd-a388-8b1ee48f3df1 rhgb quiet $tuned_params",
        "index": "2",
        "initrd": "/boot/initramfs-6.3.12-100.fc37.x86_64.img $tuned_initrd",
        "kernel": "/boot/vmlinuz-6.3.12-100.fc37.x86_64",
        "root": "UUID=65c70529-e9ad-4778-9001-18fe8c525285",
        "title": "Fedora Linux (6.3.12-100.fc37.x86_64) 37 (Workstation Edition)",
        "default": False
    },
    {
        "args": "ro rootflags=subvol=root rd.luks.uuid=luks-9da1fdf5-14ac-49fd-a388-8b1ee48f3df1 rhgb quiet $tuned_params",
        "id": "luks-9da1fdf5-14ac-49fd-a388-8b1ee48f3df1 rhgb quiet $tuned_params",
        "index": "1",
        "initrd": "/boot/initramfs-6.4.15-100.fc37.x86_64.img $tuned_initrd",
        "kernel": "/boot/vmlinuz-6.4.15-100.fc37.x86_64",
        "root": "UUID=65c70529-e9ad-4778-9001-18fe8c525285",
        "title": "Fedora Linux (6.4.15-100.fc37.x86_64) 37 (Workstation Edition)",
        "default": False
    },
    {
        "args": "ro rootflags=subvol=root rd.luks.uuid=luks-9da1fdf5-14ac-49fd-a388-8b1ee48f3df1 rhgb quiet $tuned_params",
        "id": "luks-9da1fdf5-14ac-49fd-a388-8b1ee48f3df1 rhgb quiet $tuned_params",
        "index": "0",
        "initrd": "/boot/initramfs-6.5.7-100.fc37.x86_64.img $tuned_initrd",
        "kernel": "/boot/vmlinuz-6.5.7-100.fc37.x86_64",
        "root": "UUID=65c70529-e9ad-4778-9001-18fe8c525285",
        "title": "Fedora Linux (6.5.7-100.fc37.x86_64) 37 (Workstation Edition)",
        "default": False
    }
]
```

## Example Playbook

```yaml
- hosts: all
  vars:
    bootloader_settings:
      # Update an existing kernel using path and replacing previous settings
      - kernel:
          path: /boot/vmlinuz-6.5.7-100.fc37.x86_64
        options:
          - name: console
            value: tty0
            state: present
          - previous: replaced
        default: false
      # Update an existing kernel using index
      - kernel:
          index: 1
        options:
          - name: print-fatal-signals
            value: 1
        default: true
      # Update an existing kernel using title
      - kernel:
          title: Red Hat Enterprise Linux (4.1.1.1.el8.x86_64) 8
        options:
          - name: no_timer_check
        state: present
      # Add a kernel with arguments
      - kernel:
          path: /boot/vmlinuz-6.5.7-100.fc37.x86_64
          initrd: /boot/initramfs-6.5.7-100.fc37.x86_64.img
          title: My kernel
        options:
          - name: console
            value: tty0
          - name: print-fatal-signals
            value: 1
          - name: no_timer_check
            state: present
        state: present
      # Add a kernel with arguments and copying default arguments
      - kernel:
          path: /boot/vmlinuz-6.5.7-100.fc37.x86_64
          initrd: /boot/initramfs-6.5.7-100.fc37.x86_64.img
          title: My kernel
        options:
          - name: console
            value: tty0
          - copy_default: true
        state: present
      # Remove a kernel
      - kernel:
          title: My kernel
        state: absent
      # Update all kernels
      - kernel: ALL
        options:
          - name: debug
            state: present
      # Update the default kernel
      - kernel: DEFAULT
        options:
          - name: quiet
            state: present
    bootloader_timeout: 5
    bootloader_password: null
    bootloader_remove_password: false
    bootloader_reboot_ok: true
  roles:
    - linux-system-roles.bootloader
```

## rpm-ostree

See README-ostree.md

## License

MIT

bootloader

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