9ed7466fd8
Reclaims the half-disk LV left by the Ubuntu Server autoinstall template default. Idempotent — no-ops cleanly when there are no free PE in the VG, and exits the play cleanly on hosts without LVM. Supports ext4 and xfs. Does not handle partition resize (cloud-utils growpart) — out of scope for the template fix-up case. Wired into day1_deploy_honcho.yml ahead of the honcho role so newly provisioned VMs get the fix-up automatically. Suitable to add to any day1 playbook by simply listing it before the application role.
64 lines
2.2 KiB
Markdown
64 lines
2.2 KiB
Markdown
# expand-root-lv role
|
|
|
|
Idempotent role that extends the root LVM logical volume to fill its
|
|
volume group and grows the underlying filesystem (ext4 or xfs).
|
|
|
|
## Why this role exists
|
|
|
|
The Ubuntu Server autoinstall template (used by the mk-labs `wed`-baked
|
|
VM templates) provisions the root LV at roughly half the available disk
|
|
size — a longstanding installer default that surprises everyone who
|
|
hasn't been bitten by it before. Every freshly-provisioned VM in mk-labs
|
|
needs this fix-up before it's fully useful.
|
|
|
|
## Idempotency
|
|
|
|
- If `vg_free_count == 0`, the `lvextend` step is skipped and the
|
|
filesystem-grow step is also skipped (nothing to resize against).
|
|
- If the target volume group doesn't exist on the host (e.g. a non-LVM
|
|
layout), the role exits cleanly via `meta: end_play`.
|
|
- Safe to leave in a day1 deploy playbook so future disk expansions
|
|
(Proxmox-side disk grow → reboot → run role) are picked up
|
|
automatically.
|
|
|
|
## Usage
|
|
|
|
Standalone:
|
|
|
|
```yaml
|
|
- hosts: lincoln
|
|
become: true
|
|
roles:
|
|
- expand_root_lv
|
|
```
|
|
|
|
Or chained ahead of an application role in a day1 playbook:
|
|
|
|
```yaml
|
|
- hosts: honcho_server
|
|
become: true
|
|
roles:
|
|
- expand_root_lv
|
|
- honcho
|
|
```
|
|
|
|
## Defaults
|
|
|
|
| Variable | Default | Purpose |
|
|
|-----------------------------------|---------------|---------------------------------------------------|
|
|
| `expand_root_lv_vg_name` | `ubuntu-vg` | LVM volume group name (Ubuntu installer default). |
|
|
| `expand_root_lv_lv_name` | `ubuntu-lv` | LVM logical volume name (Ubuntu installer default). |
|
|
| `expand_root_lv_mountpoint` | `/` | Mountpoint of the filesystem to grow. |
|
|
|
|
Override these in `host_vars/<host>.yml` for hosts that use a different
|
|
LVM layout. Hosts without LVM are silently no-op'd.
|
|
|
|
## Limitations
|
|
|
|
- Does not extend the underlying partition. If the operator grows the
|
|
Proxmox disk and the partition itself needs to grow before lvextend
|
|
can claim the new space, run `growpart /dev/sda 3` (or equivalent)
|
|
first. A future enhancement could automate this via `cloud-utils`'
|
|
`growpart` package, but it's out of scope for the initial template
|
|
fix-up case where the partition already covers the whole disk.
|