Ansible: is it possible to resize ext4 filesystem?

Question

How I can resize ext4 filesystem via Ansible? I know about the filesystem module, but I didn't see a "resize" parameter, or something else about it ...

Answer 1

In order to make the task idempotent, add another task to first check for any unexpanded partitions. E.g., if you want the root partition to be at least 10 GB:

  - name: Assert root partition is expanded
    assert: { that: item.mount != '/' or item.size_total > 10737418240 } # 10 GB
    with_items: '{{ ansible_mounts }}'
    ignore_errors: yes
    register: expanded

NOTE: This task fails if the partition / is less than 10 GB.

Next, make the expansion task conditional on expanded|failed:

  - name: Expand partition
    command: parted /dev/mmcblk0 resizepart 2 15.5GB # NOTE: Assumes 16GB card
    when: expanded|failed
    notify: Expand filesystem

In my case, I'm expanding partition 2 on the block device /dev/mmcblk0 (for the Raspberry Pi). You should of course replace with the device names on your system.

Finally, notify triggers filesystem expansion:

  handlers:
  - name: Expand filesystem
    command: resize2fs /dev/mmcblk0p2