Prevent cloud-init from creating disk partitions

Question

I am setting up a VM in azure and it comes with an ephemeral(ssd) disk. This disk is on /dev/sdb and cloud init is creating a partition /dev/sdb1 on it. I am using centos7 with cloud init 19.4. Using the config below. I was wondering if there was any way I cloud do this without creating a partition?

datasource_list: [ Azure ]
device_aliases: {'ephemeral0': '/dev/sdb'}
disk_setup:
    ephemeral0:
         table_type: 'gpt'
         layout: 'true'
         overwrite: 'false'

fs_setup:
    - label: ephemeral0
      filesystem: xfs
      device: ephemeral0.0

mounts:
  - ["ephemeral0", "/logs"]

sdb           8:16   0  160G  0 disk
`-sdb1        8:17   0  160G  0 part /logs

I went through the docs and I've tried setting layout to false as well but it does not seem to work. The logs always say this and I can't seem to figure out where this is coming from.

"manual request of partition 1 for /dev/sdb1"

falcojr falcojr · Accepted Answer · 2021-05-12T23:38:12

disk_setup is what is creating the partition. You can create the filesystem on the partition-less disk like this:

#cloud-config
fs_setup:
    - label: ephemeral0
      filesystem: xfs
      device: /dev/sdb

mounts:
  - ["/dev/sdb", "/logs"]

Prevent cloud-init from creating disk partitions

1 Answers