I am currenty preparing OpenStack-ready images of CentOS 7 and Ubuntu 14.04.

For the "automation" I use Packer, which is provided by you with a JSON-template. Packer then starts the installation using the virtualization you specify (in my case qemu).

After the installation, the virtual machine is being provisioned via SSH by Packer and the scripts you supply.

The status:

  • The root disk has 3 GB.
  • One partition, ext4, boot-flag, 100% of the root disk.

What I am trying to achieve here:

  • The image should resize itself on the first start to the max size of the disk

The Problem:

It does not work. It does not matter if I install only cloud-init or cloud-init and cloud-utils or cloud-init and cloud-utils and cloud-utils-growpart. I do not change the default cloud-init config, apart from enabling the root-login via ssh.

My cloud-init config is standard, apart from this line

disable_root: 0

Question: has someone already done this? I can't seem to find a working example

  • Please include the relevant cloud-init configuration and the commands you run. – l0b0 Aug 20 '14 at 12:38
  • Config is standard, only root-login is enabled (disable_root: 0) I don't run any specific commands, since it's supposed to "just" work, by installing cloud-init – Korni22 Aug 20 '14 at 13:23
  • Do you have the gdisk package installed? This is not a dependency on the 'cloud-utils-growpart' package, but it probably should be. – EmmEff Sep 18 '14 at 15:09
  • I tried it, still doesn't grow. clearpart --all --initlabel gpt was used to ensure gpt as partitioning scheme. – Korni22 Oct 14 '14 at 9:22
  • Instead of creating partition on root device, create filesystem directly on the root device. That way you can have a resize2fs take care of resizing FS every time the system comes up. NOTE: If you have a partition, you have to somehow automate extension of partition before you could extent FS. You could automate that but would be a little messy. – Jayan Nov 19 '14 at 5:25

I just fixed the same problem. My vmbuilder created an image with a root partition followed by a swap partition. cloud-utils-growpart can't grow the root partition if there's one immediately after it. I deleted the swap partition and the root partition resized correctly on reboot

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