How to re-run cloud-init without reboot

Question

I am using openstack to create a VM using \'nova boot\' command. My image is cloud-init enabled. I pass a --user-data script which is a bash shell format for cloud-init to run d

Answer 1

Since this keeps popping up in search results, what works for me:

1. Delete semaphores in /var/lib/cloud/instances/i-xxxxxxx/sem. Cloud-init will not re-run if these files are present.

2. Edit /var/lib/cloud/instances/i-xxxxxxxx/scripts/part-001. This is your user-data script.

3. Execute only the user scripts module of cloud-init. This will not re-download user data but execute the already downloaded (and now, modified) script from step 2.

   sudo /usr/bin/cloud-init single -n cc_scripts_user

Answer 2

The commands have been updated so to re-run you need to clean out the existing config:

sudo cloud-init clean

Then re-run it using the init directive:

sudo cloud-init init

Beware: things like ssh host keys maybe regenerated.

Answer 3

Updated: on recent versions:

sudo cloud-init clean

Then re-run it using the init directive:

sudo cloud-init init

Answer 4

To run the packages module of cloud-config part of cloud-init, you can run

# cloud-init-cfg all config

To run the runcmd module of cloud-config part of cloud-init, you can run

# cloud-init-cfg all final