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cloudinit/Documentation/cloud-config-locations.md
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Cloud-Config Locations

On every boot, coreos-cloudinit looks for a config file to configure your host. Here is a list of locations which are used by the Cloud-Config utility, depending on your CoreOS platform:

  • Mount point with config-2 label. It should contain a openstack/latest/user_data relative path. An absolute path inside CoreOS should look like /media/configvirtfs/openstack/latest/user_data. Usually used by cloud providers or in VM installations.
  • FAT or ISO9660 filesystem with config-2 label. A /media/configdrive/ mount point should contain a /media/configdrive/openstack/latest/user_data absolute path to the config file. Usually used in VM installations.
  • Kernel command line: cloud-config-url=http://example.com/user_data. You can find this string using this command cat /proc/cmdline. Usually used in PXE or iPXE boots.
  • /var/lib/coreos-install/user_data when you install CoreOS manually using the coreos-install tool. Usually used in bare metal installations.
  • OEM images use /usr/share/oem/cloud-config.yml path.
  • Azure platform uses OEM path for first Cloud-Config initialization and then /var/lib/waagent/CustomData to apply your settings.
  • DigitalOcean and EC2 use URLs to download Cloud-Config.

You can also run the coreos-cloudinit tool manually and provide a path to your custom Cloud-Config file:

sudo coreos-cloudinit --from-file=/home/core/cloud-config.yaml

This command will apply your custom cloud-config.