Description of problem:
The Kubernetes Cluster API project is unable to use the templating support added in cloud-init 18.4 to access instance metadata. The version of cloud-init included with RHEL is older than 18.4 and as such it does not allow us to do this.
Version-Release number of selected component (if applicable): 18.2
How reproducible: 100%
Steps to Reproduce:
1. Set up cloud-init user data that includes a template reference to instance metadata.
2. Start the server/virtual machine with this user data.
Cloud-init fails because it is not able to interpret the template syntax.
Cloud-init interprets the template syntax and succeeds.
Here is the Cluster API issue related to this: https://github.com/kubernetes-sigs/cluster-api-bootstrap-provider-kubeadm/issues/41.
Here is the cloud-init information about using instance data with templating that was added in 18.4: https://cloudinit.readthedocs.io/en/latest/topics/instancedata.html#using-instance-data.
I believe this is the commit that added this support: https://git.launchpad.net/cloud-init/commit/?h=18.4&id=c7555762f3a30190ce7726b4d013bc3e83c7e4b6.