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Re: How to use DNS hostname of OpenShift on AWS

Michael are you running OpenShift on AWS?

https://github.com/openshift/openshift-ansible-contrib/tree/master/reference-architecture/aws-ansible is the AWS reference architecture and it does use openshift-ansible once the infrastructure is built, but it uses a dynamic inventory.

It’s not an option for us not to use the aws reference architecture to install OpenShift as it would be rather painful as we’re relying heavily on cloud formation and the dynamic inventory.

While ansible is running the hostnames are correct, so I’m suspecting that maybe OpenShift itself is detecting the cloud provider and overriding the hostname or maybe the ansible playbook is doing something similar. Inside the ansible openshift_facts python library I saw some custom hostname handling for Google Cloud, but not for AWS, but it made me suspicious thinking it might be hiding somewhere else.
On Wed, 21 Feb 2018 at 11:38 pm, Feld, Michael (IMS) <FeldM imsweb com> wrote:

Deploying with https://github.com/openshift/openshift-ansible you can define the hostnames in your inventory file. There is a sample inventory file at https://docs.openshift.org/latest/install_config/install/advanced_install.html that shows how to define the master/etcd/nodes, and those names should be used as the hostnames in the cluster.


From: users-bounces lists openshift redhat com [mailto:users-bounces lists openshift redhat com] On Behalf Of Joel Pearson
Sent: Wednesday, February 21, 2018 7:14 AM
To: users <users lists openshift redhat com>
Subject: How to use DNS hostname of OpenShift on AWS




I'm trying to figure out how to use the DNS hostname when deploying OpenShift on AWS using https://github.com/openshift/openshift-ansible-contrib/tree/master/reference-architecture/aws-ansible Currently it uses private dns name, eg, ip-10-2-7-121.ap-southeast-2.compute.internal but that isn't too useful a name for me.  I've managed to set the hostname on the ec2 instance properly but disabling the relevant cloud-init setting, but it still grabs the private dns name somehow.



Which did set the hostname in the node-config.yaml, but then when running "oc get nodes" it still returned the private dns name somehow, and installation failed waiting for the nodes to start properly, I guess a mismatch between node names somewhere.


I found an old github issue, but it's all referring to files in ansible that exist no longer:


Even on OpenShift Online Starter, they're using the default ec2 names, eg: ip-172-31-28-11.ca-central-1.compute.internal, which isn't a good sign I guess.


Has anyone successfully used a DNS name for OpenShift on AWS?





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