On Mon, Aug 15, 2016 at 4:17 AM, Frank Liauw <[email protected]> wrote: > Hi All, > > I have a 5 node Openshift cluster split across 2 AZs; our colocation > center and AWS, with a master in each AZ and the rest being nodes. > > We setup our cluster with the Ansible script, and somewhere during the > setup, the EC2 instance's private hostname were picked up and registered as > node names of the nodes in AWS, which is a bit annoying as that deviates > from our hostname conventions and is rather difficult to read, and it's not > something that can be changed post setup. > > It didn't help that parts of the admin operations seem to be using the EC2 > instance's private hostname, so I get errors like this: > > # oc logs logging-fluentd-shfnu > Error from server: Get https://ip-10-20-128-101.us- > west-1.compute.internal:10250/containerLogs/logging/logging- > fluentd-shfnu/fluentd-elasticsearch: dial tcp 198.90.20.95:10250: i/o > timeout > > Scheduling system related pods on the AWS instances works (router, > fluentd), though any build pods that lands up on EC2s never gets built, and > just eventually times out; my suspicion is that the build process monitors > depends on the hostname which can't be reached from our colocation center > master (which we use as a primary), and hence breaks. > > I'm unable to find much detail on this behaviour. > > 1. Can we manually change the hostname of certain nodes? >
The nodeName value overrides this, however if you are relying on cloud provider integration there are limitations, see below. > > 2. How do we avoid registering EC2 nodes with their private hostnames? > f you are willing to give up the native cloud provider integration (ability to leverage EBS volumes as PVs), then you can override this using the openshift_hostname variable when installing the cluster. At least as of Kubernetes/Origin 1.2, the nodeName value in the node config needed to match the private dns name of the host. -- Jason DeTiberus
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