question Hostnames of node instances in Archives of Support Questions (Read Only)

Hostnames of node instances

ztoth — Fri, 16 Sep 2022 11:53:05 GMT

Hi,

I created a deployment and a cluster using Director. After the EC2 instances were running and cluster was all set up, I changed the hostname of the instances. Now, I want to update the hostnames in the Manager, (and also the Manager's hostname in Director) because they point to the old ones (ip-xxxxx.eu-west-1.compute.internal) Is there a way to do that? I found https://www.cloudera.com/documentation/enterprise/5-7-x/topics/cm_ag_change_hostnames.html, but I hope there is an easier solution to that. Is it possible to tell Director/Manager to use a specific hostnames when creating the cluster? Or do I need to run a script and change the hostnames before Director starts to install the services on the nodes?

Re: Hostnames of node instances

mbigelow — Wed, 05 Jul 2017 01:06:02 GMT

That links contains the proper instructions. Effectively, the hostnames you installed CDH with (CM agent and up) will be what is used for CM (and most likely director). Any change after that will require these steps.

Re: Hostnames of node instances

dhan — Wed, 05 Jul 2017 14:19:03 GMT

Director uses the IP address and hostnames reported back by the cloud provider (e.g., AWS) to connect to the instance. If Director is inside the same VPC as the instance, this will be the internal IP address or private hostname. If Director is outside the VPC, then this will be the public IP or public hostname.

Since these values come from the cloud provider, it is best for them to be set as you like when the instance is allocated. Some possible suggestions for doing so are to use a custom DNS server or to bake some hostname assignment logic into your AMI.

Re: Hostnames of node instances

ztoth — Fri, 07 Jul 2017 14:52:00 GMT

Thanks for the answers. The described steps solve the DNS change for Manager indeed. For director, I will use a pre-baked Manager AMI as suggested.