Support Questions
Find answers, ask questions, and share your expertise
Announcements
Alert: Welcome to the Unified Cloudera Community. Former HCC members be sure to read and learn how to activate your account here.

Facilitating HDP cluster hostname change

Solved Go to solution

Facilitating HDP cluster hostname change

New Contributor

Recently we had a situation where a customer wanted to migrate their nodes running master services (NameNode, Zookeeper, ZKFC and the Journal nodes) of a HDP 2.2 cluster from VMs to a physical servers. While swapping servers, they realized that changing host names required a thorough process planning and some “down the stream” configuration changes.

For instance, application servers that refer hostname in ZK quorum etc needed update as well. On top of careful planning, these types of dependent application changes also caused overhead. There were many manual processes that could have led to misconfiguration. Having given the background, are there any plans to address these types of operational challenges? One possible solution was to create additional DNS aliases (canonical names for each node) and use these DNS aliases in application configuration instead of hostnames.

If this process were to be implemented, what changes would we have to do with the installation process and patching process in future? This would be helpful if one has to swap the underlying server to a different name or change hostname or IP or even move servers from one data center to another. Do you foresee any challenge down the line in terms of maintenance or other operations? Though this does come with additional work of generating alias for each node, especially for large clusters such as one with 500 or 1000 nodes, it would provide value for the operations team. Generating additional alias would be a onetime challenge that could be addressed with text editing utilities. A small one time cost for a long-term benefit

1 ACCEPTED SOLUTION

Accepted Solutions
Highlighted

Re: Facilitating HDP cluster hostname change

Guru

Hey @sraghavan@hortonworks.com there is no plans to date to productize this practice, but it does seem like something that customers could do for their masters in situations where they want to easily be able to replace or move physical hosts and may be best dealt with as a run book addition or practice that can be documented with pro's/con's.

View solution in original post

2 REPLIES 2
Highlighted

Re: Facilitating HDP cluster hostname change

Guru

Hey @sraghavan@hortonworks.com there is no plans to date to productize this practice, but it does seem like something that customers could do for their masters in situations where they want to easily be able to replace or move physical hosts and may be best dealt with as a run book addition or practice that can be documented with pro's/con's.

View solution in original post

Highlighted

Re: Facilitating HDP cluster hostname change

I'd go with the extra DNS entries for the different services.

Don't have an account?
Coming from Hortonworks? Activate your account here