Support Questions

mjarnold · ‎03-06-2017

In a recent Predictive Cluster Validation Summary for one of my clusters, Cloudera Proactive Support states:

"The following hosts have IPv6 enabled, which is against our best practices, because it can cause connectivity problems. This is discussed in the CDH documentation. (http://www.cloudera.com/content/cloudera/en/documentation/core/latest/topics/cdh_ig_req_supported_ve..."

Yet that page simply says that "IPv6 is not supported and must be disabled."

If this is a hard requirement, then why is there no documentation on *how* to disable IPv6 for the various supported OSs? I understand that Cloudera may not want to get into the OS configuration business, but at least pointers to vender documentation should be provided.

bgooley · ‎03-06-2017

Hello @mjarnold,

Thank you for pointing that out. I have added this post to internal Cloudera Jira DOCS-1862 where we are discussing documentation.

Regards,

Ben

Alex · ‎03-06-2017

Thank you Ben.

mjarnold · ‎01-19-2018

Hey @bgooley,

Is there any update on DOCS-1862?

mjarnold · ‎01-22-2018

@Alex,

I am curious as to what the Proactive Support tests look for when testing whether IPv6 is enabled. Is it the existence of IPv6 addresses on interfaces or the presence of the IPv6 kernel module?

Red Hat's solutions indicate that you can either disable the kernel module via kernel boot options (results in other things breaking) or disable IPv6 on network interfaces via sysctl. Debian appears to be similar.

Alex · ‎01-22-2018

Hi Michael,

Based on what I see in the script/code, it's the presence of inet6 in the ifconfig output, which is included in the diagnostic bundle. If inet6 is present and in use, I believe that's the basis for the alert that was issued.

Best,

Alex