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Beginner

Hyperflex DNS Unreachable

Hello team. I have a Hyperflex Cluster with 12 nodes. The DNS server that we used in the implementation was migrated to the new infrastructure. After a power outage, the cluster failed to start because there was no DNS server available to resolve the host name of each node. I could solve it by restoring a DNS server backup outside the cluster.

 

Is it possible to change the settings from hostname to IP address?

 

Best regards
Jose

5 REPLIES 5
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Cisco Employee

Re: Hyperflex DNS Unreachable

Greetings.

Yes, you need to have at least 1 DNS and NTP server outside the HX cluster to avoid a dependency loop.

"Is it possible to change the settings from hostname to IP address?" <<< settings of what? DNS server values?

If so, just use command: stcli services dns set --dns x.x.x.x

Hopefully you can set more than one DNS server permanently, with at least one outside the cluster.

 

Kirk...

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Beginner

Re: Hyperflex DNS Unreachable

Great Kirk J! Thanks a lot.

 

When I mentioned the DNS, I was talking about to change the FQDN of every node to an IP address. My idea is not utilize an Out of box DNS, when the cluster reloads. This could be possible?

 

Best regards

Jose

Highlighted
Cisco Employee

Re: Hyperflex DNS Unreachable

Hyperflex requires FQDN resolution.  Are you talking about trying to to remove host names from the overall configuration?

 

Kirk...

Highlighted
Beginner

Re: Hyperflex DNS Unreachable

Hi Kirk, I just want to try something that let me change the dependency on an external DNS, when the cluster reloads.

 

Best regards

Jose

Highlighted
Cisco Employee

Re: Hyperflex DNS Unreachable

Unfortunately, your goal, does not meet a basic requirement.

 

Kirk...

 

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