[gpfsug-discuss] Dual server NSDs - change of hostname

Uwe Falke UWEFALKE at de.ibm.com
Thu Apr 5 02:57:15 BST 2018


Hm, 
you can change the host name of a Scale node.
I've done that a while ago on one or two clusters. 

>From what I remember I'd follow these steps: 

1. Upgrade the OS configuring/using the old IP addr/hostname
(2. Reinstall Scale)
(3. Replay the cluster data on the node)
4. Create an interface with the new IP address on the node (not 
necessarily connected)
5. Ensure the node is not required for quorum and has currently no mgr 
role. You might want to stop Scale on the node.
5. mmchnode -N <legacy_name> --daemon-interface <new_name> ; mmchnode -N 
<legacy_name> --admin-interface <new_name>. Now the node has kind of 
disappeared, if the new IF is not yet functional, until you bring that IF 
up (6.)
(6. Activate connection to other cluster nodes via new IF)

2. and 3. are required if scale was removed / the system was re-set up 
from scratch
6. is required if the new IP connection config.ed in 4 is not operational 
at first (e.g. not yet linked, or routing not yet active, ...) 


Et voila, the server should be happy again, if stopped before, start up 
Scale and check.

No warranties, 
But that's how I'd try. 
As usual: if messing with IP config, be sure to have a back door to the 
system in case you ground the OS network config . 


 
Mit freundlichen Grüßen / Kind regards

 
Dr. Uwe Falke
 
IT Specialist
High Performance Computing Services / Integrated Technology Services / 
Data Center Services
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From:   John Hearns <john.hearns at asml.com>
To:     gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:   04/04/2018 21:33
Subject:        [gpfsug-discuss] Dual server NSDs - change of hostname
Sent by:        gpfsug-discuss-bounces at spectrumscale.org



Following up from my previous email (I should reply to that email I know)
What we really want to achieve is changing the FQDN of an existing server.
The server will be reinstalled with an updated OS (RHEL 6-à RHEL 7)
During the move we wish to change the domain name of the server.
So we will be taking the server offline and bringing the same physical 
server back up with a new domain name.
Has anyone done a procedure like this?
 
Thankyou
 
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