Re: [xcat-user] xcat integration to an existing cluster

Yuan Y Bai Sun, 05 Nov 2017 18:37:01 -0800

Hi imam,

You are right, xcat is better adaptable than other provisioning systems, I think you can do the following basic things at first:

1, Install one system as xcat management node: http://xcat-docs.readthedocs.io/en/latest/guides/install-guides/index.html

2, Define nodes to add the existing machine IP #'s, MAC addresses, arch, serialport, serialspeed, cons, hardware control related attribute like mgt,bmc,bmcusername,bmcpassword etc.

3, Add these nodes name and into /etc/hosts table using "makehosts -n"

4, Configure DNS, DHCP, console, set up the SSH keys to use parallel commands or updatenode

5, Make sure harware management work well

6, Since you do not want to re-provision os, you need to remember not to run "rinstall ...." or "nodeset <node> osimage=..." or "nodeset <node> osimage" etc.

Here is manage clusters doc:

http://xcat-docs.readthedocs.io/en/latest/guides/admin-guides/manage_clusters/index.html

Based on this doc, you can try these sections and have fun with it:

Best Regards
--------------------------------------------------
Yuan Bai (白媛)

CSTL HPC System Management Development
Tel:86-10-82451401
E-mail: by...@cn.ibm.com
Address: IBM ZGC Campus. Ring Building 28,
ZhongGuanCun Software Park,No.8 Dong Bei Wang West Road, Haidian District,
Beijing P.R.China 100193

IBM环宇大厦
北京市海淀区东北旺西路8号，中关村软件园28号楼
邮编:100193

----- Original message -----
From: Imam Toufique <techie...@gmail.com>
To: xCAT Users Mailing list <xcat-user@lists.sourceforge.net>
Cc:
Subject: [xcat-user] xcat integration to an existing cluster
Date: Sat, Nov 4, 2017 12:53 AM

Hi,

I am highly considering using Xcat in our current cluster, it seems to be better adaptable than other provisioning systems I have recently tried.

Having said that, if I did that, what do you recommend for integrating Xcat into a running cluster? We have over 300 nodes in the cluster, and I don't want Xcat to flag the current running systems to provision. I was thinking about starting Xcat with a new subnet, but I am not sure if that will be enough. Perhaps there is a way to just add the existing machine names, IP #'s, MAC addresses, BMC address/credentials in Xcat and set the state to 'boot' (for chain) and hopefully, Xcat will not flag them to 'image' during their next reboot or startup.

Looking for suggestions here, Thanks again for the help!

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Re: [xcat-user] xcat integration to an existing cluster

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