See my answers below. Lissa K. Valletta 8-3/B10 Poughkeepsie, NY 12601 (tie 293) 433-3102
From: Stuart Barkley <[email protected]> To: xCAT Users Mailing list <[email protected]>, Date: 07/20/2013 05:47 PM Subject: Re: [xcat-user] Moving/Reinstalling xCAT On Fri, 19 Jul 2013 at 13:22 -0000, Lissa Valletta wrote: > What release of xCAT are your running now. 2.7.6 to 2.8.x. I could keep the same version and then upgrade if folks thought that safer. I could possibly upgrade first which might be even better (the osimage changes have me a little nervous). > If you move to another machine, then you have the benefit of having > the old machine around for reference. Yes, that will be the plan. > I think I would dumpxCATdb ( please do not just copy files) on the > old machine. run tabprune auditlog -a before you do. That is > usually the biggest table, unless you have been pruning it or have > auditlog turned off. Planned. I do periodic dumpxCATdb to preserve configuration history and look for unexpected changes. auditlog is off. > Another good way to backup your configuration ( including the > database) is run xcatsnap. Never looked at it before. It shows one other directory I had not planned to copy (/root/.xcat). LKV: You do not need to copy this directory. When you install 2.8 xCAT on the new MN, it will be created for you. These are the credentials. When you run makeconservercf, it will update the credentials. Since you have not service nodes, you don't have to worry about sending the credentials to the nodes. They are not used on compute nodes. xcatsnap looks useful, but it appears preserve the ssh and ca private key files. I don't like the idea of these being sent outside the cluster, even for diagnostic purposes. > I would install the new machine with Centos6 and go through the > process documented for setting up the MN . I expect you might just > want to copy /etc/hosts and /etc/resolv.conf from the previous MN. > If hostname and ip address are the same then this should be pretty > easily. Install xCAT - good time to go the latest release. > restorexCATdb from your backup. > > run makedns -a > run makedhpc -n > run makedhcp -a > > Run rspconfig to update the MM with the new ssh keys > run makeconservercf to update with the new credentials > > Run xdsh -K to your nodes to put out the new ssh keys. I want to preserve the old ssh keys (at this time). External systems have them in various known_hosts files and I don't want to deal with the fallout at this time. LKV: Ok, I think you are talking about /root/.ssh keys. Copy them to /root/.ssh on the new management node before you install xCAT. If they are there, xCAT will not replace them. In the future I want to change the ssh keys but I would rather that be a separate step. (We also need to periodically change all the other secrets on the cluster, root password, bmc passwords, switch passwords, etc). Later on you can just use xcatconfig -k to change them and the man page for xcatconfig will tell you what you need to update. > Depending on how your nodes are provisioned, There are probably > directories under /install such as /install/custom you may want to > copy to the new machine. I'll probably copy (and cleanup) /install to the new node. LKV: You have to be careful here. Unless you do upgrade the old MN to the release you are going to be installing on the new MN. The /install/postscripts and prescripts directory and subdirectories will not match. If you put the 2.7 /install/postscripts on 2.8 there will be a problem. > If these are diskfull installed node, I think this is about all you > need to do. > > If diskless images you might want to use the imgexport/imgimport > commands, You might want to generate new images for Centos6 thoough. > You are not going to be able to generate a Centos 5 image on a > Centos6 MN. The xCAT node is the last thing in this cluster running CentOS 5. Everything else has already been upgraded. Thanks, Stuart -- I've never been lost; I was once bewildered for three days, but never lost! -- Daniel Boone ------------------------------------------------------------------------------ See everything from the browser to the database with AppDynamics Get end-to-end visibility with application monitoring from AppDynamics Isolate bottlenecks and diagnose root cause in seconds. Start your free trial of AppDynamics Pro today! http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk _______________________________________________ xCAT-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/xcat-user
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