That may be what I need actually, because I have to wipe the OS on our current (physical) headnode to upgrade from RHEL5 to RHEL6 and I need something (a VM HA management node) up and functional while I am doing that to service the cluster.
-Josh On Thu, Jan 9, 2014 at 2:32 PM, Lissa Valletta <lis...@us.ibm.com> wrote: > Highly Available management nodes makes sure that if one Management > Server goes down there is one configured that can take over. Only one > Management Server at a time is active. > > > Lissa K. Valletta > 8-3/B10 > Poughkeepsie, NY 12601 > (tie 293) 433-3102 > > > > [image: Inactive hide details for Josh Nielsen ---01/09/2014 03:13:09 > PM---Thank you Xiao Peng Wang, that information is useful. I am t]Josh > Nielsen ---01/09/2014 03:13:09 PM---Thank you Xiao Peng Wang, that > information is useful. I am thinking that, in that case, Service Node > > From: Josh Nielsen <jniel...@hudsonalpha.org> > To: xCAT Users Mailing list <xcat-user@lists.sourceforge.net>, > Date: 01/09/2014 03:13 PM > Subject: Re: [xcat-user] How to create and deploy an xCAT Service Node > ------------------------------ > > > > Thank you Xiao Peng Wang, that information is useful. I am thinking > that, in that case, Service Nodes are not what I need after all. Our > cluster is not at a scale yet that requires additional repositories to > pull software updates from (which SNs look like they are designed > for). Rather I need additional management points. I looked a little > further and it looks like Highly Available Management Nodes are what I > need: > http://sourceforge.net/apps/mediawiki/xcat/index.php?title=Highly_Available_Management_Node > . > > I do have a question about the Service Nodes though since I've already > begun configuring them: > > In the Service Node setup documentation on the wiki, under the heading > "Add OS and Hardware Attributes to Service Nodes" they tell you to do > a chdef with parameters like: > > chdef -t group service arch=x86_64 os=centos6.4 nodetype=osi ... > > My question is about the "nodetype". I will be deploying to VMs acting > as the SNs, so should the nodetype not rather be "nodetype=vm"? What > does "nodetype=osi" as an "osimage" even mean when applied to a > physical or virtual machine? > > When I do an lsdef on the nodes (that will be on VMs) I see: > # lsdef service > arch=x86_64 > groups=service,ipmi,all > installnic=mac > ip=172.20.3.1 > netboot=xnba > nfsserver=10.X.X.X > nodetype=osi > ... > Object name: xcat-serv2 > arch=x86_64 > groups=service,ipmi,all > installnic=mac > ip=172.20.3.2 > netboot=xnba > nfsserver=10.X.X.X > nodetype=osi > .. > > But the VMs are vms and not osimages. I'm just wondering about the > semantics of what "osi/osimage" indicates should be done to a node or > how it will affect deployment. > > Thanks, > Josh > > On Wed, Jan 8, 2014 at 6:32 PM, Xiao Peng Wang <w...@cn.ibm.com> wrote: > > The doc mentioned by Josh will lead you in the correct direction to setup > > Service Node. > > > > Several information for you: > > > > Roughly, your understand is correct that you can install and configure a > SN > > automatically when prepare/configure correctly for SNnode definition > > (correct group like service, correct attribute like postscripts, correct > > osimage like rhels6.4-x86_64-install-service) and xCAT rpm repository. > > > > Generally, the /tftpboot and /install on SN are mounted from xCAT MN, so > > them will be identical with the dirs on MN in any time. > > > > SN cannot work without MN since there's only one database which is > running > > on MN. If MN is down you cannot run lots of commands on SN. In fact xCAT > > does NOT recommend to run any command on SN. > > > > > > > > Thanks > > Best Regards > > ---------------------------------------------------------------------- > > Wang Xiaopeng (王晓朋) > > IBM China System Technology Laboratory > > Tel: 86-10-82453455 > > Email: w...@cn.ibm.com > > Address: 28,ZhongGuanCun Software Park,No.8 Dong Bei Wang West Road, > Haidian > > District Beijing P.R.China 100193 > > > > Josh Nielsen ---2014/01/09 03:48:01---Hi Russell, For some reason that > wiki > > page never came up in my Google searches even > > > > From: Josh Nielsen <jniel...@hudsonalpha.org> > > To: xCAT Users Mailing list <xcat-user@lists.sourceforge.net>, > > Date: 2014/01/09 03:48 > > Subject: Re: [xcat-user] How to create and deploy an xCAT Service Node > > ________________________________ > > > > > > > > Hi Russell, > > > > For some reason that wiki page never came up in my Google searches even > when > > I placed quotes around "service node". Thanks! I'll take a look through > it. > > > > Regards, > > Josh > > > > > > On Wed, Jan 8, 2014 at 12:25 PM, Russell Jones < > russell-l...@jonesmail.me> > > wrote: > > > > Hi Josh, > > > > This should be helpful for you (it was for me when first learning how to > set > > this up): > > > http://sourceforge.net/apps/mediawiki/xcat/index.php?title=Setting_Up_a_Linux_Hierarchical_Cluster > > > > > > > > On 1/8/2014 11:52 AM, Josh Nielsen wrote: > > > > Hello all, > > > > I am trying to move my xCAT installation toward a hierarchical structure > by > > including Service Nodes but I am finding a dearth of information on how > to > > create a service node on the xCAT wiki and even the Sumavi xCAT guide. At > > first I began following the instructions for a setting up a management > node > > (which involves a new xCAT install, an independent xCAT database, etc.) > on a > > VM intended to the the SN but then realized that that must be wrong. > > > > I have noticed the xCAT 'servicenode' database table present on the > > Management Node (listed with tabdump). I am wondering if I can simply > > designate a new node (in my case a VM) to be the prospective SN, > designate > > which services (like dhcp, dns, etc.) to enable/disable in the > 'servicenode' > > table, and then do a fresh 'rinstall' to that VM and have it be > > automatically & fully configured as an SN from postinstall scripts > (which I > > presume are already present and will be automatically applied to that > node > > by some xCAT logic of parsing the 'servicenode' table and associating any > > relevant postscripts to be run with the node). > > > > If so will it create the /install and /tftpboot directories (including > ISOs > > made with copycds) on each SN identical to the contents of the MN? Is it > > that simple or is there more involved than that? > > > > In addition I want to be able to take down the Management Node in the > future > > for maintenance and be able to do just about everything that the MN can > do > > from the SNs (including dhcp leases, rpower commands, updatenode, psh, > etc) > > while the MN is down. Is that possible? Any clarifications would be > > appreciated. > > > > Thank you, > > Josh Nielsen > > > > > > > ------------------------------------------------------------------------------ > > Rapidly troubleshoot problems before they affect your business. Most IT > > organizations don't have a clear picture of how application performance > > affects their revenue. With AppDynamics, you get 100% visibility into > your > > Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics > > Pro! > > > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk > > > > > > _______________________________________________ > > xCAT-user mailing list > > xCAT-user@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/xcat-user > > > > > > > > > ------------------------------------------------------------------------------ > > Rapidly troubleshoot problems before they affect your business. Most IT > > organizations don't have a clear picture of how application performance > > affects their revenue. With AppDynamics, you get 100% visibility into > your > > Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics > > Pro! > > > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk > > _______________________________________________ > > xCAT-user mailing list > > xCAT-user@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/xcat-user > > > > > ------------------------------------------------------------------------------ > > Rapidly troubleshoot problems before they affect your business. Most IT > > organizations don't have a clear picture of how application performance > > affects their revenue. With AppDynamics, you get 100% visibility into > your > > Java,.NET, & PHP application. 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