If I do use a Service Node instead, even if the Management Node goes down and the SN loses some functionality because of it, could the SN still serve the xCAT-set DNS and DCHP leases to all the nodes in the stead of the Management Node? That really is my minimum/only requirement. I have diskful, stateful nodes that could perfectly function without xCAT except that they need the DNS and DCHP services managed on the MN.
It is looking like creating even a secondary Highly Available Management Node may be difficult since the requirements for a HAMN are: "xCAT HAMN requires that the operating system version, xCAT version and database version be identical on the two management nodes." My physical Management Node uses RHEL and all my VMs run CentOS. Maybe however I can get away with this, since CentOS is a direct derivative of RHEL that is binary compatible, IF I can bring them both up to the same kernel version. I'm going to guess that it is the kernel version (and of course filesystem hierarchy and binary compatibility) that are really what are needed the most. -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. 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 > > > > > > > ------------------------------------------------------------------------------ > > CenturyLink Cloud: The Leader in Enterprise Cloud Services. > > Learn Why More Businesses Are Choosing CenturyLink Cloud For > > Critical Workloads, Development Environments & Everything In Between. > > Get a Quote or Start a Free Trial Today. > > > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk > > _______________________________________________ > > xCAT-user mailing list > > xCAT-user@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/xcat-user > > > > > ------------------------------------------------------------------------------ > CenturyLink Cloud: The Leader in Enterprise Cloud Services. > Learn Why More Businesses Are Choosing CenturyLink Cloud For > Critical Workloads, Development Environments & Everything In Between. > Get a Quote or Start a Free Trial Today. > > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk > _______________________________________________ > xCAT-user mailing list > xCAT-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/xcat-user > > > > ------------------------------------------------------------------------------ > CenturyLink Cloud: The Leader in Enterprise Cloud Services. > Learn Why More Businesses Are Choosing CenturyLink Cloud For > Critical Workloads, Development Environments & Everything In Between. > Get a Quote or Start a Free Trial Today. > > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk > _______________________________________________ > xCAT-user mailing list > xCAT-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/xcat-user > >
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