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 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. 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