Thank you Lissa, that is helpful. -Josh
On Fri, Jan 10, 2014 at 1:25 PM, Lissa Valletta <lis...@us.ibm.com> wrote: > DNS and DHCP will still work from the Service Node, if setup correctly. > In other words, you have configured the service node as the DNS server > and/or DHCP server for the nodes and there is no requirement on the > Management Node for dns or dhcp. You will not be able to run any > xcat commands on the service node, if the Management Node is down. xCAT > requires access to the database configured on the MN for the xcat cluster > ( mysql, postgresql) to run most xcat commands. Even to recognize that the > node is in the xcat cluster. > > Lissa K. Valletta > 8-3/B10 > Poughkeepsie, NY 12601 > (tie 293) 433-3102 > > > > [image: Inactive hide details for Josh Nielsen ---01/10/2014 12:59:12 > PM---Hi Wang Xiaopeng (I apologize if I got your name wrong befor]Josh > Nielsen ---01/10/2014 12:59:12 PM---Hi Wang Xiaopeng (I apologize if I got > your name wrong before), You said: "SN cannot work without MN > > From: Josh Nielsen <jniel...@hudsonalpha.org> > To: xCAT Users Mailing list <xcat-user@lists.sourceforge.net>, > Date: 01/10/2014 12:59 PM > Subject: Re: [xcat-user] How to create and deploy an xCAT Service Node > ------------------------------ > > > > Hi Wang Xiaopeng (I apologize if I got your name wrong before), > > You said: "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." > > Will DNS and DHCP still work however from an SN when the MN is down? I > would need the SN to still resolve the compute nodes' DNS requests on the > cluster subnet and issue DHCP leases/renewals as necessary. It looks like > SNs are intended to take responsibility on behalf of the MN for serving the > compute nodes' necessary services, such that you designate each node's > "xcatmaster" as the SN like: chdef -t group compute1 servicenode=sn1 > xcatmaster=sn1-nic. If that is the case then shouldn't DNS & DHCP still be > resolved from the SN by a node even when the MN is down? > > Thanks, > Josh > > > On Wed, Jan 8, 2014 at 6:32 PM, Xiao Peng Wang > <*w...@cn.ibm.com*<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* <w...@cn.ibm.com> > Address: 28,ZhongGuanCun Software Park,No.8 Dong Bei Wang West Road, > Haidian District Beijing P.R.China 100193 > > [image: Inactive hide details for Josh Nielsen ---2014/01/09 > 03:48:01---Hi Russell, For some reason that wiki page never came up in > my]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*<jniel...@hudsonalpha.org> > > > To: xCAT Users Mailing list > <*xcat-user@lists.sourceforge.net*<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* <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*<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. 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