To enable DHCP service on SN can be done by configuring the servicenode table or setupdhcp attribute of SN node.
To enable DNS service which can be running without MN, you need to enable DSN server on SN in slave mode. It will available in 2.8.4 realease. Refer to Option #3.2 in https://sourceforge.net/apps/mediawiki/xcat/index.php?title=Cluster_Name_Resolution#Option_.233:_Run_DNS_on_Management_Node_and_Service_Nodes 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 From: Lissa Valletta <lis...@us.ibm.com> To: xCAT Users Mailing list <xcat-user@lists.sourceforge.net>, Cc: xCAT Users Mailing list <xcat-user@lists.sourceforge.net> Date: 2014/01/11 03:26 Subject: Re: [xcat-user] How to create and deploy an xCAT Service Node 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 Inactive hide details for Josh Nielsen ---01/10/2014 12:59:12 PM---Hi Wang Xiaopeng (I apologize if I got your name wrong beforJosh 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> 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 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> 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
<<inline: graycol.gif>>
------------------------------------------------------------------------------ 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
