Service Node pools are supported for diskfull node installs. One other check is sharedtftp=0 in the site table, otherwise chdef -t site -o clustersite sharedtftp=0
The noderes table defines the servicenode assignment for nodes. So you would define a nodegroup and put it in the noderes table with the list of service nodes you want to assign to it. The below error sound like a name resolution problem during the install. Since you are using hostnames not ip addresses for your servicenode attribute you need to make sure that the hostnames - service10,service11 resolves to an ip address that is known by the node during install. Did you setup nfs on your servicenodes. Set the servicenode.nfsserver attribute and restartxcatd on the servicenode will do it. Did this error happen on a nodeset c1n01 install command ? Lissa K. Valletta 2-3/T12 Poughkeepsie, NY 12601 (tie 293) 433-3102 From: Dave Barry <[email protected]> To: xCAT Users Mailing list <[email protected]> Date: 07/19/2011 08:00 PM Subject: Re: [xcat-user] Confused regarding service node pools and defining specific service nodes Linda and Lissa, You all have been extremely helpful, thank you very much! I've just about got all of this worked out in my head. Just one final minor question. In a service node pool architecture, if I wanted a specific group of nodes to only be able to netboot from a specific group of service nodes, would the correct method of handling this be to set disjointdhcps to "1", and then define the service nodes I would like that group to boot from in noderes? Or is there a better configuration somewhere for this? Also, when setting a node to install, the following error was emitted: c1n01: Error: Unable to find requested nfsserver from noderes, with node=c1n01 Error: Some nodes failed to set up install resources, aborting c1n01: Error: Unable to find requested nfsserver from noderes, with node=c1n01 Error: Some nodes failed to set up install resources, aborting c1n01: Error: Unable to find requested nfsserver from noderes, with node=c1n01 Error: Some nodes failed to set up install resources, aborting Are service node pools designed only for diskless nodes? On Tue, Jul 19, 2011 at 10:14 AM, Linda Mellor <[email protected]> wrote: Dave, Let me try to explain a little more for you. I understand all the questions and that this can be confusing -- xCAT can behave differently based on various settings, and it's difficult for us to document this well for all cases. First, some attributes that are of interest: site attributes: (lsdef -t site -h) master - your xCAT management node (MN) dhcpsetup - use default of "y" (no value) to have xCAT manage DHCP for you dhcpinterfaces - the interfaces DHCP should listen on. This should have separate entries for your MN and for your service nodes (SNs). It will be used to configure the dhcpd.conf files on the respective servers to only listen on those network interfaces. It is important to get this correct, and you should verify the network definitions created by 'makedhcp -n' in the respective dhcpd.conf files on your MN and SNs. disjointdhcps - use default of "n" (no value) to have xCAT put an entry in EVERY dhcpd.leases file for EVERY node on EVERY MN, SN sharedtftp - use default of "y" (no value) to have the /tftpboot directory mounted from the MN to every SN tftpdir - the /tftpboot directory to use installloc - "/install" means that all SNs will mount /install from the MN. No value means that the SNs will have a local /install directory which must be kept in sync from the MN for many xCAT commands installdir - the /install directory to use network attributes: (lsdef -t netwwork -h) dhcpserver - the DHCP server that will serve dynamic IPs for this network. (required when there are multiple DHCP servers on the network and a dynamicrange is specified) tftpserver - the tftpserver for this network. Typically, you will want to set the node tftpserver attribute and leave this one blank. gateway - set to value "<xcatmaster>" to have each DHCP servers dhcpd.conf "option routers" set to itself. dynamicrange - only set if you need to serve dynamic IP addresses on this network node attributes: (lsdef -t node -h) servicenode - the xCAT node name of the service node (as known by the MN) for this node. If not set, will default to site.xcatmaster. Set to list for service node pools. xcatmaster - the service node interface this node will use to communicate to the SN (will be different from servicenode if the MN-to-SN and SN-to-compute node are on different networks). If not set, will default to servicenode. Keep blank for service node pools. tftpserver - the tftpserver for this compute node. In most cases, you should explicitly set this to your xcatmaster value for service node support. Keep blank for service node pools. nfsserver - the server that will serve nfs, http, etc., for node deployment. If not set, will default to xcatmaster. Keep blank for service node pools. service node attributes: (lsdef -t node -h) These should all be set to "1" to have the service node handle these services for their compute nodes: setupdhcp setuptftp setupftp setupnfs And the network possibilities with all of this can start to be mind-boggling, but we try to address the most common ones as best we can: - the entire cluster on one flat network. This means there will be multiple DHCP servers (and tftp servers), and xCAT needs to configure any DHCP server to respond correctly to a broadcast request on the network, so all dhcpd.leases files will need to be identical, with the "next-server" value set to the designated tftpserver for a given node. - the MN to SNs on one network, and the SNs to CNs all on a separate flat network. Two possibilities here: - specific DHCP servers for different sets of compute nodes. DHCP configuration handled same as previous case. xCAT will use the servicenode attribute as the service node to handle hierarchical xCAT runtime management commands (such as xdsh, nodestat, updatenode, etc.) - pooled DHCP servers so any server in the list can serve any compute node on the network -- the first DHCP server to respond will also be that node's tftpserver, nfsserver, xcatmaster, etc.. xCAT will use the first servicenode in this list for hierarchical xCAT commands (to manage performance of these cmds, you may want to set different groups of nodes to a different order of servicenodes) - The MN to SNs on one network, each SN to its CNs on separate networks -- the DHCP server on that network needs to only manage its set of compute nodes. So, because of all the different possibilities, the xCAT makedhcp and nodeset commands for any node are run on the MN and EVERY SN for EVERY node. We try to be a little smarter in some cases where we can and where it is important to get the correct server values set, but will typically default to just doing everything everywhere. And depending on whether you are using sharedtftp or not, you may see different results in your /tftpboot/etc files and other places. Also, if your /install directory is local on your SNs, after MN commands such as genimage, packimage, liteimg, updating postscripts, or making changes to other files in /install, you need to rsync /install out to all service nodes to make sure nodeset and other commands have the correct data to work with. For your question: "Can you define more than one statically assigned Service Node to a compute node?" the answer is "No". You can either have 1 static service node, or use service node pools. We do support a manual "snmove" command to move a compute node from one static service node to another. In all cases, xCAT is designed so that all xCAT commands are run from the MN. xCAT will do all internal remote communications to the SNs as needed and consolidate/process the results. Hope all of this helped more than it added more confusion to the mix. If you have a specific end-result you're trying to achieve, let us know, and we'll try to help you figure out how the xcat database should be set to accomplish that (if possible). Linda (Embedded image moved to file: pic24285.gif)Inactive hide details for Dave Barry ---07/18/2011 11:41:56 AM---Thanks! I am just trying to understand this part of xCAT more Dave Barry ---07/18/2011 11:41:56 AM---Thanks! I am just trying to understand this part of xCAT more clearly so that I can make the correct (Embedded (Embedded image moved to file: pic04287.gif) image moved Dave Barry <[email protected]> to file: pic18743.gi f) From: (Embedded (Embedded image moved to file: pic40288.gif) image moved xCAT Users Mailing list <[email protected]> to file: pic47151.gi f) To: (Embedded (Embedded image moved to file: pic55492.gif) image moved 07/18/2011 11:41 AM to file: pic61085.gi f) Date: (Embedded (Embedded image moved to file: pic65389.gif) image moved Re: [xcat-user] Confused regarding service node pools and to file: defining specific service nodes pic63709.gi f) Subject: Thanks! I am just trying to understand this part of xCAT more clearly so that I can make the correct decisions for my setup. So let me make sure I have this straight, please feel free to correct as needed: For any nodes who are specifically assigned a service node (as opposed to assigned to a service node pool), their management commands (such as nodeset etc.) should be ran on the Service Node they are assigned to, and not the Management Node. - I did notice that when defining the "xcatmaster" in noderes for this compute node as its service node, even though the management node could still DHCP boot the node, the imgurl for where to pull the netboot image was statically assigned to the service node. When using service node pools, it becomes a first-come, first-serve basis, in that any service node will have its imgurl defined back to itself in /tftpboot, so that if that service node ends up being the one that pxe boots the compute node, it essentially becomes that compute node's master. Management commands should be ran on the management node instead of the service node in a service node pool architecture. Correct? Questions: Can you define more than one statically assigned Service Node to a compute node? How would the imgurl that is defined in tftpboot be handled in this situation? I cannot seem to figure out how the "servicenode" column actually comes into play in the various services configuration. I even tried putting fake service node hostnames in there that do not exist, and was still able to makedhcp, nodeset, and boot both diskless and install diskful nodes from either service node or master node with, what appeared to be, no ill effects. What does this column actually affect, and when does it come into play in fail over situations? Sorry for the multiple questions, just trying to gather as much information as possible =) I've read the service node pools documentation and unfortunately, unless I missed something, it doesn't seem to go into as much depth as I am trying to gather. Here are my lsdef's. c1n01 is a diskful install, and c1n02 is a diskless node. I was able to successfully boot c1n02 from service01, which is not defined as that compute node's service node, without an issue. I even made sure it was booting from service01 by stopping dhcp on the master node. That's what is confusing to me... it would seem to me that if I have service10 and service11 defined as c1n02's service nodes (which by the way are non-existant service nodes), service01 wouldn't care about c1n02 and as a result wouldn't create the tftpboot/dhcp configuration needed for that node, only service10/11 would (if they existed). What is the actual purpose of the servicenode column in noderes in a service node pool setup? Object name: c1n01 arch=x86_64 chain=runcmd=standby currchain=boot currstate=install centos5.5-x86_64-compute groups=compute,all initrd=xcat/centos5.5/x86_64/initrd.img installnic=eth0 interface=eth0 ip=192.168.1.2 kcmdline=nofb utf8 ks=http://mn/install/autoinst/c1n01 ksdevice=eth0 noipv6 kernel=xcat/centos5.5/x86_64/vmlinuz mac=00:50:56:11:11:11 mgt=ipmi netboot=pxe nfsserver=mn nodetype=osi ondiscover=nodediscover os=centos5.5 postbootscripts=otherpkgs postscripts=updaterepos.sh,syslog,remoteshell,syncfiles power=ipmi primarynic=eth0 profile=compute provmethod=install servicenode=service10,service11 status=booted statustime=07-15-2011 18:32:09 [root@mn ~]# lsdef c1n02 Object name: c1n02 arch=x86_64 chain=runcmd=standby currchain=boot currstate=netboot centos5.5-x86_64-compute groups=compute,all initrd=xcat/netboot/centos5.5/x86_64/compute/initrd-stateless.gz installnic=eth0 interface=eth0 ip=192.168.1.3 kcmdline=imgurl=http://!myipfn!/install/netboot/centos5.5/x86_64/compute/rootimg.gz XCAT=!myipfn!:3001 ifname=eth0:00:50:56:11:11:15 netdev=eth0 kernel=xcat/netboot/centos5.5/x86_64/compute/kernel mac=00:50:56:11:11:15 mgt=ipmi netboot=pxe nodetype=osi ondiscover=nodediscover os=centos5.5 postbootscripts=otherpkgs postscripts=updaterepos.sh,syslog,remoteshell,syncfiles power=ipmi primarynic=eth0 profile=compute provmethod=netboot servicenode=service10,service11 status=booted statustime=07-17-2011 20:29:51 Thanks! On Mon, Jul 18, 2011 at 7:31 AM, Lissa Valletta <[email protected]> wrote: So first do you really want service node pools or as you indicate below you just want to assign a compute node to a particular service. If you check this link the two sections have a description of setting up Service Nodes and pools: https://sourceforge.net/apps/mediawiki/xcat/index.php?title=Setting_Up_a_Linux_Hierarchical_Cluster#Assigning_Nodes_to_their_Service_Nodes_.28_updating_the_noderes_table.29 If you want compute1 to just use the Management Node, you do not have to put anything in the noderes table for it. That will be the default, or just assign the xcatmaster attribute to the Management node as know by compute1. If not a pool then in the noderes table: The servicenode attribute for a compute node should be set to the hostname of the service node(s) that the management node knows it by. The xcatmaster attribute in the noderes table should be set to the hostname of the service node that the compute node knows it by. Make sure your service node is defined in the servicenode table. For pools, make sure you note this restriction. Note: the noderes table's xcatmaster, tftpserver,nfsserver attributes should be blank for any node entry that has the noderes servicenode attribute set to a pool of service nodes. The command(s) that is reference, is all xCAT commands that will actually be run on the servicenode at this point instead of the Management Node, because the Service Node is the master of the compute node. Some examples are your nodeset , nodestat, xdsh. Some of these commands do some work on the Management Node ( our preprocess setup) before the actual executing the real work on the Service Node. Also run lsdef compute1 and lsdef compute2, we can check the entire setup from that output. Lissa K. Valletta 2-3/T12 Poughkeepsie, NY 12601 (tie 293) 433-3102 (Embedded image moved to file: pic48824.gif)Inactive hide details for Dave Barry ---07/17/2011 05:45:56 PM---Hello! I am attempting to understand how to manually lay out sDave Barry ---07/17/2011 05:45:56 PM---Hello! I am attempting to understand how to manually lay out specific service nodes From: Dave Barry <[email protected]> To: [email protected] Date: 07/17/2011 05:45 PM Subject: [xcat-user] Confused regarding service node pools and defining specific service nodes Hello! I am attempting to understand how to manually lay out specific service nodes that are responsible to specific compute nodes, but am having a hard time doing so. I read the following paragraph: To define a list of service nodes that support a set of compute node(s), in the noderes table, in the service node attribute, put a comma-delimited list of the service nodes. The list will be processed left to right, picking the first service node on the list to run the command. If that service node is not available, then the next service node on the list will be chosen until the command is successful. Errors will be logged. If no service node on the list can process the command, then the error will be returned. You can provide some load-balancing by assigning your service nodes as we do below. I have tried manually defining my node "compute1" to have its servicenode (in the noderes table) to be my masternode, and then defining compute2 to have its servicenode be sn1. However when I run "nodeset compute1 netboot" the command appears to be sent to both the master node and the service node. The same happens if I do "nodeset compute2 netboot". The /tftpboot files and /install/autoinst files are written out on both the masternode and service node as if xcat is ignoring the fact that I have separated these two compute nodes to different service nodes. I am successfully able to netboot compute1 from service01 without any problems. DHCP from service01 will happily respond and boot this node even though it is not assigned as this node's servicenode. Am I misunderstanding how this is supposed to work? Also: "The list will be processed left to right, picking the first service node on the list to run the command. If that service node is not available, then the next service node on the list will be chosen until the command is successful." What "command" is this documentation referring to? Thanks! ------------------------------------------------------------------------------ AppSumo Presents a FREE Video for the SourceForge Community by Eric Ries, the creator of the Lean Startup Methodology on "Lean Startup Secrets Revealed." 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