Hi Lissa,
Thanks for the help and clarification! I've been able to get service nodes
operating properly, just trying to understand some of my questions better.
Let me see if I can help clarify and perhaps simplify the questions. I know
some of my email appeared to be rambling :-)
* My first question is, why does doing nodeset's for a node seem to send
that nodeset to *all* service nodes, regardless of what servicenode a node
is assigned to? I would think that if a node is only assigned to the
management node, a nodeset to that node would only go to the management
node, not Service01 as well. However when I have, for example, c1n01
assigned to no service nodes at all, doing a nodeset on c1n01 has both the
management node and Service01 responding to the command. I see that c1n01 is
getting its /tftpboot/pxelinux.cfg/c1n01 file written out on Service01, even
though "disjointhcps" is set to "1". This node should never be able to boot
from Service01 as a result. Why is Service01 writing out the configs for
c1n01?
*Question 2: When *not* using service node pools, can you assign a compute
node to more than one service node? If so, what would the noderes table look
like for that? The documentation I read seems to show only assigning one
service node to a compute node.
Here is my lsdef service:
[root@mn ~]# lsdef service
Object name: service01
arch=x86_64
currchain=boot
currstate=boot
groups=service,all
initrd=xcat/centos5.5/x86_64/initrd.img
interface=eth0
ip=192.168.1.10
kcmdline=nofb utf8 ks=http://mn/install/autoinst/service01 ksdevice=eth0
noipv6
kernel=xcat/centos5.5/x86_64/vmlinuz
mac=00:50:56:11:11:13
mgt=ipmi
monserver=mn
netboot=pxe
nfsserver=mn
nodetype=osi
os=centos5.5
postbootscripts=otherpkgs
postscripts=updaterepos.sh,syslog,remoteshell,syncfiles,updaterepos.sh,servicenode,xcatserver,xcatclient
power=ipmi
primarynic=eth0
profile=service
provmethod=install
servicenode=mn
setupdhcp=1
setupftp=1
setupnameserver=1
setuptftp=1
status=booted
statustime=07-14-2011 11:35:13
xcatmaster=mn
Here is my lsdef for c1n01. As you can see it is not assigned to a
servicenode:
[root@mn ~]# lsdef -t node -o c1n01
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
status=booted
statustime=07-15-2011 18:32:09
However when doing a nodeset, both the management node and Service01
respond:
[root@mn ~]# nodeset c1n01 install
c1n01: install centos5.5-x86_64-compute
c1n01: install centos5.5-x86_64-compute
I am running MySQL as the database and latest xCAT 2.5 for both the
management node and Service01. My compute nodes, management node, and
service node are all sharing the same flat network. Like I stated,
everything is working properly on my setup as far as assigning nodes to
Service01 and booting them from Service01, just trying to understand better
how service node pools and statically assigning specific nodes to a service
node work, and the behavior of them (as mentioned in my above questions).
Thanks so much for your patience and assistance!
On Tue, Jul 19, 2011 at 7:46 AM, Lissa Valletta <[email protected]> wrote:
>
> For either nodes assigned to a specific service node or a pool of service
> nodes, you always run the commands on the Management Node. xCAT will
> figure out which service node will run the command and automatically send
> it there. You do not run these commands on the Service Node yourself in
> either case. For pools, it will pick the first one available.
> I would suggest you try just one service node first before using pools.
> Take one of your nodes and assign a single service node.
> Also maybe we should check your service node setup.
>
> Run lsdef service
> Can you ssh to service10 and not be prompted for a password.
> When on service10 can you tabdump site and get to the database on the
> Management Node?
> What database are you running?
> Also give me the output of rpm -qa | grep xCAT from the Service node and
> the Management Node.
> Are your nodes connected only to the Service node or are they actually
> connected to the Management Node also. From what you say, you may not
> be using the service node at all.
>
> 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: 07/18/2011 08:07 PM
> Subject: Re: [xcat-user] Confused regarding service node pools and
> defining specific service nodes
>
>
>
> 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: pic04821.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!
>
>
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