Nora,
Stateless image allows you to boot your slave nodes in a diskless mode,
nothing will be saved on a disk, therefore nothing will be saved in a
reboot. But to create such stateless image you need to run "genimage"
command on the xCAT management node that has the same OS as the image you
want to build. So if you want to build RHEL stateless image you have to
build it on the RHEL xCAT management node. If you want to deploy Ubuntu
VM, you would need to install Ubuntu xCAT management node, build Ubuntu
stateless image there, then copy to your RHEL management node and deploy
it.
Statefull images are more flexible, you use the same xCAT management node
to deploy slaves with different OS.
You can find the differences between stateless and statefull discussed
here:
http://xcat-docs.readthedocs.io/en/latest/guides/admin-guides/basic_concepts/node_type.html
Mark Gurevich
Poughkeepsie Development Lab
HPC Software Development - xCAT
"If we knew what it was we were doing, it would not be called research,
would it?"
--Albert Einstein
From: Nora D <[email protected]>
To: xCAT Users Mailing list <[email protected]>
Date: 03/06/2017 11:59 AM
Subject: Re: [xcat-user] vm2: Error: Cannot communicate via
libvirt to 127.0.0.1
I didn't really understand you can you please elaborate? I'm a beginner in
xCAT can you help me?
My scenario is the following:
I have an Ubuntu computer (local host) with KVM installed. Virtual
machines are created using KVM. One master node controls the other slave
nodes. So, I want to PXE boot the slave nodes and install different
operating systems depending on the user's preferences. Keeping in mind
that all of this is in one single machine.
Can you tell me how I can achieve that? In great details please with the
associated commands.
On Mar 6, 2017, at 7:50 PM, Christian Caruthers <[email protected]>
wrote:
You don't have to build the stateless image on the management node. You
can use a service node or some other surrogate running the same OS, but as
far as I know you can't build a RHEL/CentOS image on a Debian/Ubuntu host.
If you don't use stateful installs rather than stateless images, you can
have as heterogenous an environment as you like. Stateless images are
somewhat limiting.
Christian Caruthers
Lenovo Professional Services
757-289-9872
Sent from my mobile device
On Mon, Mar 6, 2017 at 10:31 AM -0500, "Nora D" <[email protected]> wrote:
What if I have one management node and several slave nodes and I want to
deploy each slave node with different OS images. How can I do that?
On Mar 6, 2017, at 6:04 PM, Christian Caruthers <[email protected]>
wrote:
You would need to either build your VMs to use Ubuntu or reinstall your
xcat management node, ideally using centos 7.3. It's a good practice to
use the same OS on the stateless images as is on the xCAT management node.
Regards,
Christian Caruthers
Lenovo xESS IT Consultant
Mobile: 757-289-9872
From: Nora D [mailto:[email protected]]
Sent: Saturday, March 4, 2017 11:12 AM
To: xCAT Users Mailing list
Subject: Re: [xcat-user] vm2: Error: Cannot communicate via libvirt to
127.0.0.1
When I generate the image using the following command:
genimage centos7.3-x86_64-netboot-compute
I get the following:
Generating image:
cd /opt/xcat/share/xcat/netboot/centos; ./genimage -a x86_64 -o centos7.3
-p compute --srcdir "/install/centos7.3/x86_64" --pkglist
/opt/xcat/share/xcat/netboot/centos/compute.centos7.pkglist --otherpkgdir
"/install/post/otherpkgs/centos7.3/x86_64" --postinstall
/opt/xcat/share/xcat/netboot/centos/compute.centos7.postinstall
--rootimgdir /install/netboot/centos7.3/x86_64/compute --tempfile
/tmp/xcat_genimage.4583 centos7.3-x86_64-netboot-compute
100 blocks
/opt/xcat/share/xcat/netboot/centos
100 blocks
/opt/xcat/share/xcat/netboot/centos
yum -y -c /tmp/genimage.4590.yum.conf
--installroot=/install/netboot/centos7.3/x86_64/compute/rootimg/
--disablerepo=* --enablerepo=centos7.3-x86_64-0 install bash
dracut-network nfs-utils openssl dhclient kernel openssh-server
openssh-clients iputils bc irqbalance procps-ng wget vim-minimal ntp rpm
rsync rsyslog e2fsprogs parted net-tools gzip tar xz
sh: 1: yum: not found
yum invocation failed
Error: Command failed: cd /opt/xcat/share/xcat/netboot/centos; ./genimage
-a x86_64 -o centos7.3 -p compute --srcdir "/install/centos7.3/x86_64"
--pkglist /opt/xcat/share/xcat/netboot/centos/compute.centos7.pkglist
--otherpkgdir "/install/post/otherpkgs/centos7.3/x86_64" --postinstall
/opt/xcat/share/xcat/netboot/centos/compute.centos7.postinstall
--rootimgdir /install/netboot/centos7.3/x86_64/compute --tempfile
/tmp/xcat_genimage.4583 centos7.3-x86_64-netboot-compute 2>&1. Error
message: 100 blocks
/opt/xcat/share/xcat/netboot/centos
100 blocks
/opt/xcat/share/xcat/netboot/centos
yum -y -c /tmp/genimage.4590.yum.conf
--installroot=/install/netboot/centos7.3/x86_64/compute/rootimg/
--disablerepo=* --enablerepo=centos7.3-x86_64-0 install bash
dracut-network nfs-utils openssl dhclient kernel openssh-server
openssh-clients iputils bc irqbalance procps-ng wget vim-minimal ntp rpm
rsync rsyslog e2fsprogs parted net-tools gzip tar xz
sh: 1: yum: not found
yum invocation failed.
I think because yum is used with redhat not Ubuntu.
How can I work around this?
From: Nora D <[email protected]>
Sent: Saturday, March 4, 2017 3:44 PM
To: xCAT Users Mailing list
Subject: Re: [xcat-user] vm2: Error: Cannot communicate via libvirt to
127.0.0.1
Great!
I will check the link.
Thank you for your help.
Sent from my iPhone
On Mar 4, 2017, at 6:41 PM, Jarrod Johnson <[email protected]> wrote:
Did you want to do stateless? If so:
https://sourceforge.net/p/xcat/wiki/Build_and_Boot_Stateless_Images/
It’s probably easiest to let it make the VMs for you. It is possible to
use existing VMs with some work, but based on your situation, I think it’s
probably easier to go with the new vm.
From: Nora D [mailto:[email protected]]
Sent: Saturday, March 04, 2017 10:24 AM
To: xCAT Users Mailing list
Subject: Re: [xcat-user] vm2: Error: Cannot communicate via libvirt to
127.0.0.1
Thank you so much you saved my life!!!!!!!
I really appreciate it.
I noticed that it creates a new VM I thought it will power off a VM that I
created myself.
Now the rpower on/off works with no error. However, I am aiming to achieve
pxe booting on the vm. Can you help me with that please?
When I execute the following command:
nodeset vm2 osimage=centos7.3-x86_64-netboot-compute
I get the following errors:
Error: Did you run "genimage" before running "packimage"? kernel cannot be
found at /install/netboot/centos7.3/x86_64/compute/kernel on
master.cluster.com
Error: Some nodes failed to set up netboot resources on server
master.cluster.com, aborting
From: Jarrod Johnson <[email protected]>
Sent: Saturday, March 4, 2017 2:54 PM
To: xCAT Users Mailing list
Subject: Re: [xcat-user] vm2: Error: Cannot communicate via libvirt to
127.0.0.1
Ah, ok.
On your xCAT system as root:
cat ~/.ssh/id_rsa.pub
This will get root’s public key. This is generic ssh setup procedure to
establish secure passwordless ssh. You would want to copy that output to
clipboard or whatever is most convenient for you.
On your desktop:
Make sure .ssh exists (it probably does already)
mkdir –p /root/.ssh
Set the permissions so that only root has read write and execute (using
the octal notation for the permission mask, if you want to research chmod
more you can get an idea of how the scheme works)
chmod 700 /root/.ssh/
Edit the file /root/.ssh/authorized_keys
This is a text file, so any text editor will work. Then you can paste
into the file just like any other text file.
Chmod 600 /root/.ssh/authorized_keys
This will assure the permissions on that file are acceptable to sshd
(depending on configuration, it may refuse to read the file unless
permissions are this limited)
From: Nora D [mailto:[email protected]]
Sent: Saturday, March 04, 2017 9:48 AM
To: xCAT Users Mailing list
Subject: Re: [xcat-user] vm2: Error: Cannot communicate via libvirt to
127.0.0.1
No I'm just a student working on a project to simulate dynamic
provisioning in an HPC environment that's why I'm using virtual machines
to simulate the environment. I am using Vagrant along with xCAT to do
that.
Sent from my iPhone
On Mar 4, 2017, at 5:38 PM, Jarrod Johnson <[email protected]> wrote:
BTW, is this to evaluate xCAT for other purposes, or to do virtual machine
management specifically? It may help to understand the goal in terms of
best way to proceed.
From: Nora D [mailto:[email protected]]
Sent: Saturday, March 04, 2017 9:34 AM
To: xCAT Users Mailing list
Subject: Re: [xcat-user] vm2: Error: Cannot communicate via libvirt to
127.0.0.1
Ok I will try it. But can you please write the commands for me in a
simpler way?
Because I'm so new to Linux I'm afraid I might mess things up.
I would really appreciate it.
On Mar 4, 2017, at 5:25 PM, Jarrod Johnson <[email protected]> wrote:
With or without password?
On the xcat vm, cat ~/.ssh/id_rsa.pub
Add that to ~/.ssh/authorized_keys on the desktop
If you don’t have that already, you’ll want to mkdir ~/.ssh, chmod 700
~/.ssh, create that file and chmod 600 ~/.ssh/authorized_keys
From: Nora D [mailto:[email protected]]
Sent: Saturday, March 04, 2017 9:19 AM
To: xCAT Users Mailing list
Subject: Re: [xcat-user] vm2: Error: Cannot communicate via libvirt to
127.0.0.1
I was able to ssh to 10.0.0.10 but to to 192.168.122.1.
(myUsername)@10.0.0.1 <<< that was successful
(myUsername)192.168.122.1 <<< Permission denied, please try again.
Although yesterday I was able to ssh 192.168.122.1 but I don't know what
happened today I might've changed something..
From: Jarrod Johnson <[email protected]>
Sent: Saturday, March 4, 2017 2:09 PM
To: xCAT Users Mailing list
Subject: Re: [xcat-user] vm2: Error: Cannot communicate via libvirt to
127.0.0.1
Can you ssh to 10.0.0.10 or 192.168.122.1 from the virtual machine?
From: Nora D [mailto:[email protected]]
Sent: Saturday, March 04, 2017 9:04 AM
To: xCAT Users Mailing list
Subject: Re: [xcat-user] vm2: Error: Cannot communicate via libvirt to
127.0.0.1
Still getting the same error.
I set vmhost=10.0.0.10
And vmnics=virbr2
:(?!
On Mar 4, 2017, at 5:02 PM, Nora D <[email protected]> wrote:
Nevermind "thehost" I was assuming that I could add 192.168.122.1 to the
hosts file. I removed it know and set the vmhost=192.168.122.1
On Mar 4, 2017, at 4:58 PM, Nora D <[email protected]> wrote:
Here is "ip addr" from my desktop:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp2s0f0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state
DOWN group default qlen 1000
link/ether c8:2a:14:37:20:0c brd ff:ff:ff:ff:ff:ff
3: wlp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UP group default qlen 1000
link/ether e4:ce:8f:15:fb:12 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.68/24 brd 192.168.1.255 scope global dynamic wlp3s0
valid_lft 84106sec preferred_lft 84106sec
inet6 fe80::e73a:370a:d3bb:1037/64 scope link
valid_lft forever preferred_lft forever
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
state DOWN group default qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
5: virbr0-nic: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc
pfifo_fast master br1 state DOWN group default qlen 1000
link/ether 52:54:00:81:29:75 brd ff:ff:ff:ff:ff:ff
7: br1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state
DOWN group default qlen 1000
link/ether 52:54:00:81:29:75 brd ff:ff:ff:ff:ff:ff
8: virbr1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UP group default qlen 1000
link/ether fe:54:00:1c:fb:c0 brd ff:ff:ff:ff:ff:ff
inet 192.168.121.1/24 brd 192.168.121.255 scope global virbr1
valid_lft forever preferred_lft forever
9: virbr1-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN
group default qlen 1000
link/ether 52:54:00:fd:f8:10 brd ff:ff:ff:ff:ff:ff
10: virbr2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UP group default qlen 1000
link/ether fe:54:00:3f:cb:cc brd ff:ff:ff:ff:ff:ff
inet 10.0.0.1/24 brd 10.0.0.255 scope global virbr2
valid_lft forever preferred_lft forever
11: virbr2-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN
group default qlen 1000
link/ether 52:54:00:79:0c:4a brd ff:ff:ff:ff:ff:ff
18: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
master virbr1 state UNKNOWN group default qlen 1000
link/ether fe:54:00:6e:fa:04 brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc54:ff:fe6e:fa04/64 scope link
valid_lft forever preferred_lft forever
19: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
master virbr2 state UNKNOWN group default qlen 1000
link/ether fe:54:00:fb:04:c8 brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc54:ff:fefb:4c8/64 scope link
valid_lft forever preferred_lft forever
20: vnet2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
master virbr1 state UNKNOWN group default qlen 1000
link/ether fe:54:00:1c:fb:c0 brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc54:ff:fe1c:fbc0/64 scope link
valid_lft forever preferred_lft forever
21: vnet3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
master virbr2 state UNKNOWN group default qlen 1000
link/ether fe:54:00:94:74:6b brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc54:ff:fe94:746b/64 scope link
valid_lft forever preferred_lft forever
22: vnet4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
master virbr1 state UNKNOWN group default qlen 1000
link/ether fe:54:00:b6:a8:b6 brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc54:ff:feb6:a8b6/64 scope link
valid_lft forever preferred_lft forever
23: vnet5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
master virbr2 state UNKNOWN group default qlen 1000
link/ether fe:54:00:3f:cb:cc brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc54:ff:fe3f:cbcc/64 scope link
valid_lft forever preferred_lft forever
And here's from my virtual machine:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state
UP group default qlen 1000
link/ether 52:54:00:1c:fb:c0 brd ff:ff:ff:ff:ff:ff
inet 192.168.121.153/24 brd 192.168.121.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe1c:fbc0/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state
UP group default qlen 1000
link/ether 52:54:00:94:74:6b brd ff:ff:ff:ff:ff:ff
inet 10.0.0.10/24 brd 10.0.0.255 scope global eth1
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe94:746b/64 scope link
valid_lft forever preferred_lft forever
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
state DOWN group default
link/ether 6e:3e:9c:b1:5c:77 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
And here's the "lsdef vm2":
root@master:~# lsdef vm2
Object name: vm2
groups=compute,all
installnic=mac
mac=52:54:00:fb:04:c8
mgt=kvm
netboot=pxe
postbootscripts=otherpkgs
postscripts=syslog,remoteshell,syncfiles
primarynic=mac
serialport=0
serialspeed=115200
vmcpus=2
vmhost=thehost
vmmemory=1024
vmnicnicmodel=virtio
vmnics=virbr0
From: Jarrod Johnson <[email protected]>
Sent: Saturday, March 4, 2017 1:38 PM
To: xCAT Users Mailing list
Subject: Re: [xcat-user] vm2: Error: Cannot communicate via libvirt to
127.0.0.1
On the desktop system, run ip addr
Also run it inside the virtual machine.
There should be an address that starts with the same bytes. Use the value
from the desktop as ‘vm.host’
From: Nora D [mailto:[email protected]]
Sent: Saturday, March 04, 2017 8:35 AM
To: xCAT Users Mailing list
Subject: Re: [xcat-user] vm2: Error: Cannot communicate via libvirt to
127.0.0.1
How can I do that?
On Mar 4, 2017, at 4:26 PM, Jarrod Johnson <[email protected]> wrote:
What is the address of your desktop relative to the xcat master?
xCAT master reaching out to 127.0.0.1 will address the virtual machine
itself, rather than your desktop.
From: Nora D [mailto:[email protected]]
Sent: Saturday, March 04, 2017 8:21 AM
To: xCAT Users Mailing list
Subject: Re: [xcat-user] vm2: Error: Cannot communicate via libvirt to
127.0.0.1
I didn't get your answer can you elaborate please what should I do?
I have xCAT on a master VM not on the hypervisor which is my localhost
machine.
The issue is frustrating me please help me.
Sent from my iPhone
On Mar 4, 2017, at 4:18 PM, Jarrod Johnson <[email protected]> wrote:
Nodels vm2 vm.host
Note you do not need xcat on the hypervisors, you anly need it in one
place.
From: Nora D [mailto:[email protected]]
Sent: Saturday, March 04, 2017 2:56 AM
To: [email protected]
Subject: [xcat-user] vm2: Error: Cannot communicate via libvirt to
127.0.0.1
I have Ubuntu 16 LTS (Desktop) as my local host machine. I installed KVM
to create virtual machines.
I have 3 virtual machines; one of them is acting as a master node to
control the other slave nodes (xCAT installed in the master node to
control the slaves).
When I try to rpower off a slave node from the master node, the following
error occurs:
vm2: Error: Cannot communicate via libvirt to 127.0.0.1
When I researched there were many probabilities that may cause the issue:
unauthorized ssh, firewall, ports, etc.
I tried a lot of things but I felt lost and I'm just a beginner to the
open-source world. Can someone help me please with exact details and
specific commands?
Also, is there any way that I can reset my libvirt settings to the default
settings? Because I think I messed up some stuff which made the libvirt
service won't start.
Please help me ASAP.
Thanks.
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