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Teh is away for vacation until 5th October
by jyteh＠exabytes.com 26 Sep '13

26 Sep '13

Thank you for your message. I will be away for vacation in US from 21st Sept to 5th October. Shall you have any request , you can drop an email to my team at server-support(a)exabytes.com.my

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Re: [CentOS-virt] Upgrade of CentOS and libvirt: need help on configuring network - Solved
by Schut, Koos J J (Koos) 26 Sep '13

26 Sep '13

> I upgraded from CentOS 5.9 to CentOS 6.4. > > I try to reuse my virtual machines and am only partially successful: I > can run them, I just cannot get the network OK and need some help with that. > > > What I had in the past was pretty simple: both the host and the VM?s > used eth0 and each had an IP in the same subnet and could communicate freely. > With the new install it seems somewhat more complex and I think I need to configure a bridge and use that. > Unfortunately, info I find through google is overwhelming and > confusing. All examples either configure something else, or the outcome is not what? expected. > > > So: how to go about setting things up to have say: > > My physical machine is on 192.168.0.90 > > My Virtual machines are on 192.168.0.100 and 101. > > These are to be fixed addresses. > > The 2 VM?s have to communicate with each other and with the physical machine. > > The VM?s do not necessarily need to communicate with the rest of the world. > > The physical machine needs to communicate with the rest of the world. > > > I use: > > - CentOS-6.4_64 > > - Virtual Machine Manager 0.9.0 > > - xen 4.2.3 > > - libvirt 0.10.2.7-5 > > - VM?s show Hypervisor = xen (fullvirt) > > - Emulator = qemu-dm > > - NIC points to Shared device name virbr0 > > - on the host, virbr0 has IQ 192.168.122.1 > > > I have been fighting this for 2 weeks, now. I tried to follow several > advises which resulted in either the VM?s not connecting to anything, > or my host losing its connection to the rest of the world, or both. So either I still do something not-right, or I follow the wrong gidelines. > > > Can someone give me a push in the right direction, please? Thanks to all who responded to this: it is working now. Solution was relatively easy and mainly a matter of understanding the "ifcfg-eth0 - like" files. What I did: 1 - yum install bridge-utils 2 - change /etc/sysconfig/network-scripts/ifcfg-eth0 to: DEVICE="eth0" BOOTPROTO=none ONBOOT="yes" TYPE="Ethernet" HWADDR=xx:xx:xx:xx:xx:xx BRIDGE="br0" USERCTL=no IPV6INIT=no NM_CONTROLLED="no" 3 - change change /etc/sysconfig/network-scripts/ifcfg-br0 to: DEVICE="br0" BOOTPROTO=none ONBOOT="yes" IPADDR=192.168.0.95 NETMASK=255.255.255.0 GATEWAY=192.168.0.1 DNS1="192.168.0.1" PEERDNS="yes" TYPE="Bridge" DELAY=0 STP=off USERCTL=no IPV6INIT=no NM_CONTROLLED=no 4 - /etc/init.d/network restart 5 - choose Host device eth0 (Bridge 'br0') in the VM-manager GUI for the virtual-machine's NIC 6 - restart the virtual machines That made it all work. So what I had wrong initially were settings in the ifcfg-xxx files. There are different settings that may work and I just tried some of the not-working combinations. Cheers, Koos.

1 0

Teh is away for vacation until 5th October
by jyteh＠exabytes.com 25 Sep '13

25 Sep '13

Thank you for your message. I will be away for vacation in US from 21st Sept to 5th October. Shall you have any request , you can drop an email to my team at server-support(a)exabytes.com.my

1 0

moving the Xen4CentOS repo Kernel to 3.10.x
by Johnny Hughes 25 Sep '13

25 Sep '13

Do we want to move the Xen4CentOS kernel to new LTS 3.10.x from the current 3.4.x Kernel? If so, can we start testing the that kernel build? Is someone from Xen.org working on porting the xen specific patches that are required in the 3.10.x kernel from the ones we have in the 3.4.x tree in Xen4CentOS? The only one I know we need is the blktap module. I have created a new spec that builds a kernel with all the Xen configuration settings (except CONFIG_XEN_BLKDEV_TAP=m) Thanks, Johnny Hughes

2 1

Upgrade of CentOS and libvirt: need help on configuring network
by Schut, Koos J J (Koos) 24 Sep '13

24 Sep '13

I upgraded from CentOS 5.9 to CentOS 6.4. I try to reuse my virtual machines and am only partially successful: I can run them, I just cannot get the network OK and need some help with that. What I had in the past was pretty simple: both the host and the VM's used eth0 and each had an IP in the same subnet and could communicate freely. With the new install it seems somewhat more complex and I think I need to configure a bridge and use that. Unfortunately, info I find through google is overwhelming and confusing. All examples either configure something else, or the outcome is not what expected. So: how to go about setting things up to have say: My physical machine is on 192.168.0.90 My Virtual machines are on 192.168.0.100 and 101. These are to be fixed addresses. The 2 VM's have to communicate with each other and with the physical machine. The VM's do not necessarily need to communicate with the rest of the world. The physical machine needs to communicate with the rest of the world. I use: - CentOS-6.4_64 - Virtual Machine Manager 0.9.0 - xen 4.2.3 - libvirt 0.10.2.7-5 - VM's show Hypervisor = xen (fullvirt) - Emulator = qemu-dm - NIC points to Shared device name virbr0 - on the host, virbr0 has IQ 192.168.122.1 I have been fighting this for 2 weeks, now. I tried to follow several advises which resulted in either the VM's not connecting to anything, or my host losing its connection to the rest of the world, or both. So either I still do something not-right, or I follow the wrong gidelines. Can someone give me a push in the right direction, please? Koos

4 3

Teh is away for vacation until 5th October
by jyteh＠exabytes.com 23 Sep '13

23 Sep '13

Thank you for your message. I will be away for vacation in US from 21st Sept to 5th October. Shall you have any request , you can drop an email to my team at server-support(a)exabytes.com.my

1 0

Automatic startup xen domains
by carlopmart 18 Sep '13

18 Sep '13

Hi all, I have installed a CentOS 6.4 x86_64 host with official centos-xen packages. I am using virt-manager to create, remove, etc .. vmachines. All works really really well except automatic domains startup. Where libvirtd stores domains configurations?? Under /etc/libvirtd/qemu not, like it does when I use kvm instead of xen. Then, how can I automatic startup certain xen domains?? Thanks.

5 14

Custom CentOS
by Mr.Pine 10 Sep '13

10 Sep '13

Hi, I want to create *create custom centos iso (minimal CentOS 6.4 x64 + KVM tools). maybe I can call it custom distru. * *I appreciate any hint. * *any Idea other than kickstart ! * *TNX *

1 0

Percentage of the whole screen with spice client
by carlopmart 07 Sep '13

07 Sep '13

Hi all, Somebody knows how can I assign screen geometry as a percentage of the whole screen like rdesktop does?? For example: "spicec -g 80%". Maybe using xorg.conf specific configuration?? Thanks.

2 1

"lxc-centos" container automation script
by Johannes Graumann 03 Sep '13

03 Sep '13

Hello, For me as a debianista who has need to run some software (Kolab) in the vendor(provider)-supported OS (CentOS), LXC is a godsend. However, lxc distributions I am aware of do not ship the "lxc-fedora" or "lxc-debian" equivalent to construct a container. I have thus set out to modify the former (please find the result attached). In the process of getting that to work yum/rpm presents me with the following errors: Installing : filesystem-2.4.30-3.el6.x86_64 3/128 warning: group lock does not exist - using root warning: group mail does not exist - using root Installing : sysvinit-tools-2.87-4.dsf.el6.x86_64 47/128 warning: group tty does not exist - using root Installing : libutempter-1.1.5-4.1.el6.x86_64 59/128 warning: group utempter does not exist - using root warning: group utmp does not exist - using root Installing : util-linux-ng-2.17.2-12.9.el6_4.3.x86_64 121/128 warning: group tty does not exist - using root Installing : initscripts-9.03.38-1.el6.centos.2.x86_64 122/128 chmod: cannot access `/var/lib/random-seed': No such file or directory Non-fatal POSTIN scriptlet failure in rpm package initscripts-9.03.38-1.el6.centos.2.x86_64 warning: %post(initscripts-9.03.38-1.el6.centos.2.x86_64) scriptlet failed, exit status 1 I was wondering whether anyone here could advise on how to circumvent these issues. Optimally I'd like to prevent them (which may not be feasible given the "chroot" nature of the install). How to fix this from within a running container would also be most welcome information ... Thank you for your consideration. Sincerely, Joh

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