Re: [CentOS-virt] Networking in KVM

[paul . greene . va]

Thanks all for the suggested tips. I confess I tried VMWare hypervisor esxi and found it less complicated to get set up and functioning correctly. I'll have to take up KVM another day, when I'm in less of a hurry to get something up and running right away.   On 03/18/16, Mike - st257 wrote: Paul,On Thu, Mar 17, 2016 at 5:47 PM, Digimer  wrote:On 17/03/16 04:47 PM, paul.greene...@verizon.net wrote:> Thanks, I followed the 2nd article, and it got the existing virtual> machines communicating with each other.Right, so your VMs are on the same bridge group now (at Layer2 of OSI). >> However, any new virtual machines I created after making the changes> can't communicate with anything, they can't even get out to the> internet, even if I manually set the IP address info. Any suggestions on> that?>> PaulHave you verified connectivity to the VMs' default gateway?Does the ARP (address resolution protocol) process succeed?arp -a | grep http://linux-ip.net/html/ether-arp.htmlYou may not have a NIC connected to your physical network in that bridge group.If so you need to modify your network-scripts to make that happen automatically on boot.You do not necessarily need an IP address on your bridge interface unless the VM host is acting as a router (default gateway).https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/s2-networkscripts-interfaces_network-bridge.htmlHere's an example:~]# cat /etc/sysconfig/network-scripts/ifcfg-XX_br0 DEVICE=XX_br0TYPE=BridgeBOOTPROTO=static_ONBOOT_=yesDELAY=0NM_CONTROLLED=noYou can temporarily add an interface to the bridge group for testing purposes though.brctl addif  http://www.tldp.org/HOWTO/BRIDGE-STP-HOWTO/set-up-the-bridge.html Check that they're using your static bridge. 'virsh dumpxml ' willhave a section like:                                        function='0x0'/>    That tells you that the interface is MAC '52:54:00:71:20:fa' is "pluggedin" to the bridge 'bcn_bridge1'. If that doesn't connect to the rightbridge, then you need to change it (virt-manager has a simple to use GUIfor this, or you can use 'virsh edit ' if you're comfortable editingXML).An additional command to run to verify your Ethernet bridge(s) operation is:brctl showbrctl show ~]# brctl show XX_br0bridge name bridge id  STP enabled interfacesXX_br0  8000.00151713fdbc no  p1p1   vnet0   vnet1   vnet11   vnet12   vnet13   vnet19   vnet2   vnet4   vnet6   vnet7-- ---~~.~~---Mike//  SilverTip257  //___CentOS-virt mailing listCentOS-virt@centos.orghttps://lists.centos.org/mailman/listinfo/centos-virt
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Re: [CentOS-virt] Networking in KVM

[paul . greene . va]

Thanks, I followed the 2nd article, and it got the existing virtual machines communicating with each other.However, any new virtual machines I created after making the changes can't communicate with anything, they can't even get out to the internet, even if I manually set the IP address info. Any suggestions on that?Paul  On 03/15/16, Digimer wrote: On 15/03/16 08:07 PM, paul.greene...@verizon.net wrote:> Hi all,> > New to KVM. Did a group install for "Virtualization Host" on CentOS 7.> Created two virtual machines - one with centos and one with an> evaluation copy of Windows 2012 server.>  > Both virtual machines correctly did updates out to their respective> vendors (Centos and MS respectively), but they can't talk to each other> or talk to any other system in my internal network. From what I've found> so far, if I understand correctly, this is the default behaviour for KVM> out of the box.> > What I would like to be able to do is allow the virtual machines to> appear on my internal network just like any other machine, in the same> IP address space, without using dhcp for assigning addresses. The KVM> machines are using 192.168.122.x, my other machines are using 192.168.1.x.> > Any guidance/suggestions greatly appreciated.> > Paul GreeneYou need a traditional bridge (that acts more like a network switch).A quick google turns up these, which might help:http://jensd.be/207/linux/install-and-use-centos-7-as-kvm-virtualization-hosthttp://unix-linux-server.blogspot.ca/2014/10/centos-7-kvm-installation-and-bridge.html-- DigimerPapers and Projects: https://alteeve.ca/w/What if the cure for cancer is trapped in the mind of a person withoutaccess to education?___CentOS-virt mailing listCentOS-virt@centos.orghttps://lists.centos.org/mailman/listinfo/centos-virt
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[CentOS-virt] Networking in KVM

[paul . greene . va]

Hi all, New to KVM. Did a group install for "Virtualization Host" on CentOS 7. Created two virtual machines - one with centos and one with an evaluation copy of Windows 2012 server. Both virtual machines correctly did updates out to their respective vendors (Centos and MS respectively), but they can't talk to each other or talk to any other system in my internal network. From what I've found so far, if I understand correctly, this is the default behaviour for KVM out of the box.What I would like to be able to do is allow the virtual machines to appear on my internal network just like any other machine, in the same IP address space, without using dhcp for assigning addresses. The KVM machines are using 192.168.122.x, my other machines are using 192.168.1.x.Any guidance/suggestions greatly appreciated.Paul Greene
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[CentOS-virt] Trouble installing KVM

[paul . greene . va]

Hello All,I'm trying to install KVM on a test CentOS 6 server, running the following command, and getting the following result. I suspect the repositories my system is trying to reach out to aren't carrying the packages for KVM, but I'm not sure.Not sure what to do from here.Paul[root@centos-server yum.repos.d]# yum groupinstall "Virtualization Platform"Loaded plugins: fastestmirror, refresh-packagekit, securitySetting up Group ProcessLoading mirror speeds from cached hostfile * base: mirror.netdepot.com * extras: mirror.dattobackup.com * updates: mirror.vtti.vt.eduPackage libvirt-client-0.10.2-54.el6.i686 already installed and latest versionPackage libvirt-0.10.2-54.el6.i686 already installed and latest versionWarning: Group virtualization-platform does not have any packages.No packages in any requested group available to install or update
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[CentOS] Boot failures

[Paul Greene]

Hello All,

I was having some issues with samba configuration and was going to 
remove the packages and reinstall again.

I think I might have rebooted before all of the package removal tasks 
were finished running and might have corrupted something.

The system successfully boots up to the grub menu, but after that the 
boot process stalls when the centos logo comes up. I can't boot into 
single user mode either.

I'd rather not have to re-install the OS. What, if any, options are 
available at this point?

CentOS version is 6.3.

Thanks in advance for any tips.

Sam
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