[CentOS-virt] CentOS 6 and KVM woes
I have decided to migrate my latest KVM server to CentOS 6.0 and am beginning to get a little frustrated with some issues that worked perfectly in 5.6. Right now I've given up on getting virbr0 and NAT to work, but now I need networking bridging to work, but nothing seems to fix the issue. I have not had much experience with troubleshooting KVM so could really use some pointers on resolving this issue. I have successfully bridged one of the server's NICs to br0, and I can ping the IP remotely that is assigned to br0, but none of the VMs that worked in 5.6's KVM are able to access the network. Please let me know what information would be useful to troubleshoot this. Here's what I have so far... ifcfg-eth3... - DEVICE=eth3 HWADDR=00:1B:21:A1:CF:76 ONBOOT=yes BRIDGE=br0 ifcfg-br0 DEVICE=br0 TYPE=Bridge BOOTPROTO=static ONBOOT=yes IPADDR= BROADCAST= NETMASK= NETWORK= # brctl show bridge name bridge id STP enabled interfaces br0 8000.001b21a1cf76 no eth3 sysctl.conf has these 3 additional lines... net.bridge.bridge-nf-call-ip6tables = 0 net.bridge.bridge-nf-call-iptables = 0 net.bridge.bridge-nf-call-arptables = 0 Again I can ping br0's IP remotely , but no VMs assigned to it can access even that network's gateway. I have disabled iptables and ip6tables for now while trying to get this to work. The VMs , worked just fine in 5.6 and I have done nothing different but import them with virsh. Thanks - Trey ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] CentOS 6 and KVM woes
No experience with 6 here, but do your virsh-imported libvirt VM configs show devices...interface type=bridge...source bridge='br0'/ ? i.e. the bridge there matches the bridge name you're created with ifcfg scripts? Eric ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] CentOS 6 and KVM woes
On Fri, Jul 15, 2011 at 2:07 PM, Trey Dockendorf treyd...@gmail.com wrote: I have decided to migrate my latest KVM server to CentOS 6.0 and am beginning to get a little frustrated with some issues that worked perfectly in 5.6. (snip) Here's what I have so far... ifcfg-eth3... - DEVICE=eth3 HWADDR=00:1B:21:A1:CF:76 ONBOOT=yes BRIDGE=br0 ifcfg-br0 DEVICE=br0 TYPE=Bridge BOOTPROTO=static ONBOOT=yes IPADDR= BROADCAST= NETMASK= NETWORK= I do not see GATEWAY= in your ifcfg-br0. Do you actually have it? Again I can ping br0's IP remotely , but no VMs assigned to it can access even that network's gateway. Akemi ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] CentOS 6 and KVM woes
On Fri, Jul 15, 2011 at 4:20 PM, Eric Searcy emsea...@gmail.com wrote: No experience with 6 here, but do your virsh-imported libvirt VM configs show devices...interface type=bridge...source bridge='br0'/ ? i.e. the bridge there matches the bridge name you're created with ifcfg scripts? Eric ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt Yes, the name matches, the KVM hosts both used br0 on 5.6 and now on 6.0. Here's what's in the XML file interface type='bridge' mac address='52:54:00:31:6f:16'/ source bridge='br0'/ target dev='vnet0'/ model type='virtio'/ alias name='net0'/ address type='pci' domain='0x' bus='0x00' slot='0x03' function='0x0'/ /interface Thanks - Trey ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] CentOS 6 and KVM woes
On Fri, Jul 15, 2011 at 4:20 PM, Akemi Yagi amy...@gmail.com wrote: On Fri, Jul 15, 2011 at 2:07 PM, Trey Dockendorf treyd...@gmail.com wrote: I have decided to migrate my latest KVM server to CentOS 6.0 and am beginning to get a little frustrated with some issues that worked perfectly in 5.6. (snip) Here's what I have so far... ifcfg-eth3... - DEVICE=eth3 HWADDR=00:1B:21:A1:CF:76 ONBOOT=yes BRIDGE=br0 ifcfg-br0 DEVICE=br0 TYPE=Bridge BOOTPROTO=static ONBOOT=yes IPADDR= BROADCAST= NETMASK= NETWORK= I do not see GATEWAY= in your ifcfg-br0. Do you actually have it? Again I can ping br0's IP remotely , but no VMs assigned to it can access even that network's gateway. Akemi ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt The GATEWAY is specified in /etc/sysconfig/network file. Should I include it in the ifcfg-br0 as well? In CentOS 5.x I always left it in the /etc/sysconfig/network file which seems to be the default from fresh install of CentOS 6. Thanks - Trey ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] CentOS 6 and KVM woes
On 7/16/11, Trey Dockendorf treyd...@gmail.com wrote: I have successfully bridged one of the server's NICs to br0, and I can ping the IP remotely that is assigned to br0, but none of the VMs that worked in 5.6's KVM are able to access the network. Please let me know what information would be useful to troubleshoot this. Could you try creating a new VM using the GUI tool, then check if the networking works from it? I was having problems with KVM and part of the troubleshooting process got me to try it on SL6, which finally led me to discover that the command line tool generated XML doesn't work as well as the GUI tool for some reason. So there's the possibility that it could be that the definitions created through virsh in 5.6 has the same issues in CentOS 6. ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
