Re: [CentOS-virt] Networking in KVM

On Fri, 2016-03-18 at 13:02 -0400, Mike - st257 wrote:

Paul,

On Thu, Mar 17, 2016 at 5:47 PM, Digimer lists@alteeve.ca wrote: On 17/03/16 04:47 PM, paul.greene.va@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?
    >
    > Paul

Have you verified connectivity to the VMs' default gateway? Does the ARP (address resolution protocol) process succeed? arp -a | grep <Default_Gateway_IP_here> http://linux-ip.net/html/ether-arp.html

You 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/htm...

Here's an example: ~]# cat /etc/sysconfig/network-scripts/ifcfg-XX_br0 DEVICE=XX_br0 TYPE=Bridge BOOTPROTO=static ONBOOT=yes DELAY=0 NM_CONTROLLED=no

You can temporarily add an interface to the bridge group for testing purposes though. brctl addif <bridge> <interface> http://www.tldp.org/HOWTO/BRIDGE-STP-HOWTO/set-up-the-bridge.html

    Check that they're using your static bridge. 'virsh dumpxml
    <vm>' will
    have a section like:

    ====
        <interface type='network'>
          <mac address='52:54:00:71:20:fa'/>
          <source network='bcn_bridge1' bridge='bcn_bridge1'/>
          <target dev='vnet2'/>
          <model type='e1000'/>
          <alias name='net2'/>
          <address type='pci' domain='0x0000' bus='0x00'
    slot='0x05'
    function='0x0'/>
        </interface>
    ====

    That tells you that the interface is MAC '52:54:00:71:20:fa'
    is "plugged
    in" to the bridge 'bcn_bridge1'. If that doesn't connect to
    the right
    bridge, then you need to change it (virt-manager has a simple
    to use GUI
    for this, or you can use 'virsh edit <vm>' if you're
    comfortable editing
    XML).

An additional command to run to verify your Ethernet bridge(s) operation is: brctl show brctl show <bridge>

~]# brctl show XX_br0 bridge name bridge id STP enabled interfaces XX_br0 8000.00151713fdbc no p1p1 vnet0 vnet1 vnet11 vnet12 vnet13 vnet19 vnet2 vnet4 vnet6 vnet7

-- ---~~.~~--- Mike // SilverTip257 // _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt

Hi,

You need to look at the requirements for this package. If I spin a build of that SRPM in mock I get:

Error: No Package found for aubio-devel >= 0.3.2 Error: No Package found for cwiid-devel >= 0.6.00 Error: No Package found for itstool >= 2.0.0 Error: No Package found for jack-audio-connection-kit-devel >= 1.9.10 Error: No Package found for libgnomecanvasmm26-devel >= 2.16 Error: No Package found for liblo-devel >= 0.24 Error: No Package found for liblrdf-devel >= 0.4.0 Error: No Package found for libltc-devel >= 1.1.1 Error: No Package found for lilv-devel >= 0.14.0 Error: No Package found for lv2-devel >= 1.0.0 Error: No Package found for rubberband-devel >= 1.0 Error: No Package found for serd-devel >= 0.14.0 Error: No Package found for sord-devel >= 0.8.0 Error: No Package found for sratom-devel >= 0.2.0 Error: No Package found for suil-devel >= 0.6.0

I have only checked the first, but aubio is neither in CentOS nor EPEL. Thus the failure.

Regards

Phil