Verify the vhost0 interface on a compute node¶

If you have connectivity failures from a VM to the Internet, it may be caused by issues with the vhost0 interface on a compute node.

To verify the vhost0 interface on a compute node:

1. Log in to the OpenStack compute node with a failed VM.

2. Verify the status of the vhost0 interface:

   ifconfig vhost0
   

   Example of system response:

   vhost0    Link encap:Ethernet  HWaddr 0c:c4:7a:15:f8:f9
             inet addr:10.167.4.101  Bcast:10.167.4.255  Mask:255.255.255.0
             inet6 addr: fe80::ec4:7aff:fe15:f8f9/64 Scope:Link
             UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
             RX packets:45371419 errors:0 dropped:0 overruns:0 frame:0
             TX packets:11440313 errors:0 dropped:0 overruns:0 carrier:0
             collisions:0 txqueuelen:1000
             RX bytes:4598915477 (4.5 GB)  TX bytes:13876287735 (13.8 GB)
   

3. If the interface does not exist:

   1. Verify the settings of the vhost0 interface in /etc/network/interfaces.

   2. Verify the vRouter kernel modules that are currently being used:

      lsmod | grep -i -e contrail -e router
      

4. If the interface does not have an IP address:

   1. Verify the settings of the vhost0 interface in /etc/network/interfaces.

   2. Run the following command:

      ifconfig vhost0 down && ifconfig vhost0 up