5.5. Hosts and Networking

Procedure 5.19. To Refresh Host Capabilities

1. Use the resource tabs, tree mode, or the search function to find and select a host in the results list.
2. Click the Refresh Capabilities button.

Procedure 5.20. Editing Host Network Interfaces and Assigning Logical Networks to Hosts

1. Click the Hosts resource tab, and select the desired host.
2. Click the Network Interfaces tab in the details pane.
3. Click the Setup Host Networks button to open the Setup Host Networks window.
4. Attach a logical network to a physical host network interface by selecting and dragging the logical network into the Assigned Logical Networks area next to the physical host network interface.
   Alternatively, right-click the logical network and select a network interface from the drop-down menu.
5. Configure the logical network:
   1. Hover your cursor over an assigned logical network and click the pencil icon to open the Edit Management Network window.
   2. Select a Boot Protocol from None, DHCP, or Static. If you selected Static, enter the IP, Netmask / Routing Prefix, and the Gateway.

      Note

      Each logical network can have a separate gateway defined from the management network gateway. This ensures traffic that arrives on the logical network will be forwarded using the logical network's gateway instead of the default gateway used by the management network.
   3. To override the default host network quality of service, select Override QoS and enter the desired values in the following fields:
      • Weighted Share: Signifies how much of the logical link's capacity a specific network should be allocated, relative to the other networks attached to the same logical link. The exact share depends on the sum of shares of all networks on that link. By default this is a number in the range 1-100.
      • Rate Limit [Mbps]: The maximum bandwidth to be used by a network.
      • Committed Rate [Mbps]: The minimum bandwidth required by a network. The Committed Rate requested is not guaranteed and will vary depending on the network infrastructure and the Committed Rate requested by other networks on the same logical link.
      For more information on configuring host network quality of service see Section 2.3, “Host Network Quality of Service”
   4. To configure a network bridge, click the Custom Properties drop-down menu and select bridge_opts. Enter a valid key and value with the following syntax: [key]=[value]. Separate multiple entries with a whitespace character. The following keys are valid, with the values provided as examples. For more information on these parameters, see Section B.1, “Explanation of bridge_opts Parameters”.

      forward_delay=1500 
      gc_timer=3765 
      group_addr=1:80:c2:0:0:0 
      group_fwd_mask=0x0 
      hash_elasticity=4 
      hash_max=512
      hello_time=200 
      hello_timer=70 
      max_age=2000 
      multicast_last_member_count=2 
      multicast_last_member_interval=100 
      multicast_membership_interval=26000 
      multicast_querier=0 
      multicast_querier_interval=25500 
      multicast_query_interval=13000 
      multicast_query_response_interval=1000 
      multicast_query_use_ifaddr=0 
      multicast_router=1 
      multicast_snooping=1 
      multicast_startup_query_count=2 
      multicast_startup_query_interval=3125

   5. To configure ethtool properties, click the Custom Properties drop-down menu and select ethtool_opts. Enter a valid key and value with the following syntax: [key]=[value]. Separate multiple entries with a whitespace character. The ethtool_opts option is not available by default, and you need to add it using the engine configuration tool. See Section B.2, “How to Set Up Red Hat Enterprise Virtualization Manager to Use Ethtool” for more information. See Red Hat Enterprise Linux 6 Deployment Guide or the manual page for more information on ethtool properties.
   6. To configure Fibre Channel over Ethernet (FCoE), click the Custom Properties drop-down menu and select fcoe. Enter a valid key and value with the following syntax: [key]=[value]. At least enable=yes is required. You can also add dcb=[yes|no] and auto_vlan=[yes|no]. Separate multiple entries with a whitespace character. The fcoe option is not available by default; you need to add it using the engine configuration tool. See Section B.3, “How to Set Up Red Hat Enterprise Virtualization Manager to Use FCoE” for more information.

      Note

      A separate, dedicated logical network is recommended for use with FCoE.
   7. If your logical network definition is not synchronized with the network configuration on the host, select the Sync network check box. A logical network cannot be edited or moved to another interface until it is synchronized.

      Note

      Networks are not considered synchronized if they have one of the following conditions:

      • The VM Network is different from the physical host network.
      • The VLAN identifier is different from the physical host network.
      • A Custom MTU is set on the logical network, and is different from the physical host network.
6. Select the Verify connectivity between Host and Engine check box to check network connectivity; this action will only work if the host is in maintenance mode.
7. Select the Save network configuration check box to make the changes persistent when the environment is rebooted.
8. Click OK.

Procedure 5.21. Adding Multiple VLANs to a Network Interface using Logical Networks

1. Click the Hosts resource tab, and select in the results list a host associated with the cluster to which your VLAN-tagged logical networks are assigned.
2. Click the Network Interfaces tab in the details pane to list the physical network interfaces attached to the data center.
3. Click Setup Host Networks to open the Setup Host Networks window.
4. Drag your VLAN-tagged logical networks into the Assigned Logical Networks area next to the physical network interface. The physical network interface can have multiple logical networks assigned due to the VLAN tagging.
5. Edit the logical networks by hovering your cursor over an assigned logical network and clicking the pencil icon to open the Edit Network window.
   If your logical network definition is not synchronized with the network configuration on the host, select the Sync network check box.
   Select a Boot Protocol from:

   • None,
   • DHCP, or
   • Static,
     Provide the IP and Subnet Mask.

   Click OK.
6. Select the Verify connectivity between Host and Engine check box to run a network check; this will only work if the host is in maintenance mode.
7. Select the Save network configuration check box
8. Click OK.

Procedure 5.22. Adding Network Labels to Host Network Interfaces

1. Click the Hosts resource tab, and select in the results list a host associated with the cluster to which your VLAN-tagged logical networks are assigned.
2. Click the Network Interfaces tab in the details pane to list the physical network interfaces attached to the data center.
3. Click Setup Host Networks to open the Setup Host Networks window.
4. Click Labels, and right-click [New Label]. Select a physical network interface to label.
   
5. Enter a name for the network label in the Label text field.
6. Click OK.

Procedure 5.24. Updating the FQDN of a Hypervisor Host

1. Place the hypervisor into maintenance mode so the virtual machines are live migrated to another hypervisor. See Section 6.5.7, “Moving a Host to Maintenance Mode” for more information. Alternatively, manually shut down or migrate all the virtual machines to another hypervisor. See Manually Migrating Virtual Machines in the Virtual Machine Management Guide for more information.
2. Click Remove, and click OK to remove the host from the Administration Portal.
3. • For RHEL-based hosts:
     • For Red Hat Enterprise Linux 6:
       Edit the /etc/sysconfig/network file, update the host name, and save.

       # vi /etc/sysconfig/network
       HOSTNAME=NEW_FQDN

     • For Red Hat Enterprise Linux 7:
       Use the hostnamectl tool to update the host name. For more options, see Configure Host Names in the Red Hat Enterprise Linux 7 Networking Guide.

       # hostnamectl set-hostname NEW_FQDN

   • For Red Hat Enterprise Virtualization Hypervisors (RHEV-H):
     In the text user interface, select the Network screen, press the right arrow key and enter a new host name in the Hostname field. Select <Save> and press Enter.
4. Reboot the host.
5. Re-register the host with the Manager. See Manually Adding a Hypervisor from the Administration Portal in the Installation Guide for more information.

Procedure 5.25. 

1. Place the Hypervisor into maintenance mode so the virtual machines are live migrated to another hypervisor. See Section 6.5.7, “Moving a Host to Maintenance Mode” for more information. Alternatively, manually shut down or migrate all the virtual machines to another hypervisor. See Manually Migrating Virtual Machines in the Virtual Machine Management Guide for more information.
2. Click Remove, and click OK to remove the host from the Administration Portal.
3. Log in to your Hypervisor as the admin user.
4. Press F2, select OK, and press Enter to enter the rescue shell.
5. Modify the IP address by editing the /etc/sysconfig/network-scripts/ifcfg-ovirtmgmt file. For example:

   # vi /etc/sysconfig/network-scripts/ifcfg-ovirtmgmt
   ...
   BOOTPROTO=none	
   IPADDR=10.x.x.x
   PREFIX=24
   ...

6. Restart the network service and verify that the IP address has been updated.
   • For Red Hat Enterprise Linux 6:

     # service network restart

     # ifconfig ovirtmgmt

   • For Red Hat Enterprise Linux 7:

     # systemctl restart network.service

     # ip addr show ovirtmgmt

7. Type exit to exit the rescue shell and return to the text user interface.
8. Re-register the host with the Manager. See Manually Adding a Hypervisor from the Administration Portal in the Installation Guide for more information.