Setting Up VIPs for NFSv3

You can set up VIPs using the MapR Control System or the CLI.

Note: The NFSv3 server (mapr-nfsserver) nodes cannot failover to NFSv4 server (mapr-nfs4server) nodes and vice versa. Ensure that different set of VIPs are assigned for NFSv3 and NFSv4 server nodes. When running the maprcli virtualip add command to set up VIPs, list the MACs of the respective nodes so that the failover works properly (this is necessary if both NFSv3 and NFSv4 are going to be set up on the same cluster). The MACs should be mutually exclusive as both NFSv3 and NFSv4 servers cannot run on the same node.

Adding VIPs Using the MapR Control System

You can use the MCS to specify a range of virtual IP addresses and assign them to the pool of servers that are running the NFS service. You can also restrict the assignment of virtual IP addresses to certain subnets.

Before following this procedure, make sure:

  • You have installed NFS on at least three nodes (recommended).
  • You have started the NFS gateway service on the servers to which you plan to assign VIPs.
  1. Log in to MCS, click Services, and go to the NFS service information page where you can configure VIPs for NFSv3 nodes.
  2. Click Add Virtual IP to display the Add Virtual IP page.
  3. Enter the start of the VIP range in the Starting Virtual IP field.
    MapR distributes the VIPs in this range to the selected network interfaces. VIPs are automatically migrated between the network interfaces when failures occur.
  4. Enter the end of the VIP range in the Ending Virtual IP field.
    If you are assigning only one VIP, you can leave the field blank. MapR distributes the VIPs in this range to the selected network interfaces. VIPs are automatically migrated between the network interfaces when failures occur.
  5. Enter the Netmask for the VIP range in the Netmask field.
    For example: 255.255.255.0MapR assigns this netmask to the network interfaces along with the VIPs.
  6. Specify whether (Yes) or not (No) to assign a particular VIP address to a specific server or MAC address. If Yes, enter the MAC address for the network interface to be assigned to the listed VIP address. The remaining VIP addresses from the same pool are assigned randomly.
  7. Select one of the following:
    • Use all network interfaces on all nodes that are running the NFS Gateway service to set up VIPs that use all network interfaces on all the nodes running the NFS Gateway service.

      If additional NFS Gateway services are started, the network interfaces on their nodes will automatically become candidates for the VIPs in this range.

    • Select network interfaces to restrict the assignment of virtual IP addresses to certain subnets:
      A list of available and selected node names, physical IP addresses, and MAC addresses displays. Select from the:
      • Available list and click to move selection to Selected VIPs.
      • Selected list and click to remove from selected list of VIPs.
      See Designating NICs for MapR.
  8. Confirm the actual VIP assignment by clicking Save Changes.
    It might take up to 40 seconds to assign the VIPs. If necessary, refresh the page in your browser to view the list of VIPs.

Adding VIPs Using the CLI and REST API

The basic command to set up VIPs is:
maprcli virtualip add -netmask <netmask> -virtualip <virtualip> -service nfs3 -json
Send a request of type POST. For example:
curl -k -X POST 'https://<host>:8443/rest/virtualip/add?service=nfs3&netmask=<netmask>&virtualip=<vip>' --user mapr:mapr

For the complete list of required and optional parameters, see virtualip add.