Question

How to change Controller VM and Host IP address?

  • 9 October 2020
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Please consider the possibility of incorporating the existing IP scheme in the new infrastructure. If changing the IP address is the only option we can utilize a script to change the CVM IP address.

 

You can use the external IP address reconfiguration script in the following scenarios:

  • Change the IP addresses of the CVMs in the same subnet.

  • Change the IP addresses of the CVMs to a new or different subnet.
    In this scenario, the external IP address reconfiguration script works successfully if the new subnet is configured with the required switches and the CVMs can communicate with each other in the new subnet.

  • Change the IP addresses of the CVMs to a new or different subnet if you are moving the cluster to a new physical location.
    In this scenario, the external IP address reconfiguration script works successfully if the CVMs can still communicate with each other in the old subnet.


 

Following is the summary of steps that you must perform to change the IP addresses on a Nutanix cluster.

 

  1. Check the health of the cluster infrastructure and resiliency (For more information, see the Before you begin section of this document.)

  2. Stop the cluster.

  3. Change the VLAN and NIC Teaming configurations as necessary.

Note: Check the connectivity between CVMs and hosts, that is all the hosts must be reachable from all the CVMs and vice versa before you perform step 4. If any CVM or host is not reachable, contact Nutanix Support for assistance.

  1. Change the CVM IP addresses by using the external_ip_reconfig script.

  2. Change the hypervisor host IP addresses if necessary.

  3. Restart the CVMs.

  4. Perform the initial series of validation steps.

  5. Start the cluster.

  6. Perform the final series of validation steps.

  7. Change the IPMI IP addresses if necessary.

 

Note: Please be sure to follow the steps in the order given

 

The external IP address reconfiguration script performs the following tasks:

 

  1. Checks if the cluster is stopped.

  2. Puts the cluster in reconfiguration mode.

  3. Restarts Genesis.

  4. Prompts you to type the new netmask, gateway, and external IP addresses, and updates them.

  5. Updates the IP addresses of the Zookeeper hosts.


 

For detailed information on each step for automated method. Please refer to the following portal document:

 

https://portal.nutanix.com/page/documents/details?targetId=Advanced-Setup-Guide-AOS-v5_18:ipc-cvm-ip-address-reconfigure-t.html

 

The host IPs can be changed directly from the DCUI if the hypervisor is ESXi and if the hypervisor is AHV please follow the process mentioned in the following document:

 

https://portal.nutanix.com/page/documents/details?targetId=AHV-Admin-Guide-v5_18:ahv-acr-host-ip-address-change-t.html

 


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