If you leave the default passwords on your Nutanix cluster you’ll start to see alerts in Prism that the default password is still in use. It will alert you about it for both the CVM and the physical hosts. This alert is very easy to clear by just updating the password. Here’s how…

To run just the default password health check from your CVM you can use the following command:

nutanix@cvm$ ncc health_checks system_checks default_password_check

Or you can also run the complete set of NCC health checks:

nutanix@cvm$ ncc health_checks run_all

If the health check passes, you’ll see this line in the output:

/health_checks/system_checks/default_password_check              [ PASS ]

If the health check fails you’ll see this in the output and it will tell you which host(s) alerted:

/health_checks/system_checks/default_password_check              [ INFO ]
------------------------------------------------------------------------+
Detailed information for default_password_check:
Node x.x.x.x:

Nutanix Controller VM (CVM) password change

Running this command will prompt you for your new desired password for the ‘nutanix’ user on the CVM:
nutanix@cvm$ sudo passwd nutanix

Once you change the CVM’s password it will replicate to all of the CVMs in your cluster, thus changing the password on all of your CVMs at once.

Hypervisor password change

• AHV
  To change the local “admin” account password for all AHV hypervisors in the Nutanix cluster, you can run this command from any CVM in the cluster.
  nutanix@cvm$ echo -e "CHANGING ALL AHV HOST ADMIN PASSWORDS. Note - This script cannot be used for passwords that contain special characters ( $ \ { } ^ &)\nPlease input new password: "; read -s password1; echo "Confirm new password: "; read -s password2; if [ "$password1" == "$password2" ] && [[ ! "$password1" =~ [\{\$\^}\&] ]]; then hostssh "echo -e \"admin:${password1}\" | chpasswd"; else echo "The passwords do not match or contain invalid characters (\ $ { } ^ &)"; fi
  To change the local “nutanix” account password for all AHV hypervisors in the Nutanix cluster, you can run this command from any CVM in the cluster.
  nutanix@cvm$ echo -e "CHANGING ALL AHV HOST NUTANIX PASSWORDS. Note - This script cannot be used for passwords that contain special characters ( $ \ { } ^ &)\nPlease input new password: "; read -s password1; echo "Confirm new password: "; read -s password2; if [ "$password1" == "$password2" ] && [[ ! "$password1" =~ [\{\$\^}\&] ]]; then hostssh "echo -e \"nutanix:${password1}\" | chpasswd"; else echo "The passwords do not match or contain invalid characters (\ $ { } ^ &)"; fi
  
  
• VMware ESXi 
  To change the local root password for all ESXi hosts in the cluster, you can run this command from any CVM in the cluster.
  nutanix@cvm$ echo -e "CHANGING ALL ESXi HOST PASSWORDS. Note - This script cannot be used for passwords that contain special characters ( $ \ { }  ^ &)\nPlease input new password: "; read -s password1; echo "Confirm new password: "; read -s password2; if [ "$password1" == "$password2" ] && [[ ! "$password1" =~ [\\\{\$\^\}\&] ]]; then hostssh "echo -e \"${password1}\" | passwd root --stdin"; else echo "The passwords do not match or contain invalid characters (\ $ { } ^ &)"; fi
  
  
• Microsoft Hyper-V 
  To change the local administrator password for all Hyper-V hosts in the cluster, you can run this command from any CVM in the cluster.
  nutanix@cvm$ echo -e "CHANGING ALL HYPER-V HOST PASSWORDS. Note - This script cannot be used for passwords that contain special characters ( $ \ { }  ^)\nPlease input new password: "; read -s password1; echo "Confirm new password: "; read -s password2; if [ "$password1" == "$password2" ] && [[ ! "$password1" =~ [\ \"\'\\\{\$\^\}] ]]; then hostssh "net user administrator $password1"; echo "Updating Host and ManagementServer Entries..."; ncli host ls | grep -i id | grep -Eo "::[0-9]*" | cut -c 3- | while read hID; do ncli host edit id=$hID hypervisor-password=$password1;done  > /dev/null; ncli host ls | grep "Hypervisor Address" | awk '{print $4}' | while read hIP; do ncli managementserver edit name=$hIP password=$password1;done > /dev/null;  else echo "The passwords do not match or contain invalid characters (\ $ { } ^)"; fi

Further info can be found in the following Nutanix KB.