If you have worked with VxRail as long as I have then you know it is inevitable to relocate a host from one cluster to another to support other projects. Also, it is likely you’ve had a couple hosts laying around in the datacenter awaiting install. I thought I would put together this quick how to configure the VxRail host to be discovered via VxRail Manager and add the host via vCenter.
In case you need to also know how to remove a host from a cluster please see my other blog article:
The How To Process

First log into the iDRAC and Power on System if it isn’t already

Click OK

Launch Virtual Console

Be patient and wait for boot

F2 to configure

Root/Passw0rd!

First go to Configure Mangement Network

IPv4 Configuration

Confirmed Disable IPv4 configuration for management network

Now select VLAN (optional)

Enter the VLAN for your ESXi Management Network

Click <Esc> to Exit

Click <Y> Yes

You should see now the host has a IPv4 IP randomly generated

Scroll down to Troubleshooting Options and enter

Enable ESXi Shell and Enable SSH then Esx to exit

Return to the main screen and Alt-F1 to open a virtual console window to the host

Log in as Root
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Enter the date command to get the current date & time of the host and compare it against the VxRail Manager date & time to confirm they are close in time.
****If not then please see my blog on changing the time on a ESXI host
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[rootßnode-15619:-•] [etc/ init .d/ loudmouth restart
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Double check the Management VLAN that your other VxRail Hosts are located on.
#esxcli network vswitch standard portgroup list
#esxcli network vswitch standard portgroup set -p “Management Network” -v <Your_VLAN_ID>
#esxcli network vswitch standard portgroup set -p “VM Network” -v <Your_VLAN_ID>
#/etc/init.d/loudmouth restart

Finally, log into vCenter and go to Host & Clusters > Cluster > Configure > VxRail > Add VxRail Hosts > ADD HOST
**be patient – can take up to 5 minutes for VxRail Manager to discover the new host

Click Add host

Select the host you want to add.

Now enter your username/password

Next you will need to put the next IP in your original reserved pool for ESXi Management, vMotion, and vSAN.

Next comes entering your different credentials for your environment.

You can choose whether or not to put host in maintenance mode

The good old summary and validate page.
Summary:
As you can see there are a lot of working parts here but it is well worth it. I hope I made this easy to follow. As always, I hope y’all found this helpful.