If you are maintaining a VMware environment, I believe this is not a new thing and you may already using VMware Update Manager aka VUM for your Host upgrades and Patch management. You need to have a separate server for this and with vSphere 6.5 you are getting this as an inbuilt feature with your vSphere vCenter Appliance. If you are interested in reading more about this you can read VMware blog article here.
You need to specify your vCenter server at the next step along with the port, username and password for the update manager authentication.
You need to specify a Database for your update manager if you already have one or you can deploy a SQL server at this stage if you required, it will install the SQL server in the same server, this Database is recommended for a small scale and you need to specify a separate Database if you have a bigger environment.
Specify the SOAP, Web and SSL ports at the next step, recommended to leave the default ports. Also, installation will confirm the Update Manager IP address
Next step, you can specify the Update Manager Installation directory and the Patches directory
Now you are all set for the installation and start the installation by clicking the “Install” button in the wizard
It will begin the installation
It will install the SQL server as well
Click on “Finish” after the installation.
So now you are done with the installation and now you need to download and install the plugin in to your vCenter server. Login to your vCenter server and go to your Plug-in Manager. You will the Update Manager plug-in available to download and install in to your vCenter. Click on “Download and Install”.
Click on “Run” to authorize the installation
Now complete the installation of your Update Manager Client Plugin.