https://digitalthoughtdisruption.com/2020/09/21/how-to-install-deploy-vcenter-server-appliance-vcsa-7-0-c/

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A list of Required Ports for vCenter Server can be found

Pre-Requisites:

• If you want to deploy the appliance on an ESXi host, verify that the ESXi host is not in lockdown or maintenance mode and not part of a fully automated DRS cluster.
• If you want to deploy the appliance on a DRS cluster of the inventory of a vCenter Server instance, verify that the cluster contains at least one ESXi host that is not in lockdown or maintenance mode.
• If you plan to use NTP servers for time synchronization, verify that the NTP servers are running and that the time between the NTP servers and the target server on which you want to deploy the appliance is synchronized.
• To deploy vCenter Server 7.0 appliance you need an ESXi host 6.5 or later, or on a vCenter Server instance 6.5 or later.
• Put the FQDN for the new vCenter into DNS and make sure the workstation you are deploying the vCenter from can reach the DNS server

vCenter Enhanced Linked Mode Pre-Requisites

When deploying a new vCenter Server as part of an Enhanced Linked Mode deployment, create an image-based backup of the existing vCenter Server nodes in your environment. You can use the backup as a precaution in case there is a failure during the deployment process. If the deployment fails, delete the newly deployed vCenter Server appliance, and restore the vCenter Server nodes from their respective image-based backups. You must restore all the nodes in the

environment from their image-based backups. Failing to do so can cause the replication partners to be out of synchronization with the restored node.

The vCenter Server appliance package contains the following software:

• Photon OS 3.0
• The vSphere authentication services
• PostgreSQL
• VMware vSphere Lifecycle Manager Extension
• VMware vCenter Lifecycle Manager