Before upgrading to vCenter Server 7.0, you must prepare your ESXi hosts.
To upgrade vCenter Server appliance, your ESXi hosts must meet the requirements for upgrade.
- ESXi hosts must be at version 6.5 or later. For information on ESXi compatibility, see the VMware Compatibility Guide.
- Your source and target ESXi hosts must not be in lockdown or maintenance mode, and not part of fully automated DRS clusters.
- Review your environment's Certificate Authority (CA) signed SSL certificates. To learn about manually reviewing CA signed SSL certificates in a vSphere environment, see Knowledge Base article KB 2111411.
- If you have Custom or Thumbprint certificates, see Host Upgrades and Certificates to determine your preparatory steps.
- If you have vSphere HA clusters, SSL certificate checking must be enabled.
If certificate checking is not enabled when you upgrade ESXi hosts, vSphere HA fails to configure on the hosts.
- Select the vCenter Server appliance instance in the vSphere Client inventory tree.
- Select the Configure tab, and then under Settings select General.
- Click Edit.
- Select SSL settings.
Verify that vCenter Server requires verified host SSL certificates is selected.
Your ESXi hosts are ready for the vCenter Server appliance upgrade.