6.0.2

Table Of Contents
Host Upgrades and Certificates
If you upgrade an ESXi host to ESXi 6.0 or later, the upgrade process replaces self-signed certicates with
VMCA-signed certicates. The process retains custom certicates even if those certicates are expired or
invalid.
The recommended upgrade workow depends on the current certicates.
Host Provisioned with
Thumbprint Certificates
If your host is currently using thumbprint certicates, it is automatically
assigned VMCA certicates as part of the upgrade process.
N You cannot provision legacy hosts with VMCA certicates. You must
upgrade to ESXi 6.0 or later.
Host Provisioned with
Custom Certificates
If your host is provisioned with custom certicates, usually third-party CA-
signed certicates, those certicates remain in place. Change the certicate
mode to Custom to ensure that the certicates are not replaced accidentally.
N If your environment is in VMCA mode, and you refresh the
certicates from the vSphere Web Client, any existing certicates are
replaced with certicates that are signed by VMCA.
Going forward, vCenter Server monitors the certicates and displays
information, for example, about certicate expiration, in the
vSphere Web Client.
If you decide not to upgrade your hosts to vSphere 6.0 or later, the hosts retain the certicates that they are
currently using even if the host is managed by a vCenter Server system that uses VMCA certicates.
Hosts that are being provisioned by Auto Deploy are always assigned new certicates when they are rst
booted with ESXi 6.0 software. When you upgrade a host that is provisioned by Auto Deploy, the Auto
Deploy server generates a certicate signing request (CSR) for the host and submits it to VMCA. VMCA
stores the signed certicate for the host. When the Auto Deploy server provisions the host, it retrieves the
certicate from VMCA and includes it as part of the provisioning process.
You can use Auto Deploy with custom certicates.
Change the Certificate Mode
In most cases, using VMCA to provision the ESXi hosts in your environment is the best solution. If corporate
policy requires that you use custom certicates with a dierent root CA, you can edit the vCenter Server
advanced options so that the hosts are not automatically provisioned with VMCA certicates when you
refresh certicates. You are then responsible for the certicate management in your environment.
You can use the vCenter Server advanced seings to change to thumbprint mode or to custom CA mode.
Use thumbprint mode only as a fallback option.
Procedure
1 Select the vCenter Server that manages the hosts and click .
2 Click Advanced , and click Edit.
3 In the Filter box, enter certmgmt to display only certicate management keys.
4 Change the value of vpxd.certmgmt.mode to custom if you intend to manage your own certicates, and
to thumbprint if you temporarily want to use thumbprint mode, and click OK.
5 Restart the vCenter Server service.
Chapter 3 Before Upgrading vCenter Server
VMware, Inc. 65