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Administrators Who Do Not Replace VMware Certificates
VMCA can handle all certificate management. VMCA provisions vCenter Server components and ESXi
hosts with certificates that use VMCA as the root certificate authority. If you are upgrading to vSphere 6
from an earlier version of vSphere, all self-signed certificates are replaced with certificates that are signed
by VMCA.
If you do not currently replace VMware certificates, your environment starts using VMCA-signed
certificates instead of self-signed certificates.
Administrators Who Replace VMware Certificates with Custom
Certificates
If your company policy requires certificates that are signed by a third-party or enterprise CA, or that
require custom certificate information, you have several choices for a fresh installation.
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Have the VMCA root certificate signed by a third-party CA or enterprise CA. Replace the VMCA root
certificate with that signed certificate. In this scenario, the VMCA certificate is an intermediate
certificate. VMCA provisions vCenter Server components and ESXi hosts with certificates that include
the full certificate chain.
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If your company policy does not allow intermediate certificates in the chain, you can replace
certificates explicitly. You can use the vSphere Client, vSphere Certificate Manager utility, or perform
manual certificate replacement using the certificate management CLIs.
When upgrading an environment that uses custom certificates, you can retain some of the certificates.
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ESXi hosts keep their custom certificates during upgrade. Make sure that the vCenter Server upgrade
process adds all the relevant root certificates to the TRUSTED_ROOTS store in VECS on the
vCenter Server.
After the upgrade to vSphere 6.0 or later, you can set the certificate mode to Custom. If the certificate
mode is VMCA, the default, and the user performs a certificate refresh from the vSphere Web Client,
the VMCA-signed certificates replace the custom certificates.
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For vCenter Server components, what happens depends on the existing environment.
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For an upgrade of a simple installation to an embedded deployment, vCenter Server retains
custom certificates. After the upgrade, your environment works as before.
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For an upgrade of a multi-site deployment, vCenter Single Sign-On can be on a different machine
than other vCenter Server components. In that case, the upgrade process creates a multi-node
deployment that includes a Platform Services Controller node and one or more management
nodes.
This scenario retains the existing vCenter Server and vCenter Single Sign-On certificates. The
certificates are used as machine SSL certificates.
In addition, VMCA assigns a VMCA-signed certificate to each solution user (collection of vCenter
services). The solution user uses this certificate only to authenticate to vCenter Single Sign-On.
Replacing solution user certificates is often not required by a company policy.
Platform Services Controller Administration
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