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n Two VIBs with the same name, but two different versions, cannot coexist. When you add a
new version of a VIB, the new version replaces the existing version of the VIB.
n No acceptance level validation issues exist.
When you make a change to an image profile, vSphere ESXi Image Builder checks that the change
does not invalidate the profile.
Dependency Validation
When you add or remove a VIB, vSphere ESXi Image Builder checks that package
dependencies are met. Each SoftwarePackage object includes a Depends property that
specifies a list of other VIBs that VIB depends on. See Structure of ImageProfile,
SoftwarePackage, and ImageProfileDiff Objects
Acceptance Level Validation
vSphere ESXi Image Builder performs acceptance level validation each time an image profile
is created or changed. vSphere ESXi Image Builder checks the acceptance level of VIBs in the
image profile against the minimum allowed acceptance level of the profile. The acceptance
level of the VIB is also validated each time the signature of a VIB is validated.
VIB Validation During Export
When you export an image profile to an ISO, vSphere ESXi Image Builder validates each VIB by
performing the following actions.
n Checks that no conflicts exist by checking the Conflicts property of each SoftwarePackage
object.
n Performs VIB signature validation. Signature validation prevents unauthorized modification of
VIB packages. The signature is a cryptographic checksum that guarantees that a VIB was
produced by its author. Signature validation also happens during installation of VIBs on an
ESXi host and when the vSphere Auto Deploy server uses VIBs.
n Checks that VIBs follow file path usage rules. VMware tests VMwareCertified and
VMwareAccepted VIBs to guarantee those VIBs always follow file path usage rules.
Acceptance Levels
Each VIB is released with an acceptance level that cannot be changed. The host acceptance level
determines which VIBs can be installed to a host. You can change the host acceptance levels with
esxcli commands.
VMware supports the following acceptance levels.
VMwareCertified
The VMwareCertified acceptance level has the most stringent requirements. VIBs with this
level go through thorough testing fully equivalent to VMware in-house Quality Assurance
VMware ESXi Installation and Setup
VMware, Inc. 35