When you boot a host that you want to provision or reprovision with vSphere Auto Deploy, the vSphere Auto Deploy infrastructure supplies the image profile and, optionally, a host profile, a vCenter Server location, and script bundle for that host.
The boot process is different for hosts that have not yet been provisioned with vSphere Auto Deploy (first boot) and for hosts that have been provisioned with vSphere Auto Deploy and added to a vCenter Server system (subsequent boot).
First Boot Prerequisites
Before a first boot process, you must set up your system. Setup includes the following tasks, which are discussed in more detail in Preparing for vSphere Auto Deploy.
Set up a DHCP server that assigns an IP address to each host upon startup and that points the host to the TFTP server to download the iPXE boot loader from.
If the hosts that you plan to provision with vSphere Auto Deploy are with legacy BIOS, verify that the vSphere Auto Deploy server has an IPv4 address. PXE booting with legacy BIOS firmware is possible only over IPv4. PXE booting with UEFI firmware is possible with either IPv4 or IPv6.
Identify an image profile to be used in one of the following ways.
Choose an ESXi image profile in a public depot.
Create a custom image profile by using vSphere ESXi Image Builder, and place the image profile in a depot that the vSphere Auto Deploy server can access. The image profile must include a base ESXi VIB.
If you have a reference host in your environment, export the host profile of the reference host and define a rule that applies the host profile to one or more hosts. See Setting Up a vSphere Auto Deploy Reference Host.
Specify rules for the deployment of the host and add the rules to the active rule set.
First Boot Overview
When a host that has not yet been provisioned with vSphere Auto Deploy boots (first boot), the host interacts with several vSphere Auto Deploy components.
When the administrator turns on a host, the host starts a PXE boot sequence.
The DHCP Server assigns an IP address to the host and instructs the host to contact the TFTP server.
The host contacts the TFTP server and downloads the iPXE file (executable boot loader) and an iPXE configuration file.
iPXE starts executing.
The configuration file instructs the host to make a HTTP boot request to the vSphere Auto Deploy server. The HTTP request includes hardware and network information.
In response, the vSphere Auto Deploy server performs these tasks:
Queries the rules engine for information about the host.
Streams the components specified in the image profile, the optional host profile, and optional vCenter Server location information.
The host boots using the image profile.
If the vSphere Auto Deploy server provided a host profile, the host profile is applied to the host.
vSphere Auto Deploy adds the host to thevCenter Server system that vSphere Auto Deploy is registered with.
If a rule specifies a target folder or cluster on the vCenter Server system, the host is placed in that folder or cluster. The target folder must be under a data center.
If no rule exists that specifies a vCenter Server inventory location, vSphere Auto Deploy adds the host to the first datacenter displayed in the vSphere Web Client UI.
If the host profile requires the user to specify certain information, such as a static IP address, the host is placed in maintenance mode when the host is added to the vCenter Server system.
You must reapply the host profile and update the host customization to have the host exit maintenance mode. When you update the host customization, answer any questions when prompted.
If the host is part of a DRS cluster, virtual machines from other hosts might be migrated to the host after the host has successfully been added to the vCenter Server system.
Subsequent Boots Without Updates
For hosts that are provisioned with vSphere Auto Deploy and managed by avCenter Server system, subsequent boots can become completely automatic.
The administrator reboots the host.
As the host boots up, vSphere Auto Deploy provisions the host with its image profile and host profile.
Virtual machines are brought up or migrated to the host based on the settings of the host.
Standalone host. Virtual machines are powered on according to autostart rules defined on the host.
DRS cluster host. Virtual machines that were successfully migrated to other hosts stay there. Virtual machines for which no host had enough resources are registered to the rebooted host.
If the vCenter Server system is unavailable, the host contacts the vSphere Auto Deploy server and is provisioned with an image profile. The host continues to contact the vSphere Auto Deploy server until vSphere Auto Deploy reconnects to the vCenter Server system.
vSphere Auto Deploy cannot set up vSphere distributed switches if vCenter Server is unavailable, and virtual machines are assigned to hosts only if they participate in an HA cluster. Until the host is reconnected to vCenter Server and the host profile is applied, the switch cannot be created. Because the host is in maintenance mode, virtual machines cannot start. See Reprovision Hosts with Simple Reboot Operations.
Any hosts that are set up to require user input are placed in maintenance mode. See Update the Host Customization in the vSphere Web Client.
Subsequent Boots With Updates
You can change the image profile, host profile, vCenter Server location, or script bundle for hosts. The process includes changing rules and testing and repairing the host's rule compliance.
The administrator uses the Copy-DeployRule PowerCLI cmdlet to copy and edit one or more rules and updates the rule set. See Overview of the vSphere Auto Deploy Process by Using PowerCLI for an example.
The administrator runs the Test-DeployRulesetCompliance cmdlet to check whether each host is using the information that the current rule set specifies.
The host returns a PowerCLI object that encapsulates compliance information.
The administrator runs the Repair-DeployRulesetCompliance cmdlet to update the image profile, host profile, or vCenter Server location the vCenter Server system stores for each host.
When the host reboots, it uses the updated image profile, host profile, vCenter Server location, or script bundle for the host.
If the host profile is set up to request user input, the host is placed in maintenance mode. Follow the steps in Update the Host Customization in the vSphere Web Client.
Provisioning of Systems that Have Distributed Switches
You can configure the host profile of a vSphere Auto Deploy reference host with a distributed switch.
When you configure the distributed switch, the boot configuration parameters policy is automatically set to match the network parameters required for host connectivity after a reboot.
When vSphere Auto Deploy provisions the ESXi host with the host profile, the host goes through a two-step process.
The host creates a standard virtual switch with the properties specified in the boot configuration parameters field.
The host creates the VMkernel NICs. The VMkernel NICs allow the host to connect to vSphere Auto Deploy and to the vCenter Server system.
When the host is added to vCenter Server, vCenter Server removes the standard switch and reapplies the distributed switch to the host.
Do not change the boot configuration parameters to avoid problems with your distributed switch.