vCloud Director 10 : VM Placement Policies

vCloud Director 10 has introduced a new concept called VM placement policies which helps Cloud Provider to control the virtual machine (VM) placement on a specific cluster or host.VM placement policies give cloud providers various options to allocate resources to various use cases like:

  1. Deploy VM’s to specific cluster based on performance requirement
  2. Deploy VM’s to Specific cluster based on resource requirements
  3. Deploy VM’s based on Licensing requirement as a part of Oracle/SQL licenses optimisation
  4. Allocate specific hosts to specific Tenants
  5. Deploy container/special use case specific VMs to a specific host/cluster
  6. Restrict elastic VDC pools to deploy VMs to a specific cluster

vCD Provider administrator create and manage VM placement policies and placement policies are created and managed for each provider VDC, because a VM placement policy is scoped at the provider VDC level.

Create a VM Placement Policy

Before we create VM Placement policies, provider need to perform few steps on vCenter , so lets go and login to vCenter which is providing resource to vCloud Director and go to Cluster -> Configure -> VM/Host Groups

1.png

In this case i want to limit deployment of Oracle and MS SQL VM’s to specific hosts due to licensing, so let’s create Hosts groups and VM Groups:

Host Groups: 

To create Host Groups , Click on Add inside VM/Host Groups:

  1. Enter  Host Group Name
  2. Select Type as “Host Group”
  3. Click on Add to add Host/Hosts of the cluster.

2

VM Groups

To create VM Groups , Click on Add inside VM/Host Groups

  1. Enter  VM Group Name
  2. Select Type as “VM Group”
  3. Click on Add to add VM/VMs of the cluster. (select any dummy VM as of now)

3

once both the groups has been created go to VM/Host rules in the cluster and create a rule.

4.png

VM/Host Rules

To create VM/Host Rules, Click on Add inside VM/Host Rules

  1. Enter  Rule Name
  2. Ensure “Enable rule”
  3. Select rule type as “Virtual Machine to Hosts”
  4. VM Group: Select VM Group that we have created above
  5. Here you have four choices: (In my case i have choose Must rule)
    • Must run on host in group
    • Should run on host in group
    • Must not run on host in group
    • Should not run on host in group
  6. Host Group: Select Host Group that we have created above

5.png

From vCenter prospective we are done, we have multiple choice to create VM to Hosts affinity/anti-affinity rules , once we have created rules , vCloud director picks up only “VM Groups” which provider will expose to tenants.

Create VM Placement Policies in vCloud Director

  1. Go to Provider VDCs.
  2. Click on a provider VDC from the list , in my case it was “nsxtpvdc”
  3. Click on “VM Placement Policies”
  4. Click the VM Placement Policies tab and click New.

6

New Policy Creation Wizard

  1. First Page , click on Next
    1. 7
  2. Enter a name for the VM placement policy and description and click Next
    1. 8.png
  3. Select the VM groups or logical VM groups to which you want the VM to be linked and click Next.
    1. 9.png

  4. Review the VM placement policy settings and click Finish.
    1. 10.png

Publish VM Placement Policies to Org VDC

When provider creates a VM placement policy, it is not visible to tenants. Provider need to publish a VM placement policy to an org VDC to make it available to tenants and publishing a VM placement policy to an org VDC makes the policy visible to tenants. The tenant can select the policy when they:

  • Create a new standalone VM
  • Create a VM from a template,
  • edit a VM
  • add a VM to a vApp
  • Create a vApp from a vApp template. 

To publish this newly created policy to tenants , go to:

  1. Organization VDCs and Select an organization VDC
    1. 11.png
  2. Click the VM Placement Policies tab and Click Add.
    1. 12.png
  3. Select the VM placement policies that you want to add to the organization VDC and click OK.
    1. 13.png
  4. Provider can make certain policies as “Default” when customer does not choose any policy , system will automatically use “Default”.
    1. 14.png

Policy Usage by Tenant

Once policies has been created and exposed to tenant organisation, tenant can use those policies while provisioning VMs. like here i have created two policies “Oracle” and “SQL” and tenant can choose based on workload requirement.

15.png

NOTE –  Placement Policies are optional and a provider can continue to use the default policy that is created during installation and only one policy can be assigned to a VM.

This completes the creation of placement policies and their exposure to tenants. please feel free to share/comment.

 

 

 

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