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Placement Groups

You can add a cloud server to a placement group. Servers in a group can be located on different physical hosts, which increases infrastructure fault tolerance.

A placement group is created for a specific pool. Note that cloud servers in a group can be located in different segments within the pool.

You can work with placement groups in the control panel, using OpenStack CLI or Terraform.

Placement policy

When creating a group, you can select a group policy — it determines how servers will be placed on physical hardware:

  • preferably on different hosts (soft-anti-affinity) — the system will strive to place servers on different hosts. If there is no suitable host available when creating a server, it will be created on the same host;
  • strictly on different hosts (anti-affinity) — servers in a group are always located on different hosts. If we do not find a suitable host, the server will not be created.

Restrictions

A group can only be created for a single pool.

In one project, you can create no more than 100 placement groups.

A single group can contain no more than 15 cloud servers at a time.

You can add a cloud server to a placement group only when creating a cloud server.

Pricing

Creating a placement group is free of charge.

Only cloud servers included in the group and other cloud platform resources are charged according to the cloud platform payment model.