Components collocation

MOS uses Kubernetes labels to place components onto hosts. For the default locations of components, see MOS cluster hardware requirements. Additionally, MOS supports component collocation. This is mostly useful for OpenStack compute and Ceph nodes. For component collocation, consider the following recommendations:

  • When calculating hardware requirements for nodes, consider the requirements for all collocated components.

  • When performing maintenance on a node with collocated components, execute the maintenance plan for all of them.

  • When combining other services with the OpenStack compute host, verify that reserved_host_* has increased accordingly to the needs of collocated components by using node-specific overrides for the compute service.