sigs.k8s.io/cluster-api@v1.7.1/docs/book/src/developer/crd-relationships.md (about)

     1  # CustomResourceDefinitions relationships
     2  
     3  There are many resources that appear in the Cluster API. In this section, we use diagrams to illustrate the most common relationships between Cluster API resources.
     4  
     5  <aside class="note">
     6  
     7  <h1>Info</h1>
     8  
     9  The straight lines represent "management". For example, "MachineSet manages Machines". The dotted line represents "reference". For example, "Machine's `spec.infrastructureRef` field references FooMachine".
    10  
    11  The direction of the arrows indicates the direction of "management" or "reference". For example, "the relationship between MachineSet and Machine is management from MachineSet to Machine", so the arrow points from MachineSet to Machine.
    12  
    13  </aside>
    14  
    15  ## Control plane machines relationships
    16  
    17  ![]( ../images/kubeadm-control-plane-machines-resources.png)
    18  
    19  ## Worker machines relationships
    20  
    21  ![]( ../images/worker-machines-resources.png)