Resource dependencies

depends_on can be used to define resources with one or more dependencies.

Specify the resource ID for the value.

Example definition of a single dependency:

resources:
  server1:
    type: OS::Nova::Server
    depends_on: server2

  server2:
    type: OS::Nova::Server

Example definition of multiple dependencies:

resources:
  server1:
    type: OS::Nova::Server
    depends_on: [ server2, server3 ]

  server2:
    type: OS::Nova::Server

  server3:
    type: OS::Nova::Server

Note:

When depends_on is specified, creation of the dependent resource will wait for the specified resource to be created first.
In "Example definition of multiple dependencies", creation of server1 will start after server2 and server3 have been created.