Default Container Options

It is possible to configure default container options under the controllers.*.defaultContainerOptions key. These options will be applied to all containers within the controller.

The following fields can be configured on this level:

• args
• command
• env
• envFrom
• image
• resources
• securityContext

Only applying to regular containers

By default the defaultContainerOptions will be applied to both initContainers and regular containers. If you wish to only apply the default options to regular containers, set controllers.*.applyDefaultContainerOptionsToInitContainers to false.

Default value strategies

Overwrite

The default strategy for configuring default container options is overwrite. This means that if a container has an entry for a default container option it will be overwritten entirely by the container-specific configuration.

This behavior can be set explicitly by setting controllers.*.defaultContainerOptionsStrategy to overwrite.

An (abbreviated) example of the overwrite strategy:

controllers:
  main:
    defaultContainerOptions:
      resources:
        requests:
          memory: 1Gi
          cpu: 150m

    containers:
      main:
        ...
        resources:
          requests:
            cpu: 100m

The expected resources field on the main container is expected to look like this:

resources:
  requests:
    cpu: 100m

Merge

An alternative strategy for configuring default container options is merge. This means that if a container has an entry for a default container option it will be merged with the container-specific configuration.

This behavior can be set explicitly by setting defaultContainerOptionsStrategy to merge.

An (abbreviated) example of the merge strategy:

controllers:
  main:
    defaultContainerOptionsStrategy: merge
    defaultContainerOptions:
      resources:
        requests:
          memory: 1Gi
          cpu: 150m

    containers:
      main:
        ...
        resources:
          requests:
            cpu: 100m

The expected resources field on the main container is expected to look like this:

resources:
  requests:
    memory: 1Gi
    cpu: 100m