Module: Floe::ContainerRunner::DockerMixin

Included in:
Docker, Kubernetes
Defined in:
lib/floe/container_runner/docker_mixin.rb

Constant Summary collapse

MAX_CONTAINER_NAME_SIZE =

63 is the max kubernetes pod name length -5 for the “floe-” prefix -9 for the random hex suffix and leading hyphen

63 - 5 - 9

Instance Method Summary collapse

Instance Method Details

#container_name(image) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/floe/container_runner/docker_mixin.rb', line 15

def container_name(image)
  name = image_name(image)
  raise ArgumentError, "Invalid docker image [#{image}]" if name.nil?

  # Normalize the image name to be used in the container name.
  # This follows RFC 1123 Label names in Kubernetes as they are the most restrictive
  # See https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#dns-label-names
  # and https://github.com/kubernetes/kubernetes/blob/952a9cb0/staging/src/k8s.io/apimachinery/pkg/util/validation/validation.go#L178-L184
  #
  # This does not follow the leading and trailing character restriction because we will embed it
  # below with a prefix and suffix that already conform to the RFC.
  normalized_name = name.downcase.gsub(/[^a-z0-9-]/, "-")[0, MAX_CONTAINER_NAME_SIZE]
  # Ensure that the normalized_name doesn't end in any invalid characters after we
  # limited the length to the MAX_CONTAINER_NAME_SIZE.
  normalized_name.gsub!(/[^a-z0-9]+$/, "")

  "floe-#{normalized_name}-#{SecureRandom.hex(4)}"
end

#image_name(image) ⇒ Object 



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# File 'lib/floe/container_runner/docker_mixin.rb', line 6

def image_name(image)
  image.match(%r{^(?<repository>.+/)?(?<image>.+):(?<tag>.+)$})&.named_captures&.dig("image")
end