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custom-resource-definitions

Custom Resource Definitions

Custom resources are discovered via the same mechanism as "standard" k8s resources and can be worked with as such:

Listing the Greetings from the hello operator.

operation = K8s.Client.list("hello-operator.example.com/v1", :greeting, [namespace: "default"])
{:ok, greeting} = K8s.Client.run(operation, :dev)

multiple-clusters

Multiple Clusters

Copying a workloads between two clusters:

Register a staging cluster:

{:ok, staging_conn} = K8s.Conn.from_file("~/.kube/config")

Register a prod cluster:

{:ok, prod_conn} = K8s.Conn.from_service_account() # or from_file/2

Get a list of all deployments in the default prod namespace:

{:ok, prod_conn} = K8s.Conn.from_service_account() # or from_file/2
operation = K8s.Client.list("apps/v1", :deployment, namespace: "default")
{:ok, deployments} = K8s.Client.run(prod_conn, operation)

Map the deployments to operations and async create on staging:

{:ok, staging_conn} = K8s.Conn.from_service_account() # or from_file/2
operations = Enum.map(deployments, fn(deployment) -> K8s.Client.create(deployment) end)

K8s.Client.async(staging_conn, operations)

performing-sub-resource-operations

Performing sub-resource operations

Subresource (eviction|finalize|bindings|binding|approval|scale|status) operations are created in the same way as standard operations using K8s.Operation.build/4, K8s.Operation.build/5, or any K8s.Client function.

Getting a deployment's status:

{:ok, conn} = K8s.Conn.from_file("~/.kube/config")
operation = K8s.Client.get("apps/v1", "deployments/status", name: "nginx", namespace: "default")
{:ok, scale} = K8s.Client.run(conn, operation)

Getting a deployment's scale:

{:ok, conn} = K8s.Conn.from_file("~/.kube/config")
operation = K8s.Client.get("apps/v1", "deployments/scale", [name: "nginx", namespace: "default"])
{:ok, scale} = K8s.Client.run(conn, operation)

There are two forms for mutating subresources.

Evicting a pod with a Pod map:

{:ok, conn} = K8s.Conn.from_file("~/.kube/config")
eviction = %{
  "apiVersion" => "policy/v1beta1",
  "kind" => "Eviction",
  "metadata" => %{
    "name" => "nginx",
  }
}

# Here we use K8s.Resource.build/4 but this k8s resource map could be built manually or retrieved from the k8s API
subject = K8s.Resource.build("v1", "Pod", "default", "nginx")
operation = K8s.Client.create(subject, eviction)
{:ok, resp} = K8s.Client.run(conn, operation)

Evicting a pod by providing details:

{:ok, conn} = K8s.Conn.from_file("~/.kube/config")
eviction = %{
  "apiVersion" => "policy/v1beta1",
  "kind" => "Eviction",
  "metadata" => %{
    "name" => "nginx",
  }
}

subject = K8s.Client.create("v1", "pods/eviction", [namespace: "default", name: "nginx"], eviction)
operation = K8s.Client.create(subject, eviction)
{:ok, resp} = K8s.Client.run(conn, operation)