kubernetes/test/cmd/node-management.sh

#!/usr/bin/env bash

# Copyright 2018 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

set -o errexit
set -o nounset
set -o pipefail

run_cluster_management_tests() {
  set -o nounset
  set -o errexit

  kube::log::status "Testing cluster-management commands"

  kube::test::get_object_assert nodes "{{range.items}}{{$id_field}}:{{end}}" '127.0.0.1:'

  # create test pods we can work with
  kubectl create -f - "${kube_flags[@]}" << __EOF__
{
  "kind": "Pod",
  "apiVersion": "v1",
  "metadata": {
    "name": "test-pod-1",
    "labels": {
      "e": "f"
    }
  },
  "spec": {
    "containers": [
      {
        "name": "container-1",
        "resources": {},
        "image": "test-image"
      }
    ]
  }
}
__EOF__

  kubectl create -f - "${kube_flags[@]}" << __EOF__
{
  "kind": "Pod",
  "apiVersion": "v1",
  "metadata": {
    "name": "test-pod-2",
    "labels": {
      "c": "d"
    }
  },
  "spec": {
    "containers": [
      {
        "name": "container-1",
        "resources": {},
        "image": "test-image"
      }
    ]
  }
}
__EOF__

  # taint/untaint
  # Pre-condition: node doesn't have dedicated=foo:PreferNoSchedule taint
  kube::test::get_object_assert "nodes 127.0.0.1" '{{range .spec.taints}}{{if eq .key \"dedicated\"}}{{.key}}={{.value}}:{{.effect}}{{end}}{{end}}' "" # expect no output
  # taint can add a taint
  kubectl taint node 127.0.0.1 dedicated=foo:PreferNoSchedule
  kube::test::get_object_assert "nodes 127.0.0.1" '{{range .spec.taints}}{{if eq .key \"dedicated\"}}{{.key}}={{.value}}:{{.effect}}{{end}}{{end}}' "dedicated=foo:PreferNoSchedule"
  # taint can remove a taint
  kubectl taint node 127.0.0.1 dedicated-
  # Post-condition: node doesn't have dedicated=foo:PreferNoSchedule taint
  kube::test::get_object_assert "nodes 127.0.0.1" '{{range .spec.taints}}{{if eq .key \"dedicated\"}}{{.key}}={{.value}}:{{.effect}}{{end}}{{end}}' "" # expect no output

  ### kubectl cordon update with --dry-run does not mark node unschedulable
  # Pre-condition: node is schedulable
  kube::test::get_object_assert "nodes 127.0.0.1" "{{.spec.unschedulable}}" '<no value>'
  kubectl cordon "127.0.0.1" --dry-run
  kube::test::get_object_assert "nodes 127.0.0.1" "{{.spec.unschedulable}}" '<no value>'

  ### kubectl drain update with --dry-run does not mark node unschedulable
  # Pre-condition: node is schedulable
  kube::test::get_object_assert "nodes 127.0.0.1" "{{.spec.unschedulable}}" '<no value>'
  kubectl drain "127.0.0.1" --dry-run
  # Post-condition: node still exists, node is still schedulable
  kube::test::get_object_assert nodes "{{range.items}}{{$id_field}}:{{end}}" '127.0.0.1:'
  kube::test::get_object_assert "nodes 127.0.0.1" "{{.spec.unschedulable}}" '<no value>'

  ### kubectl drain with --pod-selector only evicts pods that match the given selector
  # Pre-condition: node is schedulable
  kube::test::get_object_assert "nodes 127.0.0.1" "{{.spec.unschedulable}}" '<no value>'
  # Pre-condition: test-pod-1 and test-pod-2 exist
  kube::test::get_object_assert "pods" "{{range .items}}{{.metadata.name}},{{end}}" 'test-pod-1,test-pod-2,'
  kubectl drain "127.0.0.1" --pod-selector 'e in (f)'
  # only "test-pod-1" should have been matched and deleted - test-pod-2 should still exist
  kube::test::get_object_assert "pods/test-pod-2" "{{.metadata.name}}" 'test-pod-2'
  # delete pod no longer in use
  kubectl delete pod/test-pod-2
  # Post-condition: node is schedulable
  kubectl uncordon "127.0.0.1"
  kube::test::get_object_assert "nodes 127.0.0.1" "{{.spec.unschedulable}}" '<no value>'

  ### kubectl uncordon update with --dry-run is a no-op
  # Pre-condition: node is already schedulable
  kube::test::get_object_assert "nodes 127.0.0.1" "{{.spec.unschedulable}}" '<no value>'
  response=$(kubectl uncordon "127.0.0.1" --dry-run)
  kube::test::if_has_string "${response}" 'already uncordoned'
  # Post-condition: node is still schedulable
  kube::test::get_object_assert "nodes 127.0.0.1" "{{.spec.unschedulable}}" '<no value>'

  ### kubectl drain command fails when both --selector and a node argument are given
  # Pre-condition: node exists and contains label test=label
  kubectl label node "127.0.0.1" "test=label"
  kube::test::get_object_assert "nodes 127.0.0.1" '{{.metadata.labels.test}}' 'label'
  response=$(! kubectl drain "127.0.0.1" --selector test=label 2>&1)
  kube::test::if_has_string "${response}" 'cannot specify both a node name'

  ### kubectl cordon command fails when no arguments are passed
  # Pre-condition: node exists
  response=$(! kubectl cordon 2>&1)
  kube::test::if_has_string "${response}" 'error\: USAGE\: cordon NODE'

  ### kubectl cordon selects no nodes with an empty --selector=
  # Pre-condition: node "127.0.0.1" is uncordoned
  kubectl uncordon "127.0.0.1"
  response=$(! kubectl cordon --selector= 2>&1)
  kube::test::if_has_string "${response}" 'must provide one or more resources'
  # test=label matches our node
  response=$(kubectl cordon --selector test=label)
  kube::test::if_has_string "${response}" 'node/127.0.0.1 cordoned'
  # invalid=label does not match any nodes
  response=$(kubectl cordon --selector invalid=label)
  kube::test::if_has_not_string "${response}" 'cordoned'
  # Post-condition: node "127.0.0.1" is cordoned
  kube::test::get_object_assert "nodes 127.0.0.1" "{{.spec.unschedulable}}" 'true'

  set +o nounset
  set +o errexit
}