Move kube-dns ConfigMap creation/deletion out of federated services e2e tests to…

cluster/kube-util.sh

@@ -36,11 +36,17 @@ fi
 # Federation utils
 
 # Sets the kubeconfig context value for the current cluster.
+# Args:
+#   $1: zone (required)
 #
 # Vars set:
 #   CLUSTER_CONTEXT
 function kubeconfig-federation-context() {
-  CLUSTER_CONTEXT="federation-e2e-${KUBERNETES_PROVIDER}-$zone"
+  if [[ -z "${1:-}" ]]; then
+    echo "zone parameter is required"
+    exit 1
+  fi
+  CLUSTER_CONTEXT="federation-e2e-${KUBERNETES_PROVIDER}-${1}"
 }
 
 

federation/cluster/common.sh

@@ -15,6 +15,60 @@
 # required:
 # KUBE_ROOT: path of the root of the Kubernetes reposiitory
 
+: "${KUBE_ROOT?Must set KUBE_ROOT env var}"
+
+# Provides the $KUBERNETES_PROVIDER, kubeconfig-federation-context()
+# and detect-project function
+source "${KUBE_ROOT}/cluster/kube-util.sh"
+
+# kubefed configuration
+FEDERATION_NAME="${FEDERATION_NAME:-e2e-federation}"
+FEDERATION_NAMESPACE=${FEDERATION_NAMESPACE:-federation-system}
+FEDERATION_KUBE_CONTEXT="${FEDERATION_KUBE_CONTEXT:-e2e-federation}"
+HOST_CLUSTER_ZONE="${FEDERATION_HOST_CLUSTER_ZONE:-}"
+# If $HOST_CLUSTER_ZONE isn't specified, arbitrarily choose
+# last zone as the host cluster zone.
+if [[ -z "${HOST_CLUSTER_ZONE}" ]]; then
+  E2E_ZONES_ARR=($E2E_ZONES)
+  HOST_CLUSTER_ZONE=${E2E_ZONES_ARR[-1]}
+fi
+
+HOST_CLUSTER_CONTEXT="${FEDERATION_HOST_CLUSTER_CONTEXT:-}"
+if [[ -z "${HOST_CLUSTER_CONTEXT}" ]]; then
+  # Sets ${CLUSTER_CONTEXT}
+  kubeconfig-federation-context "${HOST_CLUSTER_ZONE:-}"
+  HOST_CLUSTER_CONTEXT="${CLUSTER_CONTEXT}"
+fi
+
+# kube-dns configuration.
+KUBEDNS_CONFIGMAP_NAME="kube-dns"
+KUBEDNS_CONFIGMAP_NAMESPACE="kube-system"
+KUBEDNS_FEDERATION_FLAG="federations"
+
+function federation_cluster_contexts() {
+  local -r contexts=$("${KUBE_ROOT}/cluster/kubectl.sh" config get-contexts -o name)
+  federation_contexts=()
+  for context in ${contexts}; do
+    # Skip federation context
+    if [[ "${context}" == "${FEDERATION_NAME}" ]]; then
+      continue
+    fi
+    # Skip contexts not beginning with "federation"
+    if [[ "${context}" != federation* ]]; then
+      continue
+    fi
+    federation_contexts+=("${context}")
+  done
+  echo ${federation_contexts[@]}
+}
+
+
+#-----------------------------------------------------------------#
+# NOTE:                                                           #
+# Everything below this line is deprecated. It will be removed    #
+# once we have sufficient confidence in kubefed based testing.    #
+#-----------------------------------------------------------------#
+
 # optional override
 # FEDERATION_IMAGE_REPO_BASE: repo which federated images are tagged under (default gcr.io/google_containers)
 # FEDERATION_NAMESPACE: name of the namespace will created for the federated components in the underlying cluster.
@@ -22,10 +76,9 @@
 # KUBE_ARCH
 # KUBE_BUILD_STAGE
 
-: "${KUBE_ROOT?Must set KUBE_ROOT env var}"
+source "${KUBE_ROOT}/cluster/common.sh"
 
-# Provides the $KUBERNETES_PROVIDER variable and detect-project function
-source "${KUBE_ROOT}/cluster/kube-util.sh"
+host_kubectl="${KUBE_ROOT}/cluster/kubectl.sh --namespace=${FEDERATION_NAMESPACE}"
 
 # If $FEDERATION_PUSH_REPO_BASE isn't set, then set the GCR registry name
 # based on the detected project name for gce and gke providers.
@@ -46,7 +99,6 @@ if [[ -z "${FEDERATION_PUSH_REPO_BASE}" ]]; then
 fi
 
 FEDERATION_IMAGE_REPO_BASE=${FEDERATION_IMAGE_REPO_BASE:-'gcr.io/google_containers'}
-FEDERATION_NAMESPACE=${FEDERATION_NAMESPACE:-federation-system}
 
 KUBE_PLATFORM=${KUBE_PLATFORM:-linux}
 KUBE_ARCH=${KUBE_ARCH:-amd64}

federation/cluster/federation-down.sh

@@ -20,8 +20,46 @@ set -o pipefail
 
 KUBE_ROOT=$(readlink -m $(dirname "${BASH_SOURCE}")/../../)
 
-. ${KUBE_ROOT}/federation/cluster/common.sh
+# For $FEDERATION_NAME, $FEDERATION_KUBE_CONTEXT, $HOST_CLUSTER_CONTEXT,
+# $KUBEDNS_CONFIGMAP_NAME and $KUBEDNS_CONFIGMAP_NAMESPACE.
+source "${KUBE_ROOT}/federation/cluster/common.sh"
 
-cleanup-federation-api-objects
+# unjoin_clusters unjoins all the clusters from federation.
+function unjoin_clusters() {
+  for context in $(federation_cluster_contexts); do
+    kube::log::status "Unjoining cluster \"${context}\" from federation \"${FEDERATION_NAME}\""
 
-$host_kubectl delete ns/${FEDERATION_NAMESPACE}
+    "${KUBE_ROOT}/federation/develop/kubefed.sh" unjoin \
+        "${context}" \
+        --context="${FEDERATION_KUBE_CONTEXT}" \
+        --host-cluster-context="${HOST_CLUSTER_CONTEXT}"
+
+    # Delete kube-dns configmap that contains federation
+    # configuration from each cluster.
+    # TODO: This shouldn't be required after
+    # https://github.com/kubernetes/kubernetes/pull/39338.
+    # Remove this after the PR is merged.
+    kube::log::status "Deleting \"kube-dns\" ConfigMap from \"kube-system\" namespace in cluster \"${context}\""
+    "${KUBE_ROOT}/cluster/kubectl.sh" delete configmap \
+        --context="${context}" \
+        --namespace="${KUBEDNS_CONFIGMAP_NAMESPACE}" \
+        "${KUBEDNS_CONFIGMAP_NAME}"
+  done
+}
+
+unjoin_clusters
+
+cleanup-federation-api-objects || echo "Couldn't cleanup federation api objects"
+
+"${KUBE_ROOT}/cluster/kubectl.sh" delete namespace \
+    --context="${HOST_CLUSTER_CONTEXT}" \
+    "${FEDERATION_NAMESPACE}"
+
+# TODO(madhusudancs): This is an arbitrary amount of sleep to give Kubernetes
+# clusters enough time to delete the underlying cloud provider resources
+# corresponding to the Kubernetes resources we deleted as part of the test
+# teardowns. It is shameful that we are doing this, but this is just a bandage
+# to stop the bleeding. Please don't use this pattern anywhere. Remove this
+# when proper cloud provider cleanups are implemented in the individual test
+# `AfterEach` blocks.
+sleep 2m

federation/cluster/federation-up.sh

@@ -29,13 +29,11 @@ KUBE_ROOT=$(dirname "${BASH_SOURCE}")/../..
 # For `kube::log::status` function since it already sources
 # "${KUBE_ROOT}/cluster/lib/logging.sh" and DEFAULT_KUBECONFIG
 source "${KUBE_ROOT}/cluster/common.sh"
-# For $FEDERATION_KUBE_CONTEXT, $HOST_CLUSTER_CONTEXT,
+# For $FEDERATION_NAME, $FEDERATION_KUBE_CONTEXT, $HOST_CLUSTER_CONTEXT,
 # $KUBEDNS_CONFIGMAP_NAME, $KUBEDNS_CONFIGMAP_NAMESPACE and
 # $KUBEDNS_FEDERATION_FLAG.
 source "${KUBE_ROOT}/federation/cluster/common.sh"
 
-FEDERATION_NAME="${FEDERATION_NAME:-e2e-federation}"
-
 DNS_ZONE_NAME="${FEDERATION_DNS_ZONE_NAME:-}"
 FEDERATIONS_DOMAIN_MAP="${FEDERATIONS_DOMAIN_MAP:-}"
 
@@ -90,23 +88,27 @@ function init() {
 # join_clusters joins the clusters in the local kubeconfig to federation. The clusters
 # and their kubeconfig entries in the local kubeconfig are created while deploying clusters, i.e. when kube-up is run.
 function join_clusters() {
-  for cluster in $("${KUBE_ROOT}/cluster/kubectl.sh" config get-clusters |sed -n '1!p'); do
-    # Skip federation context
-    if [[ "${cluster}" == "${FEDERATION_NAME}" ]]; then
-      continue
-    fi
-    # Skip contexts not beginning with "federation"
-    if [[ "${cluster}" != federation* ]]; then
-      continue
-    fi
-
-  kube::log::status "Joining cluster with name '${cluster}' to federation with name '${FEDERATION_NAME}'"
-
-  "${KUBE_ROOT}/federation/develop/kubefed.sh" join \
-      "${cluster}" \
-      --host-cluster-context="${HOST_CLUSTER_CONTEXT}" \
-      --context="${FEDERATION_NAME}" \
-      --secret-name="${cluster//_/-}"    # Replace "_" by "-"
+  for context in $(federation_cluster_contexts); do
+    kube::log::status "Joining cluster with name '${context}' to federation with name '${FEDERATION_NAME}'"
+
+    "${KUBE_ROOT}/federation/develop/kubefed.sh" join \
+        "${context}" \
+        --host-cluster-context="${HOST_CLUSTER_CONTEXT}" \
+        --context="${FEDERATION_NAME}" \
+        --secret-name="${context//_/-}"    # Replace "_" by "-"
+
+
+    # Create kube-dns configmap in each cluster for kube-dns to accept
+    # federation queries.
+    # TODO: This shouldn't be required after
+    # https://github.com/kubernetes/kubernetes/pull/39338.
+    # Remove this after the PR is merged.
+    kube::log::status "Creating \"kube-dns\" ConfigMap in \"kube-system\" namespace in cluster \"${context}\""
+    "${KUBE_ROOT}/cluster/kubectl.sh" create configmap \
+        --context="${context}" \
+        --namespace="${KUBEDNS_CONFIGMAP_NAMESPACE}" \
+        "${KUBEDNS_CONFIGMAP_NAME}" \
+        --from-literal="${KUBEDNS_FEDERATION_FLAG}"="${FEDERATIONS_DOMAIN_MAP}"
   done
 }
 

test/e2e_federation/federated-service.go

@@ -157,26 +157,6 @@ var _ = framework.KubeDescribe("Federated Services [Feature:Federation]", func()
 				fedframework.SkipUnlessFederated(f.ClientSet)
 
 				nsName := f.FederationNamespace.Name
-				// Create kube-dns configmap for kube-dns to accept federation queries.
-				federationsDomainMap := os.Getenv("FEDERATIONS_DOMAIN_MAP")
-				if federationsDomainMap == "" {
-					framework.Failf("missing required env var FEDERATIONS_DOMAIN_MAP")
-				}
-				kubeDNSConfigMap := v1.ConfigMap{
-					ObjectMeta: metav1.ObjectMeta{
-						Name:      KubeDNSConfigMapName,
-						Namespace: KubeDNSConfigMapNamespace,
-					},
-					Data: map[string]string{
-						"federations": federationsDomainMap,
-					},
-				}
-				// Create this configmap in all clusters.
-				for clusterName, cluster := range clusters {
-					By(fmt.Sprintf("Creating kube dns config map in cluster: %s", clusterName))
-					_, err := cluster.Clientset.Core().ConfigMaps(KubeDNSConfigMapNamespace).Create(&kubeDNSConfigMap)
-					framework.ExpectNoError(err, fmt.Sprintf("Error in creating config map in cluster %s", clusterName))
-				}
 
 				createBackendPodsOrFail(clusters, nsName, FederatedServicePodName)
 
@@ -232,13 +212,6 @@ var _ = framework.KubeDescribe("Federated Services [Feature:Federation]", func()
 				} else {
 					By("No service shards to delete. `serviceShard` is nil")
 				}
-
-				// Delete the kube-dns config map from all clusters.
-				for clusterName, cluster := range clusters {
-					By(fmt.Sprintf("Deleting kube dns config map from cluster: %s", clusterName))
-					err := cluster.Clientset.Core().ConfigMaps(KubeDNSConfigMapNamespace).Delete(KubeDNSConfigMapName, nil)
-					framework.ExpectNoError(err, fmt.Sprintf("Error in deleting config map from cluster %s", clusterName))
-				}
 			})
 
 			It("should be able to discover a federated service", func() {