diff --git a/federation/cluster/common.sh b/federation/cluster/common.sh
index 50fe6016804..4bcc151828b 100644
--- a/federation/cluster/common.sh
+++ b/federation/cluster/common.sh
@@ -54,6 +54,15 @@ KUBE_BUILD_STAGE=${KUBE_BUILD_STAGE:-release-stage}
 
 source "${KUBE_ROOT}/cluster/common.sh"
 
+# kubefed configuration
+FEDERATION_KUBE_CONTEXT="${FEDERATION_KUBE_CONTEXT:-e2e-federation}"
+HOST_CLUSTER_CONTEXT="${FEDERATION_HOST_CLUSTER_CONTEXT:-${1}}"
+
+# kube-dns configuration.
+KUBEDNS_CONFIGMAP_NAME="kube-dns"
+KUBEDNS_CONFIGMAP_NAMESPACE = "kube-system"
+KUBEDNS_FEDERATION_FLAG="federations"
+
 host_kubectl="${KUBE_ROOT}/cluster/kubectl.sh --namespace=${FEDERATION_NAMESPACE}"
 
 # required:
diff --git a/federation/cluster/federation-up.sh b/federation/cluster/federation-up.sh
index 46a3271f46e..606ea61cc6c 100755
--- a/federation/cluster/federation-up.sh
+++ b/federation/cluster/federation-up.sh
@@ -29,13 +29,15 @@ 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_PUSH_REPO_BASE and $FEDERATION_NAMESPACE.
+# For $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="${FEDERATION_NAME:-e2e-federation}"
-FEDERATION_KUBE_CONTEXT="${FEDERATION_KUBE_CONTEXT:-e2e-federation}"
+
 DNS_ZONE_NAME="${FEDERATION_DNS_ZONE_NAME:-}"
-HOST_CLUSTER_CONTEXT="${FEDERATION_HOST_CLUSTER_CONTEXT:-${1}}"
+FEDERATIONS_DOMAIN_MAP="${FEDERATIONS_DOMAIN_MAP:-}"
 
 # get_version returns the version in KUBERNETES_RELEASE or defaults to the
 # value in the federation `versions` file.