Merge pull request #71977 from rramkumar1/kube-dns-ordering

cluster/gce/gci/configure-helper.sh

@@ -2296,8 +2296,9 @@ function update-dashboard-controller {
 
 # Sets up the manifests of coreDNS for k8s addons.
 function setup-coredns-manifest {
-  local -r coredns_file="${dst_dir}/dns/coredns/coredns.yaml"
-  mv "${dst_dir}/dns/coredns/coredns.yaml.in" "${coredns_file}"
+  setup-addon-manifests "addons" "0-dns/coredns"
+  local -r coredns_file="${dst_dir}/0-dns/coredns/coredns.yaml"
+  mv "${dst_dir}/0-dns/coredns/coredns.yaml.in" "${coredns_file}"
   # Replace the salt configurations with variable values.
   sed -i -e "s@{{ *pillar\['dns_domain'\] *}}@${DNS_DOMAIN}@g" "${coredns_file}"
   sed -i -e "s@{{ *pillar\['dns_server'\] *}}@${DNS_SERVER_IP}@g" "${coredns_file}"
@@ -2340,8 +2341,9 @@ function setup-fluentd {
 
 # Sets up the manifests of kube-dns for k8s addons.
 function setup-kube-dns-manifest {
-  local -r kubedns_file="${dst_dir}/dns/kube-dns/kube-dns.yaml"
-  mv "${dst_dir}/dns/kube-dns/kube-dns.yaml.in" "${kubedns_file}"
+  setup-addon-manifests "addons" "0-dns/kube-dns"
+  local -r kubedns_file="${dst_dir}/0-dns/kube-dns/kube-dns.yaml"
+  mv "${dst_dir}/0-dns/kube-dns/kube-dns.yaml.in" "${kubedns_file}"
   if [ -n "${CUSTOM_KUBE_DNS_YAML:-}" ]; then
     # Replace with custom GKE kube-dns deployment.
     cat > "${kubedns_file}" <<EOF
@@ -2362,8 +2364,8 @@ EOF
 
 # Sets up the manifests of local dns cache agent for k8s addons.
 function setup-nodelocaldns-manifest {
-  setup-addon-manifests "addons" "dns/nodelocaldns"
-  local -r localdns_file="${dst_dir}/dns/nodelocaldns/nodelocaldns.yaml"
+  setup-addon-manifests "addons" "0-dns/nodelocaldns"
+  local -r localdns_file="${dst_dir}/0-dns/nodelocaldns/nodelocaldns.yaml"
   # Replace the sed configurations with variable values.
   sed -i -e "s/__PILLAR__DNS__DOMAIN__/${DNS_DOMAIN}/g" "${localdns_file}"
   sed -i -e "s/__PILLAR__DNS__SERVER__/${DNS_SERVER_IP}/g" "${localdns_file}"
@@ -2534,11 +2536,17 @@ EOF
       setup-node-termination-handler-manifest
   fi
   if [[ "${ENABLE_CLUSTER_DNS:-}" == "true" ]]; then
+    # Create a new directory for the DNS addon and prepend a "0" on the name.
+    # Prepending "0" to the directory ensures that add-on manager
+    # creates the dns service first. This ensures no other add-on
+    # can "steal" the designated DNS clusterIP.
+    BASE_ADDON_DIR=${KUBE_HOME}/kube-manifests/kubernetes/gci-trusty
+    BASE_DNS_DIR=${BASE_ADDON_DIR}/dns
+    NEW_DNS_DIR=${BASE_ADDON_DIR}/0-dns
+    mkdir ${NEW_DNS_DIR} && mv ${BASE_DNS_DIR}/* ${NEW_DNS_DIR} && rm -r ${BASE_DNS_DIR}
     if [[ "${CLUSTER_DNS_CORE_DNS:-}" == "true" ]]; then
-      setup-addon-manifests "addons" "dns/coredns"
       setup-coredns-manifest
     else
-      setup-addon-manifests "addons" "dns/kube-dns"
       setup-kube-dns-manifest
     fi
     if [[ "${ENABLE_NODELOCAL_DNS:-}" == "true" ]]; then