cluster/gce: fix line 2414: DNS_MEMORY_LIMIT: unbound variable

Author: mikedanese

cluster/gce/gci/configure-helper.sh

@@ -2376,7 +2376,7 @@ function setup-coredns-manifest {
   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}"
   sed -i -e "s@{{ *pillar\['service_cluster_ip_range'\] *}}@${SERVICE_CLUSTER_IP_RANGE}@g" "${coredns_file}"
-  sed -i -e "s@{{ *pillar\['dns_memory_limit'\] *}}@${DNS_MEMORY_LIMIT}@g" "${coredns_file}"
+  sed -i -e "s@{{ *pillar\['dns_memory_limit'\] *}}@${DNS_MEMORY_LIMIT:-170Mi}@g" "${coredns_file}"
 
   if [[ "${ENABLE_DNS_HORIZONTAL_AUTOSCALER:-}" == "true" ]]; then
     setup-addon-manifests "addons" "dns-horizontal-autoscaler" "gce"
@@ -2428,7 +2428,7 @@ EOF
   # Replace the salt configurations with variable values.
   sed -i -e "s@{{ *pillar\['dns_domain'\] *}}@${DNS_DOMAIN}@g" "${kubedns_file}"
   sed -i -e "s@{{ *pillar\['dns_server'\] *}}@${DNS_SERVER_IP}@g" "${kubedns_file}"
-  sed -i -e "s@{{ *pillar\['dns_memory_limit'\] *}}@${DNS_MEMORY_LIMIT}@g" "${kubedns_file}"
+  sed -i -e "s@{{ *pillar\['dns_memory_limit'\] *}}@${DNS_MEMORY_LIMIT:-170Mi}@g" "${kubedns_file}"
 
   if [[ "${ENABLE_DNS_HORIZONTAL_AUTOSCALER:-}" == "true" ]]; then
     setup-addon-manifests "addons" "dns-horizontal-autoscaler" "gce"