Merge pull request #101781 from ptabor/20210506-retry-dns-resolve

Retry hostname->IP: [Errno -2] Name or service not known

cluster/gce/gci/configure-helper.sh

@@ -1786,7 +1786,27 @@ function start-kube-proxy {
 # $5: pod name, which should be either etcd or etcd-events
 function prepare-etcd-manifest {
   local host_name=${ETCD_HOSTNAME:-$(hostname -s)}
-  local -r host_ip=$(python3 -c "import socket;print(socket.gethostbyname(\"${host_name}\"))")
+
+  local resolve_host_script_py='
+import socket
+import time
+import sys
+
+timeout_sec=300
+
+def resolve(host):
+  for attempt in range(timeout_sec):
+    try:
+      print(socket.gethostbyname(host))
+      break
+    except Exception as e:
+      sys.stderr.write("error: resolving host %s to IP failed: %s\n" % (host, e))
+      time.sleep(1)
+      continue
+
+'
+
+  local -r host_ip=$(python3 -c "${resolve_host_script_py}"$'\n'"resolve(\"${host_name}\")")
   local etcd_cluster=""
   local cluster_state="new"
   local etcd_protocol="http"