Added DNS checks

Author: Dougal Ballantyne

bootstrap/src/scripts/boot_as_compute

@@ -19,6 +19,9 @@ set -x
 # Source functions
 . /opt/cfncluster/scripts/functions.shlib
 
+# Check DNS
+check_dns || error_exit "DNS checks failed."
+
 # Run preinstall script if defined
 run_preinstall
 

bootstrap/src/scripts/boot_as_master

@@ -19,6 +19,9 @@ set -x
 # Source functions
 . /opt/cfncluster/scripts/functions.shlib
 
+# Check DNS
+check_dns || error_exit "DNS checks failed."
+
 # Run preinstall script if defined
 run_preinstall
 

bootstrap/src/scripts/functions.shlib

@@ -15,6 +15,22 @@ function error_exit () {
   exit 1
 }
 
+# Check DNS is working, as it is required for correct operation
+function check_dns () {
+  TRY=0
+  while [ $TRY -lt 3 ]; do
+    hostname -f >/dev/null
+    check_fqdn=$?
+    if [ $check_fqdn -eq 0 ]; then
+      break
+    else
+      sleep 10
+      TRY=$(( $TRY + 1 ))
+    fi
+  done
+  return $check_fqdn
+}
+
 # Check and run preinstall
 function run_preinstall () {
   RC=0