Avoid using ip addresses that does not resolve to a hostname

1 files changed, 19 insertions, 0 deletions

diff --git a/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/provisioning/NodePrioritizerTest.java b/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/provisioning/NodePrioritizerTest.java
index 04c0af5d98a..2deac4e70e8 100644
--- a/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/provisioning/NodePrioritizerTest.java
+++ b/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/provisioning/NodePrioritizerTest.java
@@ -83,4 +83,23 @@ public class NodePrioritizerTest {
         b.addFlavor("d2", 2, 2., 2, Flavor.Type.DOCKER_CONTAINER);
         return b.build();
     }
+
+    @Test
+    public void ignore_hosts_that_is_unresolved_in_dns() {
+        // Random IP that is not resolving
+        String hostname = NodePrioritizer.lookupHostname("34.23.12.23");
+        Assert.assertNull(hostname);
+
+        // Localhost is always resolving
+        hostname = NodePrioritizer.lookupHostname("127.0.0.1");
+        Assert.assertNotNull(hostname);
+
+        // IPv6 Localhost is always resolving to a hostname
+        hostname = NodePrioritizer.lookupHostname("::1");
+        Assert.assertNotNull(hostname);
+
+        // Unspecified IPv6 should not resolve to a hostname
+        hostname = NodePrioritizer.lookupHostname("::");
+        Assert.assertNull(hostname);
+    }
 }