revert removal of EC2HostNameResolver annotation (#78)

denisbr · web-flow · commit 478f8684e392 · 2021-10-29T10:37:47.000+02:00
diff --git a/src/main/java/cloud/localstack/docker/annotation/EC2HostNameResolver.java b/src/main/java/cloud/localstack/docker/annotation/EC2HostNameResolver.java
@@ -0,0 +1,23 @@
+package cloud.localstack.docker.annotation;
+
+import com.amazonaws.util.EC2MetadataUtils;
+
+/**
+ * Finds the hostname of the current EC2 instance
+ *
+ * This is useful for a CI server that is itself a docker container and which mounts the docker unix socket
+ * from the host machine.  In that case, the server cannot spawn child containers but will instead spawn sibling
+ * containers which cannot be addressed at "localhost".  In order to address the sibling containers you need to resolve
+ * the hostname of the host machine, which this method will accomplish.
+ *
+ * For more information about running docker for CI and mounting the host socket please look here:
+ * http://jpetazzo.github.io/2015/09/03/do-not-use-docker-in-docker-for-ci/
+ */
+public class EC2HostNameResolver implements IHostNameResolver {
+
+    @Override
+    public String getHostName() {
+        return EC2MetadataUtils.getLocalHostName();
+    }
+
+}
