[dock][Host] Add function to retrieve ip address of container

beat/core/dock.py

@@ -546,6 +546,25 @@ class Host(object):
         return status, output
 
 
+    def get_ipaddress(self, container):
+        """ Returns the ip address of the given container"""
+
+        cmd = [
+            'docker',
+            'inspect',
+            '--format',
+            '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}',
+            container.id
+        ]
+
+        (status, stdout, stderr) = self._exec(cmd)
+
+        if status != 0:
+            logger.error("Failed to retrieve the ip address of the container, reason:\n\n%s", stderr)
+            return None
+
+        return stdout.replace('\n', '')
+
     def _exec(self, command, timeout=None):
         process_stdout = tempfile.NamedTemporaryFile()
         process_stderr = tempfile.NamedTemporaryFile()