diff --git a/docker_inventory.cf b/docker_inventory.cf
index 5585c80..b46b925 100644
--- a/docker_inventory.cf
+++ b/docker_inventory.cf
@@ -1,25 +1,34 @@
 bundle agent docker_inventory
 {
+  classes:
+    "have_docker" expression => fileexists("${docker}");
+
   vars:
-    "docker" string => "/usr/local/bin/docker"; # todo discover this more dynamically or per-platform
-    "status_list" slist => { "created", "restarting", "running", "removing", "pause", "exited", "dead" };
-    "status_count[${status_list}]" string => execresult(`${docker} ps -a --filter "status=${status_list}" --format "{{.Names}}" | wc -l`, "useshell", "stdout"),
-      meta => { "inventory", "attribute_name=Docker ${status_list} Count" };
-    "running_string" string => execresult(`${docker} ps -a --filter "status=running" --format "{{.Names}}"`, "noshell", "stdout");
-    "running_names" slist => splitstring("${running_string}", "\n", "inf"),
-      meta => { "inventory", "attribute_name=Docker Running Names" };
-    "dangling_count" string => execresult(`${docker} images --filter "dangling=true" --format "{{.Repository}}" | wc -l`, "useshell", "stdout"),
-      meta => { "inventory", "attribute_name=Docker Dangling Image Count" };
-    "images_string" string => execresult(`${docker} images --format "{{.Repository}}:{{.Tag}}"`, "noshell", "stdout");
-    "images_list" slist => splitstring("${images_string}", "\n", "inf"),
-      meta => { "inventory", "attribute_name=Docker Image List" };
+    any::
+      "docker" string => "/usr/local/bin/docker"; # todo discover this more dynamically or per-platform
+
+    have_docker::
+      "status_list" slist => { "created", "restarting", "running", "removing", "pause", "exited", "dead" };
+      "status_count[${status_list}]" string => execresult(`${docker} ps -a --filter "status=${status_list}" --format "{{.Names}}" | wc -l`, "useshell", "stdout"),
+        meta => { "inventory", "attribute_name=Docker ${status_list} Count" };
+      "running_string" string => execresult(`${docker} ps -a --filter "status=running" --format "{{.Names}}"`, "noshell", "stdout");
+      "running_names" slist => splitstring("${running_string}", "\n", "inf"),
+        meta => { "inventory", "attribute_name=Docker Running Names" };
+      "dangling_count" string => execresult(`${docker} images --filter "dangling=true" --format "{{.Repository}}" | wc -l`, "useshell", "stdout"),
+        meta => { "inventory", "attribute_name=Docker Dangling Image Count" };
+      "images_string" string => execresult(`${docker} images --format "{{.Repository}}:{{.Tag}}"`, "noshell", "stdout");
+      "images_list" slist => splitstring("${images_string}", "\n", "inf"),
+        meta => { "inventory", "attribute_name=Docker Image List" };
 
   reports:
-    "docker containers ${status_list}: ${status_count[${status_list}]}";
-    "running_names: ${with}" with => storejson(running_names);
-    "dangling_count: ${dangling_count}";
-    "images_list: ${with}" with => storejson(images_list);
-#    "exited_string: ${exited_string}";
+    any::
+      "Hello from ${this.bundle}";
+
+    have_docker::
+      "docker containers ${status_list}: ${status_count[${status_list}]}";
+      "running_names: ${with}" with => storejson(running_names);
+      "dangling_count: ${dangling_count}";
+      "images_list: ${with}" with => storejson(images_list);
 }
 
 bundle agent main