changed to use env variable for the docker socket guid

README.md

@@ -11,7 +11,8 @@ Various tools to monitor Docker containers
 
 ## Setup
 
+Set the DOCKER_GUID so the container has permission to access the socket
+
 ```shell
-root@docker:~/docker-observation# getent group docker
-docker:x:995:root
+export DOCKER_GUID=$(getent group docker | awk -F ':' '{print $3}')
 ```