Updates the documentation.

README.md

@@ -29,9 +29,20 @@ Moving along nicely!
 
 ## How to test/develop inside the running container process 
 
-This method uses [nsenter](http://jpetazzo.github.io/2014/06/23/docker-ssh-considered-evil/).  Check out [jpetazzo/nsenter](https://github.com/jpetazzo/nsenter) on GitHub. 
+```
+sudo docker exec -it ybdb /bin/bash
+```
+
+If it produces this error:
+
+```
+rpc error: code = 13 desc = invalid header field value "oci runtime error: exec failed: container_linux.go:247: starting container process caused \"process_linux.go:75: starting setns process caused \\\"fork/exec /proc/self/exe: no such file or directory\\\"\"\n"
+```
+
+then do this before attempting again:
+
 
 ```
-sudo PID=$(docker inspect --format {{.State.Pid}} <container_name_or_ID>)
+docker stop ybdb
-sudo nsenter --target $PID --mount --uts --ipc --net --pid
+docker start ybdb
 ```