zminka o sudo a ch-grow

README.md

@@ -231,7 +231,7 @@ All informations about Charlicloud can be found on its [Charliecloud documentati
 
 1. #### Create or get Docker image
 
-Docker is installed on dw[01-04] workers in gpulab cluster. You can access them using
+Docker is installed on dw[01-05] workers in gpulab cluster. You can access them using
 
 `srun -p debug-lp --pty bash` command.
 
@@ -239,11 +239,19 @@ You can either pull already prepared Docker image (e.g. for TensorFlow) or you m
 You will make this step only once for the given UDSS.
 Of course, you must begin the whole workflow, if there is a new version of the UDSS.
 
+If you are pulling a Docker image, use `sudo` command
+
+`sudo docker pull dockertag`
+
 If you are building your own Docker image, Charliecloud offers simplified version of Docker invocation
 
 `ch-build -t dockertag .`
 
-which must be run on dw[01-04] workers.
+which must be run on dw[01-05] workers.
+
+Latest versions of Charliecloud added a new command `ch-grow`, which builds an image in unprivileged mode from Dockerfile.
+This command doesn't need Docker, it can be run anywhere.
+Moreover, using `ch-grow` command allows you to skip the workflow step 2, because it immediately builds a directory image.
 
 2. #### Create tar/directory or SquashFS image from Docker image