small update to devguide, updates to READMEs for LXD and Docker

daemon/examples/docker/README.md

@@ -4,13 +4,13 @@ Information on how Docker can be leveraged and included to create
 nodes based on Docker containers and images to interface with
 existing CORE nodes, when needed.
 
-# Installation
+## Installation
 
 ```shell
 sudo apt install docker.io
 ```
 
-# Configuration
+## Configuration
 
 Custom configuration required to avoid iptable rules being added and removing
 the need for the default docker network, since core will be orchestrating
@@ -19,12 +19,28 @@ connections between nodes.
 Place the file below in **/etc/docker/**
 * daemon.json
 
-# Tools and Versions Tested With
+## Group Setup
+
+To use Docker nodes within the python GUI, you will need to make sure the user running the GUI is a member of the
+docker group.
+
+```shell
+# add group if does not exist
+sudo groupadd docker
+
+# add user to group
+sudo usermod -aG docker $USER
+
+# to get this change to take effect, log out and back in or run the following
+newgrp docker
+```
+
+## Tools and Versions Tested With
 
 * Docker version 18.09.5, build e8ff056
 * nsenter from util-linux 2.31.1
 
-# Examples
+## Examples
 
 This directory provides a few small examples creating Docker nodes
 and linking them to themselves or with standard CORE nodes.