$GRID_DEBUG support for nodes (#821)

* $GRID_DEBUG support for nodes

* GRID_DEBUG default false, description

Author: kinjelom

NodeBase/Dockerfile.txt

@@ -112,6 +112,8 @@ ENV NODE_UNREGISTER_IF_STILL_DOWN_AFTER 60000
 ENV NODE_DOWN_POLLING_LIMIT 2
 # As string, maps to "applicationName"
 ENV NODE_APPLICATION_NAME ""
+# Debug
+ENV GRID_DEBUG false
 
 # Following line fixes https://github.com/SeleniumHQ/docker-selenium/issues/87
 ENV DBUS_SESSION_BUS_ADDRESS=/dev/null

NodeChrome/generate_config

@@ -21,6 +21,7 @@ cat <<_EOF
   "registerCycle": $NODE_REGISTER_CYCLE,
   "nodePolling": $NODE_POLLING,
   "unregisterIfStillDownAfter": $NODE_UNREGISTER_IF_STILL_DOWN_AFTER,
-  "downPollingLimit": $NODE_DOWN_POLLING_LIMIT
+  "downPollingLimit": $NODE_DOWN_POLLING_LIMIT,
+  "debug": $GRID_DEBUG
 }
 _EOF

NodeFirefox/generate_config

@@ -29,6 +29,7 @@ cat <<_EOF
   "registerCycle": $NODE_REGISTER_CYCLE,
   "nodePolling": $NODE_POLLING,
   "unregisterIfStillDownAfter": $NODE_UNREGISTER_IF_STILL_DOWN_AFTER,
-  "downPollingLimit": $NODE_DOWN_POLLING_LIMIT
+  "downPollingLimit": $NODE_DOWN_POLLING_LIMIT,
+  "debug": $GRID_DEBUG
 }
 _EOF

README.md

@@ -460,3 +460,8 @@ All output is sent to stdout so it can be inspected by running:
 ``` bash
 $ docker logs -f <container-id|container-name>
 ```
+
+You can turn on debugging by passing environment variable to the hub and the nodes containers:
+```
+GRID_DEBUG=true
+```