Adding info for Grid URL and Session Timeout (#1238)

Author: diemol

NodeBase/Dockerfile.txt

@@ -141,6 +141,8 @@ ENV START_XVFB true
 #========================
 # As integer, maps to "max-concurrent-sessions"
 ENV SE_NODE_MAX_SESSIONS 1
+# As integer, maps to "session-timeout" in seconds
+ENV SE_NODE_SESSION_TIMEOUT 300
 
 # Following line fixes https://github.com/SeleniumHQ/docker-selenium/issues/87
 ENV DBUS_SESSION_BUS_ADDRESS=/dev/null

NodeBase/generate_config

@@ -30,6 +30,7 @@ if [[ -z "${SE_NODE_GRID_URL}" ]]; then
 else
   echo "grid-url = \"${SE_NODE_GRID_URL}\"" >> /opt/selenium/config.toml
 fi
+echo "session-timeout = \"${SE_NODE_SESSION_TIMEOUT}\"" >> /opt/selenium/config.toml
 echo "max-sessions = ${SE_NODE_MAX_SESSIONS}
 " >> /opt/selenium/config.toml
 

README.md

@@ -404,6 +404,14 @@ environmental variables when starting the container.
 docker run -d -e SCREEN_WIDTH=1366 -e SCREEN_HEIGHT=768 -e SCREEN_DEPTH=24 -e SCREEN_DPI=74 selenium/standalone-firefox
 ```
 
+### Grid Url and Session Timeout
+
+In some use cases you might need to set the Grid url to the Node, for example if you'd like to access the CDP endpoint. You
+can do that through the `SE_NODE_GRID_URL` environment variable. 
+
+Grid has a default session timeout of 300 seconds, where the session can be on a stale state until it is killed. You can use
+`SE_NODE_SESSION_TIMEOUT` to overwrite that value in seconds.
+
 ### Running in Headless mode
 
 [Firefox](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Headless_mode),