Refactoring env vars to add SE_ prefix (#1603)

In preparation for #1319, which makes it easier to collect the environment variables that matter to configure child containers.

Distributor/start-selenium-grid-distributor.sh

@@ -55,7 +55,7 @@ if [ ! -z "$SE_DISTRIBUTOR_PORT" ]; then
 fi
 
 
-java ${JAVA_OPTS} -jar /opt/selenium/selenium-server.jar distributor \
+java ${JAVA_OPTS:-$SE_JAVA_OPTS} -jar /opt/selenium/selenium-server.jar distributor \
   --sessions-host "${SE_SESSIONS_MAP_HOST}" --sessions-port "${SE_SESSIONS_MAP_PORT}" \
   --sessionqueue-host "${SE_SESSION_QUEUE_HOST}" --sessionqueue-port "${SE_SESSION_QUEUE_PORT}" \
   --publish-events tcp://"${SE_EVENT_BUS_HOST}":"${SE_EVENT_BUS_PUBLISH_PORT}" \

EventBus/start-selenium-grid-eventbus.sh

@@ -19,7 +19,7 @@ if [ ! -z "$SE_OPTS" ]; then
   echo "Appending Selenium options: ${SE_OPTS}"
 fi
 
-java ${JAVA_OPTS} -jar /opt/selenium/selenium-server.jar event-bus \
+java ${JAVA_OPTS:-$SE_JAVA_OPTS} -jar /opt/selenium/selenium-server.jar event-bus \
   --bind-host ${SE_BIND_HOST} \
   ${HOST_CONFIG} \
   ${PORT_CONFIG} \

Hub/start-selenium-grid-hub.sh

@@ -18,7 +18,7 @@ if [ ! -z "$SE_HUB_PORT" ]; then
 fi
 
 
-java ${JAVA_OPTS} -jar /opt/selenium/selenium-server.jar hub \
+java ${JAVA_OPTS:-$SE_JAVA_OPTS} -jar /opt/selenium/selenium-server.jar hub \
   --session-request-timeout ${SE_SESSION_REQUEST_TIMEOUT} \
   --session-retry-interval ${SE_SESSION_RETRY_INTERVAL} \
   --relax-checks ${SE_RELAX_CHECKS} \

NodeBase/Dockerfile.txt

@@ -154,20 +154,24 @@ COPY selenium_grid_logo.png /usr/share/images/fluxbox/ubuntu-light.png
 #============================
 # Some configuration options
 #============================
-ENV SCREEN_WIDTH 1360
-ENV SCREEN_HEIGHT 1020
-ENV SCREEN_DEPTH 24
-ENV SCREEN_DPI 96
+ENV SE_SCREEN_WIDTH 1360
+ENV SE_SCREEN_HEIGHT 1020
+ENV SE_SCREEN_DEPTH 24
+ENV SE_SCREEN_DPI 96
+ENV SE_START_XVFB true
+ENV SE_START_NO_VNC true
+ENV SE_NO_VNC_PORT 7900
+ENV SE_VNC_PORT 5900
 ENV DISPLAY :99.0
 ENV DISPLAY_NUM 99
-ENV START_XVFB true
-ENV START_NO_VNC true
 # Path to the Configfile
 ENV CONFIG_FILE=/opt/selenium/config.toml
 ENV GENERATE_CONFIG true
 # Drain the Node after N sessions. 
 # A value higher than zero enables the feature
-ENV DRAIN_AFTER_SESSION_COUNT 0
+ENV SE_DRAIN_AFTER_SESSION_COUNT 0
+
+
 
 #========================
 # Selenium Configuration

NodeBase/generate_config

@@ -46,7 +46,7 @@ fi
 echo "session-timeout = \"${SE_NODE_SESSION_TIMEOUT}\"" >> "$FILENAME"
 echo "override-max-sessions = ${SE_NODE_OVERRIDE_MAX_SESSIONS}" >> "$FILENAME"
 echo "detect-drivers = false" >> "$FILENAME"
-echo "drain-after-session-count = ${DRAIN_AFTER_SESSION_COUNT}" >> "$FILENAME"
+echo "drain-after-session-count = ${DRAIN_AFTER_SESSION_COUNT:-$SE_DRAIN_AFTER_SESSION_COUNT}" >> "$FILENAME"
 echo "max-sessions = ${SE_NODE_MAX_SESSIONS}
 " >> "$FILENAME"
 

NodeBase/start-novnc.sh

@@ -2,11 +2,11 @@
 #
 # IMPORTANT: Change this file only in directory NodeBase!
 
-if [ "${START_XVFB}" = true ] ; then
-  if [ "${START_NO_VNC}" = true ] ; then
-    /opt/bin/noVNC/utils/launch.sh --listen ${NO_VNC_PORT:-7900} --vnc localhost:${VNC_PORT:-5900}
+if [ "${START_XVFB:-$SE_START_XVFB}" = true ] ; then
+  if [ "${START_NO_VNC:-$SE_START_NO_VNC}" = true ] ; then
+    /opt/bin/noVNC/utils/launch.sh --listen ${NO_VNC_PORT:-$SE_NO_VNC_PORT} --vnc localhost:${VNC_PORT:-$SE_VNC_PORT}
   else
-    echo "noVNC won't start because START_NO_VNC is false."
+    echo "noVNC won't start because SE_START_NO_VNC is false."
   fi
 else
   echo "noVNC won't start because Xvfb is configured to not start."

NodeBase/start-selenium-node.sh

@@ -38,7 +38,7 @@ fi
 echo "Selenium Grid Node configuration: "
 cat "$CONFIG_FILE"
 echo "Starting Selenium Grid Node..."
-java ${JAVA_OPTS} -jar /opt/selenium/selenium-server.jar node \
+java ${JAVA_OPTS:-$SE_JAVA_OPTS} -jar /opt/selenium/selenium-server.jar node \
   --bind-host ${SE_BIND_HOST} \
   --config "$CONFIG_FILE" \
   ${SE_OPTS}

NodeBase/start-vnc.sh

@@ -2,7 +2,7 @@
 #
 # IMPORTANT: Change this file only in directory NodeBase!
 
-if [ "${START_XVFB}" = true ] ; then
+if [ "${START_XVFB:-$SE_START_XVFB}" = true ] ; then
   # Centering wallpaper
   for i in $(seq 1 10)
   do
@@ -14,13 +14,15 @@ if [ "${START_XVFB}" = true ] ; then
     fi    
   done  
 
+  VNC_NO_PASSWORD=${VNC_NO_PASSWORD:-$SE_VNC_NO_PASSWORD}
   if [ ! -z $VNC_NO_PASSWORD ]; then
       echo "Starting VNC server without password authentication"
       X11VNC_OPTS=
   else
       X11VNC_OPTS=-usepw
   fi
 
+  VNC_VIEW_ONLY=${VNC_VIEW_ONLY:-$SE_VNC_VIEW_ONLY}
   if [ ! -z $VNC_VIEW_ONLY ]; then
       echo "Starting VNC server with viewonly option"
       X11VNC_OPTS="${X11VNC_OPTS} -viewonly"
@@ -36,7 +38,7 @@ if [ "${START_XVFB}" = true ] ; then
     echo "Waiting for Xvfb..."
   done
 
-  x11vnc ${X11VNC_OPTS} -forever -shared -rfbport ${VNC_PORT:-5900} -rfbportv6 ${VNC_PORT:-5900} -display ${DISPLAY}
+  x11vnc ${X11VNC_OPTS} -forever -shared -rfbport ${VNC_PORT:-$SE_VNC_PORT} -rfbportv6 ${VNC_PORT:-$SE_VNC_PORT} -display ${DISPLAY}
 else
   echo "Vnc won't start because Xvfb is configured to not start."
 fi

NodeBase/start-xvfb.sh

@@ -1,6 +1,11 @@
 #!/usr/bin/env bash
 
-if [ "${START_XVFB}" = true ] ; then
+SCREEN_WIDTH=${SCREEN_WIDTH:-$SE_SCREEN_WIDTH}
+SCREEN_HEIGHT=${SCREEN_HEIGHT:-$SE_SCREEN_HEIGHT}
+SCREEN_DEPTH=${SCREEN_DEPTH:-$SE_SCREEN_DEPTH}
+SCREEN_DPI=${SCREEN_DPI:-$SE_SCREEN_DPI}
+
+if [ "${START_XVFB:-$SE_START_XVFB}" = true ] ; then
   export GEOMETRY="${SCREEN_WIDTH}""x""${SCREEN_HEIGHT}""x""${SCREEN_DEPTH}"
 
   rm -f /tmp/.X*lock

NodeDocker/start-selenium-grid-docker.sh

@@ -29,7 +29,7 @@ if [ ! -z "$SE_NODE_GRID_URL" ]; then
   SE_GRID_URL="--grid-url ${SE_NODE_GRID_URL}"
 fi
 
-java ${JAVA_OPTS} -jar /opt/selenium/selenium-server.jar node \
+java ${JAVA_OPTS:-$SE_JAVA_OPTS} -jar /opt/selenium/selenium-server.jar node \
   --publish-events tcp://"${SE_EVENT_BUS_HOST}":${SE_EVENT_BUS_PUBLISH_PORT} \
   --subscribe-events tcp://"${SE_EVENT_BUS_HOST}":${SE_EVENT_BUS_SUBSCRIBE_PORT} \
   --bind-host ${SE_BIND_HOST} \

README.md

@@ -40,7 +40,7 @@ Talk to us at https://www.selenium.dev/support/
 * [Kubernetes](#deploying-to-kubernetes)
 * [Configuring the containers](#configuring-the-containers)
   + [SE_OPTS Selenium Configuration Options](#se_opts-selenium-configuration-options)
-  + [JAVA_OPTS Java Environment Options](#java_opts-java-environment-options)
+  + [SE_JAVA_OPTS Java Environment Options](#se_java_opts-java-environment-options)
   + [Node configuration options](#node-configuration-options)
   + [Setting Screen Resolution](#setting-screen-resolution)
   + [Grid Url and Session Timeout](#grid-url-and-session-timeout)
@@ -550,6 +550,38 @@ Here is an example using a Hub and a Node:
 [`docker-compose-v3-dynamic-grid.yml`](docker-compose-v3-dynamic-grid.yml)
 
 
+### Configuring the child containers
+
+Containers can be further configured through environment variables, such as `SE_NODE_SESSION_TIMEOUT`
+and `SE_OPTS`. When a child container is created, all environment variables prefixed with `SE_` will
+be forwared and set in the container. You can set the desired environment variables in the 
+`standalone-docker` or `node-docker` containers. The following example sets the session timeout to
+700 seconds for all sessions:
+
+#### macOS/Linux
+
+```bash
+docker run --rm --name selenium-docker -p 4444:4444 \
+    -e SE_NODE_SESSION_TIMEOUT=700 \
+    -v ${PWD}/config.toml:/opt/bin/config.toml \
+    -v ${PWD}/assets:/opt/selenium/assets \
+    -v /var/run/docker.sock:/var/run/docker.sock \
+    selenium/standalone-docker:4.2.2-20220609
+```
+
+#### Windows PowerShell
+
+```bash
+docker run --rm --name selenium-docker -p 4444:4444 `
+    -e SE_NODE_SESSION_TIMEOUT=700 `
+    -v ${PWD}/config.toml:/opt/bin/config.toml `
+    -v ${PWD}/assets:/opt/selenium/assets `
+    -v /var/run/docker.sock:/var/run/docker.sock `
+    selenium/standalone-docker:4.2.2-20220609
+```
+
+
+
 ### Video recording, screen resolution, and time zones in a Dynamic Grid
 To record your WebDriver session, you need to add a `se:recordVideo` 
 field set to `true`. You can also set a time zone and a screen resolution,
@@ -586,12 +618,12 @@ You can pass `SE_OPTS` variable with additional commandline parameters for start
 $ docker run -d -p 4444:4444 -e SE_OPTS="--log-level FINE" --name selenium-hub selenium/hub:4.2.2-20220609
 ```
 
-### JAVA_OPTS Java Environment Options
+### SE_JAVA_OPTS Java Environment Options
 
-You can pass `JAVA_OPTS` environment variable to java process.
+You can pass `SE_JAVA_OPTS` environment variable to java process.
 
 ``` bash
-$ docker run -d -p 4444:4444 -e JAVA_OPTS=-Xmx512m --name selenium-hub selenium/hub:4.2.2-20220609
+$ docker run -d -p 4444:4444 -e SE_JAVA_OPTS=-Xmx512m --name selenium-hub selenium/hub:4.2.2-20220609
 ```
 
 ### Node configuration options
@@ -614,11 +646,11 @@ $ docker run -d -e SE_EVENT_BUS_HOST=<event_bus_ip|event_bus_name> -e SE_EVENT_B
 ### Setting Screen Resolution
 
 By default, nodes start with a screen resolution of 1360 x 1020 with a color depth of 24 bits and a dpi of 96. 
-These settings can be adjusted by specifying `SCREEN_WIDTH`, `SCREEN_HEIGHT`, `SCREEN_DEPTH`, and/or `SCREEN_DPI` 
+These settings can be adjusted by specifying `SE_SCREEN_WIDTH`, `SE_SCREEN_HEIGHT`, `SE_SCREEN_DEPTH`, and/or `SE_SCREEN_DPI` 
 environmental variables when starting the container.
 
 ``` bash
-docker run -d -e SCREEN_WIDTH=1366 -e SCREEN_HEIGHT=768 -e SCREEN_DEPTH=24 -e SCREEN_DPI=74 selenium/standalone-firefox:4.2.2-20220609
+docker run -d -e SE_SCREEN_WIDTH=1366 -e SE_SCREEN_HEIGHT=768 -e SE_SCREEN_DEPTH=24 -e SE_SCREEN_DPI=74 selenium/standalone-firefox:4.2.2-20220609
 ```
 
 ### Grid Url and Session Timeout
@@ -663,12 +695,12 @@ captured in the same video.
 [Chrome](https://developers.google.com/web/updates/2017/04/headless-chrome), 
 When using headless mode, there's no need for the [Xvfb](https://en.wikipedia.org/wiki/Xvfb) server to be started.
 
-To avoid starting the server you can set the `START_XVFB` environment variable to `false` 
+To avoid starting the server you can set the `SE_START_XVFB` environment variable to `false` 
 (or any other value than `true`), for example:
 
 ``` bash
 $ docker run -d --net grid -e SE_EVENT_BUS_HOST=selenium-hub -e SE_EVENT_BUS_PUBLISH_PORT=4442 \
-  -e SE_EVENT_BUS_SUBSCRIBE_PORT=4443 -e START_XVFB=false --shm-size="2g" selenium/node-chrome:4.2.2-20220609
+  -e SE_EVENT_BUS_SUBSCRIBE_PORT=4443 -e SE_START_XVFB=false --shm-size="2g" selenium/node-chrome:4.2.2-20220609
 ```
 
 For more information, see this GitHub [issue](https://github.com/SeleniumHQ/docker-selenium/issues/567).
@@ -677,11 +709,11 @@ For more information, see this GitHub [issue](https://github.com/SeleniumHQ/dock
 
 In some environments, like Docker Swarm or Kubernetes, it is useful to shut down the Node or Standalone
 container after N tests have been executed. For example, this can be used in Kubernetes to terminate the
-pod and then scale a new one after N sessions. Set the environment variable `DRAIN_AFTER_SESSION_COUNT` to
+pod and then scale a new one after N sessions. Set the environment variable `SE_DRAIN_AFTER_SESSION_COUNT` to
 a value higher than zero to enable this behaviour. 
 
 ``` bash
-$ docker run -e DRAIN_AFTER_SESSION_COUNT=5 --shm-size="2g" selenium/standalone-firefox:4.2.2-20220609
+$ docker run -e SE_DRAIN_AFTER_SESSION_COUNT=5 --shm-size="2g" selenium/standalone-firefox:4.2.2-20220609
 ```
 
 With the previous command, the Standalone container will shutdown after 5 sessions have been executed.
@@ -883,7 +915,7 @@ The VNC server is listening to port 5900, you can use a VNC client and connect t
 any free external port that you wish.
 
 The internal 5900 port remains the same because that is the configured port for the VNC server running inside the container. 
-You can override it with the `VNC_PORT` environment variable in case you want to use `--net=host`.
+You can override it with the `SE_VNC_PORT` environment variable in case you want to use `--net=host`.
 
 Here is an example with the standalone images, the same concept applies to the node images.
 ``` bash
@@ -910,9 +942,9 @@ the posted ones which reconfigures it:
 RUN x11vnc -storepasswd <your-password-here> /home/seluser/.vnc/passwd
 ```
 
-If you want to run VNC without password authentication you can set the environment variable `VNC_NO_PASSWORD=1`.
+If you want to run VNC without password authentication you can set the environment variable `SE_VNC_NO_PASSWORD=1`.
 
-If you want to run VNC in view-only mode you can set the environment variable `VNC_VIEW_ONLY=1`.
+If you want to run VNC in view-only mode you can set the environment variable `SE_VNC_VIEW_ONLY=1`.
 
 ### Using your browser (no VNC client is needed)
 
@@ -921,7 +953,7 @@ their browser. This might come handy if you cannot install a VNC client on your
 noVNC, so you will need to connect to that port with your browser.
 
 Similarly to the previous section, feel free to map port 7900 to any free external port that you wish.
-You can also override it with the `NO_VNC_PORT` environment variable in case you want to use `--net=host`.
+You can also override it with the `SE_NO_VNC_PORT` environment variable in case you want to use `--net=host`.
 
 Here is an example with the standalone images, the same concept applies to the node images.
 ``` bash
@@ -970,7 +1002,7 @@ or
 
 `Message: unknown error: Chrome failed to start: exited abnormally`
 
-The reason _might_ be that you've set the `START_XVFB` environment variable to "false", but forgot to 
+The reason _might_ be that you've set the `SE_START_XVFB` environment variable to "false", but forgot to 
 actually run Firefox, Chrome or Edge in headless mode.
 
 ### Mounting volumes to retrieve downloaded files

Router/start-selenium-grid-router.sh

@@ -49,7 +49,7 @@ if [ ! -z "$SE_ROUTER_PORT" ]; then
   PORT_CONFIG="--port ${SE_ROUTER_PORT}"
 fi
 
-java ${JAVA_OPTS} -jar /opt/selenium/selenium-server.jar router \
+java ${JAVA_OPTS:-$SE_JAVA_OPTS} -jar /opt/selenium/selenium-server.jar router \
   --sessions-host "${SE_SESSIONS_MAP_HOST}" --sessions-port "${SE_SESSIONS_MAP_PORT}" \
   --distributor-host "${SE_DISTRIBUTOR_HOST}" --distributor-port "${SE_DISTRIBUTOR_PORT}" \
   --sessionqueue-host "${SE_SESSION_QUEUE_HOST}" --sessionqueue-port "${SE_SESSION_QUEUE_PORT}" \

SessionQueue/start-selenium-grid-session-queue.sh

@@ -34,7 +34,7 @@ if [ ! -z "$SE_SESSION_QUEUE_PORT" ]; then
   PORT_CONFIG="--port ${SE_SESSION_QUEUE_PORT}"
 fi
 
-java ${JAVA_OPTS} -jar /opt/selenium/selenium-server.jar sessionqueue \
+java ${JAVA_OPTS:-$SE_JAVA_OPTS} -jar /opt/selenium/selenium-server.jar sessionqueue \
   --publish-events tcp://"${SE_EVENT_BUS_HOST}":${SE_EVENT_BUS_PUBLISH_PORT} \
   --subscribe-events tcp://"${SE_EVENT_BUS_HOST}":${SE_EVENT_BUS_SUBSCRIBE_PORT} \
   --session-request-timeout ${SE_SESSION_REQUEST_TIMEOUT} \

Sessions/start-selenium-grid-sessions.sh

@@ -34,7 +34,7 @@ if [ ! -z "$SE_SESSIONS_PORT" ]; then
   PORT_CONFIG="--port ${SE_SESSIONS_PORT}"
 fi
 
-java ${JAVA_OPTS} -jar /opt/selenium/selenium-server.jar sessions \
+java ${JAVA_OPTS:-$SE_JAVA_OPTS} -jar /opt/selenium/selenium-server.jar sessions \
   --publish-events tcp://"${SE_EVENT_BUS_HOST}":${SE_EVENT_BUS_PUBLISH_PORT} \
   --subscribe-events tcp://"${SE_EVENT_BUS_HOST}":${SE_EVENT_BUS_SUBSCRIBE_PORT} \
   --bind-host ${SE_BIND_HOST} \

Standalone/generate_config

@@ -26,7 +26,7 @@ fi
 echo "session-timeout = \"${SE_NODE_SESSION_TIMEOUT}\"" >> "$FILENAME"
 echo "override-max-sessions = ${SE_NODE_OVERRIDE_MAX_SESSIONS}" >> "$FILENAME"
 echo "detect-drivers = false" >> "$FILENAME"
-echo "drain-after-session-count = ${DRAIN_AFTER_SESSION_COUNT}" >> "$FILENAME"
+echo "drain-after-session-count = ${DRAIN_AFTER_SESSION_COUNT:-$SE_DRAIN_AFTER_SESSION_COUNT}" >> "$FILENAME"
 echo "max-sessions = ${SE_NODE_MAX_SESSIONS}
 " >> "$FILENAME"
 

Standalone/start-selenium-standalone.sh

@@ -11,7 +11,7 @@ fi
 echo "Selenium Grid Standalone configuration: "
 cat /opt/selenium/config.toml
 echo "Starting Selenium Grid Standalone..."
-java ${JAVA_OPTS} -jar /opt/selenium/selenium-server.jar standalone \
+java ${JAVA_OPTS:-$SE_JAVA_OPTS} -jar /opt/selenium/selenium-server.jar standalone \
   --bind-host ${SE_BIND_HOST} \
   --config /opt/selenium/config.toml \
   ${SE_OPTS}

StandaloneDocker/start-selenium-grid-docker.sh

@@ -14,7 +14,7 @@ if [ ! -z "$SE_NODE_GRID_URL" ]; then
   SE_GRID_URL="--grid-url ${SE_NODE_GRID_URL}"
 fi
 
-java ${JAVA_OPTS} -jar /opt/selenium/selenium-server.jar standalone \
+java ${JAVA_OPTS:-$SE_JAVA_OPTS} -jar /opt/selenium/selenium-server.jar standalone \
   --relax-checks ${SE_RELAX_CHECKS} \
   --detect-drivers false \
   --bind-host ${SE_BIND_HOST} \

Video/Dockerfile

@@ -32,4 +32,13 @@ RUN  mkdir -p /var/run/supervisor /var/log/supervisor /videos
 ENTRYPOINT ["/opt/bin/entry_point.sh"]
 CMD ["/opt/bin/entry_point.sh"]
 
+ENV DISPLAY_NUM 99
+ENV DISPLAY_CONTAINER_NAME selenium
+ENV SE_SCREEN_WIDTH 1360
+ENV SE_SCREEN_HEIGHT 1020
+ENV SE_FRAME_RATE 15
+ENV SE_CODEC libx264
+ENV SE_PRESET "-preset ultrafast"
+ENV FILE_NAME video.mp4
+
 EXPOSE 9000

Video/video.sh

@@ -1,19 +1,19 @@
 #!/bin/sh
 
-VIDEO_SIZE=${VIDEO_SIZE:-"1360x1020"}
-DISPLAY_CONTAINER_NAME=${DISPLAY_CONTAINER_NAME:-"selenium"}
-DISPLAY=${DISPLAY:-"99"}
-FILE_NAME=${FILE_NAME:-"video.mp4"}
-FRAME_RATE=${FRAME_RATE:-"15"}
-CODEC=${CODEC:-"libx264"}
-PRESET=${PRESET:-"-preset ultrafast"}
+VIDEO_SIZE="${SE_SCREEN_WIDTH}""x""${SE_SCREEN_HEIGHT}"
+DISPLAY_CONTAINER_NAME=${DISPLAY_CONTAINER_NAME}
+DISPLAY_NUM=${DISPLAY_NUM}
+FILE_NAME=${FILE_NAME}
+FRAME_RATE=${FRAME_RATE:-$SE_FRAME_RATE}
+CODEC=${CODEC:-$SE_CODEC}
+PRESET=${PRESET:-$SE_PRESET}
 
 return_code=1
 max_attempts=50
 attempts=0
 echo 'Checking if the display is open...'
 until [ $return_code -eq 0 -o $attempts -eq $max_attempts ]; do
-	xset -display ${DISPLAY_CONTAINER_NAME}:${DISPLAY} b off > /dev/null 2>&1
+	xset -display ${DISPLAY_CONTAINER_NAME}:${DISPLAY_NUM} b off > /dev/null 2>&1
 	return_code=$?
 	if [ $return_code -ne 0 ]; then
 		echo 'Waiting before next display check...'
@@ -23,5 +23,5 @@ until [ $return_code -eq 0 -o $attempts -eq $max_attempts ]; do
 done
 
 # exec replaces the video.sh process with ffmpeg, this makes easier to pass the process termination signal
-exec ffmpeg -y -f x11grab -video_size ${VIDEO_SIZE} -r ${FRAME_RATE} -i ${DISPLAY_CONTAINER_NAME}:${DISPLAY}.0 -codec:v ${CODEC} ${PRESET} -pix_fmt yuv420p "/videos/$FILE_NAME"
+exec ffmpeg -y -f x11grab -video_size ${VIDEO_SIZE} -r ${FRAME_RATE} -i ${DISPLAY_CONTAINER_NAME}:${DISPLAY_NUM}.0 -codec:v ${CODEC} ${PRESET} -pix_fmt yuv420p "/videos/$FILE_NAME"