Microservice acting like Selenium Hub, but launching Selenium nodes within Docker containers per session request.

1. Install Docker.

2. Create /etc/selenoud/images.json file. This file maps browser versions to Docker containers. The file must have the following structure:

   {
     "images": {
       "chrome": { "image": "selenium/node-chrome:latest", "path": "/wd/hub/", "shmSize": 268435456 },
       "chrome:50.0.2661.86": { "image": "selenium/node-chrome:latest" },
       "chrome:50.0": {"image": "selenium/node-chrome:latest" },
       "chrome:50": { "image": "selenium/node-chrome:latest" },
       "firefox": { "image": "selenium/node-firefox:latest" },
       "firefox:45.0.2": { "image": "selenium/node-firefox:latest" },
       "firefox:45": { "image": "selenium/node-firefox:latest" }
     },
     "environment": [
       "HUB_PORT_4444_TCP_ADDR=$hubHost",
       "HUB_PORT_4444_TCP_PORT=$hubPort",
       "REMOTE_HOST=$name",
       "SE_OPTS=-port $port -Djava.security.egd=file:/dev/random",
       "DISPLAY=:$port"
     ]
   }

   In this file:

   • images section specifies the list of used Docker images (every image will be pulled from repo upon start). An optional path parameter allows you to specify base URL used to create Selenium sessions (e.g. /wd/hub/ for standard Selenium server). An optional shmSize parameter allows you to specify the ShmSize parameter of container.
   • environment section represents the array of environment variables, that will be passed to the launching docker container. You can use the following variables here: $hubHost, $hubPort, $name, $port, that represent host of this service, port of this service, name of a launching container and port of a launching container.

3. Create /etc/selenoud/log4j.properties file. This is the logging configuration:

   # suppress inspection "UnusedProperty" for whole file
   log4j.rootLogger=INFO, logger, selenoud
   
   # Enable lines below for debug purposes
   #log4j.logger.ru.qatools.selenoud=TRACE
   #log4j.selenoud.ru.qatools.selenoud=TRACE
   
   # CONSOLE appender not used by default
   log4j.appender.logger=org.apache.log4j.ConsoleAppender
   log4j.appender.logger.layout=org.apache.log4j.PatternLayout
   log4j.appender.logger.layout.ConversionPattern=%d [%-10.10t] %-5p %c{1} - %m%n
   
   log4j.appender.selenoud=org.apache.log4j.DailyRollingFileAppender
   log4j.appender.selenoud.MaxFileSize=2GB
   log4j.appender.selenoud.File=/var/log/selenoud/selenoud.log
   log4j.appender.selenoud.bufferSize=5242880
   log4j.appender.selenoud.MaxBackupIndex=7
   log4j.appender.selenoud.layout=org.apache.log4j.PatternLayout
   log4j.appender.selenoud.layout.ConversionPattern=%d [%-30.30t] %-5p %-30.30c{1} - %m%n
   

4. Start Selenoud container:

   $ docker run \
       -v /etc/selenoud/:/etc/selenoud:ro \
       -v /var/log/selenoud/:/var/log/selenoud \
       -v /var/run/docker.sock:/var/run/docker.sock \
       --name selenoud \
       --privileged \
       --restart=always \
       --net host \
       --log-opt max-size=1g \
       --log-opt max-file=2 \
       -e JAVA_OPTS="-Dlog4j.configuration=file:/etc/selenoud/log4j.properties
         -DimagesFile=/etc/selenoud/images.json
         -Dlogs.dir=/var/log/selenoud/logs" \
       -d seleniumkit/selenoud:latest
   

5. Run your tests using the following Selenium URL:

   http://localhost:4444/wd/hub
   

6. See log files for each session in /var/log/selenoud/logs.

Selenoud supports the following System properties:

host=localhost                                          # host to listen on (for node to connect to)
port=4444                                               # port to listen on
limit.threads=200                                       # how many threads will be used
limit.bodyLength=10485760                               # maximum request body size (bytes)
limit.count=0                                           # max containers (0 - unlimited)
limit.startupSec=60                                     # max node startup (sec)
limit.inactivitySec=120                                 # max node inactivity (sec)
limit.readTimeoutSec=60                                 # timeout to read from node (sec)
limit.connectTimeoutSec=10                              # timeout to connect to node (sec)
limit.watcherIntervalMs=5000                            # interval(ms) of freezed containers watcher
cloud.host=172.17.0.1                                   # host to connect
container.port=4455                                     # port to use inside container (when network is bridge)
docker.network=bridge                                   # docker network driver (default: bridge)
docker.endpoint=unix:///var/run/docker.sock             # default docker endpoint
docker.pull.enabled=false                               # should we pull image per request? 
log4j.configuration=file:/etc/selenoud/log4j.properties # config for log4j
imagesFile=/etc/selenoud/images.json                    # images config file
logsCollector=ru.qatools.selenoud.docker.ToFileDockerLogCollector # containers logs collector
logs.dir=/tmp/selenoud/logs                             # where to put all the containers logs

$ ./gradlew clean build

Then you can find the distribution under build/distributions directory.

To start the basic app type:

$ ./gradlew run

To run Selenoud in production mode:

$ JAVA_OPTS="-Dport=4444 -Dthreads=1000" ./bin/selenoud

$ ./gradlew clean build docker