Error R10 (Boot timeout) > Web process failed to bind to $PORT within 90 seconds of launch

Question

I'm deploying an Docker image with CMD line in it :

CMD ["java","-XX:+UnlockExperimentalVMOptions","-XX:+UseCGroupMemoryLimitForHeap","-Djava.security.egd=file:/dev/./urandom","-Dspring.server.port=$PORT","-Dserver.port=$PORT","-jar","/life-project.jar"]

while in the log it looks like :

2018-08-06T10:51:17.489612+00:00 heroku[web.1]: Starting process with command java -XX:\+UnlockExperimentalVMOptions -XX:\+UseCGroupMemoryLimitForHeap -Djava.security.egd\=file:/dev/./urandom -Dspring.server.port\=\48227 -Dserver.port\=\48227 -jar /life-project.jar

with the following error :

2018-08-06T10:51:26.106011+00:00 app[web.1]: ***************************
2018-08-06T10:51:26.106012+00:00 app[web.1]: APPLICATION FAILED TO START
2018-08-06T10:51:26.106014+00:00 app[web.1]: ***************************
2018-08-06T10:51:26.106015+00:00 app[web.1]:
2018-08-06T10:51:26.106017+00:00 app[web.1]: Description:
2018-08-06T10:51:26.106018+00:00 app[web.1]:
2018-08-06T10:51:26.106020+00:00 app[web.1]: Failed to bind properties under 'server.port' to java.lang.Integer:
2018-08-06T10:51:26.106021+00:00 app[web.1]:
2018-08-06T10:51:26.106022+00:00 app[web.1]: Property: server.port
2018-08-06T10:51:26.106024+00:00 app[web.1]: Value: $PORT
2018-08-06T10:51:26.106025+00:00 app[web.1]: Origin: "server.port" from property source "systemProperties"
2018-08-06T10:51:26.106026+00:00 app[web.1]: Reason: failed to convert java.lang.String to java.lang.Integer
2018-08-06T10:51:26.106028+00:00 app[web.1]:
2018-08-06T10:51:26.106029+00:00 app[web.1]: Action:
2018-08-06T10:51:26.106030+00:00 app[web.1]:
2018-08-06T10:51:26.106032+00:00 app[web.1]: Update your application's configuration

What should I change in the configuration?

Answer 1

You'll need to create the following entry in your application.properties (or yaml):

server.port=${PORT:8080}

The reason is described in the Docker docs . You can put $ vars in the CMD .

Answer 2

-Dserver.port should be first, like this

CMD [ "sh", "-c", "java -Dserver.port=$PORT -Xmx300m -Xss512k -Dfile.encoding=UTF-8 -Dspring.profiles.active=prod -Djava.security.egd=file:/dev/./urandom -jar /opt/application.jar" ]

Answer 3

The other answers are correct generally speaking, but depending on the environment, (1) it's possible PORT is not defined, and (2) it's possible for the var PORT to get lost somewhere in the translation between host > container > JVM. This is especially the case if you use -Dserver.port instead of --server.port .

For me, what solved this was to default the value in both application.properties and Dockerfile, and to use --server.port instead of -Dserver.port :

// application.properties
server.port=${PORT:8080}

// Dockerfile
CMD ["java", "-jar", "myapp.jar", "--server.port=${PORT:8080}"]