CODEWITHSUNDEEP
dockerherokucontainersdockerfile
lambad
lambad

Reputation: 1066

Unable to get heroku $port in dockerfile

In docker hub, there is a container which when launched opens a port of 9000 by default. The port can be overridden by passing an enviorment variable server__port.

I am trying to pass Heroku $PORT value in the dockerfile as shown below:

ENV server__port=$PORT
EXPOSE $PORT
CMD start.sh

When the start.sh executes, I can see a log where server__port is shown as blank.

If I put a random value of '8889' in the server__port environment variable then in the logs I can see 8889 value assigned to server__port.

I tried to use ARG as shown below, and unfortunately got blank value in server__port variable.

ARG PORT
ENV server__port=$PORT
EXPOSE $PORT
CMD start.sh

How do I get Heroku port value and set in the dockerfile?

Upvotes: 1

Views: 688

Answers (1)

lambad
lambad

Reputation: 1066

Figured it out, I had to export the variable as shown below.

The variable would define the port that would be used by the application. The command is

CMD export CONF_listener__port=$PORT && sh ./start.sh && sh ./startServer.sh -Dclearreports.config="$DEFAULT_CONFIG" -Dsetupautoexecution=true

Upvotes: 1

Related Questions