Suggested syntax in Dockerfile for $PORT?

Question

Suggested syntax in Dockerfile for $PORT?

charlesdwright opened this issue 3 years ago · 6 comments

Perhaps the documentation can show an example of how to create a new image allowing for a $PORT environment var using this one.

Answer 1 · 2021-05-26T13:03:16.000Z

Just curious, what's this?

    <init-param>
      <param-name>expires</param-name>
      <param-value>666</param-value>
    </init-param>

Answer 2 · 2021-05-26T17:30:49.000Z

#169 (comment)

it requires modification of XML configuration to change the port -- we currently do not do anything to the default XML configuration provided by Tomcat upstream, and we don't have any plans to do so.

And that snippet looks like an ssl expiry parameter

Answer 3 · 2021-05-26T17:41:25.000Z

Thank you for responding and helping support the Tomcat image. Am trying to figure out how to set the port by Env variable. Are you aware of a tutorial or discussion you can point me to? Also, the expiry parm just happens to be the Mark of The Beast (666)! Regards, C

…

On May 26, 2021, at 1:31 PM, wglambert ***@***.***> wrote: #169 (comment) <#169 (comment)> it requires modification of XML configuration to change the port -- we currently do not do anything to the default XML configuration provided by Tomcat upstream, and we don't have any plans to do so. And that snippet looks like an ssl expiry parameter — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#228 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ARAJCFCRB7ZKVEWA4RZ6KV3TPUV5VANCNFSM45R5ECSQ>.

Answer 4 · 2021-05-26T18:06:00.000Z

You would need to provide a modified server.xml that can substitute the value for the environment variable
https://stackoverflow.com/a/15556920

It seems unnecessary when you can just have Docker forward whichever port you want to the container (which is listening on port 8080 by default)
https://docs.docker.com/config/containers/container-networking/#published-ports
https://github.com/docker-library/docs/tree/master/tomcat#how-to-use-this-image

You could also try asking over at the Docker Community Forums, Docker Community Slack, or Stack Overflow. Since these repos aren't really a user-help forum

Answer 5 · 2021-05-26T18:08:37.000Z

Agree it does seem unnecessary. But it’s an issue for Heroku which assigns a port at runtime. There are workarounds, (ie web runner) but I think solving it will help my understanding of Docker. Thank you again and Regards… C

…

On May 26, 2021, at 2:06 PM, wglambert ***@***.***> wrote: You would need to provide a modified server.xml that can substitute the value for the environment variable https://stackoverflow.com/a/15556920 <https://stackoverflow.com/a/15556920> It seems unnecessary when you can just have Docker forward whichever port you want to the container (which is listening on port 8080 by default) https://docs.docker.com/config/containers/container-networking/#published-ports <https://docs.docker.com/config/containers/container-networking/#published-ports> https://github.com/docker-library/docs/tree/master/tomcat#how-to-use-this-image <https://github.com/docker-library/docs/tree/master/tomcat#how-to-use-this-image> You could also try asking over at the Docker Community Forums <https://forums.docker.com/>, Docker Community Slack <https://dockr.ly/slack>, or Stack Overflow <https://stackoverflow.com/search?tab=newest&q=docker>. Since these repos aren't really a user-help forum — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#228 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ARAJCFGLJQDRICHGP7SDQ7TTPU2BTANCNFSM45R5ECSQ>.

Answer 6 · 2022-10-11T07:05:13.000Z

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