Case Study - Deploy docker image to Heroku

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Prerequisites

First we need to instal heroku-cli

After installing do

heroku login

heroku login:container

to finalize heroku local setup.


Figure 1. successful login

And click Create new app


Figure 2. Heroku create-new-app button

# Take care that `web` is a process name, for web app it needs to be set to 'web'
heroku container:push web -a agh-train-be

IMPORTANT Application needs to use PORT env variable, in kotlin app it can be done with

fun main(args: Array<String>): Unit = io.ktor.server.netty.EngineMain.main(args + "-port=${System.getenv("PORT")}")


Figure 3. Heroku container push logs

Navigate to Heroku app page


Figure 4. Heroku app panel

Click pencil button, switch toggle, and save.


Figure 5. Heroku app panel

If everything is ok we should see app up and running after clicking Open app


Figure 6. Deployed app

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