Installation
Concepts
- all Heroku applications run in a collection of lightweight Linux containers called Dynos. To find out the dynos:
heroku ps
- Procfiles can contain additional process types. For example, you can declare a background worker that processes items off a queue.
- The set of dynos declared in your Procfile and managed by the dyno manager via heroku ps:scale are known as the dyno formation. These dynos do the app’s regular business (such as handling web requests and processing background jobs) as it runs. When you wish to do one-off administrative or maintenance tasks for the app, or execute some task periodically using Heroku Scheduler, you can spin up a one-off dyno.
Interface
Config and Environment Variables
- config variables are static and available via
heroku config or via the Heroku Dashboard
- environment variables are dynamic and are available via
heroku run env
Add Ons
Databases
- documentation
- connection information see config var DATABASE_URL [database type]://[username]:[password]@[host]:[port]/[database name]
Postgres
- DB info dashboard -> <APPLICATION> -> Resources
Operation
Delete Application
heroku apps:destroy uweheuer-capstone
List all Applications
heroku apps
List all Domains (for Applications)
heroku domains
Logging
heroku logs --tail
Example
Official Tutorial
PS C:\Temp\python-getting-started> heroku login
- clone example
- create app and push code
- start the app
PS C:\Temp\python-getting-started> heroku ps:scale web=1
Scaling dynos... done, now running web at 1:Free
PS C:\Temp\python-getting-started> heroku open
// opens https://arcane-peak-78109.herokuapp.com/
- open the dashboard
- stop it or scale it down to 0
heroku ps:scale web=0
- prepare for running locally
PS C:\Temp\python-getting-started> python -m venv venv
PS C:\Temp\python-getting-started> .\venv\Scripts\activate
(venv) PS C:\Temp\python-getting-started> pip install -r .\requirements.txt
(venv) PS C:\Temp\python-getting-started> python manage.py collectstatic
(venv) PS C:\Temp\python-getting-started> heroku local -f .\Procfile.windows
Spring Boot
cd C:\Uwes\eclipse\workspace_2020-12\SpringBoot
spring init --dependencies=web demo1 // create a spring app with Spring CLI
cd demo1
- edit
C:\Uwes\eclipse\workspace_2020-12\SpringBoot\demo1\src\main\java\com\example\demo1
git init
git add .
git commit -m "first commit"
heroku login
heroku create // creates an app and a Git remote (named heroku) associated with your local Git repository
- When deploying an app, Heroku reads
pom.xml file and installs the dependencies by running mvn clean install.
- in order to run it locally change java version in
pom.xml from 11 to 8
- create
C:\Uwes\eclipse\workspace_2020-12\SpringBoot\demo1\src\main\java\com\example\demo1\system.properties and add java version 1.8
git add .
git push heroku master
heroku open // opens the application https://intense-caverns-96515.herokuapp.com/ in a browser
heroku addons:create heroku-postgresql // add a PostgrsSQL database
heroku config // shows DB connection URL postgres://cepxizounlueue:e78e393778c5d3e6b5dd26d6ebff081f50d3e5c34a817ec4e8653b1dcf99e91e@ec2-3-230-122-20.compute-1.amazonaws.com:5432/defpfuas3qslld
postgres:
//
cepxizounlueue // username
:
e78e393778c5d3e6b5dd26d6ebff081f50d3e5c34a817ec4e8653b1dcf99e91e // password
@
ec2-3-230-122-20.compute-1.amazonaws.com
:
5432
/
defpfuas3qslld // DB
C:\Uwes\Programme\PostgreSQL\12\bin> .\psql -h ec2-3-230-122-20.compute-1.amazonaws.com -U cepxizounlueue defpfuas3qslld
heroku info // shows basic application information
heroku run env // shows all dynamic environment varialbles
MAVEN_CUSTOM_OPTS ???
Prepare Locally
- create Procfile
Procfile.windows for running locally with command to start the Spring application java -jar target/demo1-0.0.1-SNAPSHOT.jar
- compile and build a JAR, with dependencies, placing it into your application’s target directory. The
spring-boot-maven-plugin in the pom.xml provides this process
mvn install
C:\Uwes\Programme\xampp7.2.27\mysql\bin\mysql --user=root --password=mHalloo0@1m
create database demo1;
- create
C:\Uwes\eclipse\workspace_2020-12\SpringBoot\demo1\set_local_dev.bat
- add profile local_dev to
pom.xml
Run Locally
set_local_dev.bat
// start eclipse by start_eclipse.bat from shell and run it or
heroku local -f Procfile.windows
Resources
