devopsglobalsolutions/petclinic-spinnaker-jenkins

Spring Petclinic Application - CI/CD Pipeline using Spinnaker and Jenkins

Spring PetClinic Sample Application

Understanding the Spring Petclinic application with a few diagrams

Running petclinic locally

Petclinic is a Spring Boot application built using Maven. You can build a jar file and run it from the command line:

git clone https://github.com/spring-projects/spring-petclinic.git
cd spring-petclinic
./mvnw package
java -jar target/*.jar

You can then access petclinic here: http://localhost:8080/

Or you can run it from Maven directly using the Spring Boot Maven plugin. If you do this it will pick up changes that you make in the project immediately (changes to Java source files require a compile as well - most people use an IDE for this):

./mvnw spring-boot:run

In case you find a bug/suggested improvement for Spring Petclinic

Our issue tracker is available here: https://github.com/spring-projects/spring-petclinic/issues

Database configuration

In its default configuration, Petclinic uses an in-memory database (HSQLDB) which gets populated at startup with data. A similar setup is provided for MySql in case a persistent database configuration is needed. Note that whenever the database type is changed, the app needs to be run with a different profile: spring.profiles.active=mysql for MySql.

You could start MySql locally with whatever installer works for your OS, or with docker:

docker run -e MYSQL_ROOT_PASSWORD=petclinic -e MYSQL_DATABASE=petclinic -p 3306:3306 mysql:5.7.8
docker exec -it mysql bash
mysql -uroot -p

Create the DB schema and the database tables by running the scirpts inside the initDB.sql and populateDB.sql files

Create a jar file under target directory:

mvn package -DskipTests=true

Run the application using mysql profile

java -Dspring.profiles.active=mysql -jar target\spring-petclinic-2.0.0.jar

Run the application using hsqldb profile

java -Dspring.profiles.active=hsqldb -jar target\spring-petclinic-2.0.0.jar

Running Petclinic using Docker

Inside the Dockerfile, create the last line as:

ENTRYPOINT [ "sh", "-c", "java -Dspring.profiles.active=${ENV} -Djava.security.egd=file:/dev/./urandom -jar /app.jar" ]

Create a docker image and push it to the Docker Hub

And while running the docker:

docker run --env ENV=mysql -d -p 8080:8080 <image id> 

This way, environment variable gets local as value and passes to Dockerfile when we bring up a container.

You can also pass on the Spring Profile as an environment variable at the run time as:

$ docker run -e "SPRING_PROFILES_ACTIVE=prod" -p 8080:8080 -t ibuchh/spring-petclinic

Petclinic environment variables

https://stackoverflow.com/questions/51655725/how-can-i-set-spring-boot-properties-from-docker-run-command?noredirect=1&lq=1

http://www.littlebigextra.com/use-spring-profiles-docker-containers/

https://www.mkyong.com/spring-boot/spring-boot-profile-based-properties-and-yaml-example/

https://dzone.com/articles/spring-boot-profiles-1

Working with Petclinic in your IDE

Prerequisites

The following items should be installed in your system:

• Java 8 or newer.
• git command line tool (https://help.github.com/articles/set-up-git)
• Your prefered IDE
  • Eclipse with the m2e plugin. Note: when m2e is available, there is an m2 icon in Help -> About dialog. If m2e is not there, just follow the install process here: http://www.eclipse.org/m2e/
  • Spring Tools Suite (STS)
  • IntelliJ IDEA

Steps:

1. On the command line ``` git clone https://github.com/spring-projects/spring-petclinic.git ```
2. Inside Eclipse or STS

File -> Import -> Maven -> Existing Maven project

Then either build on the command line ./mvnw generate-resources or using the Eclipse launcher (right click on project and Run As -> Maven install) to generate the css. Run the application main method by right clicking on it and choosing Run As -> Java Application.

3. Inside IntelliJ IDEA

In the main menu, choose File -> Open and select the Petclinic pom.xml. Click on the Open button.

CSS files are generated from the Maven build. You can either build them on the command line ./mvnw generate-resources or right click on the spring-petclinic project then Maven -> Generates sources and Update Folders.

A run configuration named PetClinicApplication should have been created for you if you're using a recent Ultimate version. Otherwise, run the application by right clicking on the PetClinicApplication main class and choosing Run 'PetClinicApplication'.

4. Navigate to Petclinic

Visit http://localhost:8080 in your browser.