Java-User-Group Saxony 31.03.2017
This repository contains code-examples how to use docker in combination with jenkins, maven and selenium.
- please install docker-machine to get a running docker- and docker-compose-version
- install docker- and docker-compose here or use your package-manager
You need the ci-system jenkins with a full stack of plugins quickly? So you can use docker to automate the difficult installation-process of a complex ci-system. You only need these two commands to start your own jenkins:
docker build . -t jenkins-image
docker run --name jenkins-container -p 8080:8080 jenkins-image
This docker image builds upon the vanilla Jenkins image (https://hub.docker.com/_/jenkins/)
As well as the vanilla jenkins images, Maven3 is pre-installed.
It also ensures that the following plugins (along with dependencies) are pre-installed:
- Git v2.4.1 (https://wiki.jenkins-ci.org/display/JENKINS/Git+Plugin)
- Build pipeline v1.4.9 (https://wiki.jenkins-ci.org/display/JENKINS/Build+Pipeline+Plugin)
- Cloudbees Docker Build and Publish v1.1 (https://wiki.jenkins-ci.org/display/JENKINS/CloudBees+Docker+Build+and+Publish+plugin)
Finally it pre-configures the Jenkins instance with knowledge of the Maven installation directory and Docker executable.
If you want to test your web-application professionally you should use selenium.
Selenium automates browser-testing, this is important to save time in development. The only problem with selenium is the time you need to install and configure the services.
Docker solves this problem too. Install easily a stack of services: your jenkins, selenium-hub, two nodes and a mysql db with the given docker-compose.yml (/demo2/docker-compose.yml) file and these commands:
docker-compose up
then configure a maven-jenkins-job on localhost:8080 with:
mvn package -Dselenium_host=<ip-hub-container>:4444
As target you can use this repository, because there are simple selenium test-cases given (title check from selenium-hub).
If you want to interact with your mysql-db simply use:
docker exec -it demo2_db_1 sh -c 'mysql -u root -p admin'
Change your data quickly with the given dump.sql files in the data folder. These folder is mounted into the db-container (and imported into the db on start-up) with:
volumes:
- ../data/:/docker-entrypoint-initdb.d/
- try to use docker in combination with maven and jenkins to define a continuous integration / continuous delivery pipeline
- this is possible because of the docker-maven-plugin (builds docker-images in maven-lifecycle)
- use this images to deploy your applications into different containers
- after your applications are build, they will be deployed and available
- scale the number of containers per service with
docker-compose scale - use isolated containers to develop in different staging layers