In this post you will learn how to use a micro framework called Spark to build a RESTful backend. The RESTful backend is consumed by a single page web application using AngularJS and MongoDB for data storage. I’ll also show you how to run Java 8 on OpenShift. Read the full blog here https://www.openshift.com/blogs/developing-single-page-web-applications-using-java-8-spark-mongodb-and-angularjs
OpenShift is an auto-scalable Platform as a Service. Auto-scalable means OpenShift can horizontally scale your application up or down depending on the number of concurrent connections. OpenShift supports the JBoss application server, which is a certified platform for Java EE 6 development. As an OpenShift user, you have access to both the community version of JBoss and JBoss EAP 6(JBoss Enterprise Application Platform) for free. In this blog post, we will learn how to host a scalable Java EE 6 application using a JBoss EAP 6 server cluster running on OpenShift. Read the full blog here https://www.openshift.com/blogs/how-to-host-your-java-ee-application-with-auto-scaling
Yes, you can run Grails applications on OpenShift. Follow the steps mentioned below to deploy Grails apps via Jenkins on OpenShift.
Step 1 : Create Tomcat 7 application with Jenkins
$ rhc app-create grailsapp tomcat-7 --enable-jenkins
Step 2 : Delete template code
$ cd grailsapp $ git rm -rf src/ pom.xml $ git commit -am "deleted template code"
Step 3: Generate Grails app
Use grails command line or IDE to generate a Grails project.
Step 4: Copy the Grails app
Copy the source code of your grails app in the grailsapp folder. The grailsapp corresponds to OpenShift application.
Step 5: Create pre_build action hook
Create an OpenShift action hook
touch .openshift/action_hooks/pre_build chmod +x .openshift/action_hooks/pre_build
Copy the following in pre_build hook
#!/bin/bash # This is a simple script and will be executed on your CI system if # available. Otherwise it will execute while your application is stopped # before the build step. This script gets executed directly, so it # could be python, php, ruby, etc. set -x if [ ! -d $OPENSHIFT_DATA_DIR/grails-2.3.4 ] then mkdir $OPENSHIFT_DATA_DIR/.grails cd $OPENSHIFT_DATA_DIR wget http://dist.springframework.org.s3.amazonaws.com/release/GRAILS/grails-2.3.4.zip unzip grails-2.3.4.zip rm -f grails-2.3.4.zip fi
Step 6: Create build action hook
Create an OpenShift action hook
touch .openshift/action_hooks/build chmod +x .openshift/action_hooks/build
Copy the following in build hook
#!/bin/bash # This is a simple script and will be executed on your CI system if # available. Otherwise it will execute while your application is stopped # before the build step. This script gets executed directly, so it # could be python, php, ruby, etc. set -x export GRAILS_HOME=$OPENSHIFT_DATA_DIR/grails-2.3.4 export PATH=$GRAILS_HOME/bin:$PATH cd $OPENSHIFT_REPO_DIR export GRAILS_OPTS="-Xmx512m -Xms256m -XX:MaxPermSize=256m" grails -Dgrails.work.dir=$OPENSHIFT_DATA_DIR.grails prod war
Step 7: Commit and push the changes
Commit and push the changes
$ git add . $ git commit -am "app" $ git push
Now watch your Jenkins build. If it fails, I guess it would be because of memory issues. Try and use bigger gear sizes. Grails is memory hungry.
Github repository with sample app code https://github.com/shekhargulati/grails-jenkins-openshift-example
You can read full blog here https://www.openshift.com/blogs/build-your-app-on-openshift-using-flask-sqlalchemy-and-postgresql-92
OpenShift already has best in class Java support with Tomcat 6, Tomcat 7, JBoss AS7, and JBoss EAP 6 bundled with it. You can also run Jetty or GlassFish on it using the DIY cartridges. In addition, OpenShift provides support for Jenkins continuous integration server.