JarCastingrouplex-deployment-service
This repo provides various components such as java libraries, web resources and a web service / application that can be used for host deployment and management in public clouds such as Amazon EC2, Google Cloud, Azure.
The deployment service can deploy clusters of hosts, maintain leases of thereof, replenish the clusters depending on their load indicators (coming soon), or destroy them on command, or if they expire. Various configurations are available on a cluster level, where the deployment service can be taking out or replace hosts that fail reporting their state for example.
This first implementation provides the basic functionality and is not high availability. Requests are fulfilled by a single running instance, and all could be lost if that instance goes down for some reason. The upcoming implementation is addressing this as well as high availability via the use of (SWF) workflows.
Description
This project is managed using maven and is composed of a few modules which follow the Rouplex model.
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For each sub-service, there is a module containing the service definition expressed as a java interface and related POJOs/DTOs. This module is suffixed by "-api" and includes minimal dependencies (using only jax-rs-annotations) for pain-free dependency management on the client side. The build artifact is a slim jar that will be used by both a client and a provider of the service. We try to model our services as REST, in which case we add the appropriate annotations for the client/server adapters to take advantage of. One of these modules is rouplex-deployment-service-api.
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The related implementation is found in a module of same name suffixed with "-provider". This module will produce a jar which can be used as a component of a bigger deployment. In our example, rouplex-deployment-service-provider would be the corresponding module.
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The library obtained at (2) is also provided as a web resource ready for inclusion in a web app. This module will produce a jar including various jersey dependencies. In our example, rouplex-deployment-service-provider-jersey would be the corresponding module.
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The resource obtained at (3) (normally along others), is then included in a web app. This module will produce a war file ready for deployment in application servers. In our example, rouplex-deployment-webapp would be the corresponding module.
Versioning
We use semantic versioning, in its representation x.y.z, x stands for API update, y for dependencies update, and z for build number.
Build
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Java 8 is required to build the project. Make sure the installation is successful by typing
java -versionon a shell window; the command output should show the version. -
Maven is required to build the project. Make sure the installation is successful by typing
mvn -versionon a shell window; the command output should be showing the installation folder. -
On a shell window, and from the folder containing this README file, type
mvn clean installand if successful, you will have the built artifacts in appropriate 'target' folders located under the appropriate modules. The same jars will be installed in your local maven repo.
Test
mvn test will execute all the tests and the console output should show success upon finishing.
Run
To run locally and mostly for debugging purposes, type cd rouplex-deployment-webapp; mvn tomcat7:run on a shell window to start the server. Then type mvn exec:java on a separate window to start a browser client (pointing at http://localhost:8080/webjars/swagger-ui/2.2.5/index.html?url=http://localhost:8080/rest/swagger.json) Refer to the API section for details on requests and related responses.
Deploy
To deploy and run remotely on an App server you must make sure you follow these steps:
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Java8 will be needed to run the deployment service on your host(s). You can get it via
wget --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u102-b14/jdk-8u102-linux-x64.rpm; sudo yum localinstall jdk-8u102-linux-x64.rpm -
An application container is required to run the service. You can download tomcat if none is available on your host.
wget http://archive.apache.org/dist/tomcat/tomcat-8/v8.5.12/bin/apache-tomcat-8.5.12.tar.gz; tar -xvf apache-tomcat-8.5.12.tar.gz -
A server key and certificate is required to run the test servers. You can create your own or you can copy the keystore at rouplex-deployment-service/rouplex-deployment-webapp/src/test/resources/server-keystore somewhere on your host. Let say you copied it on $TOMCAT_HOME/conf/server-keystore. The keystore password is "kotplot" without the quotes.
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The test servers must be configured to find the geoLocation of the keystore. That can be done by editing (or creating) $TOMCAT_HOME/bin/setenv.sh file to add the line containing the system properties used by JVM for this purpose
export JAVA_OPTS="-Djavax.net.ssl.keyStore=$TOMCAT_HOME/conf/server-keystore -Djavax.net.ssl.keyStorePassword=kotplot" -
The application container must be started ($TOMCAT_HOME/catalina.sh start is one way of doing it) for a dynamic deployment (or one can opt for a static deployment, equivalent, but out of the scope of this guide)
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You must now deploy the deployment service to the application container. Point your browser at
http://domain.com:8080/manager/htmland you should see the tomcat manager page.
- If you get permission denied, it is because your manager by default is configured to allow only local connections. You can override that behaviour by editting manager's config
vi $TOMCAT_HOME/webapps/manager/META-INF/context.xmland lifting the restriction by commenting out the valve, or restrict to your public ip address (not shown).
<Context antiResourceLocking="false" privileged="true" >
<!-- <Valve className="org.apache.catalina.valves.RemoteAddrValve" allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" /> -->
</Context>
- The role, username and password for the admin are set via
vi $TOMCAT_HOME/conf/tomcat-users.xml. Make sure you have something like
<tomcat-users>
<role rolename="manager-gui"/>
<user username="tomcat" password="<password>" roles="manager-gui"/>
</tomcat-users>
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Deploy the deployment service by uploading it in tomcat via deploy button (context path will be: "/" with no quotes).
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Use the browser to get to url (http://domain.com:8080/webjars/swagger-ui/2.2.5/index.html?url=http://domain.com:8080/rest/swagger.json)
Contribution guidelines
- Writing tests
- Code review
- Other guidelines
Who do I talk to?
- Repo owner or admin [email protected]
