Custom Environment Variables for Java Application Servers
Environment variables represent a kind of placeholders, where you can store the frequently used parameters’ values or strings in order not to specify them manually in the code each time they are needed. There is a number of default environment variables which are preconfigured at CirrusGrid application servers and can be easily integrated into your app, hosted within these servers, to make your work with CirrusGrid Cloud even more convenient.
The following guide will acquaint you with the details on how to add your custom environment variables to particular Java application servers:
Note that the same operations can be done by means of establishing the SSH connection to any of your servers and declaring variables in the corresponding configuration file via console.
The following workflow is pretty simple and identical for the majority of supported Java application servers, so let’s check it out first.
1. Click the Config button for your application server (Tomcat, TomEE or Jetty).
2. In the opened tab, navigate to the /opt/tomcat/conf directory and choose the variables.conf file within it. There you’ll see a short instruction on setting your custom environment variables.
Follow it, by means of adding the desired custom variables here. Each variable should be either separated by a space from the next one or started from a new line.
For example:-Dvar1=value1 -Dvar2=value2
Note: you can also set JVM options in this file. As an example, you can see the Garbage Collection agent option declared just above the circled area at the image.
Do not forget to Save the configurations you’ve made.
3. Then make the appropriate changes in your application’s code with the help of the System.getProperty(“your_variable”) method to appoint the specified values to the needed arguments.For example:String var1 = System.getProperty(“var1“);String var2 = System.getProperty(“var2“);String var3 = System.getProperty(“var3“)
4. Once this is completed, Restart your application server using the corresponding button next to it.
As a result, all the newly stated configurations will be applied.
For Glassfish, variables configuration is performed through its Administration Console, so the process will be the following:
1. Click the last button (with gear icon) for GlassFish in your environment and choose Admin panel > Login in the appeared list (or follow the link to the Admin console which you’ve received via email after environment creation).
2. Fill in the Username and Password fields with the credentials from the same email received earlier.
3. Once inside, choose the gfcluster-config > JVM Settings option within the Configuration’s section at the left-hand menu list.
4. Then select the JVM Options tab and click on the Add JVM Option button above the Options list. A new empty field will appear at the top of the list, wherein you can enter your custom environment variable (e.g. -Dvar1=value1).If you’d like to call a JAR file as the option’s argument, just upload it to the home folder of your GlassFish server and specify the path to it for the desired option, for example:-javaagent:/opt/glassfish3/temp/newrelic.jarAfter all the desired parameters are set, click the Save button.
5. If everything is OK, you’ll get the next message:
6. Finally, switch back to your Jelastic dashboard and restart GlassFish using the corresponding button.
That’s all. In such a way, you can manage GlassFish environment variables through the Admin Console.
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