How to use environment variables in WildFly configuration (standalone.xml or host.xml)

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Passing environment variables to WildFly or JBoss AS has been traditionally an issue which has been often solved turning the environment variables into Java System Properties. For example:

$ export LOGPATH=/home/jboss/log

$ ./standalone.sh -DlogPath=LOGPATH

 Later on you could use the System Property with a standard Bean Shell expression, as in this example:

<appender name="FILE" class="org.jboss.logging.appender.RollingFileAppender">
 <param name="File" value="${logPath}/server.log"/>
   . . . .  
</appender>

 Luckily there is an easier step which allows us to use directly our environment variables, without turning them into System Properties: just use the env pattern in the Bean Shell expression. See the following example:

<appender name="FILE" class="org.jboss.logging.appender.RollingFileAppender">
 <param name="File" value="${env.LOGPATH}/server.log"/>
   . . . .  
</appender>

 The env pattern is quite flexible, as you can use it in conjunction with System Properties and a default fall back expression. See the following example:

<interface name="public">
    <inet-address value="${jboss.bind.address,env.HOST:192.168.10.1}"/>
</interface>

In the above example, at first the Java system property jboss.bind.address is evaluated and, if included, used. Otherwise the env.HOST Environment variable is checked. If none is used, the interface is assigned the fallback expression 192.168.10.1

 

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