WildFly System Properties

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Internal

Overview

System properties can be declared in the server's configuration files and are propagated to the server JVMs and implicitly to applications. For more details on how system property can be declared, see Declaration in Configuration Files] below.

Declaration in Configuration Files

Standalone Mode

System properties can be declared in standalone*.xml at the top of the file, conventionally right under the <extensions> element: 

<server ...>
    <extensions>
       ...
    </extensions>

    <system-properties>
        <property name="a.system.property.available.to.the.server.instance" value="some value"/>
    </system-properties>
    ...
</server>

It seems that properties declared this way are not reported in server.log, at least not in EAP 7, under: 

2017-03-27 09:51:02,353 DEBUG [org.jboss.as.config] (MSC service thread 1-6) Configured system properties:
        [Standalone] =
        awt.toolkit = sun.lwawt.macosx.LWCToolkit
        file.encoding = UTF-8
        file.encoding.pkg = sun.io
        ...

Domain Mode

Declaration in domain.xml

Top Level

System properties can be declared in domain.xml at the top of the file, conventionally right under the <extensions> element: 

<domain ...>
    <extensions>
       ...
    </extensions>

    <system-properties>
        <property name="a.system.property.available.across.the.entire.domain" value="some value"/>
    </system-properties>
    ...
</domain>

These properties are available to all server groups, across the entire domain.

Server Group

<domain ...>
    ...
    <server-groups>
        <server-group name="server-group-one" ...>
            <system-properties>
                <property name="a.system.property.available.only.to.server.group.one" value="some value"/>
            </system-properties>
            ...
        </server-group>
    </server-groups>
</domain>

These properties are only available to servers belonging to the server group the property was declared in.

Declaration in host.xml

<host ...>
    <extensions>
       ...
    </extensions>

    <system-properties>
        <property name="a.system.property.available.to.servers.on.this.host" value="some value/>
    </system-properties>
    ...
</domain>

These properties are available to all servers executing on the host, and are not available to servers executed on other hosts.

System Property Reference in Configuration Files

System property references can be specified in such a way that a default value is provided. The default value is provided if the system property is not defined. 

  ...
  <backup>${jboss.messaging.hornetq.backup:false}</backup>
  ...

System Property Reference in Other System Properties

At least as per EAP 7, referring system properties from custom system properties declared in a <system-properties> block does not seem to work reliably: in the best case, properties are not replaced and left in the ${...} form, and in some cases, referring a property generates a configuration error: 

2017-03-21 13:13:51,332 ERROR [org.jboss.as.host.controller] (Controller Boot Thread) WFLYHC0008: Failed to start server (app01): java.lang.IllegalStateException: WFLYCTL0211: Cannot resolve expression 'includes ${a.domain}'
...
Caused by: org.jboss.as.controller.OperationFailedException: WFLYCTL0211: Cannot resolve expression 'includes ${a.domain}' [ "WFLYCTL0211: Cannot resolve expression 'includes ${a.domain}'" ]
        at org.jboss.as.controller.ExpressionResolverImpl.parseAndResolve(ExpressionResolverImpl.java:282)
        at org.jboss.as.controller.ExpressionResolverImpl.resolveExpressionStringRecursively(ExpressionResolverImpl.java:142)
        at org.jboss.as.controller.ExpressionResolverImpl.resolveExpressionsRecursively(ExpressionResolverImpl.java:84)
        at org.jboss.as.controller.ExpressionResolverImpl.resolveExpressions(ExpressionResolverImpl.java:66)

System Property Management with CLI

Manipulating System Properties

System Properties and Standard Paths

WildFly Standard Paths

Standard System Properties

jboss.qualified.host.name

Relevance: WildFly 9

For a host named "ap1.modcluster.local" it is set to "ap1.modcluster.local"

The value of the first segment of this system property will override the <host> element name attribute in host.xml. For more details see host.xml <host> name.

jboss.host.name

Relevance: WildFly 9

For a host named "ap1.modcluster.local" it is set to "ap1".

The value of this system property will override the <host> element name attribute in host.xml. For more details see host.xml <host> name.

jboss.server.name

Relevance: WildFly 9

For a host named "ap1.modcluster.local" it is set to "ap1"

jboss.node.name

Relevance: WildFly 9

Set externally with -Djboss.node.name in the startup script.

Related:

jboss.server.config.dir

Used by:

jboss.bind.address

Represents the value of the instance's public interface. The default value is 127.0.0.1. Also see

Public Interface Configuration

jboss.bind.address for Standalone Node

One common method of externalizing this operationally is to define it as a system property at the bottom of $JBOSS_HOME/bin/standalone.conf: 

...
JAVA_HOME="${JAVA_HOME} -Djboss.bind.address=192.168.1.15"

The same result can be achieved by specifying the system property as a -D argument for the start script: 

./standalone.sh -Djboss.bind.address=192.168.1.10

jboss.bind.address for Host Controller

One common method to externalize the value operationally for host controllers is to define it as a system property at the bottom of $JBOSS_HOME/bin/domain.conf as follows: 

...
HOST_CONTROLLER_JAVA_OPTS="${HOST_CONTROLLER_JAVA_OPTS} -Djboss.bind.address=1.2.3.4"

The value propagates as system property to the process controller, host controller and servers: 

eap 13556 13457 java -D[Process Controller] ... -Djboss.bind.address=1.2.3.4 ...
eap 13595 13556 java -D[Host Controller] ... -Djboss.bind.address=1.2.3.4 ...
eap 13750 13556 /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.79.x86_64/jre/bin/java -D[Server:ri2] ... -Djboss.bind.address=1.2.3.4 ...

Also see

Public Interface Configuration

jboss.bind.address.management

The value of the instance's management interface bind address. The default value is 127.0.0.1.

jboss.bind.address.management for Standalone Node

One common method of externalizing this operationally is to define it as a system property at the bottom of $JBOSS_HOME/bin/standalone.conf: 

...
JAVA_HOME="${JAVA_HOME} -Djboss.bind.address.management=192.168.1.15"

The same result can be achieved by specifying the system property as a -D argument for the start script: 

./standalone.sh -Djboss.bind.address.management=192.168.1.10

jboss.bind.address.management for Host and Domain Controller

One common method to externalize the value operationally for host and domain controllers is to define it as a system property at the bottom of $JBOSS_HOME/bin/domain.conf as follows: 

...
HOST_CONTROLLER_JAVA_OPTS="${HOST_CONTROLLER_JAVA_OPTS} -Djboss.bind.address.management=1.2.3.4"

Note that an attempt to set jboss.bind.address.management in the <system-properties> section of host.xml did not seem to work.

jboss.bind.address.private

The value to bind the "private" interface to. By default 127.0.0.1.

jboss.bind.address.unsecure

The value to bind the "unsecure" interface to. By default 127.0.0.1.

jboss.domain.master.address

The hostname of the domain controller.

It is actually not a good idea to externalize the master domain controller address as a system property. For more explanations see:

Subordinate Host Controller Post-Install

jboss.domain.master.port

The port of the domain controller process.

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