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Chapter 11. Configuring JBoss Fuse

Abstract

Red Hat JBoss Fuse uses the OSGi Configuration Admin service to manage the configuration of OSGi services. How you feed information to the configuration service depends on how the container is deployed.

11.1. Introducing JBoss Fuse Configuration

OSGi configuration

The OSGi Configuration Admin service specifies the configuration information for deployed services and ensures that the services receive that data when they are active.
A configuration is a list of name-value pairs read from a .cfg file in the InstallDir/etc directory. The file is interpreted using the Java properties file format. The filename is mapped to the persistent identifier (PID) of the service that is to be configured. In OSGi, a PID is used to identify a service across restarts of the container.

Configuration files

You can configure the Red Hat JBoss Fuse runtime using the following files:

Table 11.1. JBoss Fuse Configuration Files

FilenameDescription
broker.xmlConfigures the default Apache ActiveMQ broker in a Fabric (used in combination with the io.fabric8.mq.fabric.server-default.cfg file).
config.propertiesThe main configuration file for the container See Section 11.2, “Setting OSGi Framework and Initial Container Properties” for details.
keys.propertiesLists the users who can access the JBoss Fuse runtime using the SSH key-based protocol. The file's contents take the format username=publicKey,role
org.apache.aries.transaction.cfgConfigures the transaction feature
org.apache.felix.fileinstall-deploy.cfgConfigures a watched directory and polling interval for hot deployment.
org.apache.karaf.features.cfgConfigures a list of feature repositories to be registered and a list of features to be installed when JBoss Fuse starts up for the first time.
org.apache.karaf.features.obr.cfgConfigures the default values for the features OSGi Bundle Resolver (OBR).
org.apache.karaf.jaas.cfgConfigures options for the Karaf JAAS login module. Mainly used for configuring encrypted passwords (disabled by default).
org.apache.karaf.log.cfgConfigures the output of the log console commands. See Section 16.2, “Logging Configuration”.
org.apache.karaf.management.cfg
Configures the JMX system. See Chapter 13, Configuring JMX for details.
org.apache.karaf.shell.cfg
Configures the properties of remote consoles. For more information see Section 8.1, “Configuring a Container for Remote Access”.
io.fabric8.maven.cfgConfigures the Maven repositories used by the Fabric Maven Proxy when downloading artifacts, (The Fabric Maven Proxy is used for provisioning new containers on a remote host.)
io.fabric8.mq.fabric.server-default.cfgConfigures the default Apache ActiveMQ broker in a Fabric (used in combination with the broker.xml file).
org.ops4j.pax.logging.cfg
Configures the logging system. For more, see Section 16.2, “Logging Configuration”.
org.ops4j.pax.url.mvn.cfgConfigures additional URL resolvers.
org.ops4j.pax.web.cfgConfigures the default Jetty container (Web server). See Securing the Web Console.
startup.properties
Specifies which bundles are started in the container and their start-levels. Entries take the format bundle=start-level.
system.properties
Specifies Java system properties. Any properties set in this file are available at runtime using System.getProperties(). See Setting System and Config Properties for more.
users.propertiesLists the users who can access the JBoss Fuse runtime either remotely or via the web console. The file's contents take the format username=password,role
setenv or setenv.batThis file is in the /bin directory. It is used to set JVM options. The file's contents take the format JAVA_MIN_MEM=512M, where 512M is the minimum size of Java memory. See Setting Java Options for more information.

Configuration file naming convention

The file naming convention for configuration files depends on whether the configuration is intended for an OSGi Managed Service or for an OSGi Managed Service factory.
The configuration file for an OSGi Managed Service obeys the following naming convention: 
<PID>.cfg
Where <PID> is the persistent ID of the OSGi Managed Service (as defined in the OSGi Configuration Admin specification). A persistent ID is normally dot-delimited—for example, org.ops4j.pax.web.
The configuration file for an OSGi Managed Service Factory obeys the following naming convention: 
<PID>-<InstanceID>.cfg
Where <PID> is the persistent ID of the OSGi Managed Service Factory. In the case of a managed service factory's <PID>, you can append a hyphen followed by an arbitrary instance ID, <InstanceID>. The managed service factory then creates a unique service instance for each <InstanceID> that it finds.

Setting Java Options

Java Options can be set using the /bin/setenv file in Linux, or the bin/setenv.bat file for Windows. Use this file to directly set a group of Java options: JAVA_MIN_MEM, JAVA_MAX_MEM, JAVA_PERM_MEM, JAVA_MAX_PERM_MEM. Other Java options can be set using the EXTRA_JAVA_OPTS variable.
For example, to allocate minimum memory for the JVM use 
JAVA_MIN_MEM=512M # Minimum memory for the JVM
To set a Java option other than the direct options, use 
EXTRA_JAVA_OPTS="Java option"
For example, 
EXTRA_JAVA_OPTS="-XX:+UseG1GC"