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Buildpack-enabled Options for server.xml

Liberty's server behavior is controlled through a file with the name server.xml.

WAR and EAR Files

If you are pushing a WAR, EAR or "exploded" (i.e. unzipped) file of either type, then a server.xml will be generated for you with the correct parameters for use with Cloud Foundry. That server.xml will look something like this:

<server>
    <featureManager>
        <feature>beanValidation-1.1</feature>
        <feature>cdi-1.2</feature>
        <feature>ejbLite-3.2</feature>
        <feature>el-3.0</feature>
        <feature>jaxrs-2.0</feature>
        <feature>jdbc-4.1</feature>
        <feature>jndi-1.0</feature>
        <feature>jpa-2.1</feature>
        <feature>jsf-2.2</feature>
        <feature>jsonp-1.0</feature>
        <feature>jsp-2.3</feature>
        <feature>managedBeans-1.0</feature>
        <feature>servlet-3.1</feature>
        <feature>websocket-1.1</feature>
    </featureManager>
    <application name='myapp' location='myapp.war' type='war' context-root='/'/>
    <cdi12 enableImplicitBeanArchives='false'/>
    <httpEndpoint id='defaultHttpEndpoint' host='*' httpPort='${port}'/>
    <webContainer trustHostHeaderPort='true' extractHostHeaderPort='true'/>
    <include location='runtime-vars.xml'/>
    <logging logDirectory='${application.log.dir}' consoleLogLevel='INFO'/>
    <httpDispatcher enableWelcomePage='false'/>
    <applicationMonitor dropinsEnabled='false' updateTrigger='mbean'/>
    <config updateTrigger='mbean'/>
</server>

NOTE: The application element will be updated with the type of the application you deployed (war or ear) and the context root for your application. By default, the context root of / is used, unless otherwise set in the WEB-INF/ibm-web-ext.xml file embedded with your application.

If you deployed an application using the command cf push foo, and your domain is mydomain.com, and the application uses the default context root, the application will be accessible from http://foo.mydomain.com/. If the application uses a non-default context root, say /bar, the application will be accessible from http://foo.mydomain.com/bar.

Since you are not pushing a server.xml with your application, you are foregoing most of control over the server's behavior, and the default behavior is assumed. However, you can adjust some things such as the feature list. See the Liberty container for details.

Server Configurations (including a server.xml)

Liberty Directory Push

Another way of deploying your application is to use the ./bin/server package myServer --include=usr command from your Liberty installation in order to package the usr directory of your server. If you run the cf push -p myServer.zip command from the directory containing your packaged server (e.g. /usr/servers/myServer) then that will push the packaged server to the cloud. The buildpack will detect the server.xml contained within the package and proceed to modify it.

You can also use this method to install your own Liberty features. By placing your feature manifest in the ${wlp.user.dir}/extension/lib/features directory and the feature bundle .jar in the ${wlp.user.dir}/extension/lib directory, your feature will be installed to that Liberty instance. When you package Liberty using ./bin/server package myServer --include=usr, those features are also packaged, as they are present in the usr directory. This means that when you push that packaged server, these features will still be present in the usr directory and installed to that instance. More information on Packaging and installing Liberty features can be found here.

Server Directory Push

If you execute cf push from the server directory of your application (e.g. /usr/servers/myServer) then that will push the contents of that directory to the cloud. The buildpack will detect the server.xml in this directory and proceed to modify it.

Invoking the Application

If your push is successful you will be able to invoke your application at the following URL:

http://subdomain.domain/contextRoot/urlPattern

Server.xml Modifications

When a packaged server or a Liberty server directory is pushed, the Liberty buildpack detects the server.xml file along with your application. The Liberty buildpack makes the following modifications to the server.xml file.

  • The buildpack ensures that there is exactly one httpEndpoint element in the file.
  • The buildpack ensures that the httpPort attribute in the httpEndpoint element points to a system variable that is called ${port}.
  • The buildpack ensures that a runtime-vars.xml file is logically merged with your server.xml file. Specifically, the buildpack appends the line <include location="runtime-vars.xml" /> to your server.xml file.

Referenceable Variables

The following variables are defined in the runtime-vars.xml file, and referenced from a pushed server.xml file. All the variables are case-sensitive.

  • ${port}: The http port that the Liberty server is listening on.
  • ${vcap_console_port}: The port where the vcap console is running (usually the same as ${port}).
  • ${vcap_app_port}: The port where the app server is listening (usually the same as ${port}).
  • ${vcap_console_ip}: The IP address of the vcap console (usually the IP address that the Liberty server is listening on).
  • ${application_name}: The name of the application, as defined by using the options in the cf push command.
  • ${application_version}: The version of this instance of the application, which takes the form of a UUID, such as b687ea75-49f0-456e-b69d-e36e8a854caa. This variable changes with each successive push of the application that contains new code or changes to the application artifacts.
  • ${host}: The IP address of the DEA that is running the application (usually the same as ${vcap_console_ip}).
  • ${application_uris}: A JSON-style array of the endpoints that can be used to access this application, for example: myapp.mydomain.com.
  • ${start}: The time and date that the application was started, taking a form similar to 2013-08-22 10:10:18 -0400.

Accessing the Information of Bound Services

The service variables that are accessible from a server.xml file follow the specification that is defined by Cloud Foundry. For more information about the Cloud Foundry specification, see Property placeholders in the Cloud Foundry documentation.

When you want to bind a Cloud Foundry service to your application, information about the service, such as connection credentials, is included in the environment variables that Cloud Foundry sends to the application. These variables are then accessible from the Liberty server configuration file. These variables can be in one of the following forms:

  • cloud.services.<service-name>.<property>, which describes the information such as the name, type, and plan of the service.

  • cloud.services.<service-name>.connection.<property>, which describes the connection information for the service.

The typical set of information is as follows:

  • name: The name of the service. For example, mysql-e3abd.
  • label: The type of the created service. For example mysql-5.5.
  • plan: The service plan, as inidicated by the unique identifier for that plan. For example, 100.
  • connection.name: A unique identifier for the connection, which takes the form of a UUID. For example, d01af3a5fabeb4d45bb321fe114d652ee.
  • connection.hostname: The hostname of the server that is running the service. For example, mysql-server.mydomain.com.
  • connection.host: The IP address of the server that is running the service. For example, 9.37.193.2.
  • connection.port: The port on which the service is listening for incomming connections. For example, 3306, 3307.
  • connection.user: The username that is used to authenticate this application to the service. The username is auto-generated by Cloud Foundry. For example, unHwANpjAG5wT.
  • connection.username: An alias for connection.user.
  • connection.password: The password that is used to authenticate this application to the service. The password is auto-generated by Cloud Foundry. For example, pvyCY0YzX9pu5.

For example, if you create a MySQL service: mysql-321, you can connect to this service with the variable name ${cloud.services.mysql-321.connection.user}.

Example Server.xml for Using Services

The following is an example of a server.xml that was used to connect a Liberty application ("ACE") with Postgresql and MySQL services named jtsql and jtsql2 respectively.

<!-- Enable features -->
    <featureManager>
		<feature>servlet-3.0</feature>
		<feature>sessionDatabase-1.0</feature>
		<feature>jsp-2.2</feature>
	</featureManager>

	<logging traceSpecification="com.ibm.ws.session.*=debug"
		consoleLogLevel="INFO" />

	<httpEndpoint id="defaultHttpEndpoint" host="*" httpPort="${port}" />

	<application name="ace" context-root="/" type="war" id="ace"
		location="ace.war" />

	<dataSource jndiName="jdbc/sessions" id="SessionDS">
		<jdbcDriver libraryRef="PostgreSQLLib" javax.sql.ConnectionPoolDataSource="org.postgresql.ds.PGConnectionPoolDataSource"/>
		<properties user="${cloud.services.jtsql.connection.user}"
			password="${cloud.services.jtsql.connection.password}" databaseName="${cloud.services.jtsql.connection.name}"
			serverName="${cloud.services.jtsql.connection.host}" portNumber="${cloud.services.jtsql.connection.port}" />
	</dataSource>

	<dataSource jndiName="jdbc/sessions2" id="SessionDS2">
		<jdbcDriver libraryRef="MySQLLib" />
		<properties user="${cloud.services.jtsql2.connection.user}"
			password="${cloud.services.jtsql2.connection.password}" databaseName="${cloud.services.jtsql2.connection.name}"
			serverName="${cloud.services.jtsql2.connection.host}" portNumber="${cloud.services.jtsql2.connection.port}" />
	</dataSource>

	<library id="PostgreSQLLib">
		<fileset dir="${server.config.dir}/lib" includes="postgresql-*.jar" />
	</library>

	<library id="MySQLLib" name="MySQL JDBC Drivers">
		<fileset dir="${server.config.dir}/lib" includes="mysql-connector-java-*.jar" />
	</library>

</server>
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