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href="#_monitoring_and_management_using_jmx">Monitoring and Management using JMX</a></li> +</ul> +</div> +</div> +<div id="content"> +<div class="sect2"> +<h3 id="_monitoring_and_management_using_jmx">Monitoring and Management using JMX</h3> +<div class="paragraph"> +<p>Apache Karaf provides a complete JMX layer.</p> +</div> +<div class="paragraph"> +<p>You can remotely connect to a running Apache Karaf instance using any JMX client (like jconsole).</p> +</div> +<div class="paragraph"> +<p>The Apache Karaf features provide a set of MBeans, dedicating for the monitoring and management.</p> +</div> +<div class="sect3"> +<h4 id="_connecting">Connecting</h4> +<div class="paragraph"> +<p>Apache Karaf exposes a complete MBean server that you can use remotely.</p> +</div> +<div class="paragraph"> +<p>The default port number is 1099.</p> +</div> +<div class="paragraph"> +<p>The JMX URL to use by default is:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>service:jmx:rmi:///jndi/rmi://localhost:1099/karaf-root</pre> +</div> +</div> +<div class="paragraph"> +<p>If don’t need the remote JMX at all, users can remove</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>-Dcom.sun.management.jmxremote</pre> +</div> +</div> +<div class="paragraph"> +<p>from bin/karaf|bin/karaf.bat to avoid opening the RMI listening port.</p> +</div> +<div class="paragraph"> +<p>You have to provide an username and password to access to the JMX layer. +The JMX layer user the security framework, and so, by default, it uses the users defined in <code>etc/users.properties</code>.</p> +</div> +<div class="paragraph"> +<p>You can change the port numbers of the JMX layer in the <code>etc/org.apache.karaf.management.cfg</code> configuration file.</p> +</div> +</div> +<div class="sect3"> +<h4 id="_configuration">Configuration</h4> +<div class="paragraph"> +<p>The Apache Karaf JMX management layer is configured in the <code>etc/org.apache.karaf.management.cfg</code> configuration file:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>################################################################################ +# +# Licensed to the Apache Software Foundation (ASF) under one or more +# contributor license agreements. See the NOTICE file distributed with +# this work for additional information regarding copyright ownership. +# The ASF licenses this file to You under the Apache License, Version 2.0 +# (the "License"); you may not use this file except in compliance with +# the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# +################################################################################ + +# +# The properties in this file define the configuration of Apache Karaf's JMX Management +# + +# +# Port number for RMI registry connection +# +rmiRegistryPort = 1099 + +# +# Port number for RMI server connection +# +rmiServerPort = 44444 + +# +# Name of the JAAS realm used for authentication +# +jmxRealm = karaf + +# +# The service URL for the JMXConnectorServer +# +serviceUrl = service:jmx:rmi://0.0.0.0:${rmiServerPort}/jndi/rmi://0.0.0.0:${rmiRegistryPort}/karaf-${karaf.name} + +# +# Whether any threads started for the JMXConnectorServer should be started as daemon threads +# +daemon = true + +# +# Whether the JMXConnectorServer should be started in a separate thread +# +threaded = true + +# +# The ObjectName used to register the JMXConnectorServer +# +objectName = connector:name=rmi + +# +# Role name used for JMX access authorization +# If not set, this defaults to the ${karaf.admin.role} configured in etc/system.properties +# +# jmxRole=admin</pre> +</div> +</div> +<div class="ulist"> +<ul> +<li> +<p><code>rmiRegistryPort</code> property contains the port number of the JMX RMI registry. Default is <code>1099</code>.</p> +</li> +<li> +<p><code>rmiServerPort</code> property contains the port number of the JMX RMI server. Default is <code>44444</code>.</p> +</li> +<li> +<p><code>jmxRealm</code> is the security realm to use as authentication backend. By default it uses the <code>karaf</code> realm.</p> +</li> +</ul> +</div> +</div> +<div class="sect3"> +<h4 id="_mbeans">MBeans</h4> +<div class="paragraph"> +<p>Apache Karaf provides a bunch of MBeans.</p> +</div> +<div class="paragraph"> +<p>The MBeans object names have the same format:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>org.apache.karaf:type=[feature],name=[instance]</pre> +</div> +</div> +<div class="paragraph"> +<p>Installing additional Apache Karaf features and external applications can provide new MBeans.</p> +</div> +<div class="paragraph"> +<p>The following MBeans list is non exhaustive:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p><code>org.apache.karaf:type=bundle,name=*</code>: management of the OSGi bundles.</p> +</li> +<li> +<p><code>org.apache.karaf:type=config,name=*</code>: management of the configurations.</p> +</li> +<li> +<p><code>org.apache.karaf:type=diagnostic,name=*</code>: creation of dumps containing the current Apache Karaf activity (used for diagnostic).</p> +</li> +<li> +<p><code>org.apache.karaf:type=feature,name=*</code>: management of the Apache Karaf features.</p> +</li> +<li> +<p><code>org.apache.karaf:type=http,name=*</code>: management of the HTTP service (provided by the <code>http</code> feature).</p> +</li> +<li> +<p><code>org.apache.karaf:type=instance,name=*</code>: management of the instances.</p> +</li> +<li> +<p><code>org.apache.karaf:type=jdbc,name=*</code>: management of the JDBC service (provided by the <code>jdbc</code> feature).</p> +</li> +<li> +<p><code>org.apache.karaf:type=jms,name=*</code>: management of the JMS service (provided by the <code>jms</code> feature).</p> +</li> +<li> +<p><code>org.apache.karaf:type=jndi,name=*</code>: management of the JNDI service (provided by the <code>jndi</code> feature).</p> +</li> +<li> +<p><code>org.apache.karaf:type=kar,name=*</code>: management of the KAR file.</p> +</li> +<li> +<p><code>org.apache.karaf:type=log,name=*</code>: management of the log service.</p> +</li> +<li> +<p><code>org.apache.karaf:type=obr,name=*</code>: management of the OBR service (provided by the <code>obr</code> feature).</p> +</li> +<li> +<p><code>org.apache.karaf:type=package,name=*</code>: details about packages exported/imported.</p> +</li> +<li> +<p><code>org.apache.karaf:type=service,name=*</code>: management of the OSGi services.</p> +</li> +<li> +<p><code>org.apache.karaf:type=system,name=*</code>: management of the Apache Karaf container itself (halt, restart, etc).</p> +</li> +<li> +<p><code>org.apache.karaf:type=web,name=*</code>: management of WebApplications (provided by the <code>war</code> feature).</p> +</li> +<li> +<p><code>org.apache.karaf:type=wrapper,name=*</code>: management of the service wrapper (provided by the <code>wrapper</code> feature).</p> +</li> +</ul> +</div> +</div> +<div class="sect3"> +<h4 id="_rbac">RBAC</h4> +<div class="paragraph"> +<p>Apache Karaf provides a complete Role-Based Access Control to the JMX MBeans and operations.</p> +</div> +<div class="paragraph"> +<p>Whenever a JMX operation is invoked, the roles of the user are checked against the required roles for this operation.</p> +</div> +<div class="paragraph"> +<p>The access lists are defined in configuration file in the <code>etc</code> folder.</p> +</div> +<div class="paragraph"> +<p>The relevant configuration is prefixed with <code>jmx.acl</code> and based on the JMX ObjectName that it applies to.</p> +</div> +<div class="paragraph"> +<p>For instance, specific configuration for a MBean with the object name <code>foo.bar:type=Test</code> can be placed in the +<code>etc/jmx.acl.foo.bar.Test.cfg</code> configuration file.</p> +</div> +<div class="paragraph"> +<p>More generic configurations can be placed in the domain (e.g. jmx.acl.foo.bar.cfg) or at the top level (jmx.acl.cfg).</p> +</div> +<div class="paragraph"> +<p>A simple configuration file looks like:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre> # operation = role + test = admin + getVal = manager, viewer</pre> +</div> +</div> +<div class="paragraph"> +<p>Apache Karaf looks for required roles using the following process +. +The most specific configuration file is tried first. It means that in the previous example, the <code>etc/jmx.acl.foo.bar.Test.cfg</code> is looked at first. +In this configuration, Apache Karaf looks for a:</p> +</div> +<div class="olist arabic"> +<ol class="arabic"> +<li> +<p>Specific match for the invocation, e.g. <code>test(int)["17"] = role1</code></p> +</li> +<li> +<p>Regex match for the invocation, e.g. <code>test(int)[/[0-9]/] = role2</code> +In both cases, the passed argument is converted to a String for the comparison. +If any of the above match, the search stops and the associated roles are used.</p> +</li> +<li> +<p>Signature match for the invocation, e.g. <code>test(int) = role3</code> +If matched, the search stops and the associated roles are used.</p> +</li> +<li> +<p>Method name match for the invocation, e.g. <code>test = role4</code> +If matched, the search stops and the associated roles are used.</p> +</li> +<li> +<p>A method name wildcard match, e.g. <code>te* = role5</code> +For all the wildcard matches found in the current configuration file, the roles associated with the longest match are used. +So if you have te* and * and the method invoked is 'test', then the roles defined with te* are used, not the ones defined with *.</p> +</li> +</ol> +</div> +<div class="paragraph"> +<p>If no matching definition is found, the most specific definition always takes the precedence.</p> +</div> +<div class="paragraph"> +<p>You can find some configuration examples:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>Only a <code>manager</code> can call GC on the Memory MBean:</p> +</li> +</ul> +</div> +<div class="listingblock"> +<div class="content"> +<pre># etc/jmx.acl.java.lang.Memory.cfg + gc = manager</pre> +</div> +</div> +<div class="ulist"> +<ul> +<li> +<p>Bundles with ID between 0 and 49 can be stopped only by an <code>admin</code>, other bundles can be stopped by a <code>manager</code>:</p> +</li> +</ul> +</div> +<div class="listingblock"> +<div class="content"> +<pre># etc/jmx.acl.org.apache.karaf.bundles.cfg + stop(java.lang.String)[/([1-4])?([0-9]/] = admin + stop = manager</pre> +</div> +</div> +<div class="paragraph"> +<p>The <code>etc/jmx.acl.cfg</code> configuration file contains the global configuration for the invocation on any MBean that +doesn’t have a specific configuration:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre># etc/jmx.acl.cfg + list* = viewer + get* = viewer + is* = viewer + set* = admin + * = admin</pre> +</div> +</div> +<div class="paragraph"> +<p>By default, all "read-only" operations (<code>list*</code>, <code>get*</code>, <code>is*</code>) can be performed by a <code>viewer</code>, whereas the "read-write" operations can be performed only by an <code>admin</code>.</p> +</div> +<div class="paragraph"> +<p>The <code>org.apache.karaf:type=security,area=jmx</code> MBean can be used to check whether the current user can access a certain MBean or invoke a specific operation on it. +This MBean can be used by management clients (monitoring tools, etc) to decide whether to show certain MBeans or operations to the end user.</p> +</div> +</div> +<div class="sect3"> +<h4 id="_jmx_http_bridge_with_jolokia">JMX-HTTP bridge with Jolokia</h4> +<div class="paragraph"> +<p>It’s not always easy to use a JMX client with the RMI protocol.</p> +</div> +<div class="paragraph"> +<p>Some monitoring tools (Nagios, Zabbix, …​) are not native JMX clients.</p> +</div> +<div class="paragraph"> +<p>But most of them can use HTTP.</p> +</div> +<div class="paragraph"> +<p>More over, you may want to write your own application/web application. In that case, HTTP and JSON can be very interesting and easy to remotely manage Apache Karaf.</p> +</div> +<div class="paragraph"> +<p><a href="http://www.jolokia.org/";>Jolokia</a> can be installed in Apache Karaf as a remote JMX-HTTP bridge.</p> +</div> +<div class="paragraph"> +<p>Karaf provides a jolokia feature, ready to install:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>karaf@root()> feature:install jolokia</pre> +</div> +</div> +<div class="paragraph"> +<p>By default, Jolokia is listening on the port <code>8181</code> (see the <a href="webcontainer">WebContainer (JSP/Servlet)</a> page for details about the HTTP configuration).</p> +</div> +<div class="paragraph"> +<p>If you point a browser on <a href="http://localhost:8181/jolokia"; class="bare">http://localhost:8181/jolokia</a> you will see a JSON output like:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>{"timestamp":1421765829,"status":200,"request":{"type":"version"},"value":{"protocol":"7.2","config":{"useRestrictorService":"false","canonicalNaming":"true","includeStackTrace":"true","listenForHttpService":"true","historyMaxEntries":"10","agentId":"192.168.134.10-5922-6eb8d517-osgi","debug":"false","realm":"karaf","serializeException":"false","agentContext":"\/jolokia","agentType":"servlet","policyLocation":"classpath:\/jolokia-access.xml","user":"karaf","debugMaxEntries":"100","authMode":"jaas","mimeType":"text\/plain"},"agent":"1.2.4-SNAPSHOT","info":{"product":"felix","vendor":"Apache","version":"4.4.1"`}</pre> +</div> +</div> +<div class="paragraph"> +<p>You can manipulate the Apache Karaf JMX layer via HTTP and JSON, via system tools (like <code>curl</code>, <code>jmx4perl</code>, monitoring tools (supporting HTTP/JSON), or web applications.</p> +</div> +<div class="paragraph"> +<p>For instance, you can send a JSON request to get details about the current Apache Karaf heap memory usage.</p> +</div> +<div class="paragraph"> +<p>The format of the request is:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>{ + "type":"read", + "mbean":"java.lang:type=Memory", + "attribute":"HeapMemoryUsage", + "path":"used" +}</pre> +</div> +</div> +<div class="paragraph"> +<p>We can send this JSON request using <code>curl</code> and get the result:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre>curl -u karaf -d "{\"type\":\"read\",\"mbean\":\"java.lang:type=Memory\",\"attribute\":\"HeapMemoryUsage\",\"path\":\"used\"}" http://localhost:8181/jolokia/ && echo "" +Enter host password for user 'karaf': +{"timestamp":1421765948,"status":200,"request":{"mbean":"java.lang:type=Memory","path":"used","attribute":"HeapMemoryUsage","type":"read"},"value":69121000}</pre> +</div> +</div> +<div class="paragraph"> +<p>You can find details on the <a href="http://www.jolokia.org";>Jolokia website</a> and in the <a href="http://www.jolokia.org/reference/html/";>documentation</a>.</p> +</div> +</div> +<div class="sect3"> +<h4 id="_apache_karaf_decanter">Apache Karaf Decanter</h4> +<div class="paragraph"> +<p>Apache Karaf Decanter provides a complete monitoring solution including data history, turnkey dashboards, SLA and alerting support.</p> +</div> +</div> +</div> +</div> +<div id="footer"> +<div id="footer-text"> +Last updated 2016-04-27 13:59:28 CEST +</div> +</div> +</body> +</html> \ No newline at end of file
