Enabling JMX authentication 

The default settings for Cassandra make JMX accessible only from localhost. To enable remote JMX connections, change the LOCAL_JMX setting in cassandra-env.sh.

The default settings for Cassandra make JMX accessible only from localhost. If you want to enable remote JMX connections, change the LOCAL_JMX setting in cassandra-env.sh and enable authentication and/or ssl. After you enable JMX authentication, ensure that tools that use JMX, such as nodetool and DataStax OpsCenter, are configured to use authentication.

To use JMX authentication for OpsCenter, follow the steps in Modifying OpsCenter cluster connections.

Procedure

  1. Open the cassandra-env.sh file for editing and update or add these lines:
    JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.authenticate=true"
    JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.password.file=/etc/cassandra/jmxremote.password"
    If the LOCAL_JMX setting is in your file:
    LOCAL_JMX=no
  2. Depending on whether the JDK or JRE is installed:
    • Copy the jmxremote.password.template from /jdk_install_location/jre/lib/management/ to /etc/cassandra/ and rename it to jmxremote.password:
      $ cp /jdk_install_dir/lib/management/jmxremote.password.template /etc/cassandra/jmxremote.password
    • Copy the jmxremote.password.template from /jre_install_location/lib/management/ to /etc/cassandra/ and rename it to jmxremote.password
      $ cp /jre_install_dir/lib/management/jmxremote.password.template /etc/cassandra/jmxremote.password
  3. Change the ownership of jmxremote.password to the user you run cassandra with and change permission to read only:
    $ chown cassandra:cassandra /etc/cassandra/jmxremote.password
    $ chmod 400 /etc/cassandra/jmxremote.password
  4. Edit jmxremote.password and add the user and password for JMX-compliant utilities:
    monitorRole QED
    controlRole R&D
    cassandra cassandrapassword
    Note: This cassandra user and cassandra password is just an example. Specify the user and password for your environment.
  5. Add the cassandra user with read and write permission to /jre_install_location/lib/management/jmxremote.access:
    monitorRole readonly
    cassandra readwrite
    controlRole readwrite \
    create javax.management.monitor.,javax.management.timer. \
    unregister
  6. Restart Cassandra.
  7. Run nodetool with the cassandra user and password.
    $ nodetool -u cassandra -pw cassandra status

Results

If you run nodetool without user and password, you see an error similar to:
root@VM1 cassandra]# nodetool status
Exception in thread "main" java.lang.SecurityException: Authentication failed! Credentials required
at com.sun.jmx.remote.security.JMXPluggableAuthenticator.authenticationFailure(Unknown Source)
at com.sun.jmx.remote.security.JMXPluggableAuthenticator.authenticate(Unknown Source)
at sun.management.jmxremote.ConnectorBootstrap$AccessFileCheckerAuthenticator.authenticate(Unknown Source)
at javax.management.remote.rmi.RMIServerImpl.doNewClient(Unknown Source)
at javax.management.remote.rmi.RMIServerImpl.newClient(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at javax.management.remote.rmi.RMIServerImpl_Stub.newClient(Unknown Source)
at javax.management.remote.rmi.RMIConnector.getConnection(Unknown Source)
at javax.management.remote.rmi.RMIConnector.connect(Unknown Source)
at javax.management.remote.JMXConnectorFactory.connect(Unknown Source)
at org.apache.cassandra.tools.NodeProbe.connect(NodeProbe.java:146)
at org.apache.cassandra.tools.NodeProbe.<init>(NodeProbe.java:116)
at org.apache.cassandra.tools.NodeCmd.main(NodeCmd.java:1099)