DS 7.1.2

JMX-Based Monitoring

A number of tools support Java Management Extensions (JMX), including the jconsole command bundled with the Java platform, and VisualVM. JMX is not configured by default.

Configure JMX

  1. Set server Java arguments appropriately to avoid regular full garbage collection (GC) events.

    JMX is based on Java Remote Method Invocation (RMI), which uses references to objects. By default, the JMX client and server perform a full GC periodically to clean up stale references. As a result, the default settings cause JMX to cause a full GC every hour.

    To prevent hourly full GCs when using JMX, add the -XX:+DisableExplicitGC option to the list of start-ds.java-args arguments. You can do this by editing the config/java.properties file and restarting the server.

    Avoid using this argument when importing LDIF online using the import-ldif command. The import process uses GC to work around memory management issues.

  2. Configure the server to activate JMX access.

    The following example uses the reserved port number, 1689:

    $ dsconfig \
     create-connection-handler \
     --handler-name JMX \
     --type jmx \
     --set enabled:true \
     --set listen-port:1689 \
     --hostname localhost \
     --port 4444 \
     --bindDN uid=admin \
     --bindPassword password \
     --usePkcs12TrustStore /path/to/opendj/config/keystore \
     --trustStorePassword:file /path/to/opendj/config/keystore.pin \
     --no-prompt

    The change takes effect immediately.

Connect Over JMX

  1. Add appropriate privileges to access JMX monitoring information.

    By default, no users have privileges to access the JMX connection. The following commands create a user with JMX privileges, who can authenticate over an insecure connection:

    Show commands
    # Create a password policy to allow the user to authenticate insecurely:
    $ dsconfig \
     create-password-policy \
     --policy-name "Allow insecure authentication" \
     --type password-policy \
     --set default-password-storage-scheme:PBKDF2-HMAC-SHA256 \
     --set password-attribute:userPassword \
     --hostname localhost \
     --port 4444 \
     --bindDN uid=admin \
     --bindPassword password \
     --usePkcs12TrustStore /path/to/opendj/config/keystore \
     --trustStorePassword:file /path/to/opendj/config/keystore.pin \
     --no-prompt
    
    # Create a backend for the JMX monitor user entry:
    $ dsconfig \
    create-backend \
     --backend-name jmxMonitorUser \
     --type ldif \
     --set enabled:true \
     --set base-dn:"uid=JMX Monitor" \
     --set ldif-file:db/jmxMonitorUser/jmxMonitorUser.ldif \
     --set is-private-backend:true \
     --hostname localhost \
     --port 4444 \
     --bindDN uid=admin \
     --bindPassword password \
     --usePkcs12TrustStore /path/to/opendj/config/keystore \
     --trustStorePassword:file /path/to/opendj/config/keystore.pin \
     --no-prompt
    
    # Prepare the JMX monitor user entry.
    # Notice the privileges and password policy settings:
    $ cat > /tmp/jmxMonitorUser.ldif << EOF
    dn: uid=JMX Monitor
    objectClass: top
    objectClass: person
    objectClass: organizationalPerson
    objectClass: inetOrgPerson
    cn: JMX Monitor
    sn: User
    uid: JMX Monitor
    userPassword: password
    ds-privilege-name: monitor-read
    ds-privilege-name: jmx-notify
    ds-privilege-name: jmx-read
    ds-privilege-name: jmx-write
    ds-pwp-password-policy-dn: cn=Allow insecure authentication,cn=Password Policies,cn=config
    EOF
    
    # Import the JMX monitor user:
    $ import-ldif \
     --backendID jmxMonitorUser \
     --includeBranch "uid=JMX Monitor" \
     --ldifFile /tmp/jmxMonitorUser.ldif \
     --hostname localhost \
     --port 4444 \
     --bindDN uid=admin \
     --bindPassword password \
     --usePkcs12TrustStore /path/to/opendj/config/keystore \
     --trustStorePassword:file /path/to/opendj/config/keystore.pin
  2. Connect using the service URI, username, and password:

    Service URI

    Full URI to the service including the hostname or IP address and port number for JMX where the DS server listens for connections.

    For example, if the server hostname is localhost, and the DS server listens for JMX connections on port 1689, then the service URI is:

    service:jmx:rmi:///jndi/rmi://localhost:1689/org.opends.server.protocols.jmx.client-unknown
    Username

    The full DN of the user with privileges to connect over JMX, such as uid=JMX Monitor.

    Password

    The bind password for the user.

  3. Connect remotely.

    The following steps show how you connect using VisualVM:

    1. Start VisualVM.

    2. Select File > Add JMX Connection…​ to configure the connection:

      JMX connection configuration window
    3. Select the connection in the left menu to view JMX monitoring information.

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