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Snmp support for Glassfish 2.1.1 (with cluster support)

14 March 2011 One Comment

Why you choose SNMP when Glassfish have strong JMX support? I presume, the answer for all who use SNMP is (almost) the same: Because the architecture of current monitoring solution is not scalable enough, and I cannot load my monitoring servers with supplementary JAVA processes.

Before starting using SNMP I tried to see what solutions I have:
1. Re-design entire monitoring solution
2. Use SNMP

I’m a lazy person, so I choose to add SNMP support for all our clusters :).

To do that you should do 3 easy steps:

1. Upload the JVM-MANAGEMENT-MIB to your MIB folder on the monitoring server (In Debian is /usr/share/snmp/mibs/). This step is optional if you know all OIDS by yourself 🙂

2. Configure your glassfish
Log on your DAS, go to Configurations, choose your configuration, click on JVM Settings-> JVM Options and add the next 3 lines:


(The same is for glassfish with cluster support)

3. Edit The ACL List
Edit /etc/java-6-sun/management/snmp.acl and add at the end of the file:

acl = {
communities = mypassword
access = read-only
managers = localhost, jack.randombugs.com

Where jack.randombugs.com is your monitoring server.

Now you should fix the permissions on /etc/java-6-sun/management/snmp.acl, because the glassfish will fail with the following error if this file doesn’t have the right permissions:

Error: Password file read access must be restricted: /etc/java-6-sun/management/snmp.acl

To fix that change the owner and permissions on snmp.acl file:

[randombugs@jack]# chown [your glassfish user (don't use root)] /etc/java-6-sun/management/snmp.acl
[randombugs@jack]# chmod o-r /etc/java-6-sun/management/snmp.acl
[randombugs@jack]# chmod g-r /etc/java-6-sun/management/snmp.acl

Now you are ready. Just restart your glassfish and test:

[randombugs@jack]$ snmpwalk -m all -v2c -c mypassword myserver:162 .
JVM-MANAGEMENT-MIB::jvmClassesLoadedCount.0 = Gauge32: 596524
JVM-MANAGEMENT-MIB::jvmClassesTotalLoadedCount.0 = Counter64: 597036
JVM-MANAGEMENT-MIB::jvmClassesUnloadedCount.0 = Counter64: 512
JVM-MANAGEMENT-MIB::jvmClassesVerboseLevel.0 = INTEGER: silent(1)
JVM-MANAGEMENT-MIB::jvmMemoryPendingFinalCount.0 = Gauge32: 0
JVM-MANAGEMENT-MIB::jvmMemoryGCVerboseLevel.0 = INTEGER: silent(1)
JVM-MANAGEMENT-MIB::jvmMemoryGCCall.0 = INTEGER: supported(2)
JVM-MANAGEMENT-MIB::jvmMemoryHeapInitSize.0 = Counter64: 5368709120 bytes
JVM-MANAGEMENT-MIB::jvmMemoryHeapUsed.0 = Counter64: 1010489720 bytes
JVM-MANAGEMENT-MIB::jvmMemoryHeapCommitted.0 = Counter64: 5234491392 bytes
JVM-MANAGEMENT-MIB::jvmMemoryHeapMaxSize.0 = Counter64: 5234491392 bytes
JVM-MANAGEMENT-MIB::jvmMemoryNonHeapInitSize.0 = Counter64: 24313856 bytes
JVM-MANAGEMENT-MIB::jvmMemoryNonHeapUsed.0 = Counter64: 272285824 bytes
JVM-MANAGEMENT-MIB::jvmMemoryNonHeapCommitted.0 = Counter64: 289800192 bytes
JVM-MANAGEMENT-MIB::jvmMemoryNonHeapMaxSize.0 = Counter64: 318767104 bytes
JVM-MANAGEMENT-MIB::jvmMemManagerName.1 = STRING: CodeCacheManager
JVM-MANAGEMENT-MIB::jvmMemManagerName.2 = STRING: ParNew
JVM-MANAGEMENT-MIB::jvmMemManagerName.3 = STRING: ConcurrentMarkSweep
JVM-MANAGEMENT-MIB::jvmMemManagerState.1 = INTEGER: valid(2)
JVM-MANAGEMENT-MIB::jvmMemManagerState.2 = INTEGER: valid(2)
JVM-MANAGEMENT-MIB::jvmMemManagerState.3 = INTEGER: valid(2)
JVM-MANAGEMENT-MIB::jvmMemGCCount.2 = Counter64: 39
JVM-MANAGEMENT-MIB::jvmMemGCCount.3 = Counter64: 70
JVM-MANAGEMENT-MIB::jvmMemGCTimeMs.2 = Counter64: 5941 milliseconds
JVM-MANAGEMENT-MIB::jvmMemGCTimeMs.3 = Counter64: 59 milliseconds
JVM-MANAGEMENT-MIB::jvmMemPoolName.1 = STRING: Code Cache
JVM-MANAGEMENT-MIB::jvmMemPoolName.2 = STRING: Par Eden Space
JVM-MANAGEMENT-MIB::jvmMemPoolName.3 = STRING: Par Survivor Space
JVM-MANAGEMENT-MIB::jvmMemPoolType.1 = INTEGER: nonheap(1)
JVM-MANAGEMENT-MIB::jvmMemPoolType.2 = INTEGER: heap(2)
JVM-MANAGEMENT-MIB::jvmMemPoolType.3 = INTEGER: heap(2)
JVM-MANAGEMENT-MIB::jvmMemPoolType.4 = INTEGER: heap(2)
JVM-MANAGEMENT-MIB::jvmMemPoolType.5 = INTEGER: nonheap(1)
JVM-MANAGEMENT-MIB::jvmMemPoolState.1 = INTEGER: valid(2)
JVM-MANAGEMENT-MIB::jvmMemPoolState.2 = INTEGER: valid(2)
JVM-MANAGEMENT-MIB::jvmMemPoolState.3 = INTEGER: valid(2)
JVM-MANAGEMENT-MIB::jvmMemPoolState.4 = INTEGER: valid(2)
JVM-MANAGEMENT-MIB::jvmMemPoolState.5 = INTEGER: valid(2)

Does anybody know about a C/C++ JMX client implementation ?


It seems, adding this new jvm options, will break the logging. The bug is documented here http://java.net/jira/browse/GLASSFISH-4013 and the bug is fixed only on Glassfish 3.

The exception generated is:

Could not load Logmanager "com.sun.enterprise.server.logging.ServerLogManager"
java.lang.ClassNotFoundException: com.sun.enterprise.server.logging.ServerLogManager
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.util.logging.LogManager$1.run(LogManager.java:166)
at java.security.AccessController.doPrivileged(Native Method)
at java.util.logging.LogManager.(LogManager.java:156)
at java.util.logging.Logger.getLogger(Logger.java:287)
at sun.management.snmp.util.MibLogger.(MibLogger.java:57)
at sun.management.snmp.util.MibLogger.(MibLogger.java:42)
at sun.management.snmp.AdaptorBootstrap.(AdaptorBootstrap.java:46)
at sun.management.Agent.startAgent(Agent.java:113)
at sun.management.Agent.startAgent(Agent.java:239)

Good Luck!

One Comment »

  • Eva said:

    I really appreciate you sharing this. I did quite a bit of programming in college and i really loved it but unfortunately no java. I’m trying to study that on my own as it’s really useful to know these things in SEO.

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