http://www.randombugs.com Just another Bastard Operator From Hell. Everything from *nix to programming Thu, 05 Jan 2012 11:44:55 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 http://www.randombugs.com/cluster/choosing-communication-library-distributed-application.html http://www.randombugs.com/cluster/choosing-communication-library-distributed-application.html#comments Tue, 03 Jan 2012 08:34:57 +0000 admin http://www.randombugs.com/?p=774
Together with some colleagues I started to put the base for a distributed application. Everything is looking good, but we have a big dilemma. We don’t know what communication API to choose. In first phase we didn’t have so many options to choose, but after some research, we found several good communications libraries, and now, is very hard for us to select the best solution. A few words about this new project. The main idea behind this distributed project is to have a frontend, a backend (processing application) and hundreds ...]]> http://www.randombugs.com/cluster/choosing-communication-library-distributed-application.html/feed 0 http://www.randombugs.com/java/glassfish/installing-glassfish-31-cluster-debian-60-command-line.html http://www.randombugs.com/java/glassfish/installing-glassfish-31-cluster-debian-60-command-line.html#comments Wed, 04 May 2011 12:48:05 +0000 admin http://www.randombugs.com/?p=729
Finlay is here. For me, Glassfish 3.1, was one of most awaited piece of software, for all it’s new features and clustering support. Glassfish 3.1 slightly changed the way to install cluster, in a much better and integrated way. This version come with a lot of new functionality, but also with improved parts related to Glassfish 2.1. The most interesting features of Glassfish 3.1 are: Clustering (100 instances per domain), SSH provisioning, Centralized management (with the help of ssh), High Availability Session Persistence, High Availability Java Message Service, RMI-IIOP Load ...]]> http://www.randombugs.com/java/glassfish/installing-glassfish-31-cluster-debian-60-command-line.html/feed 1 http://www.randombugs.com/java/glassfish/glassfish-enhanced-broker-cluster-failed-load-jdbc-driver.html http://www.randombugs.com/java/glassfish/glassfish-enhanced-broker-cluster-failed-load-jdbc-driver.html#comments Thu, 14 Apr 2011 10:44:11 +0000 admin http://www.randombugs.com/?p=721
Is not a bug, but a pretty annoying configuration thing which appear when you try to configure Enhanced Broker Cluster in Glassfish. I configured my persistent store, for Enhanced Broker Cluster, as jdbc / MySQL: [...] imq.persist.jdbc.dbVendor=mysql imq.persist.jdbc.mysql.driver=com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource imq.persist.jdbc.mysql.property.url=jdbc\:mysql\://sqlserver\:3306/jms imq.persist.jdbc.mysql.needpassword=true imq.persist.jdbc.mysql.user=jms [...] and after at restart I got the following error: [13/Apr/2011:12:12:30 CEST] [B1060]: Loading persistent data… [13/Apr/2011:12:12:30 CEST] ERROR [B3198]: Error initializing cluster manager: com.sun.messaging.jmq.jmsserver.util.BrokerException: [B3024]: Failed to load JDBC driver: com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource at com.sun.messaging.jmq.jmsserver.persist.jdbc.DBManager.(DBManager.java:428) at com.sun.messaging.jmq.jmsserver.persist.jdbc.DBManager.getDBManager(DBManager.java:219) at com.sun.messaging.jmq.jmsserver.persist.jdbc.JDBCStore.(JDBCStore.java:98) ...]]> http://www.randombugs.com/java/glassfish/glassfish-enhanced-broker-cluster-failed-load-jdbc-driver.html/feed 0 http://www.randombugs.com/java/glassfish/snmp-support-glassfish-211-cluster-support.html http://www.randombugs.com/java/glassfish/snmp-support-glassfish-211-cluster-support.html#comments Mon, 14 Mar 2011 11:57:21 +0000 admin http://www.randombugs.com/?p=701
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 ...]]> http://www.randombugs.com/java/glassfish/snmp-support-glassfish-211-cluster-support.html/feed 0 http://www.randombugs.com/java/glassfish/glassfish-cluster-211-httpsessions-replication-multithread-concurrent-access.html http://www.randombugs.com/java/glassfish/glassfish-cluster-211-httpsessions-replication-multithread-concurrent-access.html#comments Wed, 03 Mar 2010 10:07:06 +0000 admin http://www.randombugs.com/?p=634
I have several clusters with Glassfish 2.1.1 in a BIG virtual environment and all worked fine … until I add new processors to this clusters. After upgrade, I started to have problems with HttpSession replication. Starting debugging JXTA, Shoal and the Web Container didn’t help at all. Until I found this page Memory Replication & Multi-threaded Concurrent Access to HttpSessions. My applications was doing multi-thread concurrent access some times (Ajax) and this was the root cause of all lost sessions. I modified sun-web.xml from my application, accordingly with the ...]]> http://www.randombugs.com/java/glassfish/glassfish-cluster-211-httpsessions-replication-multithread-concurrent-access.html/feed 3 http://www.randombugs.com/java/glassfish/upgrade-glassfish-21-211.html http://www.randombugs.com/java/glassfish/upgrade-glassfish-21-211.html#comments Tue, 29 Dec 2009 13:39:54 +0000 admin http://www.randombugs.com/?p=625
For some reasons the asupgrade tool from Sun Glassfish doesn’t work if you want to upgrade your Glassfish from 2.1 to 2.1.1. The upgrade method what I will present you in the next post, probably, is not recommended by SUN, but it will work in most cases (clustered or not). Just follow this steps: 1. Stop all domains, node agents, instances from all cluster (or only the domain if you have only 1 server) 2. Rename Glassfish folder to g2.1 3. Install glassfish 2.1.1 $ java -Xmx256m -jar glassfish-installer-v2.1.1-b31g-linux.jar $ cd glassfish $ chmod +x lib/ant/bin/ant $ ...]]> http://www.randombugs.com/java/glassfish/upgrade-glassfish-21-211.html/feed 1 http://www.randombugs.com/java/glassfish/changeing-defaults-ports-jms-glassfish.html http://www.randombugs.com/java/glassfish/changeing-defaults-ports-jms-glassfish.html#comments Thu, 28 May 2009 07:47:28 +0000 admin http://www.randombugs.com/?p=452
Why you should do that? All this ports, by default, are allocated dynamically and if you want to use a firewall between your client and JMS broker then you should have static ports assigned. Another solution is to tunnel through httpjms and httpsjms protocol but this are slow. In the next article I will show you how to assign static ports to this JMS service in Glassfish. To show you the all ports what need for JMS I just “ripped” the following table from SUN Site: http://docs.sun.com/app/docs/doc/820-4916/gcuhq?a=view Connection ...]]> http://www.randombugs.com/java/glassfish/changeing-defaults-ports-jms-glassfish.html/feed 1 http://www.randombugs.com/java/glassfish/install-glassfish-21-hadb.html http://www.randombugs.com/java/glassfish/install-glassfish-21-hadb.html#comments Fri, 24 Apr 2009 09:06:25 +0000 admin http://www.randombugs.com/?p=403
If you want 99.999% availability of your Glassfish cluster then you should do 2 things: 1. Use HADB for user HTTP and Session persistence, 2. get some SUN support. I cannot help you with the decision on point 2, but with point 1 I will show you how to doit.In this article I will NOT start again to show you how to configure a Glassfish cluster, because this is already made in this article. Today I will present how to add HADB functionality to a existent Glassfish cluster. Note: Install ...]]> http://www.randombugs.com/java/glassfish/install-glassfish-21-hadb.html/feed 2 http://www.randombugs.com/linux/howto-monitor-linux-heartbeat-snmp.html http://www.randombugs.com/linux/howto-monitor-linux-heartbeat-snmp.html#comments Fri, 20 Mar 2009 13:09:30 +0000 admin http://www.randombugs.com/?p=328
Monitoring is one of the most vital part of all online business right now. A server what fail to deliver its content to a client it’s a big problem, because of this server disruptive service or downtime is our the worst enemies. Some downtimes are impossible to be predicted and monitoring your system is the best thing you can do. Did you ever asked yourself what means 99% availability? 7 hours per month of downtime. 7 hours for a client can be very frustrating. In this article I will try to ...]]> http://www.randombugs.com/linux/howto-monitor-linux-heartbeat-snmp.html/feed 1 http://www.randombugs.com/java/glassfish/cluster-glassfish-21.html http://www.randombugs.com/java/glassfish/cluster-glassfish-21.html#comments Thu, 29 Jan 2009 11:36:09 +0000 admin http://www.randombugs.com/?p=146
Again some problems with glassfish cluster. If in Glassfish v2UR2 all was ok in Glassfish 2.1 we had some problems. This post is based on How to install and configure a Glassfish cluster my early article. So first part of installing the cluster, first server with DAS and all the stuff is working perfectly, but second part when we need to add more instances we get some problems. Following the steps to add a new instance on the cluster we get an error: asadmin start-node-agent –syncinstances=true ws-agent-2 Please enter the master password ...]]> http://www.randombugs.com/java/glassfish/cluster-glassfish-21.html/feed 6