http://www.randombugs.com Just another Bastard Operator From Hell. Everything from *nix to programming Thu, 29 Oct 2009 09:21:54 +0000 http://wordpress.org/?v=2.8.5 en hourly 1 RandomBugshttp://feedburner.google.com http://www.randombugs.com/recovery/vmfs-datastore-missing-2.html http://www.randombugs.com/recovery/vmfs-datastore-missing-2.html#comments Thu, 22 Oct 2009 11:17:19 +0000 admin http://www.randombugs.com/?p=617
After successfully install of ESXi 3.5 server, my datastore1 disappeared unexpectedly after first or second reboot. Is possible to be because of my “hacks” in “Advanced Settings”, but I’m not very sure about that. Looking in /var/log/messages I spotted some very strange errors: Error Stream from partedUtil while getting partitions: Error: The partition table on /dev/disks/vmhba0:0:0:0 is inconsistent. There are many reasons why this might be the case. However, the most likely reason is that Linux detected the BIOS geometry for /dev/disks/vmhba0:0:0:0 incorrectly. GNU Parted suspects the ...]]> http://www.randombugs.com/recovery/vmfs-datastore-missing-2.html/feed 0 http://www.randombugs.com/java/glassfish/changing-logging-system-glassfish-21.html http://www.randombugs.com/java/glassfish/changing-logging-system-glassfish-21.html#comments Mon, 28 Sep 2009 18:04:20 +0000 admin http://www.randombugs.com/?p=606
A lot of people are not satisfied by the default Java Logging (JUL) in Glassfish. Also, myself I encountered some problems on clustered environments where we should have one single log and not one log for each instance. Trying to change the logging system in Glassfish it looks to be almost impossible , but I found a very interesting project java.util.logging to log4j Bridge and the sky become more clear for Glassfish logging. Jul to Log4J Bridge are part of log4J project and is very useful when you ...]]> http://www.randombugs.com/java/glassfish/changing-logging-system-glassfish-21.html/feed 0 http://www.randombugs.com/java/dbappender-log4j-12.html http://www.randombugs.com/java/dbappender-log4j-12.html#comments Thu, 24 Sep 2009 20:19:46 +0000 admin http://www.randombugs.com/?p=595
Initially, DBAppender for Log4j was introduced in version 1.3 of Log4j, but this version was ABANDONED by Apache team. DBAppender is very useful when we want to send our log on a JNDI resource and not on standard JDBC or file. If you need just logging in a database for your application, then you should use JDBCAppender. If you want to log on a JNDI or Database Connection Pool the DBAppender is for you. In this post I will show you how to get, compile and quick test the DBAppender. 1. ...]]> http://www.randombugs.com/java/dbappender-log4j-12.html/feed 1 http://www.randombugs.com/java/javalangsecurityexception-jce-authenticate-provider-bc.html http://www.randombugs.com/java/javalangsecurityexception-jce-authenticate-provider-bc.html#comments Mon, 10 Aug 2009 09:57:57 +0000 admin http://www.randombugs.com/?p=577
Trying to integrate BouncyCastle Cryptography provider in Java can be a nightmare. I read a lot of forums messages about “JCE cannot authenticate the provider BC” and I didn’t find any clear response. After several hours of tweaking and digging I found the main reason of the problem. If you want to use BouncyCastle as Security provider then install it directly on your Java Virtual Machine and remove any library of bc from your application. How to install correctly Bouncy Castle on your JVM: First for Ubuntu/Debian users you should look ...]]> http://www.randombugs.com/java/javalangsecurityexception-jce-authenticate-provider-bc.html/feed 0 http://www.randombugs.com/linux/tuning-linux-system-database.html http://www.randombugs.com/linux/tuning-linux-system-database.html#comments Thu, 16 Jul 2009 17:24:13 +0000 admin http://www.randombugs.com/?p=567
In my experiments with databases I was constrained to tune the system together with the databases. A system what will run a database is quite different from any other server system, because databases put a lot of stress on the IO and especially on the disks (probably the file servers too). Hardware is not all you should tune your system as much as possible. In this post I will talk about Linux with Ext3 (is what I have right now), but on future I will test OpenSolaris with ZFS. 1. ...]]> http://www.randombugs.com/linux/tuning-linux-system-database.html/feed 1 http://www.randombugs.com/linux/compiling-sysbench-0412-debian.html http://www.randombugs.com/linux/compiling-sysbench-0412-debian.html#comments Thu, 09 Jul 2009 14:09:09 +0000 admin http://www.randombugs.com/?p=556
On the Linux market are a lot of distributions and every distribution is unique in his way. Is normal to have different compilers and tools from distribution to distribution so is almost normal to have programs what doesn’t compile on all distributions. sysbench 0.4.12 is one of them. Anyway the solution is simple and I will describe it very quickly how to compile sysbench under Debian. Probably it will work for other distributions if you have the same problem. Let’s start with the error. I run the normal steps to ...]]> http://www.randombugs.com/linux/compiling-sysbench-0412-debian.html/feed 4 http://www.randombugs.com/linux/vmware-webservice-gsoap.html http://www.randombugs.com/linux/vmware-webservice-gsoap.html#comments Fri, 26 Jun 2009 15:12:04 +0000 admin http://www.randombugs.com/?p=529
For me one of the most annoying thing from VMware is the VMware Infrastructure Client, because it doesn’t support Linux. Every-time when I want to manage some machines, or I want to see the IP/Status/etc of some machines, I need to log on on some Windows Server and run the VMware Infrastructure Client from there. Because I’m running exclusively on Linux (Debian 5.0.1 Lenny) on my workstation, this can be very annoying. Anyway, VMware VirtualCenter is exposing to us a set of web services who can control your VMware ESX ...]]> http://www.randombugs.com/linux/vmware-webservice-gsoap.html/feed 0 http://www.randombugs.com/tuning/compile-install-run-modlimitipconn-apache2-debian.html http://www.randombugs.com/tuning/compile-install-run-modlimitipconn-apache2-debian.html#comments Mon, 22 Jun 2009 17:17:48 +0000 admin http://www.randombugs.com/?p=509
Limiting abusers from running 20 download threads from the same Apache server is easy now with mod_limitipconn. But the apache 2 module, mod_limitipconn, is not available under the latest Debian distribution, Lenny. In this mini how-to I will show you how-to manage this module to work for Debian Lenny users. The compile process of mod_limitipconn is a little bit more than “make install”. First install apache prefork development utilities (we need apxs2 to compile our module) [rb@randombugs]# apt-get install apache2-prefork-dev After that, download source code of iplimit module from http://dominia.org/djao/limitipconn2.html and unpack it [rb@randombugs]# ...]]> http://www.randombugs.com/tuning/compile-install-run-modlimitipconn-apache2-debian.html/feed 0 http://www.randombugs.com/linux/mysql-postgresql-benchmarks.html http://www.randombugs.com/linux/mysql-postgresql-benchmarks.html#comments Thu, 18 Jun 2009 14:25:25 +0000 admin http://www.randombugs.com/?p=458
We are living interesting times ... MySQL was first purchased by SUN and now SUN was purchased by ORACLE. I don't know what future will reserve for MySQL, but in this moment it seems MySQL is coming very very close to PostgreSQL. We are NOT talking about MySQL with MyISAM, we are talking about MySQL with InnoDB, because I'm directly interested in a set of properties what PostgreSQL already have them built-in and MySQL achieve them through InnoDB (and the new Maria Data plugin). This properties are Atomicity, Consistency, Isolation, Durability = ACID, in other words, very stable, good integrity and crash proof database. Why an ACID database? Sometimes we are more interested in ACID for our data than raw speed. For example do you keep your savings to a bank who is running a NON ACID database? I think you understand my concern. ]]> http://www.randombugs.com/linux/mysql-postgresql-benchmarks.html/feed 29 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 0