Author Archives: George Valentin Voina

XA datasources with #WebSphere and #Oracle

By | December 5, 2017
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When using XA data sources with Websphere and Oracle we must grant to the Oracle user rights to perform XA recovery. STEP 1: Create an XA datasource AdminTask.createJDBCProvider(‘[-scope Node=’+ node +’,Server=’+serverName +’ -databaseType Oracle -providerType “Oracle JDBC Driver” -implementationType “XA data source” -name “‘+jdbcXAProviderName +'” -description “Oracle JDBC Driver (XA)” -classpath [${ORACLE_JDBC_DRIVER_PATH}/ojdbc7.jar ] -nativePath “”… Read More »

#Websphere SIB issues when running Websphere in a #Docker container

By | November 14, 2017
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When running a Websphere Application server instance in a docker container, if the Service Integration Bus (SIB) is defined to store all the messages and data in an external database there is an issue caused by the way the bus is created. When the SIB is initialized the given name depends on the hostname of… Read More »

Bind #Docker container ports to virtual interfaces to simulate cluster nodes

By | November 8, 2017
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My setup implies that I have 3 almost identical application nodes (running as containers) that are part of a cluster and they need to be mapped to different external IPs (not part of the docker ingress network) because they are added in a cluster configuration external to docker. The default behavior of port binding is… Read More »

TCP keepalive: what is it, why do you need it, how to configure it on #Linux

By | November 7, 2017
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As you are aware, no service runs alone on some server. You always have to take into account the communication layer between your server and client services. One of the most tricky thing a lot of people overlook is the “housekeeping” of the communication layer. In a properly setup enterprise environment your communication layer (firewalls,… Read More »

#RaspberryPi python games for #Pimoroni Unicorn HAT HD

By | November 7, 2017
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There are some nice demos that come with Pimoroni Unicorn HAT HD library but if you want something more fun you can have interactive applications. How about GAMES ? I stumbled over a thread Unicorn HAT Demo Ideas where someone was asking foe ideas of demos for the standard Unicorn HAT. Two of the best… Read More »

#RaspberryPi with #Pimoroni Unicorn HAT HD

By | October 21, 2017
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This pumped up Pimoroni Unicorn HAT HD is an incredible toy. The content of the kit looks like the following: – a 256 RGB LED pixels in a 16×16 matrix. Pixels driven by ARM STM32F and three STP16CPC26 LED drivers – Bundled ninja diffuser – Nuts(4) and bolts (8 + 3 spares) I was able… Read More »

#RaspberryPi toys from #Pimoroni

By | October 21, 2017
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Because this month is my Birthday like a true big kid I brought some toys. What better place to buy shiny and sparkling new toys can you find compared to Pimoroni ? The service was very fast and I really liked the presentation: So what is the content of the box and the reason for… Read More »

#Windows10 – set English language but with German keyboard layout

By | October 21, 2017
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I have a nice mechanical keyboard “VicTsing® Mechanical PC Gaming Keyboard 87” with German layout, but I prefer my Windows 10 in English. The quick solution the use the keyboard was to add also German language support but kept English as default language. Then the most annoying and frustrating thing kept happening: 1. I selected… Read More »

Back-up of /home of a running system using lv snapshot

By | October 21, 2017
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Following is a simple and easy way to do a consistent back-up of the /home directory (usually mounted in a separate partition) on a running system. We do not have the luxury of being able to stop the operations of a server and unmount the home partition to make sure no changes are done during… Read More »

Find in Linux if your installed RAM is ECC

By | October 21, 2017
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Sometimes really simple questions are hard to answer. One day I got the question from a coworker: “How do I know if some installed RAM is ECC or not”. The easiest way is to use dmidecode command that dumps in Linux all the system characteristics. But because I had no idea how to see if… Read More »