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AMD Is Currently Hiring More Linux Engineers

While AMD has been delivering reliable Linux support with their recent launches, there is room for improvement in areas like more timely compiler support for new processors, better alignment of their new hardware enablement for getting the code not only upstreamed but into distributions for launch-day, and similar areas.

Refactoring one Java CRUD Application via adding two constructors to Bean class

The original application https://www.javatpoint.com/crud-in-jsp is using bean without any explicitly declared constructor . To be able invoke different constructors first one for "Update","Insert", "Delete" and another one for "Select" which is supposed to be invoked explicitly we've done following updates to bean User.java.

Recursion in Python. Having fun writing code to help out unhappy kids

The only purpose of python coding below is to prevent kids from straight forward calculations, which, actually, are boring rather then difficult. In doing so I intend to learn my students pretty old principle "Just think first"

Setting up Connection pooling on TomCat 9.0.41 Java Web Server

This Howto follows official guidelines and might be a bit more straight forward and easier to reproduce then original . That is a way I was able to get JNDI up and running on 9.0.41 release . I have also compiled in one post displaying mariadb's table data via Servlet and via JSP based on utilizing tags supported via the most recent versions of taglibs 1.2.5.

Setting up Tomcat 9.0.41 && mariadb-server 10.5 on Debian Bullseye/sid

Setup Tomcat via original tar.gz ball and JDK 11 allow to deploy "war" archive been built for Web Servlet Application from http://lxer.com/module/newswire/view/295844/index.html . Thus CRUD Server side Java Apps might be moved on Debian Bullseye/sid in 3-5 minutes .

Adding packaging and refactoring one sample of Java CRUD Application for Tomcat 9.0.41

Why packaging is important ? Original code was pretty straight forward Java coding which looks and works quite smoothly . However, all compiled classes appear to be placed in one folder WEB-INF/classes/ and in some way this minor design issue hides a business logic of apps.

Deployment Java CRUD App to Tomcat 9.0.40

As far as I can see any Java CRUD App would require a hack kind of described below , no matter is it "update" or "insert" or "select" JDBC setup doesn't work as it did earlier . Code bellow - invoking Connection "conn = DBConnection.createConnection();" along with localized JDBC setup in DBConnection.java works for me.

Sample of manual build MVC Web Application for Tomcat 9.0.40

This post follows up "Practice coding in Java by writing a game" recently published at LXER. Focus has been done on manual invoking "javac" using standard command line options for placing in right folders packaged Java Beans and Servlets which are required by Tomcat 9 Java Web's server.

Debian Testing UEFI setup on bare metal via manual partitioning

Even though snaps show was created in VENV, everything works the same way on bare metal. After you created the new partition of desired size installer brings you to screen which allows to redefine functionality of partition and assign name to folder supposed to be mounted on this partition . In case name of folder is not on the list you can create new folder's name manually . . . .

NVMe vs SSD: Speed, Storage & Mistakes to Avoid

NVMe is not affected by the ATA interface constrictions as it sits right on the top of the PCI Express directly connected to the CPU. That results in 4 times faster Input/Output Operations Per Second (IOPs) rivaling the fastest SAS option out there. The seek time for data is ten times faster. NVMe can deliver sustained read-write speed of 2000MB per second, way faster than the SATA SSD III, which limits at 600MB per second. Here the bottleneck is NAND technology, which is rapidly advancing, which means we’ll likely see higher speeds soon with NVMe.

Install Debian Testing ( the most recent bullseye weekly build ) with KDE Plasma on bare metal

  • https://dbaxps.blogspot.com/; By Boris Derzhavets (Posted by dba477 on Dec 2, 2020 12:47 AM EDT)
  • Story Type: Tutorial; Groups: Debian, KDE
It appears that straight forward install Debian Testing via official ISO image at least in meantime hangs . Looks like "sddm" hangs attempting to pop up logging screen prompt . . .

Install KDE Plasma on SparkyLinux GameOver 08/11 2020

  • https://dbaxps.blogspot.com/; By Boris Derzhavets (Posted by dba477 on Nov 28, 2020 1:02 PM EDT)
  • Story Type: Tutorial; Groups: Debian, KDE
At the time of writing KDE Plasma install on any SparkyLinux 2020.09 might be committed via GDM3 installation right after KDE Plasma due to after system reboot GDM seems to be the only one DM on Sparky detecting previously installed KDE.

Install Oracle’s VirtualBox 6.1.16 on Fedora 33

This is a bit different method until Oracle release Fedora 33 repositories. Fedora 32 VirtualBox rpm works with Fedora 33, but unfortunately there is fixed version of python(abi) = 3.8, we have to change this and rebuild rpm package. Here is commands howto do it.

Setting up KVM Hypervisor on SparkyLinux 2020.9 rolled forward up to 11/08/2020 (VENV)

Due to Libvirt version 6.8.0 there is no more any problems with deployment KVM Guests on EXT4 file system.

Setting up KVM Hypervisor on Ubuntu Groovy Gorilla (20.10)

Due to version LIBVIRT&&QEMU you are forced to deploy Ubuntu 20.10 on Btrfs file system . In particular case, Virtual Environment is a fair enough.

Install KVM with UEFI Guests support on Manjaro KDE 20.1.1

Attempt to test another Linux distro Manjaro KDE 20.1.1 as Virthost managed via Cockpit Web Console, i.e. deployment and management KVM guests on the recent Manjaro KDE utilizing Web Console . Bare metal platform is Ryzen 7 3700X based with 16 GB RAM and mother board MSI X570 A-PRO ( SVM status enabled )

Attempt to evaluate Cockpit Web Console on Server Fedora 33 (VENV) based on the most recent nightly build

In current post we intend to test Cocpit Web Console functionality on pre-release Fedora 33 Server based on the most recent Fedora nightly builds list . Start with deploying Server Fedora 33 as VM (L1) on Server Fedora 32 (bare metal)

QEMU Internals: Big picture overview

  • http://blog.vmsplice.net; By Stefan Hajnoczi (Posted by dba477 on Oct 4, 2020 12:39 PM EDT)
  • Story Type: Reviews, Tutorial
I believe that this article is worth reading even in meantime as well as another one been written by the same author "QEMU Internals: Overall architecture and threading model"

Setting up Fedora 33 beta L1&&L2 KVM guests all seating on the same office LAN

Following below verifies Fedora 33 beta L1 Guest ability to perform KVM deployment Fedora 33 beta L2 Guest inside itself. Deployment is based on bridge to virtual interface of L1 F33 beta guest due to L1 guest has been deployed on external office network , L2 Guest also appears to be set up on the same external network.

Install Virtual Box on SparkyLinux 2020.09 (Debian bullseye Testing based distro)

Following below is a brief "howto" succeed with mentioned installation on SparkyLinux 2020.09 in meantime

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