Using Fastlane to deploy multiple Android apps

We talk about logging in general and the different levels used in java and then we talk about the log4j logging API and how to set it up for writing files, logging to console, or doing a custom setup. We also talk about different frameworks and best practices.

We talk about the Feistal Cipher and implement a simple proof of concept to test the algorithm out. Computerphile video: https://www.youtube.com/watch?v=FGhj3CGxl8I Source code: package org.ea; import java.security.MessageDigest; import java.util.Arrays; public class FeistelAlg { private final static String plainText = "the brown fox jumped over the lazy dog"; public static void doRound(byte[] left, byte[] right) throws…

We look into high availability using Heartbeat and DRBD. Heartbeat is a software to monitor and failover when a machine is unresponsive and DRBD can help you replicate data between machines making your setup highly available. This solution can help you doing maintenance work without downtime.

We are in our new linux environment and create gcc compiler that will be our final compiler. Then we look at some text manipulation libraries, compressors and file attribute tools.

We are in our new linux environment and create coreutils, python, ninja and meson. Talking about their usages and the importance of the utils in the core of linux.

We look into using the cephadm tooling to bootstrap and configure a small cluster with 3 drives and multiple hosts. We go into how cephadm administers different resources and shares them between hosts. Installing main host First we need curl in order to fetch the cephadm application sudo apt install -y curl Then we download…