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MySQL supports multiple storage engines, with InnoDB and MyISAM being the most commonly used. ------------------------------------------------------------------------------------------------------------------------------------------------ MyISAM Table-Lev...

MySQL replication is a process that allows data from one MySQL database server (the primary or source server) to be copied automatically to one or more MySQL database servers (replica or slave servers). Replication is used to improve data availability, load ba...

=================================================================================== Percona XtraBackup Percona XtraBackup is a widely used open-source tool for MySQL and MariaDB database backups. It is developed by Percona and is specifically designed to per...

Adding a new Zabbix Agent sudo apt install zabbix-agent sudo systemctl status zabbix-agent Configure IP address of Zabbix server vim /etc/zabbix/zabbix_agentd.conf Locate the Server= and ServerActive= parameters in the configuration file. Uncommen...

Maths + addition - subtraction * multiplication / Division // Floor Division an operation that divides two numbers and returns the largest integer less than or equal to the quotient.   When you divide 7 by 3, you get approx...

Flask is a web framework library for Python. Install Flask library: pip3 install flask initialise Flask application app = Flask(__name__) Define a route for the app: @app.route('/') def hello_world(): return 'Hello, World!' Run a Flask applica...

import library: from getpass import getpass from mysql.connector import connect, Error Configuring MySQL connection details: try: ##try statement used as the code isn't guaranteed to function## connection = mysql.connector.connect( host="loca...

pip3 install requests   requests.get(url, allow_redirects=True)

Install packages for master Disable SWAP: sudo swapoff -a  Install docker: sudo apt install -y docker.io Debian, Ubuntu, and operating systems using apt/apt-getReplace the apt repository definition so that apt points to the new repository instead of the G...

Network Bridges A network bridge in Docker is a virtual network that allows containers to communicate with each other while isolating them from the host network and other networks. By default, if no network is specified when a container is created, it will...

Each docker container has its own isolated volume. By default, this volume isn't persistent, meaning that if the container restarts or gets deleted, then so does its data. There are a few options available for persistent storage. Specifying volume options ...

Building a Docker File A docker file is essentially a list of instructions that are issued to Docker to build an image. You will more than likely want to build your Docker File somewhere that you can access all the files required for the application you're ...

What is Kubernetes? Kubernetes is at its core a container orchestrator. Kubernetes, or K8S, is used to control containers across various nodes (workers), and offers features such as load balancing, automated scaling for increases/decreases in demand, and node...

Docker Engine is the core component of the Docker platform. It is responsible for creating, running, and managing Docker containers on a host operating system. Docker Engine provides the underlying runtime environment where containers are executed, and it inte...

By default, Docker imposes no restrictions on the amount of system resources that a container can use.  Control groups (or cgroups) are a Linux kernel feature that allows you to allocate, limit, and isolate resource usage (such as CPU, memory, disk I/O, netwo...

Docker Swarm is Docker's native clustering and orchestration tool, allowing you to manage a group of Docker engines across multiple nodes (hosts). Initialise Docker Swarm manager node: docker swarm init Similar to K8S, in the output of this command, you'l...

kubectl The kubectl command is used to interact with and manage a Kubernetes cluster. It allows administrators and developers to deploy applications, inspect resources, manage cluster components, and view logs. Essentially, kubectl acts as the command-line in...