Freaks City

Prerequisites Supported CentOS Versions Docker is compatible with the following CentOS releases: CentOS 7 (64-bit) CentOS 6.5 (64-bit) or later versions System Requirements Docker requires specific kernel versions depending on your CentOS version: CentOS 7: 64-bit system with kernel version 3.10 or higher CentOS 6.5 or later: 64-bit system w ...

Image Sources and Container Management Docker images can be categorized into two main types: Base System Images: Minimal operating system templates used as foundations Application Images: Pre-configured service images ready for deployment Creating base system images from templates: # Import CentOS 6 minimal template cat centos-6-x86-minimal.t ...

Understanding Docker What is Docker? Docker is an open-source platform designed for developing, shipping, and running applications. It enables users to separate infrastructure components from applications, creating smaller granular units called containers, which accelerates software delivery speed. While Docker containers share similarities wit ...

What is a Pod? A Pod is the smallest deployable unit in Kubernetes, representing a single instance of a running process within a cluster. It acts as a wrapper for one or more application containers. Pod Deployment Models Two primary models exist for deploying applications within Pods: Single-container Pod: The most common pattern, where a sing ...

Simple string combinations can produce remarkable results. This holds true for regular expressions and the cron scheduling system alike. Both appear deceptively straightforward, yet improper usage can lead to amusing—or disastrous—outcomes. For instance, I once attempted to schedule a task to run every four hours and wrote the following express ...

Ansible is a Python-based automation tool that enables parallel execution of tasks across remote systems without requiring agents on managed nodes. Communication occurs over SSH, and no additional servcies need to be running on either control or managed nodes. Prerequisites Generate SSH Key Pair Clear the known_hosts file to avoid host key conf ...

Cloud-native architectures rely heavily on ConfigMaps and Secrets for externalizing application settings. However, modifying these resources does not inherently propagate changes to running containers. Environment variables injected via env remain static until a pod restart. File-based mounts eventually reflect updates but often introduce sligh ...

Overview Maintaining API documentation can be a repetitive task. Using apidoc, you can generate documentation directly from comments within your source code. This approach is non-intrusive and supports multiple languages including Java, Python, Go, PHP, and JavaScript. By integrating it with version control and a web server, you can ensure that ...

System Baseline & Environment Hardening Before deploying the monitoring stack, ensure the operating environment meets minimum requirements and security baselines. Synchronize system clocks, disable interference services, and verify network reachability. # Verify release version and kernel architecture cat /etc/redhat-release uname -r # Tem ...

Docker Installation on Ubuntu This guide covers two methods for installing Docker Engine on Ubuntu systems: the automated script approach and the manual repository configuration. Method 1: Automated Installation Script The fastest way to install Docker is using the official convenience script with a mirror for better download speeds: curl -fsSL ...