Hands‑on DevOps operations using Docker, K8s, Jenkins, and Ansible—empowering ops professionals to grow together through sharing, discussion, knowledge consolidation, and continuous improvement.
This guide explains how to create and enable an rc‑local startup script on Ubuntu by inspecting the rc‑local.service unit, creating /etc/rc.local, setting execution permissions, and enabling the service with systemctl so custom commands run automatically at boot.
This Bash script automates key‑based SSH authentication across multiple hosts by scanning a subnet, generating a key pair, installing sshpass, copying the public key and known_hosts file to each reachable machine, and ensuring password‑less login for subsequent connections.
This article provides a complete Bash script that automates downloading, extracting, configuring, and starting MongoDB on Linux systems, handling OS detection, prerequisite installation, file preparation, and color‑coded status messages for success, failure, and warnings.
This article presents a Python script that retrieves a domain's SSL certificate information, parses its start and expiration dates, converts them to datetime objects, and calculates the remaining days until the certificate expires, providing a simple command‑line tool for monitoring certificate validity.
This article presents a detailed multi‑phase Linux learning curriculum, covering environment setup, basic and advanced command usage, system services, security, monitoring, high‑availability clustering, virtualization, containerization, cloud platforms, and provides extensive recommended reading links for further study.
This article presents a comprehensive outline of a TCP/IP protocol stack course, covering Wireshark analysis basics, TCP/IP overview, Ethernet, ARP (including proxy, gratuitous, inverse, and reverse ARP), ICMP (ping, traceroute, various unreachable messages), UDP, DHCP (address request, renewal, release, conflict, relay), and related experimental validations.
This extensive series of 50 video lessons covers fundamental and advanced topics such as technology selection, capacity planning, micro‑service design, database scaling, caching strategies, load balancing, decoupling, layering, and service mesh, providing engineers with the knowledge needed to become proficient architects.
This article provides two Bash scripts: one that recursively renames all ".sh" files to ".shell" and deletes their second line, and another that repeatedly checks the top‑20 IPs on port 80, reports activity when the smallest request count exceeds 500, or retries after 600 seconds.
This article provides two Bash scripts: one that continuously displays inbound and outbound traffic of a specified network interface, and another that remotely checks disk usage on up to 100 servers, issuing warnings when partitions exceed a defined threshold.
This article provides step-by-step Bash scripts for automating daily MySQL database backups, compressing tables, cleaning old archives, and configuring master‑master replication, including detailed commands for dumping databases, creating tar.gz packages, and setting up replication parameters on Linux servers.
