Field notes for Linux, Cloud & DevOps
In-depth, production-tested guides covering everything from Linux internals to cloud architecture, CI/CD pipelines, monitoring, and application security — written from real infrastructure work, not theory.
13
In-depth guides
100%
Real commands
17
Sections each
Explore by Technology
Linux
Filesystem hierarchy, permissions, users & groups, systemd, journald, cron, networking, SSH hardening, disk management, LVM, and RHCSA exam tips.
Docker
Containers, images, volumes, networks, Dockerfiles, Compose stacks, private registries, and the troubleshooting playbook for production containers.
Git
Git internals, branching, merging, rebasing, cherry-picking, stashing, resetting, reverting, tagging, Git Flow, and resolving merge conflicts for real.
AWS
IAM, EC2, S3, Route53, CloudFront, ACM, RDS, CloudWatch, VPC, ALB, and Security Groups — with real deployment architectures and interview questions.
Jenkins
Installation, declarative pipelines, agents, credentials, GitHub/Bitbucket webhooks, deployment stages, and pipeline troubleshooting.
Ansible
Inventory files, playbooks, variables, roles, handlers, Ansible Vault, and real-world playbooks for hardening and deploying servers at scale.
Cloudflare
DNS management, SSL/TLS modes, caching rules, firewall, WAF, rate limiting, page rules, origin certificates, and Cloudflare Tunnel.
Bitbucket
Repository setup, Bitbucket Pipelines YAML, branching permissions, pull requests, and deployment stages to servers and cloud targets.
SonarQube
Installation, quality profiles, quality gates, scanner configuration for multiple languages, and wiring SonarQube into a CI/CD pipeline.
cPanel
Account management, email configuration, backups, SSL, DNS zones, PHP versions, and MySQL administration through cPanel/WHM.
Nagios
Nagios Core installation, NRPE agent setup, host and service checks, notification/escalation rules, and the commands you'll run daily.
OWASP
SQL injection, XSS, CSRF, RCE, and the rest of the OWASP Top 10 — with vulnerable/fixed code examples and the security headers that stop them.
Wazuh
Wazuh manager/indexer/dashboard architecture, agent deployment, custom detection rules, alert tuning, and the operational dashboard workflow.
Latest Articles
Wazuh: SIEM Architecture, Agents & Detection Rules
Wazuh manager/indexer/dashboard architecture, agent deployment, custom detection rules, alert tuning, and the operational dashboard workflow.
OWASP Top 10: Vulnerabilities, Exploits & Fixes
SQL injection, XSS, CSRF, RCE, and the rest of the OWASP Top 10 — with vulnerable/fixed code examples and the security headers that stop them.
Bitbucket: Repositories, Pipelines & Deployments
Repository setup, Bitbucket Pipelines YAML, branching permissions, pull requests, and deployment stages to servers and cloud targets.
Popular Articles
Linux Administration: The Complete Field Guide
Filesystem hierarchy, permissions, users & groups, systemd, journald, cron, networking, SSH hardening, disk management, LVM, and RHCSA exam tips.
Docker in Production: Images, Volumes, Networks & Compose
Containers, images, volumes, networks, Dockerfiles, Compose stacks, private registries, and the troubleshooting playbook for production containers.
Git Mastery: Branching, Rebasing & GitHub Workflows
Git internals, branching, merging, rebasing, cherry-picking, stashing, resetting, reverting, tagging, Git Flow, and resolving merge conflicts for real.
Recently Updated
Linux Administration: The Complete Field Guide
Filesystem hierarchy, permissions, users & groups, systemd, journald, cron, networking, SSH hardening, disk management, LVM, and RHCSA exam tips.
Cloudflare: DNS, SSL, Caching, WAF & Tunnels
DNS management, SSL/TLS modes, caching rules, firewall, WAF, rate limiting, page rules, origin certificates, and Cloudflare Tunnel.
Docker in Production: Images, Volumes, Networks & Compose
Containers, images, volumes, networks, Dockerfiles, Compose stacks, private registries, and the troubleshooting playbook for production containers.
All Articles
13 of 13 articles
Linux Administration: The Complete Field Guide
Filesystem hierarchy, permissions, users & groups, systemd, journald, cron, networking, SSH hardening, disk management, LVM, and RHCSA exam tips.
Docker in Production: Images, Volumes, Networks & Compose
Containers, images, volumes, networks, Dockerfiles, Compose stacks, private registries, and the troubleshooting playbook for production containers.
Git Mastery: Branching, Rebasing & GitHub Workflows
Git internals, branching, merging, rebasing, cherry-picking, stashing, resetting, reverting, tagging, Git Flow, and resolving merge conflicts for real.
AWS for DevOps: IAM, EC2, VPC, S3 & Deployment Patterns
IAM, EC2, S3, Route53, CloudFront, ACM, RDS, CloudWatch, VPC, ALB, and Security Groups — with real deployment architectures and interview questions.
Jenkins CI/CD: Pipelines, Agents & Deployments
Installation, declarative pipelines, agents, credentials, GitHub/Bitbucket webhooks, deployment stages, and pipeline troubleshooting.
Ansible Automation: Inventory, Playbooks & Roles
Inventory files, playbooks, variables, roles, handlers, Ansible Vault, and real-world playbooks for hardening and deploying servers at scale.
Cloudflare: DNS, SSL, Caching, WAF & Tunnels
DNS management, SSL/TLS modes, caching rules, firewall, WAF, rate limiting, page rules, origin certificates, and Cloudflare Tunnel.
Bitbucket: Repositories, Pipelines & Deployments
Repository setup, Bitbucket Pipelines YAML, branching permissions, pull requests, and deployment stages to servers and cloud targets.
SonarQube: Quality Gates & CI Integration
Installation, quality profiles, quality gates, scanner configuration for multiple languages, and wiring SonarQube into a CI/CD pipeline.
cPanel & WHM: Accounts, Email, DNS & Troubleshooting
Account management, email configuration, backups, SSL, DNS zones, PHP versions, and MySQL administration through cPanel/WHM.
Nagios Monitoring: NRPE, Checks & Alerting
Nagios Core installation, NRPE agent setup, host and service checks, notification/escalation rules, and the commands you'll run daily.
OWASP Top 10: Vulnerabilities, Exploits & Fixes
SQL injection, XSS, CSRF, RCE, and the rest of the OWASP Top 10 — with vulnerable/fixed code examples and the security headers that stop them.
Wazuh: SIEM Architecture, Agents & Detection Rules
Wazuh manager/indexer/dashboard architecture, agent deployment, custom detection rules, alert tuning, and the operational dashboard workflow.