Bash Security
Command Injection: The #1 Bash Security Risk # DANGEROUS: user input concatenated directly into a command read -p "Enter filename: " …
Jan 20, 2026
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Security
14 articles
Linux Permissions
What Are Linux Permissions? Every file and directory carries three permission sets — for the owner, the group, and others — each with read …
Jan 20, 2026
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Users & Groups
What Are Users and Groups? Every process and file on Linux is owned by a user ID (UID) and a group ID (GID) — numbers, not names. Usernames …
Jan 20, 2026
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Kubernetes Secrets
📋 Table of Contents What is a Kubernetes Secret? Why Do We Need Secrets? How Kubernetes Secrets Work Internally Types of Kubernetes Secrets …
Jan 20, 2026
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Multi-Account Security Report — Assume Roles Across All Org Accounts
Problem Statement Your organization has 30 AWS accounts across dev, staging, and production environments. Your security team must verify …
Jan 20, 2025
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CloudTrail Root Account Monitor — Alert on Root API Usage via Lambda
Problem Statement The AWS root account bypasses all IAM policies and has unrestricted access to everything in the account — including …
Jan 20, 2025
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EC2 Instance Communicating with Malicious IP — Incident Response
The Problem A running EC2 instance may be compromised — malware installed, data being exfiltrated, or the instance being used as a pivot to …
Jan 20, 2025
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Security Group Audit — Find Unrestricted Inbound Rules (0.0.0.0/0)
Problem Statement A developer accidentally added 0.0.0.0/0 to a Security Group to “quickly test” SSH access. They forgot to …
Jan 20, 2025
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Generate Least-Privilege IAM Policy from CloudTrail Logs
Problem Statement Your application role has PowerUserAccess (5,000+ allowed actions), but in 30 days of production usage it only calls 12 …
Jan 20, 2025
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Developer Pushed AWS Credentials to Public GitHub — Incident Response
The Problem Leaked AWS credentials are one of the most dangerous security incidents. Attackers have automated scrapers that monitor GitHub …
Jan 20, 2025
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IAM Access Key Rotation — Auto-Rotate Keys Older than 90 Days
Problem Statement CIS AWS Benchmark 1.14 requires IAM access keys to be rotated every 90 days. Long-lived keys are a top attack vector — if …
Jan 20, 2025
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S3 Bucket Security Audit — Public Access, Versioning & Encryption
Problem Statement A misconfigured S3 bucket was the #1 cause of cloud data breaches in 2023. Common mistakes: public access not blocked, no …
Jan 20, 2025
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Linux Engineer Learning Path
Who Is This Path For? This path is for absolute beginners — you’ve never used a Linux terminal before, and that’s completely …
Jan 18, 2025
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Kubernetes Interview Questions & Answers — Networking & Security
Q1 What are the types of Kubernetes Services and when do you use each? Basic Ans: Pods come and go all the time - they crash, get replaced, …
Jan 1, 0001
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