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Rakesh Jain Profile picture
@devops_tech
Sep 16, 2021 • 22 tweets • 6 min read • Read on X
Scrolly
Collection of Cheat Sheets:

Linux Commands, Networking Tools, Hacking Tools, Docker, Kubernetes, AWS etc.

#Linux #infosec #DevOps #cheatsheet

A Thread. (Will continue to add more)
Linux Commands Cheat Sheet Image
Systemctl Commands Cheat Sheet Image
IP Command Cheat Sheet Image
RPM Command Cheat Sheet Image
Grep Command Cheat Sheet Image
IP Header Image
Wireshark Cheat Sheet Image
NMAP Cheat Sheet Image
Hacking Tools Cheat Sheet - 1

IP, dig, ncat, openssl, arpspoof, tcpdump, nmap Image
Hacking Tools Cheat Sheet - 2
ncrack, curl, hashcat, metasploit, Image
Docker Cheat Sheet - 1 Image
Docker Cheat Sheet - 2 Image
Kubernetes Cheat Sheet - 1 Image
Kubernetes Cheat Sheet - 2 Image
Kubernetes Cheat Sheet - 3 Image
AWS Basics Cheat Sheet Image
Sed Cheat Sheet Image
AWK Cheat Sheet Image
find Cheat Sheet Image
Sort and Uniq Cheat Sheet Image
Grep Cheat Sheet Image

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More from @devops_tech

Rakesh Jain Profile picture
Jul 25
All possible reasons a Kubernetes Pod can go into CrashLoopBackOff 🧵👇 PS: https://sysdig.com/wp-content/uploads/What-is-Crashloopbackoff-01.png
1/🧵 What causes a Kubernetes Pod to go into CrashLoopBackOff?
Here’s a deep-dive thread on ALL the possible reasons and how to fix them. 🚑🐳
#Kubernetes #DevOps #CrashLoopBackOff
2/ Container Exit Code != 0
Your container crashed due to an error in the app.

🛠️ Fix: Check logs with kubectl logs <pod> and fix code/config causing the error.
Read 36 tweets
Rakesh Jain Profile picture
Jun 30
🧵 10 Things Every DevSecOps Engineer Must Know About Kubernetes Security — with real examples 👇 Image
1/
 🔐 RBAC > cluster-admin
Grant access based on roles, not titles.
✅ Example: Allow devs to view pods only: Image
2/
 🕵️ Enable Audit Logs
Track who deleted a service or changed a config.

✅ Example: Enable auditing via kube-apiserver:
--audit-log-path=/var/log/k8s-audit.log
Read 18 tweets
Rakesh Jain Profile picture
May 5
🧵 Kubernetes Troubleshooting Series:

Scenario: Pod stuck in ImagePullBackOff or ErrImagePull?

Here’s a step-by-step thread to troubleshoot and fix it like a pro. 💡

#Kubernetes #DevOps #Containers Image
1/ Why does this happen?

When a pod can’t pull the container image, it may get stuck in ImagePullBackOff or ErrImagePull.

This commonly occurs due to:
- Private Docker registries 🏰
- Wrong image names/tags ❌
- Expired or missing imagePullSecrets 🔐
2/ Step 1 – Inspect Pod Events

Run:
kubectl describe pod <pod-name>

Check the Events section. Look for errors like:
- pull access denied
- manifest not found
- rpc error from daemon

These reveal the root cause.
Read 13 tweets
Rakesh Jain Profile picture
Mar 26
🐧 AWK Master Cheat Sheet: 15 Must-Know Commands for DevOps & Linux Admins 🖥️ Image
1️⃣ Basic Print

Print the first column of a file:
awk '{print $1}' file.txt

👉 Extracts and prints the first field from each line.
2️⃣ Print Specific Columns

Print columns 1 and 3 separated by -:
awk '{print $1 "-" $3}' file.txt

👉 Useful for structured data processing.
Read 18 tweets
Rakesh Jain Profile picture
Mar 24
🚀 7-Day Docker Learning Series – Day 7: Docker Security Best Practices 🛡️ Image
Welcome to the final day of our Docker Learning Series! Today, we’ll focus on Docker Security – essential for protecting your containers, images, and infrastructure.
🔹 Why is Docker Security Important?
• Containers share the host kernel 🖥️
• Misconfigurations can expose sensitive data 🛑
• Unverified images can introduce vulnerabilities ⚠️

🧵👇 (Thread)
Read 16 tweets
Rakesh Jain Profile picture
Mar 22
🚀 7-Day Docker Learning Series – Day 6: Docker Compose – Managing Multi-Container Applications 🛠️ Image
Welcome to Day 6 of our Docker Learning Series! Today, we’ll learn about Docker Compose, a powerful tool to define and manage multi-container applications using a simple YAML file.

🔹 Why Use Docker Compose?

🧵👇 (Thread)
1️⃣What is Docker Compose?📜

Docker Compose is a tool that allows you to define & run multi-container apps using a single YAML config file (docker-compose.yml).
✅ Helps manage complex applications
✅ Simplifies multi-container setups
✅ Automates container startup & networking
Read 14 tweets

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