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Rakesh Jain

@devops_tech

Jun 30

🧵 10 Things Every DevSecOps Engineer Must Know About Kubernetes Security — with real examples 👇

1/
🔐 RBAC > cluster-admin
Grant access based on roles, not titles.
✅ Example: Allow devs to view pods only:

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

@devops_tech

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

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

@devops_tech

Mar 26

🐧 AWK Master Cheat Sheet: 15 Must-Know Commands for DevOps & Linux Admins 🖥️

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

@devops_tech

Mar 24

🚀 7-Day Docker Learning Series – Day 7: Docker Security Best Practices 🛡️

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

@devops_tech

Mar 22

🚀 7-Day Docker Learning Series – Day 6: Docker Compose – Managing Multi-Container Applications 🛠️

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

Rakesh Jain

@devops_tech

Mar 21

🚀 7-Day Docker Learning Series – Day 5: Docker Networking – Connecting Containers 🌐

Welcome to Day 5 of our Docker Learning Series! Today, we’ll dive into Docker Networking, how containers communicate, and different network types.

🔹 Why is Docker Networking Important?

🧵👇 (Thread)

1️⃣ What is Docker Networking? 🌐

Docker provides a networking system that allows containers to communicate with each other or with the outside world.

Read 20 tweets

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