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Rakesh Jain Profile picture
@devops_tech
Sep 13, 2021 • 14 tweets • 21 min read • Read on X
List of all my Linux Series Articles.

A thread.

#DevOps #cloud #Automation #Linux #Ubuntu #CentOS
1. Why Linux?

#DevOps #cloud #Automation #Linux #Ubuntu #CentOS

blog.learncodeonline.in/why-linux
2. Automating Linux Installation using Vagrant and VirtualBox

#DevOps #cloud #Automation #Linux #Ubuntu #CentOS

blog.learncodeonline.in/automating-lin…
3. Linux Directory Structure Explained!

#DevOps #cloud #Automation #Linux #Ubuntu #CentOS

blog.learncodeonline.in/linux-director…
4. Linux Access Management: Beginner to Advanced

#DevOps #cloud #Automation #Linux #Ubuntu #CentOS

blog.learncodeonline.in/linux-access-m…
5. Understanding Linux File Systems - EXT4, XFS, BTRFS

#DevOps #cloud #Automation #Linux #Ubuntu #CentOS

blog.learncodeonline.in/understanding-…
6. A complete guide to Manage Users and Groups on Linux!

#DevOps #cloud #Automation #Linux #Ubuntu #CentOS

blog.learncodeonline.in/a-complete-gui…
7. Repository and Package Management on Linux

#DevOps #cloud #Automation #Linux #Ubuntu #CentOS

blog.learncodeonline.in/repository-and…
8. Networking in Linux

#DevOps #cloud #Automation #Linux #Ubuntu #CentOS

blog.learncodeonline.in/networking-in-…
9. Linux Advanced - Environment Variables in Linux

#DevOps #cloud #Automation #Linux #Ubuntu #CentOS

blog.learncodeonline.in/linux-advanced…
10. Linux Advanced - Input Output Redirection and Piping

#DevOps #cloud #Automation #Linux #Ubuntu #CentOS

blog.learncodeonline.in/linux-advanced…
11. Linux Advanced - Process Management

#DevOps #cloud #Automation #Linux #Ubuntu #CentOS

blog.learncodeonline.in/linux-advanced…
12. Linux Advanced - Job Scheduling

#DevOps #cloud #Automation #Linux #Ubuntu #CentOS

blog.learncodeonline.in/linux-advanced…
13. Linux Advanced - How to SECURE your Linux Server!

#DevOps #cloud #Automation #Linux #Ubuntu #CentOS #security

blog.learncodeonline.in/linux-advanced…

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More from @devops_tech

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
Rakesh Jain Profile picture
Mar 21
🚀 7-Day Docker Learning Series – Day 5: Docker Networking – Connecting Containers 🌐 Image
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
Rakesh Jain Profile picture
Mar 18
🚀 7-Day Docker Learning Series – Day 4: Docker Volumes – Managing Data in Containers 📦

Welcome to Day 4 of our Docker Learning Series! Today, we’ll learn how Docker handles data using volumes. Image
🔹 Why Do We Need Docker Volumes?

🧵👇 (Thread)
1️⃣ What Happens to Data in Containers? ❌

By default, when a container is deleted, all its data is lost!
To persist data outside the container, we use Docker Volumes.
Read 15 tweets

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