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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 8

Docker Interview Guide!

A thread with 20+ mid-level to advanced Docker interview questions and answers 🐳

1/ What is a Docker Compose, and why is it useful? 🚢

A. Docker Compose is a tool for defining and running multi-container Docker applications. It's useful for managing complex applications with multiple services, enabling easy orchestration. #Docker #Interview

2/ What is Docker Swarm, & how does it differ from Kubernetes? 🐝

A. Docker Swarm is Docker's native orchestration tool for managing clusters of Docker hosts. Kubernetes is a more robust orchestration system that can manage containers from different providers. #Docker #Interview

Read 31 tweets

Rakesh Jain

@devops_tech

Mar 6

Kubernetes Interview Guide!

A thread with 20+ mid-level to advanced Kubernetes interview questions with concise answers 🚢📷 📷👇

1/ 🚀 Q: What is Kubernetes and why is it essential for container orchestration?

A: Kubernetes is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications, ensuring high availability and reliability.

2/ 🛠️ Q: Name the key components of a Kubernetes cluster.

A: A Kubernetes cluster consists of the Master (API Server, Controller Manager, Scheduler, etcd) and Nodes (where containers run). #Kubernetes #Interview

Read 32 tweets

Rakesh Jain

@devops_tech

Jan 3

🧵 How to Start Learning Linux for DevOps Aspirants 🚀🐧

From newbie to pro in no time!
Let’s make Linux your ultimate superpower. 🦸‍♂️🦸‍♀️

1/ Start with the Basics 🛠️✨
• Discover Linux distros: Ubuntu 🟣, CentOS 🔵, Red Hat 🔴.
• Set up Linux in a VM (VirtualBox/VMware 💻).
• Get cozy with the terminal – your new BFF! 🖥️👊

2/ Master Essential Commands 🎯
Get hands-on with:
• 📂 Navigation: ls, cd, pwd
• 🛠️ File ops: cp, mv, rm
• 🔎 Search: find, grep, locate
• 🔑 Permissions: chmod, chown

Pro tip: Always consult the man pages (man <command>). 🤓📜

Read 18 tweets

Rakesh Jain

@devops_tech

Dec 6, 2024

🐧 Linux Networking Commands: 10 Daily-Used Examples (Thread) 🧵

1/ ifconfig (Deprecated: Use ip):
Check & configure network interfaces.

ifconfig eth0 up # Enable interface
ifconfig eth0 down # Disable interface

Use ip instead:
ip addr show eth0
ip link set eth0 up

#LinuxNetworking #SysAdmin

2/ ip (Modern Network Management):
Powerful alternative to ifconfig.

ip a # Show IP addresses
ip route # Display routing table
ip link set eth0 up # Enable interface

Read 13 tweets

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