🧵 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 🔐

🐧 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.

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

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.

🧵 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! 🖥️👊

🐧 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

Platform Engineer vs. SRE vs. DevOps Engineer!

A Thread 🧵 1/ What’s the difference? 🤔
All these roles focus on improving software delivery and reliability but have different goals. Here’s a quick breakdown:

AWS service limitations to keep in mind!

A List of critical #AWS services and their limitations 👇 1. EC2 – Instance limits by region, instance type restrictions.
2. RDS – Max database storage limits, instance size restrictions.
3. S3 – Max object size is 5TB, bucket policies can limit access.
4. EBS – Volume size max of 64TB, 20,000 IOPS for io1/io2 volumes.

Mastering Ansible command line!

A Thread of 10 key #Ansible commands and concepts all #DevOps and #Linux Administrators should focus on 👇👇 1️⃣ Check Ansible Version

Command:
ansible --version

Explanation:
Verify your Ansible installation and check version details.

🧵 Mastering Docker Troubleshooting: 15 Key Tips for Developers and DevOps Engineers!

A Thread 👇👇 1/ 🐳 Check Container Status
Use docker ps -a to view all containers and their statuses. A container may have exited unexpectedly.
Look at STATUS and RESTART policies to identify potential issues.

🧵 Mastering Dockerfile: A Breakdown of 15 most important Parameters!

A thread 👇👇 1️⃣ FROM:
The first instruction in any Dockerfile. It defines the base image for subsequent instructions.

FROM ubuntu:20.04 - Starts with an Ubuntu 20.04 image.

🧵 Kubernetes Security Master Guide! 🔐 1️⃣ Role-Based Access Control (RBAC)

📜 Limit access with RBAC! Define who can do what in your cluster by setting up roles and bindings. Keep permissions tight!

Example:
kubectl create rolebinding developer --clusterrole=edit --user=dev@example.com -n dev-namespace

🧵 Kubernetes Master Guide!

15 Must-Know Concepts with Examples! 🚀 1️⃣ Kubernetes Overview:
K8s is like the conductor of an orchestra, managing containerized apps across multiple machines. 🎻

Example: You have a web app, API, and database, all in different containers—K8s ensures they play in harmony. 🎶

🧵 Docker Master Guide!

15 Must-Know Concepts with Examples! 1️⃣ Containers vs. VMs
Containers are lightweight & share the host OS, while VMs are heavier, with separate OS instances.

Example:
Container: 10 MB
VM: 1 GB
Save resources with Docker containers!

Typical Tasks for #DevOps or #Cloud Infrastructure Admins Using #Terraform!

A thread 👇 A DevOps or cloud infra admin typically uses Terraform to manage & automate the provisioning of infrastructure. Their responsibilities with Terraform often include tasks that are more operational & infrastructure-focused, distinct from the development or QA tasks.

15 Advanced Linux Commands Explained Simply! 🌟

A Thread 🧵 👇 1️⃣ grep
Searches for text within files.

Example: grep "hello" file.txt
🔍 Finds the word "hello" in "file.txt" and shows the line where it appears.

Advanced Ansible Guide 🛠️

#Ansible #DevOps 🔐 Using Ansible Vault:

Encrypt sensitive data for enhanced security. Ansible Vault helps protect your secrets like passwords and API keys. 🛡️ #Ansible #DevSecOps

Example:
ansible-vault encrypt_string 'my_secret_password' --name 'my_var'

10 Tips To Improve Container Security 🔐

#docker #containers #security 1/11 🔒 Use Official Images

Always use official, trusted container images from reputable sources to minimize vulnerabilities. Check image signatures to ensure authenticity. #ContainerSecurity #DevSecOps

Ansible Guide!

Easy Understanding Concepts of Ansible for beginner! 1/20 🧵✨ Let's dive into Ansible, your friendly automation tool! Whether you're a beginner or just need a refresher, this thread is for you! 🚀 #Ansible #DevOps

Terraform Guide!

Easy Understanding Concepts of Terraform for beginners 👇 1️⃣ 🌍🚀 Welcome to the ultimate Terraform guide for beginners! Let's dive into the world of Infrastructure as Code (IaC) and make your cloud deployments a breeze. #Terraform #DevOps

Linux Guide!

A thread explaining Basic to Advanced Linux concept! 🧵 1/20: 🚀 Welcome to Basic to Advanced Linux Concepts! Let's dive deeper into the powerful features and capabilities of Linux. #Linux #AdvancedLinux