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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
Aug 9
Top 20 Linux networking commands explained with examples!

A Thread 👇 Image
1⃣ ifconfig: Displays network interface configuration.

For example,
ifconfig eth0

shows the configuration details of the Ethernet interface. #LinuxNetworkingExample
2⃣ ip: Versatile command to manage network interfaces, addresses, and routes.

For instance,
ip addr show

displays IP addresses assigned to all interfaces. #LinuxNetworkingExample
Read 23 tweets
Rakesh Jain Profile picture
Aug 7
Understanding sudo, su, su - and sudo su !

A Thread with examples 👇 Image
1/8 🐦 Welcome to today's thread!

Let's dive into the world of user privileges on Linux systems. We'll explore the differences between sudo, su, and sudo su.

#Linux #UserPrivileges
2/8 🐦 First up, sudo!

sudo stands for "Superuser Do." It allows regular users to perform administrative tasks by temporarily gaining root (superuser) privileges. Just add "sudo" before a cmd to execute it with elevated privileges. eg: sudo apt-get update updates packages.
Read 23 tweets
Rakesh Jain Profile picture
Aug 5
Load Balancer vs Reverse Proxy vs API Gateway

A Thread 🧵 Image
1/ 💡 Let's dive into the world of networking and infrastructure components: Load Balancer, Reverse Proxy, and API Gateway.

They play distinct roles in managing web traffic.
2/ 🔄 Reverse Proxy:
A reverse proxy is like a middleman between clients and servers. It handles requests on behalf of servers, often providing benefits like security, load balancing, and caching.

Example: Nginx, Apache.
Read 26 tweets
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

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