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Rakesh Jain Profile picture
@devops_tech
Sep 16, 2021 • 22 tweets • 6 min read • Read on X
Scrolly
Collection of Cheat Sheets:

Linux Commands, Networking Tools, Hacking Tools, Docker, Kubernetes, AWS etc.

#Linux #infosec #DevOps #cheatsheet

A Thread. (Will continue to add more)
Linux Commands Cheat Sheet Image
Systemctl Commands Cheat Sheet Image
IP Command Cheat Sheet Image
RPM Command Cheat Sheet Image
Grep Command Cheat Sheet Image
IP Header Image
Wireshark Cheat Sheet Image
NMAP Cheat Sheet Image
Hacking Tools Cheat Sheet - 1

IP, dig, ncat, openssl, arpspoof, tcpdump, nmap Image
Hacking Tools Cheat Sheet - 2
ncrack, curl, hashcat, metasploit, Image
Docker Cheat Sheet - 1 Image
Docker Cheat Sheet - 2 Image
Kubernetes Cheat Sheet - 1 Image
Kubernetes Cheat Sheet - 2 Image
Kubernetes Cheat Sheet - 3 Image
AWS Basics Cheat Sheet Image
Sed Cheat Sheet Image
AWK Cheat Sheet Image
find Cheat Sheet Image
Sort and Uniq Cheat Sheet Image
Grep Cheat Sheet Image

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More from @devops_tech

Rakesh Jain Profile picture
Sep 12
AWS service limitations to keep in mind!

A List of critical #AWS services and their limitations 👇 Image
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.
5. IAM – Max 5,000 roles per account, policy size limits.
6. Lambda – Max execution timeout of 15 minutes, memory max 10GB.
7. DynamoDB – Partition throughput limits, item size max of 400KB.
8. CloudFormation – 200 resources limit per stack.
Read 13 tweets
Rakesh Jain Profile picture
Sep 9
Mastering Ansible command line!

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

Command:
ansible --version

Explanation:
Verify your Ansible installation and check version details.
2️⃣ Ping All Hosts

Command:
ansible all -m ping

Explanation:
Ping all hosts in your inventory to ensure they are reachable.
Read 18 tweets
Rakesh Jain Profile picture
Sep 5
🧵 Mastering Docker Troubleshooting: 15 Key Tips for Developers and DevOps Engineers!

A Thread 👇👇 Image
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.
2/ 🔍 Inspect Logs
Run docker logs <container_name> to see the container logs.
This helps troubleshoot crashes, errors, or other issues within the app or service.
Read 18 tweets
Rakesh Jain Profile picture
Sep 3
🧵 Mastering Dockerfile: A Breakdown of 15 most important Parameters!

A thread 👇👇 Image
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.
2️⃣ LABEL:
Adds metadata to the image, such as author or version.

LABEL maintainer="you@example.com" - Tags the image with your contact info.
Read 18 tweets
Rakesh Jain Profile picture
Aug 30
🧵 Kubernetes Security Master Guide! 🔐 Image
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
2️⃣ Network Policies

🌐 Control traffic flow between pods using Network Policies. Limit communication to what's needed, reducing the attack surface.
Example: A policy that only allows inbound traffic from specific pods: Image
Read 18 tweets
Rakesh Jain Profile picture
Aug 25
🧵 Kubernetes Master Guide!

15 Must-Know Concepts with Examples! 🚀 Image
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. 🎶
2️⃣ Nodes & Clusters:
A Cluster is like a city, with Nodes as buildings. The Master node is City Hall 🏛️, directing Worker nodes (buildings) 🏢 that run containers (apps).

Example: The cluster ensures all apps have power and connectivity! ⚡
Read 18 tweets

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