Your team has just inherited a legacy Docker image with no docs.
No ports are exposed and the logs are unhelpful.
Right now, the application running inside the container is completely inaccessible.
Can you find and expose the port?
www.learnbyfixing.com/scenarios/21/
#LearnByFixing #Docker
A Docker container can't connect to its own DB, but why?
- DNS resolution?
- Network connectivity?
- Rootless Docker misconfig?
- Or all three at once?
Most container issues aren’t where you think they are.
www.learnbyfixing.com/scenarios/20/
#LearnByFixing #DevOps #SRE #Sysadmin #Docker
Most people don't fail at learning Linux troubleshooting… They just don't know what to learn next.
Check out this Linux Troubleshooting Roadmap if you want to:
- Improve your skills
- Stop jumping between random topics
- Follow a clear, practical path
www.learnbyfixing.com/roadmaps/lin...
New guide released: Signals in Docker
- Why PID 1 is important inside a container
- docker stop vs docker kill
- How to make containers shut down gracefully
- How to send signals to containers
www.learnbyfixing.com/guides/docke...
What is the most effective way to strengthen your troubleshooting skills?
Practice in real scenarios.
We’ve published a GitHub repository with descriptions of all our scenarios, allowing you to explore them and challenge yourself:
github.com/learnbyfixin...
New scenario released! 🚀
An app was set up locally using Docker Compose... but it doesn't start.
It has 3 services: proxy, app and database.
Can you make it work?
www.learnbyfixing.com/scenarios/19/
Happy fixing!
#LearnByFixing #DevOps #SRE #Sysadmin #Docker
New scenario released! 🚀
You tried to start a containerized app, but it doesn't run.
A colleague says it works on their laptop.
Can you make it run without changing the app's code?
www.learnbyfixing.com/scenarios/18/
Happy fixing!
#LearnByFixing #DevOps #SRE #Sysadmin #Docker
New scenario released! 🚀
A Docker image was built to deploy an app to production… but there’s a problem.
It's over 1 GB.
Your mission: optimize its size to be under 20 MB.
Can you fix it?
www.learnbyfixing.com/scenarios/17/
Happy fixing!
#LearnByFixing #DevOps #SRE #Sysadmin #Docker
🚀 Big Update: From Tutorials to Real Challenges
Our labs are now real challenges, featuring:
- A "Check Solution" button
- Optional hints if you get stuck
- Full solution reveal when you're ready
www.learnbyfixing.com
#LearnByFixing #DevOps #SRE #Sysadmin #Linux #Docker
Instant DevOps Labs: Hands-On & Free! 🚀
Get 15 minutes of real Linux environment practice with genuine scenarios.
No signup. No email. No credit card required.
www.learnbyfixing.com
#LearnByFixing #DevOps #SRE #Sysadmin #Linux #Docker
Scenario filter
New features are here! 🚀
We’ve just launched two highly requested improvements:
- Skill-level filtering in Scenarios
- Seamless access using your GitHub account
Ready to dive in and get hands-on? www.learnbyfixing.com/scenarios/
#LearnByFixing #DevOps #SRE #Sysadmin #Linux
Scenario description
New scenario released! 🚀
Reload the configuration of a containerized app without restarting the Docker container.
Sounds easy? Not so much when the container uses a distroless image.
www.learnbyfixing.com/scenarios/16/
Happy fixing!
#LearnByFixing #DevOps #SRE #Sysadmin #Docker
Docker logo
We have just expanded the Environment Variables guide to include their use in Docker containers:
www.learnbyfixing.com/guides/envir...
#LearnByFixing #Linux #DevOps #SRE #Sysadmin #Docker #Containers #EnvironmentVariables
Docker logo
New scenario released! 🚀
You have a verbose Docker container.
Your challenge: make it log ERROR messages only without modifying the image.
Sharpen your Docker skills and try it now:
www.learnbyfixing.com/scenarios/15/
Happy fixing!
#LearnByFixing #Linux #DevOps #SRE #Sysadmin #Docker #Containers
New free guide released! 🚀
Do you want to troubleshoot Linux like a pro? Our latest guide shows you how to inspect system calls using strace, a must-have tool for every SysAdmin, SRE and DevOps engineer.
www.learnbyfixing.com/guides/syste...
#LearnByFixing #Linux #DevOps #SRE #Sysadmin #strace
New scenario released! 🚀
In this scenario, you’ll learn how to:
- Identify which port a program needs to listen on.
- Track down the process that's already listening on that port.
www.learnbyfixing.com/scenarios/14/
Happy fixing!
#LearnByFixing #Linux #DevOps #SRE #Sysadmin #syscalls #strace
New scenario released! 🚀
Having the config file for a program is not enough. You also need to put it in the right place.
Check it out and level up your troubleshooting skills: www.learnbyfixing.com/scenarios/13/
Happy fixing!
#LearnByFixing #Linux #DevOps #SRE #Sysadmin #syscalls #strace
New scenario released! 🚀
www.learnbyfixing.com/scenarios/12/
Imagine you don't know how to quit vi / vim / neovim .
Figure out how to exit without using any vi commands.
Happy fixing!
#LearnByFixing #Linux #DevOps #SRE #Sysadmin #vi #vim #neovim
We are excited to announce the official launch of Learn by Fixing! 🚀
Ready to try it? www.learnbyfixing.com
Happy fixing!
#LearnByFixing #Linux #DevOps #SRE #Sysadmin
Diagram of a pipe
New guide released! 🚀
Learn how pipes work and how to connect commands using them.
www.learnbyfixing.com/guides/pipes/
#LearnByFixing #linux #DevOps #shell #pipes
🚀 New guide released!
Learn how to redirect input and output when running a program from the shell.
www.learnbyfixing.com/guides/shell...
#LearnByFixing #linux #shell
Scenario description
🚀 New scenario released!
All roads lead to Rome, but in Linux there is a single $PATH to find all programs.
👉 Come and learn all about it: www.learnbyfixing.com
#LearnByFixing #Linux #EnvironmentVariables #PATH
🚀 All our guides are now available for free!
🎯 These concise guides provide just the key insights you need to grasp each concept quickly.
👉 Start learning now: www.learnbyfixing.com/guides/
#LearnByFixing #Linux #DevOps #SRE #FreeLearning
🚀 New scenario released!
💡 Dive into Environment Variables in Linux.
🔧 Make the program in this scenario log only errors without changing its code.
👉 Try it now: www.learnbyfixing.com
#LearnByFixing #Linux #DevOps #EnvironmentVariables #EnvVars
📱Our labs are now more mobile-friendly!
✅ Redesigned UI
✅ Smoother navigation
✅ Easier to run commands & view outputs
Try them out now 👉 www.learnbyfixing.com
#LearnByFixing #Linux #DevOps #SRE #SysAdmin
🚀 We are happy to announce the beta version of Learn by Fixing!
www.learnbyfixing.com
Dive into our hands-on troubleshooting scenarios and help shape the platform with your feedback.
#LearnByFixing #Linux #DevOps #SRE #Troubleshooting