“I Got Docker Exit 127 😳 Then THIS Saved Me in 60 Seconds!”

Описание: 🚀 Your Docker container starts… and instantly dies?
Don’t worry — you’re not cursed. It’s just your ENTRYPOINT or CMD having a meltdown.
In this video, Lily panics, Alice diagnoses, and together they fix a container that refuses to even stay alive for one second.
Welcome back to MiniOps — making DevOps fun again!
🔍 What you’ll learn in this video
In this step-by-step breakdown, we cover:
✅ 1. Why a container starts and dies instantly
• Broken ENTRYPOINT
• Wrong CMD
• Missing scripts
• Incorrect file paths
• Executable permissions
• Exit code 127 (command not found)
✅ 2. How to check crashed containers
Using docker ps -a to see containers that died immediately.
✅ 3. How to read the container’s last error message
Using docker logs container to catch the exact cause.
✅ 4. How to bypass a broken entrypoint
Using:
Copy code
Bash
docker run -it --entrypoint /bin/sh image
This lets you get inside a container even when its startup command fails.
✅ 5. How to test and fix the script manually
• Run the entrypoint by hand
• Validate paths
• Ensure the script exists
• Make it executable
• Update the Dockerfile accordingly
✅ 6. How to rebuild and run the fixed image
We walk through the full rebuild → rerun → verify cycle so your container actually stays alive.
🧰 Commands Used in This Video
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Bash
docker ps -a
docker logs container
docker run -it --entrypoint /bin/sh image
inside container:
./start.sh
docker build -t myapp:latest .
docker run -d --name myapp_container myapp:latest
🧠 Why this video matters
If you’re learning Docker for DevOps, Kubernetes, or microservices, you WILL run into containers that refuse to start.
Mastering logs, entrypoints, and debugging saves hours of guesswork.
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If this made you go “OHHH that’s why my container was dying,”
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