Software⏱️ 2 min read📅 2026-06-03
How to Fix: Docker : exec /usr/bin/sh: exec format error
Docker exec format error in CI/CD pipeline
Quick Answer: The issue is likely due to the Docker image not being compatible with the Python version installed. Try using a different base image that supports Python 3, such as Ubuntu:20.04-buster or Ubuntu:20.04-focal.
📋 Table of Contents
The Docker exec format error occurs when the system is unable to determine the correct format of an executable file. In this case, the issue arises from the fact that the Docker image uses a different format for the shell than the one used in the CI/CD pipeline.
🛑 Root Causes of the Error
- The Docker image uses a different format for the shell than the one used in the CI/CD pipeline.
🛠️ Step-by-Step Verified Fixes
Method 1: Change the Shell Format in Dockerfile
- Step 1: Update the Dockerfile to use a specific shell format, such as '/bin/sh' instead of 'sh'. The updated Dockerfile would look like this:
Updated Dockerfile
FROM ubuntu:20.04
/bin/sh -c ❓ Frequently Asked Questions
The Docker image uses a different format for the shell than the one used in the CI/CD pipeline.
Step 1: Update the Dockerfile to use a specific shell format, such as '/bin/sh' instead of 'sh'. The updated Dockerfile would look like this:
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