Software⏱️ 2 min read📅 2026-06-02

How to Fix: ARG substitution in RUN command not working for Dockerfile

Fix ARG substitution in RUN command not working for Do. The issue is caused by the order of argu. Step-by-step guide included.

Quick Answer: The issue is caused by the order of arguments in the RUN command. Try rearranging them to use the substituted value first.

📋 Table of Contents

  1. 🚀 How to Resolve This Issue
  2. 💡 Conclusion

The issue you're facing is due to the fact that Docker doesn't support ARG substitution in RUN commands. This is because the RUN command executes immediately when building the image, and the ARG values are not available until the build process is complete.

🚀 How to Resolve This Issue

Method 1: Use a separate RUN command for ARG substitution

  1. Step 1: Create a separate RUN command that uses the ARG value.

Example:

ARG a-version RUN wget -q -O /tmp/alle.tar.gz http://someserver/server/$a-version/a-server-$a-version.tar.gz && \ mkdir /opt/apps/$a-version

💡 Conclusion

By using a separate RUN command, you can ensure that the ARG values are substituted correctly. This is the recommended approach when working with ARG substitution in Dockerfiles.

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