File Permissions in Docker Images

Set correct permissions for files copied into Docker containers.

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Octal (editable)

rwxr-xr-x

Symbolic

Command

$ chmod 755 filename

Common presets

Docker tips

🐳

COPY in a Dockerfile preserves permissions. Use chmod in a RUN step (or COPY --chmod=755) so entrypoint scripts are executable.

💡

Running as a non-root user? Make sure app files are readable (and writable where needed) by that user's UID/GID.

🎯

Entrypoint and healthcheck scripts need the execute bit (755) or the container will fail to start.

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