Cache bust JavaScript, CSS or other file in Dockerfile

If you have an application without a build system, but need to cache bust a js file, this will do the trick

FROM nginx:1

COPY --chown=nginx:nginx html/ /usr/share/nginx/html


# Cache bust js file by appending date to scan.js file
RUN sed -i "s/scan.js/scan.js?a=$(date '+%Y%m%d%H%M')/g" /usr/share/nginx/html/index.html

ENTRYPOINT ["nginx", "-g", "daemon off;"]
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About Matt Busche

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Des Moines, IA