Install node modules before copying over your working code so that node_modules are built (and cached) before you change your service code!
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| # ... | |
| ADD package.json /tmp/package.json | |
| RUN cd /tmp && npm install && \ | |
| mkdir -p /opt/app && cp -a /tmp/node_modules /opt/app/ | |
| # ... | |
| WORKDIR /opt/app | |
| ADD . /opt/app |
For those like myself who were initially bewildered by this, the "Build cache" section of the Dockerfile best practices doc may help fill in the gaps.
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If the package.json file changes then Docker will re-run the npm install sequence... otherwise our modules are cached so we aren't rebuilding them every time we change our apps source code!