Modify the existing file. Add the stage name after the as keyword.
FROM node:13.12.0-alpine as builder
By changing this line above, we told Docker that this image is a stage. We will be able to reference it in other stages. We can copy specific files and folders from this image with the command COPY —from*=<stage_name>. Our Multi staging Dockerfile is starting to take shape. We need to add the Nginx stage, and we are done.
### Add to your existing Dockerfile
...
# ------------------------------------------------------
# Production Build
# ------------------------------------------------------
FROM nginx
COPY nginx.conf /etc/nginx/conf.d/default.conf
COPY --from=builder /app/build /usr/share/nginx/html
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The COPY --from=builder tells Docker to precisely copy the files inside the /app/build/folder inside our Nginx container.
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