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define port in environment variable

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Jeddunk 2021-01-17 20:29:27 +01:00
parent dd183a3b42
commit 04525df9fa
1 changed files with 3 additions and 1 deletions
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@ -1,3 +1,5 @@
ARG PORT=3000
ENV PORT=$PORT
# Use the official lightweight Node.js 12 image.
# https://hub.docker.com/_/node
FROM node:12-alpine
@ -11,6 +13,6 @@ COPY / ./
RUN npm install
# Compile to production
RUN npm run build
EXPOSE 3000
EXPOSE ${PORT}
# Run the web service on container startup.
CMD [ "npm", "start" ]