How can I set up a multi-stage Docker build in Travis CI?
To set up a multi-stage Docker build in Travis CI, you need to define your Dockerfile with multiple stages and then configure your .travis.yml file to build the image.
What does a sample Dockerfile look like for multi-stage builds?
A sample Dockerfile might look like this:
# First stage: build the application
FROM node:14 AS builder
WORKDIR /app
COPY package.json .
RUN npm install
COPY . .
RUN npm run build
# Second stage: serve the application
FROM nginx:alpine
COPY --from=builder /app/build /usr/share/nginx/html
How do I configure the .travis.yml file for this setup?
Your .travis.yml file should include:
language: generic
services:
- docker
before_script:
- docker build -t my-app .
script:
- docker run my-app
Can I use caching to speed up the build process?
Yes, you can use Docker layer caching in Travis CI to speed up your builds by caching the layers that don't change often.
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