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yadi

Yet Another Docker Image repo

Collection of fine-tuned, production ready, multi-stage docker images for the major frameworks

All images are based on their alpine versions for lightweight and fast containers.

Web

Source images

Build multi-stage build explained

Stage base

# Build target: base #
######################

FROM node:14-alpine AS base

# Default directory for all stages
WORKDIR /app

# We set the only build arg as default ENV
ARG NODE_ENV=production
ENV PATH=/app/node_modules/.bin:$PATH \
    NODE_ENV="$NODE_ENV"

# We add `curl` so we can do healthchecks with ease
RUN apk --no-cache add curl

# Copy only the package and lock files to be ready for installation
COPY package.json package-lock.json yarn.lock /app/

# Expose default port for the app
EXPOSE 3000

Stage dependencies

# Build target dependencies #
#############################

FROM base AS dependencies

# Install prod dependencies
RUN yarn install --production && \

    # Cache prod dependencies
    # Later on we'll copy only this folder in the final prod image
    cp -R node_modules /prod_node_modules && \

    # Install dev dependencies
    # We need those for the build stage
    # After the build stage they will be discarded as layer is not used anymore
    # This will install only the delta dependencies between prod and dev
    yarn install --production=false

Stage development

# Build target development #
############################

FROM dependencies AS development

# We copy the app sources
# Only what's left after .dockerignore is applied
# We skip node_modules/ as in dev env we normally mount them externally
COPY . /app

# Start the dev server
CMD [ "yarn", "dev" ]

Stage builder

# Build target builder #
########################

FROM base AS builder

# We copy the dev dependencies from step `dependencies`
COPY --from=dependencies /app/node_modules /app/node_modules

# We copy the sources
COPY . /app

# Run lint so we fail early on errors
RUN yarn lint && \

    # When everything is good we start build process
    yarn build && \
    
    # Then we clean up the dev dependencies
    rm -rf node_modules

Stage production

# Build target production #
###########################

# We start with clean base image with no dependencies
FROM base AS production

# Copy pre-built sources `dist`, `build` or `.next` depending on the framework
# In this case it's `.next` folder
COPY --from=builder /app/.next /app/.next
COPY --from=builder /app/public /app/public

# Copy production dependencies only
COPY --from=dependencies /prod_node_modules /app/node_modules

# Start production server
CMD [ "yarn", "start" ]

Healthcheck

HEALTHCHECK --interval=5s --timeout=5s --retries=3 \
    CMD curl --fail http://localhost:3000 || exit 1