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Build your Astro Site with Docker

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Docker is a tool to build, deploy, and run applications using containers.

Docker images and containers can be deployed to many different platforms, like AWS, Azure, and Google Cloud. This recipe won’t cover how to deploy your site to a specific platform but will show you how to set up Docker for your project.

Create a file called Dockerfile in your project’s root directory. This file contains the instructions to build your site, which will differ depending on your needs. This guide can’t show all possible options but will give you starting points for SSR and static mode.

If you’re using another package manager than npm, you’ll need to adjust the commands accordingly.

This Dockerfile will build your site and serve it using Node.js on port 4321 and therefore requires the Node adapter installed in your Astro project.

Dockerfile
FROM node:lts AS runtime
WORKDIR /app
COPY . .
RUN npm install
RUN npm run build
ENV HOST=0.0.0.0
ENV PORT=4321
EXPOSE 4321
CMD node ./dist/server/entry.mjs

Adding a .dockerignore file to your project is best practice. This file describes which files or folders should be ignored in the Docker COPY or ADD commands, very similar to how .gitignore works. This speeds up the build process and reduces the size of the final image.

.dockerignore
.DS_Store
node_modules
dist

This file should go in the same directory as the Dockerfile itself. Read the .dockerignore documentation for extra info

The following Dockerfile will build your site and serve it using Apache httpd on port 80 with the default configuration.

Dockerfile
FROM node:lts AS build
WORKDIR /app
COPY . .
RUN npm i
RUN npm run build
FROM httpd:2.4 AS runtime
COPY --from=build /app/dist /usr/local/apache2/htdocs/
EXPOSE 80
Dockerfile
FROM node:lts AS build
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
RUN npm run build
FROM nginx:alpine AS runtime
COPY ./nginx/nginx.conf /etc/nginx/nginx.conf
COPY --from=build /app/dist /usr/share/nginx/html
EXPOSE 8080

In order to build the Dockerfile above, you’ll also need to create a configuration file for NGINX. Create a folder called nginx in your project’s root directory and create a file called nginx.conf inside.

nginx.conf
worker_processes 1;
events {
worker_connections 1024;
}
http {
server {
listen 8080;
server_name _;
root /usr/share/nginx/html;
index index.html index.htm;
include /etc/nginx/mime.types;
gzip on;
gzip_min_length 1000;
gzip_proxied expired no-cache no-store private auth;
gzip_types text/plain text/css application/json application/javascript application/x-javascript text/xml application/xml application/xml+rss text/javascript;
error_page 404 /404.html;
location = /404.html {
root /usr/share/nginx/html;
internal;
}
location / {
try_files $uri $uri/index.html =404;
}
}
}

Here’s an example of a more advanced Dockerfile that, thanks to Docker’s multi-stage builds, optimizes the build process for your site by not reinstalling the npm dependencies when only the source code changes. This can reduce the build time even by minutes, depending on the size of your dependencies.

Dockerfile
FROM node:lts AS base
WORKDIR /app
# By copying only the package.json and package-lock.json here, we ensure that the following `-deps` steps are independent of the source code.
# Therefore, the `-deps` steps will be skipped if only the source code changes.
COPY package.json package-lock.json ./
FROM base AS prod-deps
RUN npm install --omit=dev
FROM base AS build-deps
RUN npm install
FROM build-deps AS build
COPY . .
RUN npm run build
FROM base AS runtime
COPY --from=prod-deps /app/node_modules ./node_modules
COPY --from=build /app/dist ./dist
ENV HOST=0.0.0.0
ENV PORT=4321
EXPOSE 4321
CMD node ./dist/server/entry.mjs
  1. Build your container by running the following command in your project’s root directory. Use any name for <your-astro-image-name>:

    Terminal window
    docker build -t <your-astro-image-name> .

    This will output an image, which you can run locally or deploy to a platform of your choice.

  2. To run your image as a local container, use the following command.

    Replace <local-port> with an open port on your machine. Replace <container-port> with the port exposed by your Docker container (4321, 80, or 8080 in the above examples.)

    Terminal window
    docker run -p <local-port>:<container-port> <your-astro-image-name>

    You should be able to access your site at http://localhost:<local-port>.

  3. Now that your website is successfully built and packaged in a container, you can deploy it to a cloud provider. See the Google Cloud deployment guide for one example, and the Deploy your app page in the Docker docs.

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