Base container can make Docker build much faster.
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Our original Dockerfile contained a lot of code to install NodeJS that takes a long time to run.
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Installing NodeJS is a redundant operation -- it shouldn't need to be reinstalled every time we build an image because we don’t expect to make changes to it.
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By using a base image that has NodeJS installed, we can reduce the amount of time it takes to build an image for NodeJS and our application’s code. We would use a pre-existing image that already has NodeJS and just build on top of it for the application’s code.
original Dockerfile
FROM buildpack-deps:stretch # Install NodeJS dependencies RUN groupadd --gid 1000 node && useradd --uid 1000 --gid node --shell /bin/bash --create-home node ENV NODE_VERSION 13.12.0 RUN ARCH= && dpkgArch="$(dpkg --print-architecture)" && case "${dpkgArch##*-}" in amd64) ARCH='x64';; ppc64el) ARCH='ppc64le';; s390x) ARCH='s390x';; arm64) ARCH='arm64';; armhf) ARCH='armv7l';; i386) ARCH='x86';; *) echo "unsupported architecture"; exit 1 ;; esac # gpg keys listed at https://github.com/nodejs/node#release-keys && set -ex && for key in 94AE36675C464D64BAFA68DD7434390BDBE9B9C5 FD3A5288F042B6850C66B31F09FE44734EB7990E 71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 DD8F2338BAE7501E3DD5AC78C273792F7D83545D C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 B9AE9905FFD7803F25714661B63B535A4C206CA9 77984A986EBC2AA786BC0F66B01FBB92821C587A 8FCCA13FEF1D0C2E91008E09770F7A9A5AE15600 4ED778F539E3634C779C87C6D7062848A1AB005C A48C2BEE680E841632CD4E44F07496B3EB3C1762 B9E2F5981AA6E0CD28160D9FF13993A75599653C ; do gpg --batch --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys "$key" || gpg --batch --keyserver hkp://ipv4.pool.sks-keyservers.net --recv-keys "$key" || gpg --batch --keyserver hkp://pgp.mit.edu:80 --recv-keys "$key" ; done && curl -fsSLO --compressed "https://nodejs.org/dist/v$NODE_VERSION/node-v$NODE_VERSION-linux-$ARCH.tar.xz" && curl -fsSLO --compressed "https://nodejs.org/dist/v$NODE_VERSION/SHASUMS256.txt.asc" && gpg --batch --decrypt --output SHASUMS256.txt SHASUMS256.txt.asc && grep " node-v$NODE_VERSION-linux-$ARCH.tar.xz$" SHASUMS256.txt | sha256sum -c - && tar -xJf "node-v$NODE_VERSION-linux-$ARCH.tar.xz" -C /usr/local --strip-components=1 --no-same-owner && rm "node-v$NODE_VERSION-linux-$ARCH.tar.xz" SHASUMS256.txt.asc SHASUMS256.txt && ln -s /usr/local/bin/node /usr/local/bin/nodejs # smoke tests && node --version && npm --version ENV YARN_VERSION 1.22.4 RUN set -ex && for key in 6A010C5166006599AA17F08146C2130DFD2497F5 ; do gpg --batch --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys "$key" || gpg --batch --keyserver hkp://ipv4.pool.sks-keyservers.net --recv-keys "$key" || gpg --batch --keyserver hkp://pgp.mit.edu:80 --recv-keys "$key" ; done && curl -fsSLO --compressed "https://yarnpkg.com/downloads/$YARN_VERSION/yarn-v$YARN_VERSION.tar.gz" && curl -fsSLO --compressed "https://yarnpkg.com/downloads/$YARN_VERSION/yarn-v$YARN_VERSION.tar.gz.asc" && gpg --batch --verify yarn-v$YARN_VERSION.tar.gz.asc yarn-v$YARN_VERSION.tar.gz && mkdir -p /opt && tar -xzf yarn-v$YARN_VERSION.tar.gz -C /opt/ && ln -s /opt/yarn-v$YARN_VERSION/bin/yarn /usr/local/bin/yarn && ln -s /opt/yarn-v$YARN_VERSION/bin/yarnpkg /usr/local/bin/yarnpkg && rm yarn-v$YARN_VERSION.tar.gz.asc yarn-v$YARN_VERSION.tar.gz # smoke test && yarn --version # Create app directory WORKDIR /usr/src/app # Install app dependencies by copying # package.json and package-lock.json COPY package*.json ./ # Install dependencies RUN npm install # Copy app source COPY . . # Bind the port that the image will run on EXPOSE 8080 # Define the Docker image's behavior at runtime CMD ["node", "server.js"]
A base docker image:
FROM buildpack-deps:stretch # Install NodeJS dependencies RUN groupadd --gid 1000 node && useradd --uid 1000 --gid node --shell /bin/bash --create-home node ENV NODE_VERSION 13.12.0 RUN ARCH= && dpkgArch="$(dpkg --print-architecture)" && case "${dpkgArch##*-}" in amd64) ARCH='x64';; ppc64el) ARCH='ppc64le';; s390x) ARCH='s390x';; arm64) ARCH='arm64';; armhf) ARCH='armv7l';; i386) ARCH='x86';; *) echo "unsupported architecture"; exit 1 ;; esac # gpg keys listed at https://github.com/nodejs/node#release-keys && set -ex && for key in 94AE36675C464D64BAFA68DD7434390BDBE9B9C5 FD3A5288F042B6850C66B31F09FE44734EB7990E 71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 DD8F2338BAE7501E3DD5AC78C273792F7D83545D C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 B9AE9905FFD7803F25714661B63B535A4C206CA9 77984A986EBC2AA786BC0F66B01FBB92821C587A 8FCCA13FEF1D0C2E91008E09770F7A9A5AE15600 4ED778F539E3634C779C87C6D7062848A1AB005C A48C2BEE680E841632CD4E44F07496B3EB3C1762 B9E2F5981AA6E0CD28160D9FF13993A75599653C ; do gpg --batch --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys "$key" || gpg --batch --keyserver hkp://ipv4.pool.sks-keyservers.net --recv-keys "$key" || gpg --batch --keyserver hkp://pgp.mit.edu:80 --recv-keys "$key" ; done && curl -fsSLO --compressed "https://nodejs.org/dist/v$NODE_VERSION/node-v$NODE_VERSION-linux-$ARCH.tar.xz" && curl -fsSLO --compressed "https://nodejs.org/dist/v$NODE_VERSION/SHASUMS256.txt.asc" && gpg --batch --decrypt --output SHASUMS256.txt SHASUMS256.txt.asc && grep " node-v$NODE_VERSION-linux-$ARCH.tar.xz$" SHASUMS256.txt | sha256sum -c - && tar -xJf "node-v$NODE_VERSION-linux-$ARCH.tar.xz" -C /usr/local --strip-components=1 --no-same-owner && rm "node-v$NODE_VERSION-linux-$ARCH.tar.xz" SHASUMS256.txt.asc SHASUMS256.txt && ln -s /usr/local/bin/node /usr/local/bin/nodejs # smoke tests && node --version && npm --version ENV YARN_VERSION 1.22.4 RUN set -ex && for key in 6A010C5166006599AA17F08146C2130DFD2497F5 ; do gpg --batch --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys "$key" || gpg --batch --keyserver hkp://ipv4.pool.sks-keyservers.net --recv-keys "$key" || gpg --batch --keyserver hkp://pgp.mit.edu:80 --recv-keys "$key" ; done && curl -fsSLO --compressed "https://yarnpkg.com/downloads/$YARN_VERSION/yarn-v$YARN_VERSION.tar.gz" && curl -fsSLO --compressed "https://yarnpkg.com/downloads/$YARN_VERSION/yarn-v$YARN_VERSION.tar.gz.asc" && gpg --batch --verify yarn-v$YARN_VERSION.tar.gz.asc yarn-v$YARN_VERSION.tar.gz && mkdir -p /opt && tar -xzf yarn-v$YARN_VERSION.tar.gz -C /opt/ && ln -s /opt/yarn-v$YARN_VERSION/bin/yarn /usr/local/bin/yarn && ln -s /opt/yarn-v$YARN_VERSION/bin/yarnpkg /usr/local/bin/yarnpkg && rm yarn-v$YARN_VERSION.tar.gz.asc yarn-v$YARN_VERSION.tar.gz # smoke test && yarn --version CMD ["node"] ## Run node env
So, we have a docker file only do the process for node env.
Build image:
docker build -t slow-node-base .
Tag image and push to registry:
docker tag slow-node-base <username>/slow-node-base
docker push <username>/slow-node-base
So our new Dockerfile looks like:
FROM <username>/slow-node-base:latest # Create app directory WORKDIR /usr/src/app # Install app dependencies by copying # package.json and package-lock.json COPY package*.json ./ # Install dependencies RUN npm install # Copy app source COPY . . # Bind the port that the image will run on EXPOSE 8080 # Define the Docker image's behavior at runtime CMD ["node", "server.js"]
Then run the docker will be faster.