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Optimize Dockerfile.

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This optimizes the Dockerfile by;

- Combining RUN statements so that files are removed in the
  same layer as they are added.
- Removing the downloaded .tar.gz of the docker-gen binary
  after expanding
- Adding `--no-install-recommends` (but explicitly installing
  ca-certificates)
- Replacing `ADD` with `COPY` (recommended if no unpacking is
  required)

Also added a `.dockerignore` file to prevent the `.git` directory
and README.md being added to the image.

These changes reduce the size of the image with 34 MB (was 268.4 MB,
now 233.9 MB), and results in less layers being produced.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2014-11-22 19:42:54 +01:00
parent a912287461
commit d68be71a3f
2 changed files with 25 additions and 17 deletions
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2
.dockerignore Normal file
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@ -0,0 +1,2 @@
.git
README.md

40
Dockerfile
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@ -2,28 +2,34 @@ FROM ubuntu:14.04
MAINTAINER Jason Wilder jwilder@litl.com
# Install Nginx.
RUN echo "deb http://ppa.launchpad.net/nginx/stable/ubuntu trusty main" > /etc/apt/sources.list.d/nginx-stable-trusty.list
RUN echo "deb-src http://ppa.launchpad.net/nginx/stable/ubuntu trusty main" >> /etc/apt/sources.list.d/nginx-stable-trusty.list
RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys C300EE8C
RUN apt-get update
RUN apt-get install --only-upgrade bash
RUN apt-get install -y wget nginx
RUN echo "deb http://ppa.launchpad.net/nginx/stable/ubuntu trusty main" > /etc/apt/sources.list.d/nginx-stable-trusty.list \
&& echo "deb-src http://ppa.launchpad.net/nginx/stable/ubuntu trusty main" >> /etc/apt/sources.list.d/nginx-stable-trusty.list \
&& apt-key adv --keyserver keyserver.ubuntu.com --recv-keys C300EE8C \
&& apt-get update \
&& apt-get install -y -q --no-install-recommends \
ca-certificates \
nginx \
wget \
&& apt-get clean \
&& rm -r /var/lib/apt/lists/*
RUN echo "daemon off;" >> /etc/nginx/nginx.conf
# Configure Nginx and apply fix for long server names
RUN echo "daemon off;" >> /etc/nginx/nginx.conf \
&& sed -i 's/# server_names_hash_bucket/server_names_hash_bucket/g' /etc/nginx/nginx.conf
#fix for long server names
RUN sed -i 's/# server_names_hash_bucket/server_names_hash_bucket/g' /etc/nginx/nginx.conf
RUN wget -P /usr/local/bin https://godist.herokuapp.com/projects/ddollar/forego/releases/current/linux-amd64/forego
RUN chmod u+x /usr/local/bin/forego
# Install Forego
RUN wget -P /usr/local/bin https://godist.herokuapp.com/projects/ddollar/forego/releases/current/linux-amd64/forego \
&& chmod u+x /usr/local/bin/forego
ENV DOCKER_GEN_VERSION 0.3.4
RUN wget https://github.com/jwilder/docker-gen/releases/download/$DOCKER_GEN_VERSION/docker-gen-linux-amd64-$DOCKER_GEN_VERSION.tar.gz
RUN tar -C /usr/local/bin -xvzf docker-gen-linux-amd64-$DOCKER_GEN_VERSION.tar.gz
RUN mkdir /app
WORKDIR /app
ADD . /app
RUN wget https://github.com/jwilder/docker-gen/releases/download/$DOCKER_GEN_VERSION/docker-gen-linux-amd64-$DOCKER_GEN_VERSION.tar.gz \
&& tar -C /usr/local/bin -xvzf docker-gen-linux-amd64-$DOCKER_GEN_VERSION.tar.gz \
&& rm /docker-gen-linux-amd64-$DOCKER_GEN_VERSION.tar.gz
COPY . /app/
WORKDIR /app/
EXPOSE 80
ENV DOCKER_HOST unix:///tmp/docker.sock