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Optimize docker image build size with curl – Debian

I need to install on docker the latest version of curl

when using the following the docker size is ~140MB

FROM debian:10.7

RUN apt-get update && 
    apt-get install --no-install-recommends -y curl wget ca-certificates

This use curl 7.64

when using the following

FROM debian:10.7

RUN apt-get update && 
    apt-get install --yes --no-install-recommends wget build-essential ca-certificates libcurl4 && 
    wget https://curl.se/download/curl-7.73.0.tar.gz && 
    tar -xvf curl-7.73.0.tar.gz && cd curl-7.74.0 && 
    ./configure && make && make install && 
    apt-get purge -y --auto-remove build-essential &&

The docker image size is 240MB, I’ve tried to remove the build essintials which reduce the size from 440 to 240 , is there a way to remove this additional ~100MB ?

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3

Answers


  1. 0

    You should inclide rm -rf /var/lib/apt/lists/* into your RUN instruction to remove apt index files and might include apt-get clean to remove any other remaining package file.

    Apart from that, you could also try using the slim image version, according to Docker Hub debian:10.7-slim is almost half size (~24Mb vs ~48Mb)

    Finally, you can execute du -h | sort -h on a container from your generated image to find out where is the remaining space usage.

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  2. 0

    In fact, you are close to the solution. The one you missed is to delete the curl source package.

    So next should make the image reduce:

    FROM debian:10.7

RUN apt-get update && 
    apt-get install --yes --no-install-recommends wget build-essential ca-certificates libcurl4 && 
    wget https://curl.se/download/curl-7.73.0.tar.gz && 
    tar -xvf curl-7.73.0.tar.gz && cd curl-7.73.0 && 
    ./configure && make && make install && 
    apt-get purge -y --auto-remove build-essential && 
    cd .. && rm -fr curl-7.73.0.tar.gz curl-7.73.0

    Without Curl:

    $ docker images abc:1
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
abc                 1                   d742bfdf5fa6        25 seconds ago      148MB

    With curl & source package delete:

    $ docker images abc:2
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
abc                 2                   afe3d404852a        27 minutes ago      151MB

    Additional, if you delete apt cache with rm -rf /var/lib/apt/lists/* in Dockerfile, if will be smaller:

    $ docker images abc:3
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
abc                 3                   5530b0e9b44f        2 minutes ago       134MB

    Another solution maybe use multistage-build, you could use ./configure --prefix=xxx to set a default install location, then stage1 just used to build curl, while stage2 copy the xxx folder from stage1 to final image.

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  3. 0

    Using multistage-build as suggested by atline :

    FROM debian:10.7 AS builder

WORKDIR /app
RUN mkdir /app/usr2

RUN apt-get update && 
    apt-get install --yes --no-install-recommends wget build-essential ca-certificates libcurl4 && 
    wget https://curl.se/download/curl-7.73.0.tar.gz && 
    tar -xvf curl-7.73.0.tar.gz && cd curl-7.73.0 && 
    ./configure --prefix=/app/usr2 && make install

FROM debian:10.7

RUN apt-get update && 
    apt-get install --no-install-recommends -y wget ca-certificates &&
    rm -rf /var/lib/apt/lists/*

COPY --from=builder /app/usr2/. /usr

    Final size is 129MB

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