Optimize docker image build size with curl - linux

Question

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 ?

Answer 1

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.

Answer 2

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.

Answer 3

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