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I am trying to install 32-bit packages on official alpine docker images but whenever I do apk add libcurl for example it install 64-bit version of libcurl whereas I want to install 32-bit package.
Any thoughts how to do the same on Alpine Linux 3.7?
927
You can install packages from a local disk (such as CDROM or a USB stick) or the internet archive location using apk command, the Alpine package manager for binary packages, instead of compiling them from the source. The list of repositories is stored in /etc/apk/repositories configuration file.
If you run Docker on a non-Linux host, for example in Docker Desktop on Windows and macOS, then your containers are probably running on Alpine Linux. Native versions are available for 32- and 64-bit x86 and Arm, plus PPC64le and IBM s390x; MIPS64 was dropped in the last release.
Alpine Linux is a very simple distribution that will try to stay out of your way. It uses its own package manager called apk, the OpenRC init system, script driven set-ups and that's it!
Actually, only one file defines which packages take from alpine repos. It is /etc/apk/arch:
# cat /etc/apk/arch
x86_64
Its value shows which packages we should take from our alpine repos:
# cat /etc/apk/repositories
http://dl-cdn.alpinelinux.org/alpine/v3.7/main
http://dl-cdn.alpinelinux.org/alpine/v3.7/community
So, we can make a trick here. We can "switch" alpine to get x86 packages from the repos:
/ # echo "x86" > /etc/apk/arch
/ # apk add --no-cache libcurl
fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/main/x86/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/community/x86/APKINDEX.tar.gz
(1/12) Replacing musl (1.1.18-r2 -> 1.1.18-r2)
(2/12) Replacing busybox (1.27.2-r8 -> 1.27.2-r8)
Executing busybox-1.27.2-r8.post-upgrade
(3/12) Replacing alpine-baselayout (3.0.5-r2 -> 3.0.5-r2)
Executing alpine-baselayout-3.0.5-r2.pre-upgrade
Executing alpine-baselayout-3.0.5-r2.post-upgrade
(4/12) Replacing libressl2.6-libcrypto (2.6.3-r0 -> 2.6.3-r0)
(5/12) Replacing libressl2.6-libssl (2.6.3-r0 -> 2.6.3-r0)
(6/12) Replacing zlib (1.2.11-r1 -> 1.2.11-r1)
(7/12) Replacing apk-tools (2.8.2-r0 -> 2.8.2-r0)
(8/12) Replacing scanelf (1.2.2-r1 -> 1.2.2-r1)
(9/12) Replacing musl-utils (1.1.18-r2 -> 1.1.18-r2)
(10/12) Installing ca-certificates (20171114-r0)
(11/12) Installing libssh2 (1.8.0-r2)
(12/12) Installing libcurl (7.57.0-r0)
Executing busybox-1.27.2-r8.trigger
Executing ca-certificates-20171114-r0.trigger
OK: 5 MiB in 14 packages
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