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I am building a new Docker image with:
FROM alpine:3.4 RUN apk upgrade --update However, its failing with the error:
[INFO] /bin/sh: apk: not found This seems to work fine on my local machine (Mac OSX) but when I try building it on a Linux CentOS 7 machine it fails.
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Alpine Linux comes with BusyBox. It is described as “The Swiss Army Knife of Embedded Linux.” BusyBox combines tiny versions of many standard UNIX utilities into a single small executable, including /bin/sh.
Add a PackageUse add to install packages from a repository. Any necessary dependencies are also installed. If you have multiple repositories, the add command installs the newest package. If you only have the main repository enabled in your configuration, apk will not include packages from the other repositories.
To install Docker on Alpine Linux, run apk add --update docker openrc. The Docker package is available in the Community repository. Therefore, if apk add fails because of unsatisfiable constraints error, you need to edit the /etc/apk/repositories file to add (or uncomment) a line.
What is Alpine Linux? Alpine Linux is a Linux distribution built around musl libc and BusyBox. The image is only 5 MB in size and has access to a package repository that is much more complete than other BusyBox based images. This makes Alpine Linux a great image base for utilities and even production applications.
I ran into something like this. It completely blew my mind, and I was questioning my sanity for a bit until I realized that /sbin wasn't in my container's PATH.
# interactive session PATH="${PATH}:/sbin" # Dockerfile ENV PATH="${PATH}:/sbin" If you type command -v apk in an interactive session in your container's base image and compare that directory with the container's $PATH that should get you squared away.
If command -v apk doesn't work for you, you could try to find it via
find / -name apk -type f -exec dirname "{}" ";" To the best of my knowledge this is always in /sbin. However you get there, just ensure that the apk binary's location is part of $PATH
TL;DR - If you see this error, ensure that your executable's dirname is in your $PATH
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In the end we upgraded our projects to use this Docker Maven plugin: https://github.com/fabric8io/fabric8-maven-plugin. No issue thus far.
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