[atlas-sw-probes] RIPE Atlas Software Probe using Alpine Linux

Hi,

I've created Docker images of RIPE Atlas Software Probe using Alpine Linux.

The main goal was to achieve the smallest image sizes possible and run them
on MikroTik routers, now that RouterOS supports running containers[1].

The image size difference is quite impressive. While an exported tarball of
a debian:10-slim image with atlasswprobe-*.deb installed reaches ~95MiB, my
version based on Alpine is only ~15MiB.

I had to make small changes to the code, like checkout devel branch on
ripe-atlas-probe-busybox because it has fixes for musl and apply a patch
that fixes syscalls for arm32v7. But other than that it is built using the
same code provided for Debian.

Images were compiled for amd64, arm64v8 and arm32v7 and they seem to work
well on all 3 architectures.

I have a probe running[2] on my MikroTik RouterBOARD using this code. It is
not quite stable yet due to all the testing I have done, but it is there as
a proof of concept :)

*This is still a work in progress.* Maybe there's something not quite
right. Please let me know if you find something.

Code is available on GitHub[3]. Images on Docker Hub[4].

Best regards,
César

[1] https://forum.mikrotik.com/viewtopic.php?f=2&t=178437
[2] https://atlas.ripe.net/probes/1002873/
[3] https://github.com/CTassisF/ripe-atlas-alpine
[4] https://hub.docker.com/r/ctassisf/ripe-atlas-alpine
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