linkerd2 linkerd-await 0.2.8 fails to run on alpine linux

What is the issue?

Since 0.2.8 iinkerd-await is dynamically linked against glibc which is not present on alpine linux. Installing compatibility package does not satisfy the dependencies for linkerd-await.

How can it be reproduced?

Download and run linkerd-await on alpine linux (e.g. python:3.11-alpine:latest):

docker run --rm -ti python:3.11-alpine sh
apk add gcompat libgcc
wget https://github.com/linkerd/linkerd-await/releases/download/release/v0.2.8/linkerd-await-v0.2.8-amd64
chmod +x linkerd-await-v0.2.8-amd64
./linkerd-await-v0.2.8-amd64

Logs, error output, etc

Output when running linkerd-await:

Error relocating /linkerd-await-v0.2.8-amd64: __res_init: symbol not found

Output from ldd:

	/lib64/ld-linux-x86-64.so.2 (0x7f3db46d7000)
	libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x7f3db457f000)
	libc.so.6 => /lib64/ld-linux-x86-64.so.2 (0x7f3db46d7000)
Error relocating linkerd-await-v0.2.8-amd64: __res_init: symbol not found
Error relocating linkerd-await-v0.2.8-amd64: gnu_get_libc_version: symbol not found

output of `linkerd check -o short`

n/a (this is about linkerd-await. linkerd itself works like a charm.)

Environment

alpine linux based images (e.g. python:3.11-alpine)

Possible solution

Build the binary statically linked

RUSTFLAGS='-C target-feature=+crt-static' cargo build --release --target x86_64-unknown-linux-gnu

Another solution would be to link against an older version of glibc (e.g. manylinux2014) instead of the one included in latest Ubuntu.

Additional context

No response

Would you like to work on fixing this bug?

None

Dec 14 '23 10:12 elias5000

Thanks for reporting this - we are unlikely to have bandwidth to look at this before the new year. But if anyone wants to try and submit a fix we'd welcome it.