Alpine build of Datadog.Trace.ClrProfiler.Native about dd-trace-dotnet

[d47id]

All the suggestions in this thread involve adding packages to enable glibc support on alpine. What the original requester is asking for is a copy of Datadog.Trace.ClrProfiler.Native that's compiled against musl-libc so it works out of the box on alpine.

We used libc6-compat on alpine 3.7 successfully for some time, but the last supported .net core version with an alpine 3.7 base is 2.2.7.

We attempted to use both gcompat and https://github.com/sgerrand/alpine-pkg-glibc on alpine 3.11. Although this allowed some of our services to start, others still failed and we saw random core dumps until we finally gave up and started using Debian-based runtime images.

For now, I think you guys should explicitly say you DO NOT SUPPORT Alpine, and I wouldn't consider this resolved until you provide a copy of Datadog.Trace.ClrProfiler.Native that was compiled on Alpine against musl-libc.

[lucaspimentel]

We are actively working on a build compiled against musl-libc to officially support Alpine Linux. See #621.

[lucaspimentel]

Hey, @chris-cummings. Sorry for the delayed response. We recently tested the profiler on different Linux environments and found out the following:

• works out of the box on Ubuntu 18.04 (mcr.microsoft.com/dotnet/core/runtime:2.1-bionic)
• works out of the box on Debian 9 (mcr.microsoft.com/dotnet/core/runtime:2.1-stretch-slim)
• on Alpine 3.7 (mcr.microsoft.com/dotnet/core/runtime:2.1-alpine3.7), requires adding the libc6-compat package using apk add libc6-compat as documented
• on Alpine 3.9 (mcr.microsoft.com/dotnet/core/runtime:2.1-alpine3.9), the profiler does not load, even after adding the libc6-compat package

We will investigate that last one (Alpine 3.9) and leave this issue open until it is resolved.

Thanks again for your feedback!

(edit: formatting)

[franck-schmidlin]

just been faffing around this.
Works well with microsoft/dotnet:2.2-sdk-alpine
but not with mcr.microsoft.com/dotnet/core/aspnet:2.2-alpine3.9

I'm still hoping to figre out why

[chris-cummings]

Thanks guys, looks like the piece we were missing was the libc6-compat package. I will stay tuned for what you learn in from your alpine 3.9 testing.

[franck-schmidlin]

Works here with mcr.microsoft.com/dotnet/core/aspnet:2.2-alpine3.8 (+libc6-compat)
Issue seems to be specific to 3.9

[zacharycmontoya]

It looks like on Alpine 3.9 we're missing the shared library ld-linux-x86-64.so.2, which can be found in the gcompat package. I've tested locally that adding this package allows our profiler to be launched on Alpine 3.9 and it successfully performs automatic instrumentation.

@franck-schmidlin can you verify that installing gcompat on top of mcr.microsoft.com/dotnet/core/aspnet:2.2-alpine3.9 succeeds?

[lucaspimentel]

Related: #561

[seanamosw]

I believe I'm bumping into this as well.

Using the Microsoft image: mcr.microsoft.com/dotnet/core/aspnet:3.1.1-alpine3.10
Installing the apks: ibc6-compat, gcompat

The automatic instrumentation fails to start:

/var/log/datadog # cat dotnet-profiler.log 
[dotnet] 1: [info] Datadog CLR Profiler 1.12.0
[dotnet] 1: [debug] Initialize
[dotnet] 1: [info] Environment variables:
[dotnet] 1: [info]   DD_TRACE_ENABLED=
[dotnet] 1: [info]   DD_TRACE_DEBUG=true
[dotnet] 1: [info]   DD_DOTNET_TRACER_HOME=/opt/datadog
[dotnet] 1: [info]   DD_INTEGRATIONS=/opt/datadog/integrations.json
[dotnet] 1: [info]   DD_PROFILER_PROCESSES=
[dotnet] 1: [info]   DD_PROFILER_EXCLUDE_PROCESSES=
[dotnet] 1: [info]   DD_AGENT_HOST=
[dotnet] 1: [info]   DD_TRACE_AGENT_PORT=
[dotnet] 1: [info]   DD_ENV=
[dotnet] 1: [info]   DD_SERVICE_NAME=
[dotnet] 1: [info]   DD_DISABLED_INTEGRATIONS=
[dotnet] 1: [info]   DD_CLR_DISABLE_OPTIMIZATIONS=
[dotnet] 1: [debug] Loading integrations from file: /opt/datadog/integrations.json
[dotnet] 1: [warn] Failed to load integrations: No error information
[dotnet] 1: [warn] Profiler disabled: no enabled integrations found.

To answer the obvious, yes /opt/datadog/integrations.json exists.

[colin-higgins]

Hello all, we now officially support automatic instrumentation with the new package (datadog-dotnet-apm-1.13.0-musl.tar.gz) available in the 1.13 release (https://github.com/DataDog/dd-trace-dotnet/releases/tag/v1.13.0)