Date: Fri, 28 Jun 2024 08:53:36 -0700 From: Alex Arslan <ararslan@comcast.net> To: freebsd-hackers@freebsd.org Subject: Diagnosing virtual machine network issues Message-ID: <FA265FAA-216D-4DCC-92C0-50017C17F7DE@comcast.net>
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Hello, I originally posted the following to freebsd-questions but was = encouraged to repost here instead. I work on the Julia language (https://julialang.org) and am the de facto maintainer of its FreeBSD support. Our continuous integration runs jobs = in FreeBSD 13.2 AMD64 virtual machines with KVM on Linux. This same Linux machine also runs Windows jobs in VMs with KVM as well as Linux jobs = using a custom sandboxing setup. We've noticed a number of network-related issues that only occur on the FreeBSD VMs and cause tests to fail. Currently we reliably see a test failure that expects a host resolution failure via libcurl from https://domain.invalid but on the FreeBSD VMs we instead get a timeout. Previously we've also seen timeouts when making requests to httpbingo and GitHub. However, I've never been able to reproduce any of these test failures, which makes me suspect there's an issue with how we've set up networking for the VMs. Can anybody provide guidance for how to determine what, if anything, = could be misconfigured? I apologize for the vagueness of this question; I'm = not really familiar with anything networking- or virtualization-related, so I'm not sure what information would be helpful to include here. The complete setup lives in = https://github.com/JuliaCI/sandboxed-buildkite-agent in the freebsd-kvm directory. In base-image/freebsd13.pkr.hcl [1], which uses Packer to build a base qcow2 image, we set net_device =3D = "virtio-net". In buildkite-worker/kvm_machine.xml.template [2], we set the target = device to vnet0 with bridge virbr0. Thank you very much for your time! Best, Alex [1]: = https://github.com/JuliaCI/sandboxed-buildkite-agent/blob/main/freebsd-kvm= /base-image/freebsd13.pkr.hcl [2]: = https://github.com/JuliaCI/sandboxed-buildkite-agent/blob/main/freebsd-kvm= /buildkite-worker/kvm_machine.xml.template=
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