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Brendan Creane
a7cb5745a2
* tstest/natlab/vmtest: make cloud VM boot robust without KVM Adding heavier distro images (Fedora) surfaced several ways the cloud VM boot path breaks under TCG software emulation (no /dev/kvm), especially with multiple concurrent VMs on few cores. - Add a virtio-rng device to the cloud path so early boot doesn't block in getrandom() waiting for the CRNG to seed. - When no hardware acceleration is available, relax the stuck-console watchdog (tuned for KVM's ~1-2s first output) and serialize VM boots so a heavy guest doesn't starve its siblings' emulation threads. - Bound the bring-up context to the test deadline and dump each VM's console on failure, so a hang surfaces as a diagnosable Fatalf instead of an opaque `go test -timeout` panic (which skips cleanups). Fixes tailscale/corp#44794 Updates tailscale/corp#44793 Signed-off-by: Brendan Creane <bcreane@gmail.com> * tstest/natlab/vmtest: add Fedora and DNS-backend test coverage Add the first RHEL-family distro and the machinery to assert and provision distinct DNS backends, so adding a distro isn't "basically equivalent" to the others. - Add a Fedora 43 image (NetworkManager + systemd-resolved, SELinux enforcing). restorecon-relabel the curl'd binaries so they exec under enforcing mode. - Add DNSBackend/AssertDNSBackend, reading the dns_manager_linux_mode_* clientmetric to assert which backend tailscaled selected. - Add a WithDNSMode node option. WithDNSMode(DNSDirect) masks systemd-resolved and writes a plain resolv.conf pointing at natlab's fake DNS, forcing the direct backend -- so one image covers multiple backends. Fixes tailscale/corp#44796 Updates tailscale/corp#44793 Signed-off-by: Brendan Creane <bcreane@gmail.com> --------- Signed-off-by: Brendan Creane <bcreane@gmail.com>