Brad Fitzpatrick
7d96cf5a62
The varz handler got its memstats_* metrics from the expvar package's "memstats" func, which calls runtime.ReadMemStats and so stopped the world on every Prometheus scrape. Keep the names but compute them from runtime/metrics, and never call that func, even from WritePrometheusExpvar. While there, export the /tailscale/ metrics from our Go fork (stack size histogram, stack copy counters, timer zombie counts and lifetime histogram), which nothing could see before, plus a few upstream ones with no MemStats equivalent: scheduling latency and GC pause histograms, live heap, GC and total CPU seconds, thread count, and mutex wait time. The last replaces derper's hand-rolled version. Everything read is cheap and a scrape allocates nothing after the first. Names use a go_runtime_ namespace rather than go_ so they can't collide with the Prometheus Go client's collector in promvarz binaries. The runtime's 162-bucket time histograms are reduced to one bucket per factor of four from 256ns to 1s. Updates #21300 Updates tailscale/go#189 Updates golang/go#75935 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Change-Id: I7e3c9a41f2b85d6e0c4a9b1d3f8e7c2a5b6d4e19
Tailscale
Private WireGuard® networks made easy
Overview
This repository contains the majority of Tailscale's open source code.
Notably, it includes the tailscaled daemon and
the tailscale CLI tool. The tailscaled daemon runs on Linux, Windows,
macOS, and to varying degrees
on FreeBSD and OpenBSD. The Tailscale iOS and Android apps use this repo's
code, but this repo doesn't contain the mobile GUI code.
Other Tailscale repos of note:
- the Android app is at https://github.com/tailscale/tailscale-android
- the Synology package is at https://github.com/tailscale/tailscale-synology
- the QNAP package is at https://github.com/tailscale/tailscale-qpkg
- the Chocolatey packaging is at https://github.com/tailscale/tailscale-chocolatey
For background on which parts of Tailscale are open source and why, see https://tailscale.com/opensource/.
Using
We serve packages for a variety of distros and platforms at https://pkgs.tailscale.com.
Other clients
The macOS, iOS, and Windows clients use the code in this repository but additionally include small GUI wrappers. The GUI wrappers on non-open source platforms are themselves not open source.
Building
We always require the latest Go release, currently Go 1.27. (While we build releases with our Go fork, its use is not required.)
go install tailscale.com/cmd/tailscale{,d}
If you're packaging Tailscale for distribution, use build_dist.sh
instead, to burn commit IDs and version info into the binaries:
./build_dist.sh tailscale.com/cmd/tailscale
./build_dist.sh tailscale.com/cmd/tailscaled
If your distro has conventions that preclude the use of
build_dist.sh, please do the equivalent of what it does in your
distro's way, so that bug reports contain useful version information.
Bugs
Please file any issues about this code or the hosted service on the issue tracker.
Contributing
PRs welcome! But please file bugs. Commit messages should reference bugs.
We require Developer Certificate of
Origin
Signed-off-by lines in commits.
See commit-messages.md (or skim git log) for our commit message style.
About Us
Tailscale is primarily developed by the people at https://github.com/orgs/tailscale/people. For other contributors, see:
- https://github.com/tailscale/tailscale/graphs/contributors
- https://github.com/tailscale/tailscale-android/graphs/contributors
Legal
WireGuard is a registered trademark of Jason A. Donenfeld.