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derp: add server version to /debug, expvars

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This will make it easier for a human to tell what
version is deployed, for (say) correlating line numbers
in profiles or panics to corresponding source code.

It'll also let us observe version changes in prometheus.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder 2020-08-07 11:51:44 -07:00 committed by Josh Bleecher Snyder
parent c64a43a734
commit b23f2263c1
2 changed files with 6 additions and 0 deletions
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2
cmd/derper/derper.go
View File

@ -33,6 +33,7 @@
"tailscale.com/net/stun"
"tailscale.com/tsweb"
"tailscale.com/types/key"
"tailscale.com/version"
)
var (
@ -221,6 +222,7 @@ func debugHandler(s *derp.Server) http.Handler {
f("<li><b>Hostname:</b> %v</li>\n", *hostname)
f("<li><b>Uptime:</b> %v</li>\n", tsweb.Uptime())
f("<li><b>Mesh Key:</b> %v</li>\n", s.HasMeshKey())
f("<li><b>Version:</b> %v</li>\n", version.LONG)
f(`<li><a href="/debug/vars">/debug/vars</a> (Go)</li>
<li><a href="/debug/varz">/debug/varz</a> (Prometheus)</li>

4
derp/derp_server.go
View File

@ -29,6 +29,7 @@
"tailscale.com/metrics"
"tailscale.com/types/key"
"tailscale.com/types/logger"
"tailscale.com/version"
)
var debug, _ = strconv.ParseBool(os.Getenv("DERP_DEBUG_LOGS"))
@ -1191,6 +1192,9 @@ func (s *Server) ExpVar() expvar.Var {
m.Set("multiforwarder_created", &s.multiForwarderCreated)
m.Set("multiforwarder_deleted", &s.multiForwarderDeleted)
m.Set("packet_forwarder_delete_other_value", &s.removePktForwardOther)
var expvarVersion expvar.String
expvarVersion.Set(version.LONG)
m.Set("version", &expvarVersion)
return m
}