Teleport

Profiling

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Teleport leverages Go's diagnostic capabilities to collect and export profiling data. Profiles can help identify the cause of spikes in CPU, the source of memory leaks, or the reason for a deadlock.

Enable profiling

The profiling endpoint is only enabled if the --debug flag is supplied.

Teleport's diagnostic HTTP endpoints are disabled by default. You can enable them via:

Start a teleport instance with the --diag-addr flag set to the local address where the diagnostic endpoint will listen:

sudo teleport start --diag-addr=127.0.0.1:3000

Edit a teleport instance's configuration file (/etc/teleport.yaml by default) to include the following:

teleport:
    diag_addr: 127.0.0.1:3000

Verify that Teleport is now serving the diagnostics endpoint:

curl http://127.0.0.1:3000

Collecting profiles

Go's standard profiling endpoints are served at http://127.0.0.1:3000/debug/pprof/. Retrieving a profile requires sending a request to the endpoint corresponding to the desired profile type. When debugging an issue it is helpful to collect a series of profiles over a period of time.

CPU

CPU profile shows execution statistics gathered over a user specified period:

Download the profile into a file:
curl -o cpu.profile http://127.0.0.1:3000/debug/pprof/profile?seconds=30
Visualize the profile
go tool pprof -http : cpu.profile

Goroutine

Goroutine profiles show the stack traces for all running goroutines in the system:

Download the profile into a file:
curl -o goroutine.profile http://127.0.0.1:3000/debug/pprof/goroutine
Visualize the profile
go tool pprof -http : goroutine.profile

Heap

Heap profiles show allocated objects in the system:

Download the profile into a file:
curl -o heap.profile http://127.0.0.1:3000/debug/pprof/heap
Visualize the profile
go tool pprof  -http : heap.profile

Trace

Trace profiles capture scheduling, system calls, garbage collections, heap size, and other events that are collected by the Go runtime over a user specified period of time:

Download the profile into a file:
curl -o trace.out http://127.0.0.1:3000/debug/pprof/trace?seconds=5
Visualize the profile
go tool trace trace.out

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