How to get profile data from a openshift process on OpenShift 3 ?

Solution Verified - Updated

Environment

OpenShift Container Platform (master API)

Issue

How to get profile data from openshift process like memory, CPU load and blocking?

Resolution

You can hit oc get --raw /debug/pprof/<PROFILE>.

For openshift node, you need to specify --server https://<IP or hostname>:10250 for example:

oc get --raw /debug/pprof/heap?debug=1 --server https://knakayam-ose37-all:10250

In the same manner, for openshift master controllers, you need to specify --server https://<IP or hostname>:8444.

Without --server https://HOST:PORT, oc command collects profile from master API. However, please notice that your access was load balanced if you have multiple master hosts.

Here is the example of the list:

NOTE: You need to run commands with admin role (e.g cluster-admin).

goroutine

# oc get --raw /debug/pprof/goroutine?debug=1 --server https://HOST:PORT

heap

# oc get --raw /debug/pprof/heap?debug=1 --server https://HOST:PORT

threadcreate

# oc get --raw /debug/pprof/threadcreate?debug=1 --server https://HOST:PORT

full goroutine stack dump

# oc get --raw /debug/pprof/goroutine?debug=2 --server https://HOST:PORT

Trace 30s CPU

NOTE This command takes 30 secsand outputs raw data.

# oc get --raw /debug/pprof/profile --server https://HOST:PORT

Heap dump & total allocations

NOTE This command outputs raw data.

# oc get --raw /debug/pprof/heap --server https://HOST:PORT
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