Steps to collect JFR recording on WebLogic Kubernetes Operator

October 17, 2023 | 1 minute read
Puneeth Prakash
Senior Principal Software Engineer
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Step 1:

Get the pods in Operator Namespace :

Syntax:

kubectl get pods -n <operator_namespace>

Command :

bash-3.2$ kubectl get pods -n sample-weblogic-operator-ns

NAME READY STATUS RESTARTS AGE
weblogic-operator-webhook-b96d4b5d6–7cvqs 1/1 Running 0 71s
weblogic-operator-88fc58c65-jfxs6 1/1 Running 0 71s


Step 2:

Use kubectl exec to get a shell to the Operator Pod container :

Syntax:

kubectl exec -it <operator_pod> -n <operator_namespace> -- /bin/bash

Command: 

bash-3.2$ kubectl exec -it weblogic-operator-88fc58c65-jfxs6 -n sample-weblogic-operator-ns -- /bin/bash

 

Step 3:

Use “jps” command to get list of running java processes:

Command:

bash-5.1$ jps

209 Jps
15 weblogic-kubernetes-operator.jar

 

Step 4:

Start JFR recording using JCMD utility

Syntax:

jcmd <pid> JFR.start duration=<in_seconds> filename=<filename.jfr>

Command: 

bash-5.1$ jcmd 15 JFR.start duration=10s filename=/tmp/my.jfr

15:
Started recording 1. The result will be written to:
/tmp/my.jfr
bash-5.1$ cd /tmp/
bash-5.1$ ls
2023_10_17_03_59_36_15 hsperfdata_oracle hsperfdata_root my.jfr
bash-5.1$ exit
exit

Step 4:

Copy the JFR recording to your local machine:

Syntax:

kubectl cp <pod-id>:<path> <local-path> -n <namespace>

Command: 

bash-3.2$ kubectl -n sample-weblogic-operator-ns cp weblogic-operator-88fc58c65-jfxs6:/tmp/my.jfr ~/Desktop/my.jfr
bash-3.2$

Demo :

 

Puneeth Prakash

Senior Principal Software Engineer


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