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Type: Task
Resolution: Done
Priority: Major
Fix Version/s: None
Affects Version/s: None
Component/s: documentation
Labels:
None

Sprint:
SB-2018-09-28, SB-2018-10-12, SB-2018-10-27, SB-2018-11-09, SB-2018-11-23, SB-2018-12-07

The openjdk 8 docker image that we are using to package a Spring Boot app exposes using Jolokia a Servlet to access the JMX/MBeans [1]

Log of the pod --> Jolokia: Agent started with URL https://172.20.5.205:8778/jolokia/

Using this http endpoint, we get JMX infos within the pod

curl -k -u jolokia:THEPASSWORD https://localhost:8778/jolokia/version
--> {"request":{"type":"version"},"value":{"agent":"1.3.6","protocol":"7.2","config":...

or using the Kubernetes Api [1]

http --verify=no https://osemaster.spring-boot.osepool.centralci.eng.rdu2.redhat.com:8443/api/v1/namespaces/cmoulliard/pods/https:spring-boot-rest-http-2-gck73:8778/proxy/jolokia/read/java.lang:type\=Memory/HeapMemoryUsage 'Authorization:Bearer TOKEN'
HTTP/1.1 200 OK
Cache-Control: no-store
Cache-Control: no-cache
Content-Length: 206
Content-Type: text/plain; charset=utf-8
Date: Tue, 14 Nov 2017 11:57:48 GMT
Expires: Tue, 14 Nov 2017 10:57:48 GMT
Pragma: no-cache

{
    "request": {
        "attribute": "HeapMemoryUsage",
        "mbean": "java.lang:type=Memory",
        "type": "read"
    },
    "status": 200,
    "timestamp": 1510660668,
    "value": {
        "committed": 131072000,
        "init": 132120576,
        "max": 131072000,
        "used": 44817232
    }
}

As such feature, collecting JMX Metrics or MBeans info exposed through Spring Boot Actuator is a key success factor to improve the Developer Experience around Kubernetes/Openshift, we should :

Document it and design a How to Guide using https://github.com/snowdrop/spring-boot-jolokia
Extend the use case to install a Management console (Hawkular, ....) to display graphically the metrics/filter, ....
Add this capability to istio in order to collect the infos and inject them into an ElasticSearch DB for Monitoring

See more info about strategies : https://github.com/fabric8-launch/appdev-documentation/issues/891

[1] https://developers.redhat.com/blog/2016/03/30/jolokia-jvm-monitoring-in-openshift/