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Configure-applications-for-reliability.md

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Configure applications for reliability

This excercise assumes you have an application with existing readyness and health endpoints.
I found a project that can be deployed with this functionality

  • Create new project and deploy application
oc new-project health-and-readyness                                          
Now using project "health-and-readyness" on server "https://api.crc.testing:6443".

oc new-app \
--name probes --context-dir probes --build-env \
npm_config_registry=http://nexus-common.apps.na410.prod.nextcle.com/repository/nodejs \
nodejs:16-ubi8~https://github.com/tsrana/DO288-apps

Wait for app to start (can take > 4 minutes in CRC)

oc get pods                                                                                       llevy-mac: 

NAME                          READY   STATUS      RESTARTS   AGE
pod/probes-1-build            0/1     Completed   0          7m40s
pod/probes-5f84f4b7f9-jschr   1/1     Running     0          6m29s

Expose service and test the ready and healthz endpoints

❯ oc expose service/probes  
route.route.openshift.io/probes exposed

❯ curl probes-health-and-readyness.apps-crc.testing                                     
Hello! This is the index page for the app.

❯ curl probes-health-and-readyness.apps-crc.testing/ready
Ready for service requests...

❯ curl probes-health-and-readyness.apps-crc.testing/healthz
OK

❯ curl probes-health-and-readyness.apps-crc.testing/ready -i
HTTP/1.1 200 OK
x-powered-by: Express
content-type: text/html; charset=utf-8
content-length: 30
etag: W/"1e-ANVsNjd6wx5bS7ZhAUO+mQ"
date: Fri, 08 Sep 2023 17:34:28 GMT
keep-alive: timeout=5
set-cookie: fbc6880d0c2a839105b7441f06647354=d910f70e9695219c85a4bb38b9f325f7; path=/; HttpOnly
cache-control: private

Ready for service requests...

❯ curl probes-health-and-readyness.apps-crc.testing/healthz -i
HTTP/1.1 200 OK
x-powered-by: Express
content-type: text/html; charset=utf-8
content-length: 3
etag: W/"3-02+PlCXEqAAK2cSpcYWspQ"
date: Fri, 08 Sep 2023 17:34:34 GMT
keep-alive: timeout=5
set-cookie: fbc6880d0c2a839105b7441f06647354=d910f70e9695219c85a4bb38b9f325f7; path=/; HttpOnly
cache-control: private

OK

  • Add health and readyness probes to deployment

  • Test probes by going to the url
    http://probes-health-and-readyness.apps-crc.testing/flip?op=kill

This will put the app in an unhealthy state and it will redeploy in a few seconds.
Monitor with the watch oc get pods command

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