As a developer, I want the social-app-template-backend to have a HealthController that can be queried for health, livez, and readyz. The HealthController should check that all micro-services are available before making the backend state ready.
Discussion
At startup, social-app-template-backend should check each micro-service readyz endpoint in a while loop that will wait forever, if a micro-service is not available. Once this check is completed, the backend can enable the readyz endpoint.
Reasoning:
Availability of the content-watcher (or other micro-services) is not an internal application error, and likely will not be fixed by the service being restarted.
Why /readyz instead of /livez? Same as above--/livez failure would cause K8s to restart the pod; this likely won't help the situation. But /readyz failure should prevent us from routing traffic to the pod until it is fully up.
Acceptance Criteria
[ ] social-app-template-backend should check the health of all the micro-services.
[ ] The social-app-template-backend readiness probe /readyz shall be dependent on all micro-services successfully completing a health check.
As a developer, I want the
social-app-template-backendto have aHealthControllerthat can be queried forhealth,livez, andreadyz. TheHealthControllershould check that all micro-services are available before making the backend state ready.Discussion
At startup,
social-app-template-backendshould check each micro-servicereadyzendpoint in a while loop that will wait forever, if a micro-service is not available. Once this check is completed, the backend can enable thereadyzendpoint.Reasoning:
Availability of the content-watcher (or other micro-services) is not an internal application error, and likely will not be fixed by the service being restarted.
Why
/readyzinstead of/livez? Same as above--/livezfailure would cause K8s to restart the pod; this likely won't help the situation. But/readyzfailure should prevent us from routing traffic to the pod until it is fully up.Acceptance Criteria
social-app-template-backendshould check the health of all the micro-services.social-app-template-backendreadiness probe/readyzshall be dependent on all micro-services successfully completing a health check.