Kubernetes postStart lifecycle always failing
You can use readinessProbe as well with the livenessProbe like this:
readinessProbe: httpGet: path: /api/health port: 8080 initialDelaySeconds: 10 periodSeconds: 5 failureThreshold: 8 // for tcpSocket use: readinessProbe: tcpSocket: port: 3306
That is because your command in postStart is sleeping for 10 seconds and your LivenessProbe is configured to fail after 5 seconds.
Maybe increase initialDelaySeconds or add a failureThreshold.