10b01ac836
This PR adds readiness and liveness endpoints to probe Minio server instance health. Endpoints can only be accessed without authentication and the paths are /minio/health/live and /minio/health/ready for liveness and readiness respectively. The new healthcheck liveness endpoint is used for Docker healthcheck now. Fixes #5357 Fixes #5514 |
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Minio Healthcheck
Minio server exposes two un-authenticated, healthcheck endpoints - liveness probe and readiness probe at /minio/health/live and /minio/health/ready respectively.
Liveness probe
This probe is used to identify situations where the server is running but may not behave optimally, i.e. sluggish response or corrupt backend. Such problems can be only fixed by a restart.
Internally, Minio liveness probe handler does a ListBuckets call. If successful, the server returns 200 OK, otherwise 503 Service Unavailable.
When liveness probe fails, Kubernetes like platforms restart the container.
Sample configuration in a Kubernetes yaml file.
livenessProbe:
httpGet:
path: /minio/health/live
port: 9000
initialDelaySeconds: 10
periodSeconds: 20
Readiness probe
This probe is used to identify situations where the server is not ready to accept requests yet. In most cases, such conditions recover in some time.
Internally, Minio readiness probe handler checks for total go-routines. If the number of go-routines is less than 1000 (threshold), the server returns 200 OK, otherwise 503 Service Unavailable.
Platforms like Kubernetes do not forward traffic to a pod until its readiness probe is successful.
Sample configuration in a Kubernetes yaml file.
livenessProbe:
httpGet:
path: /minio/health/ready
port: 9000
initialDelaySeconds: 10
periodSeconds: 20