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read-health check endpoint returns success if cluster can serve read requests (#11310)

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Krishna Srinivas
2021-02-09 01:00:44 -08:00
committed by GitHub
parent 3d74efa6b1
commit 876b79b8d8
8 changed files with 98 additions and 7 deletions
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21
docs/metrics/healthcheck/README.md
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@@ -20,7 +20,8 @@ livenessProbe:
```
### Cluster probe
This probe is not useful in almost all cases, this is meant for administrators to see if quorum is available in any given cluster. The reply is '200 OK' if cluster has quorum if not it returns '503 Service Unavailable'.
#### Cluster-writeable probe
This probe is not useful in almost all cases, this is meant for administrators to see if write quorum is available in any given cluster. The reply is '200 OK' if cluster has write quorum if not it returns '503 Service Unavailable'.
```
curl http://minio1:9001/minio/health/cluster
@@ -37,6 +38,24 @@ X-Xss-Protection: 1; mode=block
Date: Tue, 21 Jul 2020 00:36:14 GMT
```
#### Clustr-readable probe
This probe is not useful in almost all cases, this is meant for administrators to see if read quorum is available in any given cluster. The reply is '200 OK' if cluster has read quorum if not it returns '503 Service Unavailable'.
```
curl http://minio1:9001/minio/health/cluster/read
HTTP/1.1 503 Service Unavailable
Accept-Ranges: bytes
Content-Length: 0
Content-Security-Policy: block-all-mixed-content
Server: MinIO/GOGET.GOGET
Vary: Origin
X-Amz-Bucket-Region: us-east-1
X-Minio-Write-Quorum: 3
X-Amz-Request-Id: 16239D6AB80EBECF
X-Xss-Protection: 1; mode=block
Date: Tue, 21 Jul 2020 00:36:14 GMT
```
#### Checking cluster health for maintenance
You may query the cluster probe endpoint to check if the node which received the request can be taken down for maintenance, if the server replies back '412 Precondition Failed' this means you will lose HA. '200 OK' means you are okay to proceed.