minio/cmd/healthcheck-handler.go
Harshavardhana 0879a4f743 rest/storage: Remove racy LastError usage (#8817)
instead perform a liveness check call to
verify if server is online and print relevant
errors.

Also introduce a StorageErr string error type
instead of errors.New() deprecate usage of
VerifyFileError, DeleteFileError for gob,
change in datastructure also requires bump in
storage REST version to v13.

Fixes #8811
2020-01-14 18:45:17 -08:00

101 lines
3.3 KiB
Go

/*
* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"net/http"
"os"
xhttp "github.com/minio/minio/cmd/http"
"github.com/minio/minio/cmd/logger"
)
// ReadinessCheckHandler -- Checks if the quorum number of disks are available.
// For FS - Checks if the backend disk is available
// For Zones - Checks if all the zones have enough read quorum
func ReadinessCheckHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "ReadinessCheckHandler")
objLayer := newObjectLayerWithoutSafeModeFn()
// Service not initialized yet
if objLayer == nil || !objLayer.IsReady(ctx) {
writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
return
}
writeResponse(w, http.StatusOK, nil, mimeNone)
}
// LivenessCheckHandler -- checks if server can reach its disks internally.
// If not, server is considered to have failed and needs to be restarted.
// Liveness probes are used to detect situations where application (minio)
// has gone into a state where it can not recover except by being restarted.
func LivenessCheckHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "LivenessCheckHandler")
objLayer := newObjectLayerWithoutSafeModeFn()
// Service not initialized yet
if objLayer == nil {
// Respond with 200 OK while server initializes to ensure a distributed cluster
// is able to start on orchestration platforms like Docker Swarm.
// Refer https://github.com/minio/minio/issues/8140 for more details.
// Make sure to add server not initialized status in header
w.Header().Set(xhttp.MinIOServerStatus, "server-not-initialized")
writeSuccessResponseHeadersOnly(w)
return
}
if !globalIsXL && !globalIsDistXL {
s := objLayer.StorageInfo(ctx)
if s.Backend.Type == BackendGateway {
if !s.Backend.GatewayOnline {
writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
return
}
writeResponse(w, http.StatusOK, nil, mimeNone)
return
}
}
// For FS and Erasure backend, check if local disks are up.
var erroredDisks int
for _, ep := range globalEndpoints {
for _, endpoint := range ep.Endpoints {
// Check only if local disks are accessible, we do not have
// to reach to rest of the other servers in a distributed setup.
if !endpoint.IsLocal {
continue
}
// Attempt a stat to backend, any error resulting
// from this Stat() operation is considered as backend
// is not available, count them as errors.
if _, err := os.Stat(endpoint.Path); err != nil && os.IsNotExist(err) {
logger.LogIf(ctx, err)
erroredDisks++
}
}
}
// Any errored disks, we let orchestrators take us down.
if erroredDisks > 0 {
writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
return
}
writeResponse(w, http.StatusOK, nil, mimeNone)
}