267f183fc8
Health checking programs very frequently use /minio/health/live to check health, hence we can avoid doing StorageInfo() and ListBuckets() for FS/Erasure backend.
109 lines
3.5 KiB
Go
109 lines
3.5 KiB
Go
/*
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* Minio Cloud Storage, (C) 2018 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"fmt"
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"net/http"
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"os"
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"runtime"
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"github.com/minio/minio/cmd/logger"
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)
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const (
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minioHealthGoroutineThreshold = 1000
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)
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// ReadinessCheckHandler -- checks if there are more than threshold number of goroutines running,
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// returns service unavailable.
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// Readiness probes are used to detect situations where application is under heavy load
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// and temporarily unable to serve. In a orchestrated setup like Kubernetes, containers reporting
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// that they are not ready do not receive traffic through Kubernetes Services.
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func ReadinessCheckHandler(w http.ResponseWriter, r *http.Request) {
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if err := goroutineCountCheck(minioHealthGoroutineThreshold); err != nil {
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writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
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return
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}
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writeResponse(w, http.StatusOK, nil, mimeNone)
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}
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// LivenessCheckHandler -- checks if server can reach its disks internally.
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// If not, server is considered to have failed and needs to be restarted.
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// Liveness probes are used to detect situations where application (minio)
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// has gone into a state where it can not recover except by being restarted.
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func LivenessCheckHandler(w http.ResponseWriter, r *http.Request) {
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ctx := newContext(r, w, "LivenessCheckHandler")
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objLayer := newObjectLayerFn()
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// Service not initialized yet
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if objLayer == nil {
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writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
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return
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}
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if !globalIsXL && !globalIsDistXL {
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s := objLayer.StorageInfo(ctx)
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// Gateways don't provide disk info.
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if s.Backend.Type == Unknown {
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// ListBuckets to confirm gateway backend is up
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if _, err := objLayer.ListBuckets(ctx); err != nil {
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writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
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return
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}
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writeResponse(w, http.StatusOK, nil, mimeNone)
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return
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}
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}
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// For FS and Erasure backend, check if local disks are up.
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var totalLocalDisks int
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var erroredDisks int
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for _, endpoint := range globalEndpoints {
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// Check only if local disks are accessible, we do not have
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// to reach to rest of the other servers in a distributed setup.
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if endpoint.IsLocal {
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totalLocalDisks++
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// Attempt a stat to backend, any error resulting
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// from this Stat() operation is considered as backend
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// is not available, count them as errors.
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if _, err := os.Stat(endpoint.Path); err != nil {
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logger.LogIf(ctx, err)
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erroredDisks++
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}
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}
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}
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// If all exported local disks have errored, we simply let kubernetes
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// take us down.
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if totalLocalDisks == erroredDisks {
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writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
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return
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}
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writeResponse(w, http.StatusOK, nil, mimeNone)
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}
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// checks threshold against total number of go-routines in the system and throws error if
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// more than threshold go-routines are running.
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func goroutineCountCheck(threshold int) error {
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count := runtime.NumGoroutine()
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if count > threshold {
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return fmt.Errorf("too many goroutines (%d > %d)", count, threshold)
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}
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return nil
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}
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