minio/cmd/admin-handlers.go
2017-02-27 11:40:27 -08:00

824 lines
24 KiB
Go

/*
* Minio Cloud Storage, (C) 2016, 2017 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 (
"bytes"
"encoding/json"
"encoding/xml"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strconv"
"time"
)
const (
minioAdminOpHeader = "X-Minio-Operation"
minioConfigTmpFormat = "config-%s.json"
)
// Type-safe query params.
type mgmtQueryKey string
// Only valid query params for list/clear locks management APIs.
const (
mgmtBucket mgmtQueryKey = "bucket"
mgmtObject mgmtQueryKey = "object"
mgmtPrefix mgmtQueryKey = "prefix"
mgmtLockDuration mgmtQueryKey = "duration"
mgmtDelimiter mgmtQueryKey = "delimiter"
mgmtMarker mgmtQueryKey = "marker"
mgmtMaxKey mgmtQueryKey = "max-key"
mgmtDryRun mgmtQueryKey = "dry-run"
)
// ServerVersion - server version
type ServerVersion struct {
Version string `json:"version"`
CommitID string `json:"commitID"`
}
// ServerStatus - contains the response of service status API
type ServerStatus struct {
ServerVersion ServerVersion `json:"serverVersion"`
Uptime time.Duration `json:"uptime"`
}
// ServiceStatusHandler - GET /?service
// HTTP header x-minio-operation: status
// ----------
// Fetches server status information like total disk space available
// to use, online disks, offline disks and quorum threshold.
func (adminAPI adminAPIHandlers) ServiceStatusHandler(w http.ResponseWriter, r *http.Request) {
adminAPIErr := checkRequestAuthType(r, "", "", "")
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
// Fetch server version
serverVersion := ServerVersion{Version: Version, CommitID: CommitID}
// Fetch uptimes from all peers. This may fail to due to lack
// of read-quorum availability.
uptime, err := getPeerUptimes(globalAdminPeers)
if err != nil {
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
errorIf(err, "Possibly failed to get uptime from majority of servers.")
return
}
// Create API response
serverStatus := ServerStatus{
ServerVersion: serverVersion,
Uptime: uptime,
}
// Marshal API response
jsonBytes, err := json.Marshal(serverStatus)
if err != nil {
writeErrorResponse(w, ErrInternalError, r.URL)
errorIf(err, "Failed to marshal storage info into json.")
return
}
// Reply with storage information (across nodes in a
// distributed setup) as json.
writeSuccessResponseJSON(w, jsonBytes)
}
// ServiceRestartHandler - POST /?service
// HTTP header x-minio-operation: restart
// ----------
// Restarts minio server gracefully. In a distributed setup, restarts
// all the servers in the cluster.
func (adminAPI adminAPIHandlers) ServiceRestartHandler(w http.ResponseWriter, r *http.Request) {
adminAPIErr := checkRequestAuthType(r, "", "", "")
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
// Reply to the client before restarting minio server.
writeSuccessResponseHeadersOnly(w)
sendServiceCmd(globalAdminPeers, serviceRestart)
}
// setCredsReq request
type setCredsReq struct {
Username string `xml:"username"`
Password string `xml:"password"`
}
// ServiceCredsHandler - POST /?service
// HTTP header x-minio-operation: creds
// ----------
// Update credentials in a minio server. In a distributed setup, update all the servers
// in the cluster.
func (adminAPI adminAPIHandlers) ServiceCredentialsHandler(w http.ResponseWriter, r *http.Request) {
// Authenticate request
adminAPIErr := checkRequestAuthType(r, "", "", "")
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
// Avoid setting new credentials when they are already passed
// by the environment.
if globalIsEnvCreds {
writeErrorResponse(w, ErrMethodNotAllowed, r.URL)
return
}
// Load request body
inputData, err := ioutil.ReadAll(r.Body)
if err != nil {
writeErrorResponse(w, ErrInternalError, r.URL)
return
}
// Unmarshal request body
var req setCredsReq
err = xml.Unmarshal(inputData, &req)
if err != nil {
errorIf(err, "Cannot unmarshal credentials request")
writeErrorResponse(w, ErrMalformedXML, r.URL)
return
}
// Check passed credentials
err = validateAuthKeys(req.Username, req.Password)
if err != nil {
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
creds := credential{
AccessKey: req.Username,
SecretKey: req.Password,
}
// Notify all other Minio peers to update credentials
updateErrs := updateCredsOnPeers(creds)
for peer, err := range updateErrs {
errorIf(err, "Unable to update credentials on peer %s.", peer)
}
// Update local credentials in memory.
serverConfig.SetCredential(creds)
if err = serverConfig.Save(); err != nil {
writeErrorResponse(w, ErrInternalError, r.URL)
return
}
// At this stage, the operation is successful, return 200 OK
w.WriteHeader(http.StatusOK)
}
// ServerProperties holds some server information such as, version, region
// uptime, etc..
type ServerProperties struct {
Uptime time.Duration `json:"uptime"`
Version string `json:"version"`
CommitID string `json:"commitID"`
Region string `json:"region"`
SQSARN []string `json:"sqsARN"`
}
// ServerConnStats holds transferred bytes from/to the server
type ServerConnStats struct {
TotalInputBytes uint64 `json:"transferred"`
TotalOutputBytes uint64 `json:"received"`
Throughput uint64 `json:"throughput,omitempty"`
}
// ServerInfo holds the information that will be returned by ServerInfo API
type ServerInfo struct {
StorageInfo StorageInfo `json:"storage"`
ConnStats ServerConnStats `json:"network"`
Properties ServerProperties `json:"server"`
}
// ServerInfoHandler - GET /?server-info
// ----------
// Get server information
func (adminAPI adminAPIHandlers) ServerInfoHandler(w http.ResponseWriter, r *http.Request) {
// Authenticate request
adminAPIErr := checkRequestAuthType(r, "", "", "")
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
// Build storage info
objLayer := newObjectLayerFn()
if objLayer == nil {
writeErrorResponse(w, ErrServerNotInitialized, r.URL)
return
}
storage := objLayer.StorageInfo()
// Build list of enabled ARNs queues
var arns []string
for queueArn := range globalEventNotifier.GetAllExternalTargets() {
arns = append(arns, queueArn)
}
// Fetch uptimes from all peers. This may fail to due to lack
// of read-quorum availability.
uptime, err := getPeerUptimes(globalAdminPeers)
if err != nil {
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
errorIf(err, "Unable to get uptime from majority of servers.")
return
}
// Build server properties information
properties := ServerProperties{
Version: Version,
CommitID: CommitID,
Region: serverConfig.GetRegion(),
SQSARN: arns,
Uptime: uptime,
}
// Build network info
connStats := ServerConnStats{
TotalInputBytes: globalConnStats.getTotalInputBytes(),
TotalOutputBytes: globalConnStats.getTotalOutputBytes(),
}
// Build the whole returned information
info := ServerInfo{
StorageInfo: storage,
ConnStats: connStats,
Properties: properties,
}
// Marshal API response
jsonBytes, err := json.Marshal(info)
if err != nil {
writeErrorResponse(w, ErrInternalError, r.URL)
errorIf(err, "Failed to marshal storage info into json.")
return
}
// Reply with storage information (across nodes in a
// distributed setup) as json.
writeSuccessResponseJSON(w, jsonBytes)
}
// validateLockQueryParams - Validates query params for list/clear locks management APIs.
func validateLockQueryParams(vars url.Values) (string, string, time.Duration, APIErrorCode) {
bucket := vars.Get(string(mgmtBucket))
prefix := vars.Get(string(mgmtPrefix))
durationStr := vars.Get(string(mgmtLockDuration))
// N B empty bucket name is invalid
if !IsValidBucketName(bucket) {
return "", "", time.Duration(0), ErrInvalidBucketName
}
// empty prefix is valid.
if !IsValidObjectPrefix(prefix) {
return "", "", time.Duration(0), ErrInvalidObjectName
}
// If older-than parameter was empty then set it to 0s to list
// all locks older than now.
if durationStr == "" {
durationStr = "0s"
}
duration, err := time.ParseDuration(durationStr)
if err != nil {
errorIf(err, "Failed to parse duration passed as query value.")
return "", "", time.Duration(0), ErrInvalidDuration
}
return bucket, prefix, duration, ErrNone
}
// ListLocksHandler - GET /?lock&bucket=mybucket&prefix=myprefix&duration=duration
// - bucket is a mandatory query parameter
// - prefix and older-than are optional query parameters
// HTTP header x-minio-operation: list
// ---------
// Lists locks held on a given bucket, prefix and duration it was held for.
func (adminAPI adminAPIHandlers) ListLocksHandler(w http.ResponseWriter, r *http.Request) {
adminAPIErr := checkRequestAuthType(r, "", "", "")
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
vars := r.URL.Query()
bucket, prefix, duration, adminAPIErr := validateLockQueryParams(vars)
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
// Fetch lock information of locks matching bucket/prefix that
// are available for longer than duration.
volLocks, err := listPeerLocksInfo(globalAdminPeers, bucket, prefix, duration)
if err != nil {
writeErrorResponse(w, ErrInternalError, r.URL)
errorIf(err, "Failed to fetch lock information from remote nodes.")
return
}
// Marshal list of locks as json.
jsonBytes, err := json.Marshal(volLocks)
if err != nil {
writeErrorResponse(w, ErrInternalError, r.URL)
errorIf(err, "Failed to marshal lock information into json.")
return
}
// Reply with list of locks held on bucket, matching prefix
// held longer than duration supplied, as json.
writeSuccessResponseJSON(w, jsonBytes)
}
// ClearLocksHandler - POST /?lock&bucket=mybucket&prefix=myprefix&duration=duration
// - bucket is a mandatory query parameter
// - prefix and older-than are optional query parameters
// HTTP header x-minio-operation: clear
// ---------
// Clear locks held on a given bucket, prefix and duration it was held for.
func (adminAPI adminAPIHandlers) ClearLocksHandler(w http.ResponseWriter, r *http.Request) {
adminAPIErr := checkRequestAuthType(r, "", "", "")
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
vars := r.URL.Query()
bucket, prefix, duration, adminAPIErr := validateLockQueryParams(vars)
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
// Fetch lock information of locks matching bucket/prefix that
// are held for longer than duration.
volLocks, err := listPeerLocksInfo(globalAdminPeers, bucket, prefix, duration)
if err != nil {
writeErrorResponse(w, ErrInternalError, r.URL)
errorIf(err, "Failed to fetch lock information from remote nodes.")
return
}
// Marshal list of locks as json.
jsonBytes, err := json.Marshal(volLocks)
if err != nil {
writeErrorResponse(w, ErrInternalError, r.URL)
errorIf(err, "Failed to marshal lock information into json.")
return
}
// Remove lock matching bucket/prefix held longer than duration.
for _, volLock := range volLocks {
globalNSMutex.ForceUnlock(volLock.Bucket, volLock.Object)
}
// Reply with list of locks cleared, as json.
writeSuccessResponseJSON(w, jsonBytes)
}
// validateHealQueryParams - Validates query params for heal list management API.
func validateHealQueryParams(vars url.Values) (string, string, string, string, int, APIErrorCode) {
bucket := vars.Get(string(mgmtBucket))
prefix := vars.Get(string(mgmtPrefix))
marker := vars.Get(string(mgmtMarker))
delimiter := vars.Get(string(mgmtDelimiter))
maxKeyStr := vars.Get(string(mgmtMaxKey))
// N B empty bucket name is invalid
if !IsValidBucketName(bucket) {
return "", "", "", "", 0, ErrInvalidBucketName
}
// empty prefix is valid.
if !IsValidObjectPrefix(prefix) {
return "", "", "", "", 0, ErrInvalidObjectName
}
// check if maxKey is a valid integer.
maxKey, err := strconv.Atoi(maxKeyStr)
if err != nil {
return "", "", "", "", 0, ErrInvalidMaxKeys
}
// Validate prefix, marker, delimiter and maxKey.
apiErr := validateListObjectsArgs(prefix, marker, delimiter, maxKey)
if apiErr != ErrNone {
return "", "", "", "", 0, apiErr
}
return bucket, prefix, marker, delimiter, maxKey, ErrNone
}
// ListObjectsHealHandler - GET /?heal&bucket=mybucket&prefix=myprefix&marker=mymarker&delimiter=&mydelimiter&maxKey=1000
// - bucket is mandatory query parameter
// - rest are optional query parameters
// List upto maxKey objects that need healing in a given bucket matching the given prefix.
func (adminAPI adminAPIHandlers) ListObjectsHealHandler(w http.ResponseWriter, r *http.Request) {
// Get object layer instance.
objLayer := newObjectLayerFn()
if objLayer == nil {
writeErrorResponse(w, ErrServerNotInitialized, r.URL)
return
}
// Validate request signature.
adminAPIErr := checkRequestAuthType(r, "", "", "")
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
// Validate query params.
vars := r.URL.Query()
bucket, prefix, marker, delimiter, maxKey, adminAPIErr := validateHealQueryParams(vars)
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
// Get the list objects to be healed.
objectInfos, err := objLayer.ListObjectsHeal(bucket, prefix, marker, delimiter, maxKey)
if err != nil {
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
listResponse := generateListObjectsV1Response(bucket, prefix, marker, delimiter, maxKey, objectInfos)
// Write success response.
writeSuccessResponseXML(w, encodeResponse(listResponse))
}
// ListBucketsHealHandler - GET /?heal
func (adminAPI adminAPIHandlers) ListBucketsHealHandler(w http.ResponseWriter, r *http.Request) {
// Get object layer instance.
objLayer := newObjectLayerFn()
if objLayer == nil {
writeErrorResponse(w, ErrServerNotInitialized, r.URL)
return
}
// Validate request signature.
adminAPIErr := checkRequestAuthType(r, "", "", "")
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
// Get the list buckets to be healed.
bucketsInfo, err := objLayer.ListBucketsHeal()
if err != nil {
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
listResponse := generateListBucketsResponse(bucketsInfo)
// Write success response.
writeSuccessResponseXML(w, encodeResponse(listResponse))
}
// HealBucketHandler - POST /?heal&bucket=mybucket&dry-run
// - x-minio-operation = bucket
// - bucket is mandatory query parameter
// Heal a given bucket, if present.
func (adminAPI adminAPIHandlers) HealBucketHandler(w http.ResponseWriter, r *http.Request) {
// Get object layer instance.
objLayer := newObjectLayerFn()
if objLayer == nil {
writeErrorResponse(w, ErrServerNotInitialized, r.URL)
return
}
// Validate request signature.
adminAPIErr := checkRequestAuthType(r, "", "", "")
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
// Validate bucket name and check if it exists.
vars := r.URL.Query()
bucket := vars.Get(string(mgmtBucket))
if err := checkBucketExist(bucket, objLayer); err != nil {
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
// if dry-run is present in query-params, then only perform validations and return success.
if isDryRun(vars) {
writeSuccessResponseHeadersOnly(w)
return
}
// Heal the given bucket.
err := objLayer.HealBucket(bucket)
if err != nil {
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
// Return 200 on success.
writeSuccessResponseHeadersOnly(w)
}
// isDryRun - returns true if dry-run query param was set and false otherwise.
// otherwise.
func isDryRun(qval url.Values) bool {
if _, dryRun := qval[string(mgmtDryRun)]; dryRun {
return true
}
return false
}
// HealObjectHandler - POST /?heal&bucket=mybucket&object=myobject&dry-run
// - x-minio-operation = object
// - bucket and object are both mandatory query parameters
// Heal a given object, if present.
func (adminAPI adminAPIHandlers) HealObjectHandler(w http.ResponseWriter, r *http.Request) {
// Get object layer instance.
objLayer := newObjectLayerFn()
if objLayer == nil {
writeErrorResponse(w, ErrServerNotInitialized, r.URL)
return
}
// Validate request signature.
adminAPIErr := checkRequestAuthType(r, "", "", "")
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
vars := r.URL.Query()
bucket := vars.Get(string(mgmtBucket))
object := vars.Get(string(mgmtObject))
// Validate bucket and object names.
if err := checkBucketAndObjectNames(bucket, object); err != nil {
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
// Check if object exists.
if _, err := objLayer.GetObjectInfo(bucket, object); err != nil {
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
// if dry-run is set in query params then perform validations
// and return success.
if isDryRun(vars) {
writeSuccessResponseHeadersOnly(w)
return
}
err := objLayer.HealObject(bucket, object)
if err != nil {
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
// Return 200 on success.
writeSuccessResponseHeadersOnly(w)
}
// HealFormatHandler - POST /?heal&dry-run
// - x-minio-operation = format
// - bucket and object are both mandatory query parameters
// Heal a given object, if present.
func (adminAPI adminAPIHandlers) HealFormatHandler(w http.ResponseWriter, r *http.Request) {
// Get current object layer instance.
objectAPI := newObjectLayerFn()
if objectAPI == nil {
writeErrorResponse(w, ErrServerNotInitialized, r.URL)
return
}
// Validate request signature.
adminAPIErr := checkRequestAuthType(r, "", "", "")
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
// Check if this setup is an erasure code backend, since
// heal-format is only applicable to single node XL and
// distributed XL setup.
if !globalIsXL {
writeErrorResponse(w, ErrNotImplemented, r.URL)
return
}
// if dry-run is set in query-params, return success as
// validations are successful so far.
vars := r.URL.Query()
if isDryRun(vars) {
writeSuccessResponseHeadersOnly(w)
return
}
// Create a new set of storage instances to heal format.json.
bootstrapDisks, err := initStorageDisks(globalEndpoints)
if err != nil {
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
// Heal format.json on available storage.
err = healFormatXL(bootstrapDisks)
if err != nil {
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
// Instantiate new object layer with newly formatted storage.
newObjectAPI, err := newXLObjects(bootstrapDisks)
if err != nil {
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
// Set object layer with newly formatted storage to globalObjectAPI.
globalObjLayerMutex.Lock()
globalObjectAPI = newObjectAPI
globalObjLayerMutex.Unlock()
// Shutdown storage belonging to old object layer instance.
objectAPI.Shutdown()
// Inform peers to reinitialize storage with newly formatted storage.
reInitPeerDisks(globalAdminPeers)
// Return 200 on success.
writeSuccessResponseHeadersOnly(w)
}
// GetConfigHandler - GET /?config
// - x-minio-operation = get
// Get config.json of this minio setup.
func (adminAPI adminAPIHandlers) GetConfigHandler(w http.ResponseWriter, r *http.Request) {
// Validate request signature.
adminAPIErr := checkRequestAuthType(r, "", "", "")
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
// check if objectLayer is initialized, if not return.
if newObjectLayerFn() == nil {
writeErrorResponse(w, ErrServerNotInitialized, r.URL)
return
}
// Get config.json from all nodes. In a single node setup, it
// returns local config.json.
configBytes, err := getPeerConfig(globalAdminPeers)
if err != nil {
errorIf(err, "Failed to get config from peers")
writeErrorResponse(w, toAdminAPIErrCode(err), r.URL)
return
}
writeSuccessResponseJSON(w, configBytes)
}
// toAdminAPIErrCode - converts errXLWriteQuorum error to admin API
// specific error.
func toAdminAPIErrCode(err error) APIErrorCode {
switch err {
case errXLWriteQuorum:
return ErrAdminConfigNoQuorum
}
return toAPIErrorCode(err)
}
// SetConfigResult - represents detailed results of a set-config
// operation.
type nodeSummary struct {
Name string `json:"name"`
Err string `json:"err"`
}
type setConfigResult struct {
NodeResults []nodeSummary `json:"nodeResults"`
Status bool `json:"status"`
}
// writeSetConfigResponse - writes setConfigResult value as json depending on the status.
func writeSetConfigResponse(w http.ResponseWriter, peers adminPeers, errs []error, status bool, reqURL *url.URL) {
var nodeResults []nodeSummary
// Build nodeResults based on error values received during
// set-config operation.
for i := range errs {
nodeResults = append(nodeResults, nodeSummary{
Name: peers[i].addr,
Err: fmt.Sprintf("%v", errs[i]),
})
}
result := setConfigResult{
Status: status,
NodeResults: nodeResults,
}
// The following elaborate json encoding is to avoid escaping
// '<', '>' in <nil>. Note: json.Encoder.Encode() adds a
// gratuitous "\n".
var resultBuf bytes.Buffer
enc := json.NewEncoder(&resultBuf)
enc.SetEscapeHTML(false)
jsonErr := enc.Encode(result)
if jsonErr != nil {
writeErrorResponse(w, toAPIErrorCode(jsonErr), reqURL)
return
}
writeSuccessResponseJSON(w, resultBuf.Bytes())
return
}
// SetConfigHandler - PUT /?config
// - x-minio-operation = set
func (adminAPI adminAPIHandlers) SetConfigHandler(w http.ResponseWriter, r *http.Request) {
// Get current object layer instance.
objectAPI := newObjectLayerFn()
if objectAPI == nil {
writeErrorResponse(w, ErrServerNotInitialized, r.URL)
return
}
// Validate request signature.
adminAPIErr := checkRequestAuthType(r, "", "", "")
if adminAPIErr != ErrNone {
writeErrorResponse(w, adminAPIErr, r.URL)
return
}
// Read configuration bytes from request body.
configBytes, err := ioutil.ReadAll(r.Body)
if err != nil {
errorIf(err, "Failed to read config from request body.")
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
return
}
// Write config received from request onto a temporary file on
// all nodes.
tmpFileName := fmt.Sprintf(minioConfigTmpFormat, mustGetUUID())
errs := writeTmpConfigPeers(globalAdminPeers, tmpFileName, configBytes)
// Check if the operation succeeded in quorum or more nodes.
rErr := reduceWriteQuorumErrs(errs, nil, len(globalAdminPeers)/2+1)
if rErr != nil {
writeSetConfigResponse(w, globalAdminPeers, errs, false, r.URL)
return
}
// Take a lock on minio/config.json. NB minio is a reserved
// bucket name and wouldn't conflict with normal object
// operations.
configLock := globalNSMutex.NewNSLock(minioReservedBucket, globalMinioConfigFile)
configLock.Lock()
defer configLock.Unlock()
// Rename the temporary config file to config.json
errs = commitConfigPeers(globalAdminPeers, tmpFileName)
rErr = reduceWriteQuorumErrs(errs, nil, len(globalAdminPeers)/2+1)
if rErr != nil {
writeSetConfigResponse(w, globalAdminPeers, errs, false, r.URL)
return
}
// serverMux (cmd/server-mux.go) implements graceful shutdown,
// where all listeners are closed and process restart/shutdown
// happens after 5s or completion of all ongoing http
// requests, whichever is earlier.
writeSetConfigResponse(w, globalAdminPeers, errs, true, r.URL)
// Restart all node for the modified config to take effect.
sendServiceCmd(globalAdminPeers, serviceRestart)
}