minio/cmd/config.go
Harshavardhana e9b2bf00ad Support MinIO to be deployed on more than 32 nodes (#8492)
This PR implements locking from a global entity into
a more localized set level entity, allowing for locks
to be held only on the resources which are writing
to a collection of disks rather than a global level.

In this process this PR also removes the top-level
limit of 32 nodes to an unlimited number of nodes. This
is a precursor change before bring in bucket expansion.
2019-11-13 12:17:45 -08:00

325 lines
8.6 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 (
"bytes"
"context"
"encoding/json"
"fmt"
"path"
"sort"
"strings"
"time"
"github.com/minio/minio/cmd/config"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/madmin"
)
const (
minioConfigPrefix = "config"
kvPrefix = ".kv"
// Captures all the previous SetKV operations and allows rollback.
minioConfigHistoryPrefix = minioConfigPrefix + "/history"
// MinIO configuration file.
minioConfigFile = "config.json"
// MinIO configuration backup file
minioConfigBackupFile = minioConfigFile + ".backup"
)
func listServerConfigHistory(ctx context.Context, objAPI ObjectLayer, withData bool, count int) (
[]madmin.ConfigHistoryEntry, error) {
var configHistory []madmin.ConfigHistoryEntry
// List all kvs
marker := ""
for {
res, err := objAPI.ListObjects(ctx, minioMetaBucket, minioConfigHistoryPrefix, marker, "", maxObjectList)
if err != nil {
return nil, err
}
for _, obj := range res.Objects {
cfgEntry := madmin.ConfigHistoryEntry{
RestoreID: strings.TrimSuffix(path.Base(obj.Name), kvPrefix),
CreateTime: obj.ModTime, // ModTime is createTime for config history entries.
}
if withData {
data, err := readConfig(ctx, objAPI, obj.Name)
if err != nil {
return nil, err
}
if globalConfigEncrypted {
data, err = madmin.DecryptData(globalActiveCred.String(), bytes.NewReader(data))
if err != nil {
return nil, err
}
}
cfgEntry.Data = string(data)
}
configHistory = append(configHistory, cfgEntry)
count--
if count == 0 {
break
}
}
if !res.IsTruncated {
// We are done here
break
}
marker = res.NextMarker
}
sort.Slice(configHistory, func(i, j int) bool {
return configHistory[i].CreateTime.Before(configHistory[j].CreateTime)
})
return configHistory, nil
}
func delServerConfigHistory(ctx context.Context, objAPI ObjectLayer, uuidKV string) error {
historyFile := pathJoin(minioConfigHistoryPrefix, uuidKV+kvPrefix)
return objAPI.DeleteObject(ctx, minioMetaBucket, historyFile)
}
func readServerConfigHistory(ctx context.Context, objAPI ObjectLayer, uuidKV string) ([]byte, error) {
historyFile := pathJoin(minioConfigHistoryPrefix, uuidKV+kvPrefix)
data, err := readConfig(ctx, objAPI, historyFile)
if err != nil {
return nil, err
}
if globalConfigEncrypted {
data, err = madmin.DecryptData(globalActiveCred.String(), bytes.NewReader(data))
}
return data, err
}
func saveServerConfigHistory(ctx context.Context, objAPI ObjectLayer, kv []byte) error {
uuidKV := mustGetUUID() + kvPrefix
historyFile := pathJoin(minioConfigHistoryPrefix, uuidKV)
var err error
if globalConfigEncrypted {
kv, err = madmin.EncryptData(globalActiveCred.String(), kv)
if err != nil {
return err
}
}
// Save the new config KV settings into the history path.
return saveConfig(ctx, objAPI, historyFile, kv)
}
func saveServerConfig(ctx context.Context, objAPI ObjectLayer, config interface{}, oldConfig interface{}) error {
data, err := json.Marshal(config)
if err != nil {
return err
}
configFile := path.Join(minioConfigPrefix, minioConfigFile)
// Create a backup of the current config
backupConfigFile := path.Join(minioConfigPrefix, minioConfigBackupFile)
var oldData []byte
var freshConfig bool
if oldConfig == nil {
oldData, err = readConfig(ctx, objAPI, configFile)
if err != nil && err != errConfigNotFound {
return err
}
if err == errConfigNotFound {
// Current config not found, so nothing to backup.
freshConfig = true
}
// Do not need to decrypt oldData since we are going to
// save it anyway if freshConfig is false.
} else {
oldData, err = json.Marshal(oldConfig)
if err != nil {
return err
}
if globalConfigEncrypted {
oldData, err = madmin.EncryptData(globalActiveCred.String(), oldData)
if err != nil {
return err
}
}
}
// No need to take backups for fresh setups.
if !freshConfig {
if err = saveConfig(ctx, objAPI, backupConfigFile, oldData); err != nil {
return err
}
}
if globalConfigEncrypted {
data, err = madmin.EncryptData(globalActiveCred.String(), data)
if err != nil {
return err
}
}
// Save the new config in the std config path
return saveConfig(ctx, objAPI, configFile, data)
}
func readServerConfig(ctx context.Context, objAPI ObjectLayer) (config.Config, error) {
configFile := path.Join(minioConfigPrefix, minioConfigFile)
configData, err := readConfig(ctx, objAPI, configFile)
if err != nil {
return nil, err
}
if globalConfigEncrypted {
configData, err = madmin.DecryptData(globalActiveCred.String(), bytes.NewReader(configData))
if err != nil {
if err == madmin.ErrMaliciousData {
return nil, config.ErrInvalidCredentialsBackendEncrypted(nil)
}
return nil, err
}
}
var config = config.New()
if err = json.Unmarshal(configData, &config); err != nil {
return nil, err
}
return config, nil
}
// ConfigSys - config system.
type ConfigSys struct{}
// Load - load config.json.
func (sys *ConfigSys) Load(objAPI ObjectLayer) error {
return sys.Init(objAPI)
}
// WatchConfigNASDisk - watches nas disk on periodic basis.
func (sys *ConfigSys) WatchConfigNASDisk(objAPI ObjectLayer) {
configInterval := globalRefreshIAMInterval
watchDisk := func() {
ticker := time.NewTicker(configInterval)
defer ticker.Stop()
for {
select {
case <-GlobalServiceDoneCh:
return
case <-ticker.C:
loadConfig(objAPI)
}
}
}
// Refresh configSys in background for NAS gateway.
go watchDisk()
}
// Init - initializes config system from config.json.
func (sys *ConfigSys) Init(objAPI ObjectLayer) error {
if objAPI == nil {
return errInvalidArgument
}
doneCh := make(chan struct{})
defer close(doneCh)
// Initializing configuration needs a retry mechanism for
// the following reasons:
// - Read quorum is lost just after the initialization
// of the object layer.
// - Write quorum not met when upgrading configuration
// version is needed.
retryTimerCh := newRetryTimerSimple(doneCh)
for {
select {
case <-retryTimerCh:
if err := initConfig(objAPI); err != nil {
if err == errDiskNotFound ||
strings.Contains(err.Error(), InsufficientReadQuorum{}.Error()) ||
strings.Contains(err.Error(), InsufficientWriteQuorum{}.Error()) {
logger.Info("Waiting for configuration to be initialized..")
continue
}
return err
}
return nil
case <-globalOSSignalCh:
return fmt.Errorf("Initializing config sub-system gracefully stopped")
}
}
}
// NewConfigSys - creates new config system object.
func NewConfigSys() *ConfigSys {
return &ConfigSys{}
}
// Initialize and load config from remote etcd or local config directory
func initConfig(objAPI ObjectLayer) error {
if objAPI == nil {
return errServerNotInitialized
}
if isFile(getConfigFile()) {
if err := migrateConfig(); err != nil {
return err
}
}
// Construct path to config/transaction.lock for locking
transactionConfigPrefix := minioConfigPrefix + "/transaction.lock"
// Hold lock only by one server and let that server alone migrate
// all the config as necessary, this is to ensure that
// redundant locks are not held for each migration - this allows
// for a more predictable behavior while debugging.
objLock := objAPI.NewNSLock(context.Background(), minioMetaBucket, transactionConfigPrefix)
if err := objLock.GetLock(globalOperationTimeout); err != nil {
return err
}
defer objLock.Unlock()
// Migrates ${HOME}/.minio/config.json or config.json.deprecated
// to '<export_path>/.minio.sys/config/config.json'
// ignore if the file doesn't exist.
// If etcd is set then migrates /config/config.json
// to '<export_path>/.minio.sys/config/config.json'
if err := migrateConfigToMinioSys(objAPI); err != nil {
return err
}
// Migrates backend '<export_path>/.minio.sys/config/config.json' to latest version.
if err := migrateMinioSysConfig(objAPI); err != nil {
return err
}
// Migrates backend '<export_path>/.minio.sys/config/config.json' to
// latest config format.
if err := migrateMinioSysConfigToKV(objAPI); err != nil {
return err
}
return loadConfig(objAPI)
}