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minio/cmd/server-main.go

554 lines
18 KiB

/*
* MinIO Cloud Storage, (C) 2015-2019 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 (
"bufio"
"context"
"errors"
"fmt"
"io"
"log"
"net"
"os"
"os/signal"
"strings"
"syscall"
"time"
"github.com/minio/cli"
"github.com/minio/minio/cmd/config"
xhttp "github.com/minio/minio/cmd/http"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/auth"
"github.com/minio/minio/pkg/certs"
"github.com/minio/minio/pkg/color"
"github.com/minio/minio/pkg/env"
"github.com/minio/minio/pkg/retry"
)
// ServerFlags - server command specific flags
var ServerFlags = []cli.Flag{
cli.StringFlag{
Name: "address",
Value: ":" + GlobalMinioDefaultPort,
Usage: "bind to a specific ADDRESS:PORT, ADDRESS can be an IP or hostname",
},
}
var serverCmd = cli.Command{
Name: "server",
Usage: "start object storage server",
Flags: append(ServerFlags, GlobalFlags...),
Action: serverMain,
CustomHelpTemplate: `NAME:
{{.HelpName}} - {{.Usage}}
USAGE:
{{.HelpName}} {{if .VisibleFlags}}[FLAGS] {{end}}DIR1 [DIR2..]
{{.HelpName}} {{if .VisibleFlags}}[FLAGS] {{end}}DIR{1...64}
{{.HelpName}} {{if .VisibleFlags}}[FLAGS] {{end}}DIR{1...64} DIR{65...128}
DIR:
DIR points to a directory on a filesystem. When you want to combine
multiple drives into a single large system, pass one directory per
filesystem separated by space. You may also use a '...' convention
to abbreviate the directory arguments. Remote directories in a
distributed setup are encoded as HTTP(s) URIs.
{{if .VisibleFlags}}
FLAGS:
{{range .VisibleFlags}}{{.}}
{{end}}{{end}}
EXAMPLES:
1. Start minio server on "/home/shared" directory.
{{.Prompt}} {{.HelpName}} /home/shared
2. Start single node server with 64 local drives "/mnt/data1" to "/mnt/data64".
{{.Prompt}} {{.HelpName}} /mnt/data{1...64}
3. Start distributed minio server on an 32 node setup with 32 drives each, run following command on all the nodes
{{.Prompt}} {{.EnvVarSetCommand}} MINIO_ACCESS_KEY{{.AssignmentOperator}}minio
{{.Prompt}} {{.EnvVarSetCommand}} MINIO_SECRET_KEY{{.AssignmentOperator}}miniostorage
{{.Prompt}} {{.HelpName}} http://node{1...32}.example.com/mnt/export{1...32}
4. Start distributed minio server in an expanded setup, run the following command on all the nodes
{{.Prompt}} {{.EnvVarSetCommand}} MINIO_ACCESS_KEY{{.AssignmentOperator}}minio
{{.Prompt}} {{.EnvVarSetCommand}} MINIO_SECRET_KEY{{.AssignmentOperator}}miniostorage
{{.Prompt}} {{.HelpName}} http://node{1...16}.example.com/mnt/export{1...32} \
http://node{17...64}.example.com/mnt/export{1...64}
`,
}
// Checks if endpoints are either available through environment
// or command line, returns false if both fails.
func endpointsPresent(ctx *cli.Context) bool {
endpoints := env.Get(config.EnvEndpoints, strings.Join(ctx.Args(), config.ValueSeparator))
return len(endpoints) != 0
}
func serverHandleCmdArgs(ctx *cli.Context) {
// Handle common command args.
handleCommonCmdArgs(ctx)
logger.FatalIf(CheckLocalServerAddr(globalCLIContext.Addr), "Unable to validate passed arguments")
var setupType SetupType
var err error
globalMinioAddr = globalCLIContext.Addr
globalMinioHost, globalMinioPort = mustSplitHostPort(globalMinioAddr)
endpoints := strings.Fields(env.Get(config.EnvEndpoints, ""))
if len(endpoints) > 0 {
globalEndpoints, globalXLSetDriveCount, setupType, err = createServerEndpoints(globalCLIContext.Addr, endpoints...)
} else {
globalEndpoints, globalXLSetDriveCount, setupType, err = createServerEndpoints(globalCLIContext.Addr, ctx.Args()...)
}
logger.FatalIf(err, "Invalid command line arguments")
// On macOS, if a process already listens on LOCALIPADDR:PORT, net.Listen() falls back
// to IPv6 address ie minio will start listening on IPv6 address whereas another
// (non-)minio process is listening on IPv4 of given port.
// To avoid this error situation we check for port availability.
logger.FatalIf(checkPortAvailability(globalMinioHost, globalMinioPort), "Unable to start the server")
globalIsXL = (setupType == XLSetupType)
globalIsDistXL = (setupType == DistXLSetupType)
if globalIsDistXL {
globalIsXL = true
}
}
func serverHandleEnvVars() {
// Handle common environment variables.
handleCommonEnvVars()
}
func newAllSubsystems() {
// Create new notification system and initialize notification targets
globalNotificationSys = NewNotificationSys(globalEndpoints)
// Create new bucket metadata system.
globalBucketMetadataSys = NewBucketMetadataSys()
// Create a new config system.
globalConfigSys = NewConfigSys()
// Create new IAM system.
globalIAMSys = NewIAMSys()
// Create new policy system.
globalPolicySys = NewPolicySys()
// Create new lifecycle system.
globalLifecycleSys = NewLifecycleSys()
// Create new bucket encryption subsystem
globalBucketSSEConfigSys = NewBucketSSEConfigSys()
// Create new bucket object lock subsystem
globalBucketObjectLockSys = NewBucketObjectLockSys()
// Create new bucket quota subsystem
globalBucketQuotaSys = NewBucketQuotaSys()
}
func initSafeMode(ctx context.Context, newObject ObjectLayer) (err error) {
// Create cancel context to control 'newRetryTimer' go routine.
retryCtx, cancel := context.WithCancel(ctx)
// Indicate to our routine to exit cleanly upon return.
defer cancel()
// Make sure to hold lock for entire migration to avoid
// such that only one server should migrate the entire config
// at a given time, this big transaction lock ensures this
// appropriately. This is also true for rotation of encrypted
// content.
txnLk := newObject.NewNSLock(retryCtx, minioMetaBucket, minioConfigPrefix+"/transaction.lock")
defer func(txnLk RWLocker) {
txnLk.Unlock()
if err != nil {
var cerr config.Err
// For any config error, we don't need to drop into safe-mode
// instead its a user error and should be fixed by user.
if errors.As(err, &cerr) {
return
}
// Prints the formatted startup message in safe mode operation.
// Drops-into safe mode where users need to now manually recover
// the server.
printStartupSafeModeMessage(getAPIEndpoints(), err)
// Initialization returned error reaching safe mode and
// not proceeding waiting for admin action.
handleSignals()
}
}(txnLk)
// **** WARNING ****
// Migrating to encrypted backend should happen before initialization of any
// sub-systems, make sure that we do not move the above codeblock elsewhere.
// Initializing sub-systems 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, migration is needed etc.
rquorum := InsufficientReadQuorum{}
wquorum := InsufficientWriteQuorum{}
for range retry.NewTimer(retryCtx) {
// let one of the server acquire the lock, if not let them timeout.
// which shall be retried again by this loop.
if err = txnLk.GetLock(newDynamicTimeout(1*time.Second, 10*time.Second)); err != nil {
logger.Info("Waiting for all MinIO sub-systems to be initialized.. trying to acquire lock")
continue
}
// These messages only meant primarily for distributed setup, so only log during distributed setup.
if globalIsDistXL {
logger.Info("Waiting for all MinIO sub-systems to be initialized.. lock acquired")
}
// Migrate all backend configs to encrypted backend configs, optionally
// handles rotating keys for encryption, if there is any retriable failure
// that shall be retried if there is an error.
if err = handleEncryptedConfigBackend(newObject, true); err == nil {
// Upon success migrating the config, initialize all sub-systems
// if all sub-systems initialized successfully return right away
if err = initAllSubsystems(retryCtx, newObject); err == nil {
// All successful return.
if globalIsDistXL {
// These messages only meant primarily for distributed setup, so only log during distributed setup.
logger.Info("All MinIO sub-systems initialized successfully")
}
return nil
}
}
// One of these retriable errors shall be retried.
if errors.Is(err, errDiskNotFound) ||
errors.Is(err, errConfigNotFound) ||
errors.Is(err, context.Canceled) ||
errors.Is(err, context.DeadlineExceeded) ||
errors.As(err, &rquorum) ||
errors.As(err, &wquorum) ||
isErrBucketNotFound(err) {
logger.Info("Waiting for all MinIO sub-systems to be initialized.. possible cause (%v)", err)
txnLk.Unlock() // Unlock the transaction lock and allow other nodes to acquire the lock if possible.
continue
}
// Any other unhandled return right here.
return fmt.Errorf("Unable to initialize sub-systems: %w", err)
}
// Return an error when retry is canceled or deadlined
if err = retryCtx.Err(); err != nil {
return fmt.Errorf("Unable to initialize sub-systems: %w", err)
}
// Retry was canceled successfully.
return errors.New("Initializing sub-systems stopped gracefully")
}
func initAllSubsystems(ctx context.Context, newObject ObjectLayer) (err error) {
// %w is used by all error returns here to make sure
// we wrap the underlying error, make sure when you
// are modifying this code that you do so, if and when
// you want to add extra context to your error. This
// ensures top level retry works accordingly.
var buckets []BucketInfo
if globalIsDistXL || globalIsXL {
// List buckets to heal, and be re-used for loading configs.
buckets, err = newObject.ListBucketsHeal(ctx)
if err != nil {
return fmt.Errorf("Unable to list buckets to heal: %w", err)
}
// Attempt a heal if possible and re-use the bucket names
// to reload their config.
wquorum := &InsufficientWriteQuorum{}
rquorum := &InsufficientReadQuorum{}
for _, bucket := range buckets {
if err = newObject.MakeBucketWithLocation(ctx, bucket.Name, "", false); err != nil {
if errors.As(err, &wquorum) || errors.As(err, &rquorum) {
// Return the error upwards for the caller to retry.
return fmt.Errorf("Unable to heal bucket: %w", err)
}
if _, ok := err.(BucketExists); !ok {
// ignore any other error and log for investigation.
logger.LogIf(ctx, err)
continue
}
// Bucket already exists, nothing that needs to be done.
}
}
} else {
buckets, err = newObject.ListBuckets(ctx)
if err != nil {
return fmt.Errorf("Unable to list buckets: %w", err)
}
}
// Initialize config system.
if err = globalConfigSys.Init(newObject); err != nil {
return fmt.Errorf("Unable to initialize config system: %w", err)
}
// Populate existing buckets to the etcd backend
if globalDNSConfig != nil {
// Background this operation.
go initFederatorBackend(buckets, newObject)
}
// Initialize bucket metadata sub-system.
if err := globalBucketMetadataSys.Init(ctx, buckets, newObject); err != nil {
return fmt.Errorf("Unable to initialize bucket metadata sub-system: %w", err)
}
// Initialize notification system.
if err = globalNotificationSys.Init(buckets, newObject); err != nil {
return fmt.Errorf("Unable to initialize notification system: %w", err)
}
return nil
}
func startBackgroundOps(ctx context.Context, objAPI ObjectLayer) {
// Make sure only 1 crawler is running on the cluster.
locker := objAPI.NewNSLock(ctx, minioMetaBucket, "leader")
for {
err := locker.GetLock(leaderLockTimeout)
if err != nil {
time.Sleep(leaderTick)
continue
}
break
// No unlock for "leader" lock.
}
if globalIsXL {
initGlobalHeal(ctx, objAPI)
}
initDataUsageStats(ctx, objAPI)
initDailyLifecycle(ctx, objAPI)
initQuotaEnforcement(ctx, objAPI)
}
// serverMain handler called for 'minio server' command.
func serverMain(ctx *cli.Context) {
if ctx.Args().First() == "help" || !endpointsPresent(ctx) {
cli.ShowCommandHelpAndExit(ctx, "server", 1)
}
setDefaultProfilerRates()
// Initialize globalConsoleSys system
globalConsoleSys = NewConsoleLogger(GlobalContext)
signal.Notify(globalOSSignalCh, os.Interrupt, syscall.SIGTERM)
// Handle all server command args.
serverHandleCmdArgs(ctx)
// Handle all server environment vars.
serverHandleEnvVars()
// Set node name, only set for distributed setup.
globalConsoleSys.SetNodeName(globalEndpoints)
// Initialize all help
initHelp()
// Check and load TLS certificates.
var err error
globalPublicCerts, globalTLSCerts, globalIsSSL, err = getTLSConfig()
logger.FatalIf(err, "Unable to load the TLS configuration")
// Check and load Root CAs.
globalRootCAs, err = config.GetRootCAs(globalCertsCADir.Get())
logger.FatalIf(err, "Failed to read root CAs (%v)", err)
globalMinioEndpoint = func() string {
host := globalMinioHost
if host == "" {
host = sortIPs(localIP4.ToSlice())[0]
}
return fmt.Sprintf("%s://%s", getURLScheme(globalIsSSL), net.JoinHostPort(host, globalMinioPort))
}()
// Is distributed setup, error out if no certificates are found for HTTPS endpoints.
if globalIsDistXL {
if globalEndpoints.HTTPS() && !globalIsSSL {
logger.Fatal(config.ErrNoCertsAndHTTPSEndpoints(nil), "Unable to start the server")
}
if !globalEndpoints.HTTPS() && globalIsSSL {
logger.Fatal(config.ErrCertsAndHTTPEndpoints(nil), "Unable to start the server")
}
}
if !globalCLIContext.Quiet {
// Check for new updates from dl.min.io.
checkUpdate(getMinioMode())
}
if !globalActiveCred.IsValid() && globalIsDistXL {
logger.Fatal(config.ErrEnvCredentialsMissingDistributed(nil),
"Unable to initialize the server in distributed mode")
}
// Set system resources to maximum.
setMaxResources()
if globalIsXL {
// Init global heal state
globalAllHealState = initHealState()
globalBackgroundHealState = initHealState()
}
// Configure server.
handler, err := configureServerHandler(globalEndpoints)
if err != nil {
logger.Fatal(config.ErrUnexpectedError(err), "Unable to configure one of server's RPC services")
}
var getCert certs.GetCertificateFunc
if globalTLSCerts != nil {
getCert = globalTLSCerts.GetCertificate
}
// Annonying hack to ensure that Go doesn't write its own logging,
// interleaved with our formatted logging, this allows us to
// honor --json and --quiet flag properly.
//
// Unfortunately we have to resort to this sort of hacky approach
// because, Go automatically initializes ErrorLog on its own
// and can log without application control.
//
// This is an implementation issue in Go and should be fixed, but
// until then this hack is okay and works for our needs.
pr, pw := io.Pipe()
go func() {
defer pr.Close()
scanner := bufio.NewScanner(&contextReader{pr, GlobalContext})
for scanner.Scan() {
logger.LogIf(GlobalContext, errors.New(scanner.Text()))
}
}()
httpServer := xhttp.NewServer([]string{globalMinioAddr}, criticalErrorHandler{handler}, getCert)
httpServer.ErrorLog = log.New(pw, "", 0)
httpServer.BaseContext = func(listener net.Listener) context.Context {
return GlobalContext
}
go func() {
globalHTTPServerErrorCh <- httpServer.Start()
}()
globalObjLayerMutex.Lock()
globalHTTPServer = httpServer
globalObjLayerMutex.Unlock()
if globalIsDistXL && globalEndpoints.FirstLocal() {
for {
// Additionally in distributed setup, validate the setup and configuration.
err := verifyServerSystemConfig(globalEndpoints)
if err == nil {
break
}
logger.LogIf(GlobalContext, err, "Unable to initialize distributed setup")
select {
case <-GlobalContext.Done():
return
case <-time.After(5 * time.Second):
}
}
}
newObject, err := newObjectLayer(GlobalContext, globalEndpoints)
logger.SetDeploymentID(globalDeploymentID)
if err != nil {
// Stop watching for any certificate changes.
globalTLSCerts.Stop()
globalHTTPServer.Shutdown()
logger.Fatal(err, "Unable to initialize backend")
}
// Once endpoints are finalized, initialize the new object api in safe mode.
globalObjLayerMutex.Lock()
globalSafeMode = true
globalObjectAPI = newObject
globalObjLayerMutex.Unlock()
newAllSubsystems()
// Enable healing to heal drives if possible
if globalIsXL {
initBackgroundHealing(GlobalContext, newObject)
initLocalDisksAutoHeal(GlobalContext, newObject)
}
go startBackgroundOps(GlobalContext, newObject)
logger.FatalIf(initSafeMode(GlobalContext, newObject), "Unable to initialize server switching into safe-mode")
// Initialize users credentials and policies in background.
go startBackgroundIAMLoad(GlobalContext)
if globalCacheConfig.Enabled {
// initialize the new disk cache objects.
var cacheAPI CacheObjectLayer
cacheAPI, err = newServerCacheObjects(GlobalContext, globalCacheConfig)
logger.FatalIf(err, "Unable to initialize disk caching")
globalObjLayerMutex.Lock()
globalCacheObjectAPI = cacheAPI
globalObjLayerMutex.Unlock()
}
// Disable safe mode operation, after all initialization is over.
globalObjLayerMutex.Lock()
globalSafeMode = false
globalObjLayerMutex.Unlock()
// Prints the formatted startup message once object layer is initialized.
printStartupMessage(getAPIEndpoints())
if globalActiveCred.Equal(auth.DefaultCredentials) {
msg := fmt.Sprintf("Detected default credentials '%s', please change the credentials immediately using 'MINIO_ACCESS_KEY' and 'MINIO_SECRET_KEY'", globalActiveCred)
logger.StartupMessage(color.RedBold(msg))
}
handleSignals()
}
// Initialize object layer with the supplied disks, objectLayer is nil upon any error.
func newObjectLayer(ctx context.Context, endpointZones EndpointZones) (newObject ObjectLayer, err error) {
// For FS only, directly use the disk.
if endpointZones.NEndpoints() == 1 {
// Initialize new FS object layer.
return NewFSObjectLayer(endpointZones[0].Endpoints[0].Path)
}
return newXLZones(ctx, endpointZones)
}