minio/cmd/prepare-storage.go

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/*
* MinIO Cloud Storage, (C) 2016 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 (
"crypto/tls"
"fmt"
"net/http"
"net/url"
"os"
"path"
"sync"
"time"
"github.com/dustin/go-humanize"
"github.com/minio/minio/cmd/config"
xhttp "github.com/minio/minio/cmd/http"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/sync/errgroup"
)
var printEndpointError = func() func(Endpoint, error) {
var mutex sync.Mutex
printOnce := make(map[Endpoint]map[string]bool)
return func(endpoint Endpoint, err error) {
reqInfo := (&logger.ReqInfo{}).AppendTags("endpoint", endpoint.String())
ctx := logger.SetReqInfo(GlobalContext, reqInfo)
mutex.Lock()
defer mutex.Unlock()
m, ok := printOnce[endpoint]
if !ok {
m = make(map[string]bool)
m[err.Error()] = true
printOnce[endpoint] = m
logger.LogAlwaysIf(ctx, err)
return
}
if m[err.Error()] {
return
}
m[err.Error()] = true
logger.LogAlwaysIf(ctx, err)
}
}()
// Migrates backend format of local disks.
func formatErasureMigrateLocalEndpoints(endpoints Endpoints) error {
g := errgroup.WithNErrs(len(endpoints))
for index, endpoint := range endpoints {
if !endpoint.IsLocal {
continue
}
index := index
g.Go(func() error {
epPath := endpoints[index].Path
formatPath := pathJoin(epPath, minioMetaBucket, formatConfigFile)
if _, err := os.Stat(formatPath); err != nil {
if os.IsNotExist(err) {
return nil
}
return fmt.Errorf("unable to access (%s) %w", formatPath, err)
}
return formatErasureMigrate(epPath)
}, index)
}
for _, err := range g.Wait() {
if err != nil {
return err
}
}
return nil
}
// Cleans up tmp directory of local disks.
func formatErasureCleanupTmpLocalEndpoints(endpoints Endpoints) error {
g := errgroup.WithNErrs(len(endpoints))
for index, endpoint := range endpoints {
if !endpoint.IsLocal {
continue
}
index := index
g.Go(func() error {
epPath := endpoints[index].Path
// If disk is not formatted there is nothing to be cleaned up.
formatPath := pathJoin(epPath, minioMetaBucket, formatConfigFile)
if _, err := os.Stat(formatPath); err != nil {
if os.IsNotExist(err) {
return nil
}
return fmt.Errorf("unable to access (%s) %w", formatPath, err)
}
if _, err := os.Stat(pathJoin(epPath, minioMetaTmpBucket+"-old")); err != nil {
if !os.IsNotExist(err) {
return fmt.Errorf("unable to access (%s) %w",
pathJoin(epPath, minioMetaTmpBucket+"-old"),
err)
}
}
// Need to move temporary objects left behind from previous run of minio
// server to a unique directory under `minioMetaTmpBucket-old` to clean
// up `minioMetaTmpBucket` for the current run.
//
// /disk1/.minio.sys/tmp-old/
// |__ 33a58b40-aecc-4c9f-a22f-ff17bfa33b62
// |__ e870a2c1-d09c-450c-a69c-6eaa54a89b3e
//
// In this example, `33a58b40-aecc-4c9f-a22f-ff17bfa33b62` directory contains
// temporary objects from one of the previous runs of minio server.
tmpOld := pathJoin(epPath, minioMetaTmpBucket+"-old", mustGetUUID())
if err := renameAll(pathJoin(epPath, minioMetaTmpBucket),
tmpOld); err != nil && err != errFileNotFound {
return fmt.Errorf("unable to rename (%s -> %s) %w",
pathJoin(epPath, minioMetaTmpBucket),
tmpOld,
err)
}
// Removal of tmp-old folder is backgrounded completely.
go removeAll(pathJoin(epPath, minioMetaTmpBucket+"-old"))
if err := mkdirAll(pathJoin(epPath, minioMetaTmpBucket), 0777); err != nil {
return fmt.Errorf("unable to create (%s) %w",
pathJoin(epPath, minioMetaTmpBucket),
err)
}
return nil
}, index)
}
for _, err := range g.Wait() {
if err != nil {
return err
}
}
return nil
}
// Following error message is added to fix a regression in release
// RELEASE.2018-03-16T22-52-12Z after migrating v1 to v2 to v3. This
// migration failed to capture '.This' field properly which indicates
// the disk UUID association. Below error message is returned when
// we see this situation in format.json, for more info refer
// https://github.com/minio/minio/issues/5667
var errErasureV3ThisEmpty = fmt.Errorf("Erasure format version 3 has This field empty")
// IsServerResolvable - checks if the endpoint is resolvable
// by sending a naked HTTP request with liveness checks.
func IsServerResolvable(endpoint Endpoint) error {
serverURL := &url.URL{
Scheme: endpoint.Scheme,
Host: endpoint.Host,
Path: path.Join(healthCheckPathPrefix, healthCheckLivenessPath),
}
var tlsConfig *tls.Config
if globalIsSSL {
tlsConfig = &tls.Config{
ServerName: endpoint.Hostname(),
RootCAs: globalRootCAs,
NextProtos: []string{"http/1.1"}, // Force http1.1
}
}
req, err := http.NewRequest(http.MethodGet, serverURL.String(), nil)
if err != nil {
return err
}
httpClient := &http.Client{
Transport:
// For more details about various values used here refer
// https://golang.org/pkg/net/http/#Transport documentation
&http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: xhttp.NewCustomDialContext(3 * time.Second),
ResponseHeaderTimeout: 5 * time.Second,
TLSHandshakeTimeout: 5 * time.Second,
ExpectContinueTimeout: 5 * time.Second,
TLSClientConfig: tlsConfig,
// Go net/http automatically unzip if content-type is
// gzip disable this feature, as we are always interested
// in raw stream.
DisableCompression: true,
},
}
defer httpClient.CloseIdleConnections()
resp, err := httpClient.Do(req)
if err != nil {
return err
}
defer xhttp.DrainBody(resp.Body)
if resp.StatusCode != http.StatusOK {
return StorageErr(resp.Status)
}
return nil
}
// connect to list of endpoints and load all Erasure disk formats, validate the formats are correct
// and are in quorum, if no formats are found attempt to initialize all of them for the first
// time. additionally make sure to close all the disks used in this attempt.
func connectLoadInitFormats(retryCount int, firstDisk bool, endpoints Endpoints, zoneCount, setCount, drivesPerSet int, deploymentID string) (storageDisks []StorageAPI, format *formatErasureV3, err error) {
// Initialize all storage disks
storageDisks, errs := initStorageDisksWithErrors(endpoints)
defer func(storageDisks []StorageAPI) {
if err != nil {
closeStorageDisks(storageDisks)
}
}(storageDisks)
for i, err := range errs {
if err != nil {
if err != errDiskNotFound {
return nil, nil, fmt.Errorf("Disk %s: %w", endpoints[i], err)
}
if retryCount >= 5 {
logger.Info("Unable to connect to %s: %v\n", endpoints[i], IsServerResolvable(endpoints[i]))
}
}
}
// Attempt to load all `format.json` from all disks.
formatConfigs, sErrs := loadFormatErasureAll(storageDisks, false)
// Check if we have
for i, sErr := range sErrs {
if _, ok := formatCriticalErrors[sErr]; ok {
return nil, nil, config.ErrCorruptedBackend(err).Hint(fmt.Sprintf("Clear any pre-existing content on %s", endpoints[i]))
}
// not critical error but still print the error, nonetheless, which is perhaps unhandled
if sErr != errUnformattedDisk && sErr != errDiskNotFound && retryCount >= 5 {
if sErr != nil {
logger.Info("Unable to read 'format.json' from %s: %v\n", endpoints[i], sErr)
}
}
}
// Pre-emptively check if one of the formatted disks
// is invalid. This function returns success for the
// most part unless one of the formats is not consistent
// with expected Erasure format. For example if a user is
// trying to pool FS backend into an Erasure set.
if err = checkFormatErasureValues(formatConfigs, drivesPerSet); err != nil {
return nil, nil, err
}
// All disks report unformatted we should initialized everyone.
if shouldInitErasureDisks(sErrs) && firstDisk {
logger.Info("Formatting %s zone, %v set(s), %v drives per set.",
humanize.Ordinal(zoneCount), setCount, drivesPerSet)
// Initialize erasure code format on disks
format, err = initFormatErasure(GlobalContext, storageDisks, setCount, drivesPerSet, deploymentID)
if err != nil {
return nil, nil, err
}
// Assign globalDeploymentID on first run for the
// minio server managing the first disk
globalDeploymentID = format.ID
return storageDisks, format, nil
}
// Return error when quorum unformatted disks - indicating we are
// waiting for first server to be online.
if quorumUnformattedDisks(sErrs) && !firstDisk {
return nil, nil, errNotFirstDisk
}
// Return error when quorum unformatted disks but waiting for rest
// of the servers to be online.
if quorumUnformattedDisks(sErrs) && firstDisk {
return nil, nil, errFirstDiskWait
}
// Following function is added to fix a regressions which was introduced
// in release RELEASE.2018-03-16T22-52-12Z after migrating v1 to v2 to v3.
// This migration failed to capture '.This' field properly which indicates
// the disk UUID association. Below function is called to handle and fix
// this regression, for more info refer https://github.com/minio/minio/issues/5667
if err = fixFormatErasureV3(storageDisks, endpoints, formatConfigs); err != nil {
return nil, nil, err
}
// If any of the .This field is still empty, we return error.
if formatErasureV3ThisEmpty(formatConfigs) {
return nil, nil, errErasureV3ThisEmpty
}
format, err = getFormatErasureInQuorum(formatConfigs)
if err != nil {
return nil, nil, err
}
if format.ID == "" {
// Not a first disk, wait until first disk fixes deploymentID
if !firstDisk {
return nil, nil, errNotFirstDisk
}
if err = formatErasureFixDeploymentID(endpoints, storageDisks, format); err != nil {
return nil, nil, err
}
}
globalDeploymentID = format.ID
if err = formatErasureFixLocalDeploymentID(endpoints, storageDisks, format); err != nil {
return nil, nil, err
}
// The will always recreate some directories inside .minio.sys of
// the local disk such as tmp, multipart and background-ops
initErasureMetaVolumesInLocalDisks(storageDisks, formatConfigs)
return storageDisks, format, nil
}
// Format disks before initialization of object layer.
func waitForFormatErasure(firstDisk bool, endpoints Endpoints, zoneCount, setCount, drivesPerSet int, deploymentID string) ([]StorageAPI, *formatErasureV3, error) {
if len(endpoints) == 0 || setCount == 0 || drivesPerSet == 0 {
return nil, nil, errInvalidArgument
}
if err := formatErasureMigrateLocalEndpoints(endpoints); err != nil {
return nil, nil, err
}
if err := formatErasureCleanupTmpLocalEndpoints(endpoints); err != nil {
return nil, nil, err
}
// prepare getElapsedTime() to calculate elapsed time since we started trying formatting disks.
// All times are rounded to avoid showing milli, micro and nano seconds
formatStartTime := time.Now().Round(time.Second)
getElapsedTime := func() string {
return time.Now().Round(time.Second).Sub(formatStartTime).String()
}
// Wait on each try for an update.
ticker := time.NewTicker(500 * time.Millisecond)
defer ticker.Stop()
var tries int
for {
select {
case <-ticker.C:
storageDisks, format, err := connectLoadInitFormats(tries, firstDisk, endpoints, zoneCount, setCount, drivesPerSet, deploymentID)
if err != nil {
tries++
switch err {
case errNotFirstDisk:
// Fresh setup, wait for first server to be up.
logger.Info("Waiting for the first server to format the disks.")
continue
case errFirstDiskWait:
// Fresh setup, wait for other servers to come up.
logger.Info("Waiting for all other servers to be online to format the disks.")
continue
case errErasureReadQuorum:
// no quorum available continue to wait for minimum number of servers.
logger.Info("Waiting for a minimum of %d disks to come online (elapsed %s)\n", len(endpoints)/2, getElapsedTime())
continue
case errErasureV3ThisEmpty:
// need to wait for this error to be healed, so continue.
continue
default:
// For all other unhandled errors we exit and fail.
return nil, nil, err
}
}
return storageDisks, format, nil
case <-globalOSSignalCh:
return nil, nil, fmt.Errorf("Initializing data volumes gracefully stopped")
}
}
}