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minio/cmd/server-main.go

531 lines
16 KiB

/*
* Minio Cloud Storage, (C) 2015, 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 (
"errors"
"fmt"
"net"
"net/url"
"os"
"path"
"sort"
"strconv"
"strings"
"runtime"
"github.com/minio/cli"
)
var serverFlags = []cli.Flag{
cli.StringFlag{
Name: "address",
Value: ":9000",
Usage: `Bind to a specific IP:PORT. Defaults to ":9000".`,
},
}
var serverCmd = cli.Command{
Name: "server",
Usage: "Start object storage server.",
Flags: append(serverFlags, globalFlags...),
Action: serverMain,
CustomHelpTemplate: `NAME:
minio {{.Name}} - {{.Usage}}
USAGE:
minio {{.Name}} [FLAGS] PATH [PATH...]
FLAGS:
{{range .Flags}}{{.}}
{{end}}
ENVIRONMENT VARIABLES:
ACCESS:
MINIO_ACCESS_KEY: Custom username or access key of 5 to 20 characters in length.
MINIO_SECRET_KEY: Custom password or secret key of 8 to 40 characters in length.
BROWSER:
MINIO_BROWSER: To disable web browser access, set this value to "off".
EXAMPLES:
1. Start minio server on "/home/shared" directory.
$ minio {{.Name}} /home/shared
2. Start minio server bound to a specific IP:PORT.
$ minio {{.Name}} --address 192.168.1.101:9000 /home/shared
3. Start erasure coded minio server on a 12 disks server.
$ minio {{.Name}} /mnt/export1/ /mnt/export2/ /mnt/export3/ /mnt/export4/ \
/mnt/export5/ /mnt/export6/ /mnt/export7/ /mnt/export8/ /mnt/export9/ \
/mnt/export10/ /mnt/export11/ /mnt/export12/
4. Start erasure coded distributed minio server on a 4 node setup with 1 drive each. Run following commands on all the 4 nodes.
$ export MINIO_ACCESS_KEY=minio
$ export MINIO_SECRET_KEY=miniostorage
$ minio {{.Name}} http://192.168.1.11/mnt/export/ http://192.168.1.12/mnt/export/ \
http://192.168.1.13/mnt/export/ http://192.168.1.14/mnt/export/
`,
}
type serverCmdConfig struct {
serverAddr string
endpoints []*url.URL
}
// Parse an array of end-points (from the command line)
func parseStorageEndpoints(eps []string) (endpoints []*url.URL, err error) {
for _, ep := range eps {
if ep == "" {
return nil, errInvalidArgument
}
var u *url.URL
u, err = url.Parse(ep)
if err != nil {
return nil, err
}
if u.Host != "" {
_, port, err := net.SplitHostPort(u.Host)
// Ignore the missing port error as the default port can be globalMinioPort.
if err != nil && !strings.Contains(err.Error(), "missing port in address") {
return nil, err
}
if globalMinioHost == "" {
// For ex.: minio server host1:port1 host2:port2...
// we return error as port is configurable only
// using "--address :port"
if port != "" {
return nil, fmt.Errorf("Invalid Argument %s, port configurable using --address :<port>", u.Host)
}
u.Host = net.JoinHostPort(u.Host, globalMinioPort)
} else {
// For ex.: minio server --address host:port host1:port1 host2:port2...
// i.e if "--address host:port" is specified
// port info in u.Host is mandatory else return error.
if port == "" {
return nil, fmt.Errorf("Invalid Argument %s, port mandatory when --address <host>:<port> is used", u.Host)
}
}
}
endpoints = append(endpoints, u)
}
return endpoints, nil
}
// initServerConfig initialize server config.
func initServerConfig(c *cli.Context) {
// Create certs path.
err := createCertsPath()
fatalIf(err, "Unable to create \"certs\" directory.")
// Load user supplied root CAs
loadRootCAs()
// When credentials inherited from the env, server cmd has to save them in the disk
if os.Getenv("MINIO_ACCESS_KEY") != "" && os.Getenv("MINIO_SECRET_KEY") != "" {
// Env credentials are already loaded in serverConfig, just save in the disk
err = serverConfig.Save()
fatalIf(err, "Unable to save credentials in the disk.")
}
// Set maxOpenFiles, This is necessary since default operating
// system limits of 1024, 2048 are not enough for Minio server.
setMaxOpenFiles()
// Set maxMemory, This is necessary since default operating
// system limits might be changed and we need to make sure we
// do not crash the server so the set the maxCacheSize appropriately.
setMaxMemory()
// Do not fail if this is not allowed, lower limits are fine as well.
}
// Validate if input disks are sufficient for initializing XL.
func checkSufficientDisks(eps []*url.URL) error {
// Verify total number of disks.
total := len(eps)
if total > maxErasureBlocks {
return errXLMaxDisks
}
if total < minErasureBlocks {
return errXLMinDisks
}
// isEven function to verify if a given number if even.
isEven := func(number int) bool {
return number%2 == 0
}
// Verify if we have even number of disks.
// only combination of 4, 6, 8, 10, 12, 14, 16 are supported.
if !isEven(total) {
return errXLNumDisks
}
// Success.
return nil
}
// Returns if slice of disks is a distributed setup.
func isDistributedSetup(eps []*url.URL) bool {
// Validate if one the disks is not local.
for _, ep := range eps {
if !isLocalStorage(ep) {
// One or more disks supplied as arguments are
// not attached to the local node.
return true
}
}
return false
}
// Returns true if path is empty, or equals to '.', '/', '\' characters.
func isPathSentinel(path string) bool {
return path == "" || path == "." || path == "/" || path == `\`
}
// Returned when path is empty or root path.
var errEmptyRootPath = errors.New("Empty or root path is not allowed")
// Invalid scheme passed.
var errInvalidScheme = errors.New("Invalid scheme")
// Check if endpoint is in expected syntax by valid scheme/path across all platforms.
func checkEndpointURL(endpointURL *url.URL) (err error) {
// Applicable to all OS.
if endpointURL.Scheme == "" || endpointURL.Scheme == httpScheme || endpointURL.Scheme == httpsScheme {
if isPathSentinel(path.Clean(endpointURL.Path)) {
err = errEmptyRootPath
}
return err
}
// Applicable to Windows only.
if runtime.GOOS == globalWindowsOSName {
// On Windows, endpoint can be a path with drive eg. C:\Export and its URL.Scheme is 'C'.
// Check if URL.Scheme is a single letter alphabet to represent a drive.
// Note: URL.Parse() converts scheme into lower case always.
if len(endpointURL.Scheme) == 1 && endpointURL.Scheme[0] >= 'a' && endpointURL.Scheme[0] <= 'z' {
// If endpoint is C:\ or C:\export, URL.Path does not have path information like \ or \export
// hence we directly work with endpoint.
if isPathSentinel(strings.SplitN(path.Clean(endpointURL.String()), ":", 2)[1]) {
err = errEmptyRootPath
}
return err
}
}
return errInvalidScheme
}
// Check if endpoints are in expected syntax by valid scheme/path across all platforms.
func checkEndpointsSyntax(eps []*url.URL, disks []string) error {
for i, u := range eps {
if err := checkEndpointURL(u); err != nil {
return fmt.Errorf("%s: %s (%s)", err.Error(), u.Path, disks[i])
}
}
return nil
}
// Make sure all the command line parameters are OK and exit in case of invalid parameters.
func checkServerSyntax(c *cli.Context) {
serverAddr := c.String("address")
host, portStr, err := net.SplitHostPort(serverAddr)
fatalIf(err, "Unable to parse %s.", serverAddr)
// Verify syntax for all the XL disks.
disks := c.Args()
// Parse disks check if they comply with expected URI style.
endpoints, err := parseStorageEndpoints(disks)
fatalIf(err, "Unable to parse storage endpoints %s", strings.Join(disks, " "))
// Validate if endpoints follow the expected syntax.
err = checkEndpointsSyntax(endpoints, disks)
fatalIf(err, "Invalid endpoints found %s", strings.Join(disks, " "))
// Validate for duplicate endpoints are supplied.
err = checkDuplicateEndpoints(endpoints)
fatalIf(err, "Duplicate entries in %s", strings.Join(disks, " "))
if len(endpoints) > 1 {
// Validate if we have sufficient disks for XL setup.
err = checkSufficientDisks(endpoints)
fatalIf(err, "Insufficient number of disks.")
} else {
// Validate if we have invalid disk for FS setup.
if endpoints[0].Host != "" && endpoints[0].Scheme != "" {
fatalIf(errInvalidArgument, "%s, FS setup expects a filesystem path", endpoints[0])
}
}
if !isDistributedSetup(endpoints) {
// for FS and singlenode-XL validation is done, return.
return
}
// Rest of the checks applies only to distributed XL setup.
if host != "" {
// We are here implies --address host:port is passed, hence the user is trying
// to run one minio process per export disk.
if portStr == "" {
fatalIf(errInvalidArgument, "Port missing, Host:Port should be specified for --address")
}
foundCnt := 0
for _, ep := range endpoints {
if ep.Host == serverAddr {
foundCnt++
}
}
if foundCnt == 0 {
// --address host:port should be available in the XL disk list.
fatalIf(errInvalidArgument, "%s is not available in %s", serverAddr, strings.Join(disks, " "))
}
if foundCnt > 1 {
// --address host:port should match exactly one entry in the XL disk list.
fatalIf(errInvalidArgument, "%s matches % entries in %s", serverAddr, foundCnt, strings.Join(disks, " "))
}
}
for _, ep := range endpoints {
if ep.Scheme == httpsScheme && !globalIsSSL {
// Certificates should be provided for https configuration.
fatalIf(errInvalidArgument, "Certificates not provided for secure configuration")
}
}
}
// Checks if any of the endpoints supplied is local to this server.
func isAnyEndpointLocal(eps []*url.URL) bool {
anyLocalEp := false
for _, ep := range eps {
if isLocalStorage(ep) {
anyLocalEp = true
break
}
}
return anyLocalEp
}
// Returned when there are no ports.
var errEmptyPort = errors.New("Port cannot be empty or '0', please use `--address` to pick a specific port")
// Convert an input address of form host:port into, host and port, returns if any.
func getHostPort(address string) (host, port string, err error) {
// Check if requested port is available.
host, port, err = net.SplitHostPort(address)
if err != nil {
return "", "", err
}
// Empty ports.
if port == "0" || port == "" {
// Port zero or empty means use requested to choose any freely available
// port. Avoid this since it won't work with any configured clients,
// can lead to serious loss of availability.
return "", "", errEmptyPort
}
// Parse port.
if _, err = strconv.Atoi(port); err != nil {
return "", "", err
}
// Check if port is available.
if err = checkPortAvailability(port); err != nil {
return "", "", err
}
// Success.
return host, port, nil
}
// serverMain handler called for 'minio server' command.
func serverMain(c *cli.Context) {
if !c.Args().Present() || c.Args().First() == "help" {
cli.ShowCommandHelpAndExit(c, "server", 1)
}
// Initialization routine, such as config loading, enable logging, ..
minioInit(c)
// Check for new updates from dl.minio.io.
checkUpdate()
// Server address.
serverAddr := c.String("address")
var err error
globalMinioHost, globalMinioPort, err = getHostPort(serverAddr)
fatalIf(err, "Unable to extract host and port %s", serverAddr)
// Check server syntax and exit in case of errors.
// Done after globalMinioHost and globalMinioPort is set
// as parseStorageEndpoints() depends on it.
checkServerSyntax(c)
// Initialize server config.
initServerConfig(c)
// Disks to be used in server init.
endpoints, err := parseStorageEndpoints(c.Args())
fatalIf(err, "Unable to parse storage endpoints %s", c.Args())
// Should exit gracefully if none of the endpoints passed
// as command line args are local to this server.
if !isAnyEndpointLocal(endpoints) {
fatalIf(errInvalidArgument, "None of the disks passed as command line args are local to this server.")
}
// Sort endpoints for consistent ordering across multiple
// nodes in a distributed setup. This is to avoid format.json
// corruption if the disks aren't supplied in the same order
// on all nodes.
sort.Sort(byHostPath(endpoints))
// Configure server.
srvConfig := serverCmdConfig{
serverAddr: serverAddr,
endpoints: endpoints,
}
// Check if endpoints are part of distributed setup.
globalIsDistXL = isDistributedSetup(endpoints)
// Set nodes for dsync for distributed setup.
if globalIsDistXL {
fatalIf(initDsyncNodes(endpoints), "Unable to initialize distributed locking clients")
}
// Set globalIsXL if erasure code backend is about to be
// initialized for the given endpoints.
if len(endpoints) > 1 {
globalIsXL = true
}
// Initialize name space lock.
initNSLock(globalIsDistXL)
// Configure server.
handler, err := configureServerHandler(srvConfig)
fatalIf(err, "Unable to configure one of server's RPC services.")
// Initialize a new HTTP server.
apiServer := NewServerMux(serverAddr, handler)
// Set the global minio addr for this server.
globalMinioAddr = getLocalAddress(srvConfig)
// Initialize S3 Peers inter-node communication only in distributed setup.
initGlobalS3Peers(endpoints)
// Initialize Admin Peers inter-node communication only in distributed setup.
initGlobalAdminPeers(endpoints)
// Determine API endpoints where we are going to serve the S3 API from.
apiEndPoints, err := finalizeAPIEndpoints(apiServer.Server)
fatalIf(err, "Unable to finalize API endpoints for %s", apiServer.Server.Addr)
// Set the global API endpoints value.
globalAPIEndpoints = apiEndPoints
// Start server, automatically configures TLS if certs are available.
go func() {
cert, key := "", ""
if globalIsSSL {
cert, key = mustGetCertFile(), mustGetKeyFile()
}
fatalIf(apiServer.ListenAndServe(cert, key), "Failed to start minio server.")
}()
// Set endpoints of []*url.URL type to globalEndpoints.
globalEndpoints = endpoints
newObject, err := newObjectLayer(srvConfig)
fatalIf(err, "Initializing object layer failed")
globalObjLayerMutex.Lock()
globalObjectAPI = newObject
globalObjLayerMutex.Unlock()
// Prints the formatted startup message once object layer is initialized.
printStartupMessage(apiEndPoints)
// Waits on the server.
<-globalServiceDoneCh
}
// Initialize object layer with the supplied disks, objectLayer is nil upon any error.
func newObjectLayer(srvCmdCfg serverCmdConfig) (newObject ObjectLayer, err error) {
// For FS only, directly use the disk.
isFS := len(srvCmdCfg.endpoints) == 1
if isFS {
// Unescape is needed for some UNC paths on windows
// which are of this form \\127.0.0.1\\export\test.
var fsPath string
fsPath, err = url.QueryUnescape(srvCmdCfg.endpoints[0].String())
if err != nil {
return nil, err
}
// Initialize new FS object layer.
newObject, err = newFSObjectLayer(fsPath)
if err != nil {
return nil, err
}
// FS initialized, return.
return newObject, nil
}
// First disk argument check if it is local.
firstDisk := isLocalStorage(srvCmdCfg.endpoints[0])
// Initialize storage disks.
storageDisks, err := initStorageDisks(srvCmdCfg.endpoints)
if err != nil {
return nil, err
}
// Wait for formatting disks for XL backend.
var formattedDisks []StorageAPI
formattedDisks, err = waitForFormatXLDisks(firstDisk, srvCmdCfg.endpoints, storageDisks)
if err != nil {
return nil, err
}
// Cleanup objects that weren't successfully written into the namespace.
if err = houseKeeping(storageDisks); err != nil {
return nil, err
}
// Once XL formatted, initialize object layer.
newObject, err = newXLObjectLayer(formattedDisks)
if err != nil {
return nil, err
}
// XL initialized, return.
return newObject, nil
}