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start.go
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start.go
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// Copyright 2015 The Cockroach Authors.
//
// 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.
//
// Author: Andrew Bonventre (andybons@gmail.com)
// Author: Spencer Kimball (spencer.kimball@gmail.com)
package cli
import (
"bytes"
"flag"
"fmt"
"io"
"io/ioutil"
"net"
"net/url"
"os"
"os/signal"
"path/filepath"
"runtime"
"runtime/pprof"
"strings"
"syscall"
"text/tabwriter"
"time"
opentracing "github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"golang.org/x/net/context"
"google.golang.org/grpc"
"github.com/cockroachdb/cockroach/pkg/build"
"github.com/cockroachdb/cockroach/pkg/rpc"
"github.com/cockroachdb/cockroach/pkg/security"
"github.com/cockroachdb/cockroach/pkg/server"
"github.com/cockroachdb/cockroach/pkg/server/serverpb"
"github.com/cockroachdb/cockroach/pkg/util/envutil"
"github.com/cockroachdb/cockroach/pkg/util/grpcutil"
"github.com/cockroachdb/cockroach/pkg/util/hlc"
"github.com/cockroachdb/cockroach/pkg/util/log"
"github.com/cockroachdb/cockroach/pkg/util/log/logflags"
"github.com/cockroachdb/cockroach/pkg/util/stop"
"github.com/cockroachdb/cockroach/pkg/util/syncutil"
"github.com/cockroachdb/cockroach/pkg/util/timeutil"
"github.com/cockroachdb/cockroach/pkg/util/tracing"
)
// jemallocHeapDump is an optional function to be called at heap dump time.
// This will be non-nil when jemalloc is linked in with profiling enabled.
// The function takes a filename to write the profile to.
var jemallocHeapDump func(string) error
// startCmd starts a node by initializing the stores and joining
// the cluster.
var startCmd = &cobra.Command{
Use: "start",
Short: "start a node",
Long: `
Start a CockroachDB node, which will export data from one or more
storage devices, specified via --store flags.
If no cluster exists yet and this is the first node, no additional
flags are required. If the cluster already exists, and this node is
uninitialized, specify the --join flag to point to any healthy node
(or list of nodes) already part of the cluster.
`,
Example: ` cockroach start --insecure --store=attrs=ssd,path=/mnt/ssd1 [--join=host:port,[host:port]]`,
RunE: MaybeShoutError(MaybeDecorateGRPCError(runStart)),
}
func setDefaultSizeParameters(ctx *server.Config) {
if size, err := server.GetTotalMemory(); err == nil {
// Default the cache size to 1/4 of total memory. A larger cache size
// doesn't necessarily improve performance as this is memory that is
// dedicated to uncompressed blocks in RocksDB. A larger value here will
// compete with the OS buffer cache which holds compressed blocks.
ctx.CacheSize = size / 4
// Default the SQL memory pool size to 1/4 of total memory. Again
// we do not want to allow too much lest this will pressure
// against OS buffers and decrease overall client throughput.
ctx.SQLMemoryPoolSize = size / 4
}
}
// maxSizePerProfile is the maximum total size in bytes for profiles per
// profile type.
var maxSizePerProfile = envutil.EnvOrDefaultInt64(
"COCKROACH_MAX_SIZE_PER_PROFILE", 100<<20 /* 100 MB */)
// gcProfiles removes old profiles matching the specified prefix when the sum
// of newer profiles is larger than maxSize. Requires that the suffix used for
// the profiles indicates age (e.g. by using a date/timestamp suffix) such that
// sorting the filenames corresponds to ordering the profiles from oldest to
// newest.
func gcProfiles(dir, prefix string, maxSize int64) {
files, err := ioutil.ReadDir(dir)
if err != nil {
log.Warning(context.Background(), err)
return
}
var sum int64
var found int
for i := len(files) - 1; i >= 0; i-- {
f := files[i]
if !f.Mode().IsRegular() {
continue
}
if !strings.HasPrefix(f.Name(), prefix) {
continue
}
found++
sum += f.Size()
if found == 1 {
// Always keep the most recent profile.
continue
}
if sum <= maxSize {
continue
}
if err := os.Remove(filepath.Join(dir, f.Name())); err != nil {
log.Info(context.Background(), err)
}
}
}
func initMemProfile(ctx context.Context, dir string) {
const jeprof = "jeprof."
const memprof = "memprof."
gcProfiles(dir, jeprof, maxSizePerProfile)
gcProfiles(dir, memprof, maxSizePerProfile)
memProfileInterval := envutil.EnvOrDefaultDuration("COCKROACH_MEMPROF_INTERVAL", -1)
if memProfileInterval <= 0 {
return
}
if min := time.Second; memProfileInterval < min {
log.Infof(ctx, "fixing excessively short memory profiling interval: %s -> %s",
memProfileInterval, min)
memProfileInterval = min
}
if jemallocHeapDump != nil {
log.Infof(ctx, "writing go and jemalloc memory profiles to %s every %s", dir, memProfileInterval)
} else {
log.Infof(ctx, "writing go only memory profiles to %s every %s", dir, memProfileInterval)
log.Infof(ctx, `to enable jmalloc profiling: "export MALLOC_CONF=prof:true" or "ln -s prof:true /etc/malloc.conf"`)
}
go func() {
ctx := context.Background()
t := time.NewTicker(memProfileInterval)
defer t.Stop()
for {
<-t.C
func() {
const format = "2006-01-02T15_04_05.999"
suffix := timeutil.Now().Format(format)
// Try jemalloc heap profile first, we only log errors.
if jemallocHeapDump != nil {
jepath := filepath.Join(dir, jeprof+suffix)
if err := jemallocHeapDump(jepath); err != nil {
log.Warningf(ctx, "error writing jemalloc heap %s: %s", jepath, err)
}
gcProfiles(dir, jeprof, maxSizePerProfile)
}
path := filepath.Join(dir, memprof+suffix)
// Try writing a go heap profile.
f, err := os.Create(path)
if err != nil {
log.Warningf(ctx, "error creating go heap file %s", err)
return
}
defer f.Close()
if err = pprof.WriteHeapProfile(f); err != nil {
log.Warningf(ctx, "error writing go heap %s: %s", path, err)
return
}
gcProfiles(dir, memprof, maxSizePerProfile)
}()
}
}()
}
func initCPUProfile(ctx context.Context, dir string) {
const cpuprof = "cpuprof."
gcProfiles(dir, cpuprof, maxSizePerProfile)
cpuProfileInterval := envutil.EnvOrDefaultDuration("COCKROACH_CPUPROF_INTERVAL", -1)
if cpuProfileInterval <= 0 {
return
}
if min := time.Second; cpuProfileInterval < min {
log.Infof(ctx, "fixing excessively short cpu profiling interval: %s -> %s",
cpuProfileInterval, min)
cpuProfileInterval = min
}
go func() {
defer log.RecoverAndReportPanic(ctx)
ctx := context.Background()
t := time.NewTicker(cpuProfileInterval)
defer t.Stop()
var currentProfile *os.File
defer func() {
if currentProfile != nil {
pprof.StopCPUProfile()
currentProfile.Close()
}
}()
for {
func() {
const format = "2006-01-02T15_04_05.999"
suffix := timeutil.Now().Add(cpuProfileInterval).Format(format)
f, err := os.Create(filepath.Join(dir, cpuprof+suffix))
if err != nil {
log.Warningf(ctx, "error creating go cpu file %s", err)
return
}
// Stop the current profile if it exists.
if currentProfile != nil {
pprof.StopCPUProfile()
currentProfile.Close()
currentProfile = nil
gcProfiles(dir, cpuprof, maxSizePerProfile)
}
// Start the new profile.
if err := pprof.StartCPUProfile(f); err != nil {
log.Warningf(ctx, "unable to start cpu profile: %v", err)
f.Close()
return
}
currentProfile = f
}()
<-t.C
}
}()
}
func initBlockProfile() {
// Enable the block profile for a sample of mutex and channel operations.
// Smaller values provide more accurate profiles but are more
// expensive. 0 and 1 are special: 0 disables the block profile and
// 1 captures 100% of block events. For other values, the profiler
// will sample one event per X nanoseconds spent blocking.
//
// The block profile can be viewed with `pprof http://HOST:PORT/debug/pprof/block`
d := envutil.EnvOrDefaultInt64("COCKROACH_BLOCK_PROFILE_RATE",
10000000 /* 1 sample per 10 milliseconds spent blocking */)
runtime.SetBlockProfileRate(int(d))
}
// ErrorCode is the value to be used by main() as exit code in case of
// error. For most errors 1 is appropriate, but a signal termination
// can change this.
var ErrorCode = 1
// runStart starts the cockroach node using --store as the list of
// storage devices ("stores") on this machine and --join as the list
// of other active nodes used to join this node to the cockroach
// cluster, if this is its first time connecting.
func runStart(cmd *cobra.Command, args []string) error {
if len(args) > 0 {
return usageAndError(cmd)
}
if ok, err := maybeRerunBackground(); ok {
return err
}
// Use the server-specific values for some flags and settings.
serverCfg.Insecure = serverInsecure
serverCfg.SSLCertsDir = serverSSLCertsDir
serverCfg.User = security.NodeUser
signalCh := make(chan os.Signal, 1)
signal.Notify(signalCh, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
tracer := tracing.NewTracer()
sp := tracer.StartSpan("server start")
startCtx := opentracing.ContextWithSpan(context.Background(), sp)
// Set up the logging and profiling output.
// It is important that no logging occurs before this point or the log files
// will be created in $TMPDIR instead of their expected location.
stopper, err := setupAndInitializeLoggingAndProfiling(startCtx)
if err != nil {
return err
}
// Run the rest of the startup process in the background to avoid preventing
// proper handling of signals if we get stuck on something during
// initialization (#10138).
var serverStatusMu struct {
syncutil.Mutex
// Used to synchronize server startup with server shutdown if something
// interrupts the process during initialization (it isn't safe to try to
// drain a server that doesn't exist, or to start a server after draining
// has begun).
created, draining bool
}
var s *server.Server
errChan := make(chan error, 1)
go func() {
// Ensure that the log files see the startup messages immediately.
defer log.Flush()
defer log.RecoverAndReportPanic(startCtx)
defer sp.Finish()
if err := func() error {
if err := serverCfg.InitNode(); err != nil {
return errors.Wrap(err, "failed to initialize node")
}
log.Info(startCtx, "starting cockroach node")
if envVarsUsed := envutil.GetEnvVarsUsed(); len(envVarsUsed) > 0 {
log.Infof(startCtx, "using local environment variables: %s", strings.Join(envVarsUsed, ", "))
}
var err error
s, err = server.NewServer(serverCfg, stopper)
if err != nil {
return errors.Wrap(err, "failed to start server")
}
serverStatusMu.Lock()
serverStatusMu.created = true
draining := serverStatusMu.draining
serverStatusMu.Unlock()
if draining {
return nil
}
if err := s.Start(startCtx); err != nil {
return errors.Wrap(err, "cockroach server exited with error")
}
// We don't do this in (*server.Server).Start() because we don't want it
// in tests.
if !envutil.EnvOrDefaultBool("COCKROACH_SKIP_UPDATE_CHECK", false) {
s.PeriodicallyCheckForUpdates()
}
pgURL, err := serverCfg.PGURL(url.User(sqlConnUser))
if err != nil {
return err
}
var buf bytes.Buffer
info := build.GetInfo()
tw := tabwriter.NewWriter(&buf, 2, 1, 2, ' ', 0)
fmt.Fprintf(tw, "CockroachDB node starting at %s\n", timeutil.Now())
fmt.Fprintf(tw, "build:\t%s %s @ %s (%s)\n", info.Distribution, info.Tag, info.Time, info.GoVersion)
fmt.Fprintf(tw, "admin:\t%s\n", serverCfg.AdminURL())
fmt.Fprintf(tw, "sql:\t%s\n", pgURL)
if len(serverCfg.SocketFile) != 0 {
fmt.Fprintf(tw, "socket:\t%s\n", serverCfg.SocketFile)
}
fmt.Fprintf(tw, "logs:\t%s\n", flag.Lookup("log-dir").Value)
if serverCfg.Attrs != "" {
fmt.Fprintf(tw, "attrs:\t%s\n", serverCfg.Attrs)
}
if len(serverCfg.Locality.Tiers) > 0 {
fmt.Fprintf(tw, "locality:\t%s\n", serverCfg.Locality)
}
for i, spec := range serverCfg.Stores.Specs {
fmt.Fprintf(tw, "store[%d]:\t%s\n", i, spec)
}
initialBoot := s.InitialBoot()
nodeID := s.NodeID()
if initialBoot {
if nodeID == server.FirstNodeID {
fmt.Fprintf(tw, "status:\tinitialized new cluster\n")
} else {
fmt.Fprintf(tw, "status:\tinitialized new node, joined pre-existing cluster\n")
}
} else {
fmt.Fprintf(tw, "status:\trestarted pre-existing node\n")
}
fmt.Fprintf(tw, "clusterID:\t%s\n", s.ClusterID())
fmt.Fprintf(tw, "nodeID:\t%d\n", nodeID)
if err := tw.Flush(); err != nil {
return err
}
msg := buf.String()
log.Infof(startCtx, "node startup completed:\n%s", msg)
if !log.LoggingToStderr(log.Severity_INFO) {
fmt.Print(msg)
}
return nil
}(); err != nil {
errChan <- err
}
}()
shutdownSpan := tracer.StartSpan("server shutdown")
defer shutdownSpan.Finish()
shutdownCtx := opentracing.ContextWithSpan(context.Background(), shutdownSpan)
var returnErr error
// Block until one of the signals above is received or the stopper
// is stopped externally (for example, via the quit endpoint).
select {
case err := <-errChan:
// SetSync both flushes and ensures that subsequent log writes are flushed too.
log.SetSync(true)
return err
case <-stopper.ShouldStop():
// Server is being stopped externally and our job is finished
// here since we don't know if it's a graceful shutdown or not.
<-stopper.IsStopped()
// SetSync both flushes and ensures that subsequent log writes are flushed too.
log.SetSync(true)
return nil
case sig := <-signalCh:
// We start synchronizing log writes from here, because if a
// signal was received there is a non-zero chance the sender of
// this signal will follow up with SIGKILL if the shutdown is not
// timely, and we don't want logs to be lost.
log.SetSync(true)
log.Infof(shutdownCtx, "received signal '%s'", sig)
if sig == os.Interrupt {
// Graceful shutdown after an interrupt should cause the process
// to terminate with a non-zero exit code; however SIGTERM is
// "legitimate" and should be acknowledged with a success exit
// code. So we keep the error state here for later.
returnErr = errors.New("interrupted")
msgDouble := "Note: a second interrupt will skip graceful shutdown and terminate forcefully"
fmt.Fprintln(os.Stdout, msgDouble)
}
go func() {
serverStatusMu.Lock()
serverStatusMu.draining = true
needToDrain := serverStatusMu.created
serverStatusMu.Unlock()
if needToDrain {
if _, err := s.Drain(server.GracefulDrainModes); err != nil {
log.Warning(shutdownCtx, err)
}
}
stopper.Stop(shutdownCtx)
}()
}
const msgDrain = "initiating graceful shutdown of server"
log.Info(shutdownCtx, msgDrain)
fmt.Fprintln(os.Stdout, msgDrain)
go func() {
ticker := time.NewTicker(5 * time.Second)
defer ticker.Stop()
for {
select {
case <-ticker.C:
log.Infof(shutdownCtx, "%d running tasks", stopper.NumTasks())
case <-stopper.ShouldStop():
return
}
}
}()
select {
case sig := <-signalCh:
returnErr = fmt.Errorf("received signal '%s' during shutdown, initiating hard shutdown", sig)
// This new signal is not welcome, as it interferes with the graceful
// shutdown process. On Unix, a signal that was not handled gracefully by
// the application should be visible to other processes as an exit code
// encoded as 128+signal number.
//
// Also, on Unix, os.Signal is syscall.Signal and it's convertible to int.
ErrorCode = 128 + int(sig.(syscall.Signal))
// NB: we do not return here to go through log.Flush below.
case <-time.After(time.Minute):
returnErr = errors.New("time limit reached, initiating hard shutdown")
// NB: we do not return here to go through log.Flush below.
case <-stopper.IsStopped():
const msgDone = "server drained and shutdown completed"
log.Infof(shutdownCtx, msgDone)
fmt.Fprintln(os.Stdout, msgDone)
}
return returnErr
}
// setupAndInitializeLoggingAndProfiling does what it says on the label.
// Prior to this however it determines suitable defaults for the
// logging output directory and the verbosity level of stderr logging.
// We only do this for the "start" command which is why this work
// occurs here and not in an OnInitialize function.
func setupAndInitializeLoggingAndProfiling(startCtx context.Context) (*stop.Stopper, error) {
// Default the log directory to the "logs" subdirectory of the first
// non-memory store. If more than one non-memory stores is detected,
// print a warning.
ambiguousLogDirs := false
pf := cockroachCmd.PersistentFlags()
f := pf.Lookup(logflags.LogDirName)
if !log.DirSet() && !f.Changed {
// We only override the log directory if the user has not explicitly
// disabled file logging using --log-dir="".
newDir := ""
for _, spec := range serverCfg.Stores.Specs {
if spec.InMemory {
continue
}
if newDir != "" {
ambiguousLogDirs = true
break
}
newDir = filepath.Join(spec.Path, "logs")
}
if err := f.Value.Set(newDir); err != nil {
return nil, err
}
}
// We need an output directory below. We use the current directory unless
// the log directory is configured, in which case we use that.
outputDirectory := "."
if logDir := f.Value.String(); logDir != "" {
outputDirectory = logDir
ls := pf.Lookup(logflags.LogToStderrName)
if !ls.Changed {
// Unless the settings were overridden by the user, silence
// logging to stderr because the messages will go to a log file.
if err := ls.Value.Set(log.Severity_NONE.String()); err != nil {
return nil, err
}
}
// Make sure the path exists.
if err := os.MkdirAll(logDir, 0755); err != nil {
return nil, err
}
log.Eventf(startCtx, "created log directory %s", logDir)
// Start the log file GC daemon to remove files that make the log
// directory too large.
log.StartGCDaemon()
}
if ambiguousLogDirs {
// Note that we can't report this message earlier, because the log directory
// may not have been ready before the call to MkdirAll() above.
log.Shout(startCtx, log.Severity_WARNING, "multiple stores configured"+
" and --log-dir not specified, you may want to specify --log-dir to disambiguate.")
}
if serverInsecure {
// Use a non-annotated context here since the annotation just looks funny,
// particularly to new users (made worse by it always printing as [n?]).
addr := serverConnHost
if addr == "" {
addr = "<all your IP addresses>"
}
log.Shout(context.Background(), log.Severity_WARNING,
"RUNNING IN INSECURE MODE!\n\n"+
"- Your cluster is open for any client that can access "+addr+".\n"+
"- Any user, even root, can log in without providing a password.\n"+
"- Any user, connecting as root, can read or write any data in your cluster.\n"+
"- There is no network encryption nor authentication, and thus no confidentiality.\n\n"+
"Check out how to secure your cluster: https://www.cockroachlabs.com/docs/secure-a-cluster.html")
}
// We log build information to stdout (for the short summary), but also
// to stderr to coincide with the full logs.
info := build.GetInfo()
log.Infof(startCtx, info.Short())
initMemProfile(startCtx, outputDirectory)
initCPUProfile(startCtx, outputDirectory)
initBlockProfile()
// Disable Stopper task tracking as performing that call site tracking is
// moderately expensive (certainly outweighing the infrequent benefit it
// provides).
stopper := initBacktrace(outputDirectory, stop.TrackTasks(false))
log.Event(startCtx, "initialized profiles")
return stopper, nil
}
func addrWithDefaultHost(addr string) (string, error) {
host, port, err := net.SplitHostPort(baseCfg.Addr)
if err != nil {
return "", err
}
if host == "" {
host = "localhost"
}
return net.JoinHostPort(host, port), nil
}
func getClientGRPCConn() (*grpc.ClientConn, *hlc.Clock, *stop.Stopper, error) {
// 0 to disable max offset checks; this RPC context is not a member of the
// cluster, so there's no need to enforce that its max offset is the same
// as that of nodes in the cluster.
clock := hlc.NewClock(hlc.UnixNano, 0)
stopper := stop.NewStopper()
rpcContext := rpc.NewContext(
log.AmbientContext{},
serverCfg.Config,
clock,
stopper,
)
addr, err := addrWithDefaultHost(serverCfg.AdvertiseAddr)
if err != nil {
return nil, nil, nil, err
}
conn, err := rpcContext.GRPCDial(addr)
if err != nil {
return nil, nil, nil, err
}
return conn, clock, stopper, nil
}
func getAdminClient() (serverpb.AdminClient, *stop.Stopper, error) {
conn, _, stopper, err := getClientGRPCConn()
if err != nil {
return nil, nil, err
}
return serverpb.NewAdminClient(conn), stopper, nil
}
func stopperContext(stopper *stop.Stopper) context.Context {
ctx, cancel := context.WithCancel(context.Background())
stopper.AddCloser(stop.CloserFn(cancel))
return ctx
}
// quitCmd command shuts down the node server.
var quitCmd = &cobra.Command{
Use: "quit",
Short: "drain and shutdown node\n",
Long: `
Shutdown the server. The first stage is drain, where any new requests
will be ignored by the server. When all extant requests have been
completed, the server exits.
`,
RunE: MaybeDecorateGRPCError(runQuit),
}
// checkNodeRunning performs a no-op RPC and returns an error if it failed to
// connect to the server.
func checkNodeRunning(ctx context.Context, c serverpb.AdminClient) error {
// Send a no-op Drain request.
stream, err := c.Drain(ctx, &serverpb.DrainRequest{
On: nil,
Shutdown: false,
})
if err != nil {
return errors.Wrap(err, "Failed to connect to the node: error sending drain request")
}
// Ignore errors from the stream. We've managed to connect to the node above,
// and that's all that this function is interested in.
for {
if _, err := stream.Recv(); err != nil {
if err != io.EOF {
log.Warningf(ctx, "unexpected error from no-op Drain request: %s", err)
}
break
}
}
return nil
}
// doShutdown attempts to trigger a server shutdown. When given an empty
// onModes slice, it's a hard shutdown.
//
// errTryHardShutdown is returned if the caller should do a hard-shutdown.
func doShutdown(ctx context.Context, c serverpb.AdminClient, onModes []int32) error {
// We want to distinguish between the case in which we can't even connect to
// the server (in which case we don't want our caller to try to come back with
// a hard retry) and the case in which an attempt to shut down fails (times
// out, or perhaps drops the connection while waiting). To that end, we first
// run a noop DrainRequest. If that fails, we give up.
if err := checkNodeRunning(ctx, c); err != nil {
return err
}
// Send a drain request and continue reading until the connection drops (which
// then counts as a success, for the connection dropping is likely the result
// of the Stopper having reached the final stages of shutdown).
stream, err := c.Drain(ctx, &serverpb.DrainRequest{
On: onModes,
Shutdown: true,
})
if err != nil {
// This most likely means that we shut down successfully. Note that
// sometimes the connection can be shut down even before a DrainResponse gets
// sent back to us, so we don't require a response on the stream (see
// #14184).
if grpcutil.IsClosedConnection(err) {
return nil
}
return errors.Wrap(err, "Error sending drain request")
}
for {
if _, err := stream.Recv(); err != nil {
if grpcutil.IsClosedConnection(err) {
return nil
}
// Unexpected error; the caller should try again (and harder).
return errTryHardShutdown{err}
}
}
}
type errTryHardShutdown struct{ error }
// runQuit accesses the quit shutdown path.
func runQuit(_ *cobra.Command, _ []string) (err error) {
defer func() {
if err == nil {
fmt.Println("ok")
}
}()
onModes := make([]int32, len(server.GracefulDrainModes))
for i, m := range server.GracefulDrainModes {
onModes[i] = int32(m)
}
c, stopper, err := getAdminClient()
if err != nil {
return err
}
ctx := stopperContext(stopper)
defer stopper.Stop(ctx)
errChan := make(chan error, 1)
go func() {
errChan <- doShutdown(ctx, c, onModes)
}()
select {
case err := <-errChan:
if err != nil {
if _, ok := err.(errTryHardShutdown); ok {
fmt.Printf("graceful shutdown failed: %s; proceeding with hard shutdown\n", err)
break
}
return err
}
return nil
case <-time.After(time.Minute):
fmt.Println("timed out; proceeding with hard shutdown")
}
// Not passing drain modes tells the server to not bother and go
// straight to shutdown.
return errors.Wrap(doShutdown(ctx, c, nil), "hard shutdown failed")
}