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Add pprof to runc-shim

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Signed-off-by: Henry Wang <henwang@amazon.com>
This commit is contained in:
Henry Wang 2024-05-03 01:05:13 +00:00
parent 8b5c218e5a
commit 243b803a19
10 changed files with 406 additions and 105 deletions
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104
cmd/containerd-shim-runc-v2/manager/manager_linux.go
View File

@ -23,6 +23,7 @@ import (
"errors"
"fmt"
"io"
"net"
"os"
"os/exec"
"path/filepath"
@ -126,6 +127,59 @@ func (m manager) Name() string {
return m.name
}
type shimSocket struct {
addr string
s *net.UnixListener
f *os.File
}
func (s *shimSocket) Close() {
if s.s != nil {
s.s.Close()
}
if s.f != nil {
s.f.Close()
}
_ = shim.RemoveSocket(s.addr)
}
func newShimSocket(ctx context.Context, path, id string, debug bool) (*shimSocket, error) {
address, err := shim.SocketAddress(ctx, path, id, debug)
if err != nil {
return nil, err
}
socket, err := shim.NewSocket(address)
if err != nil {
// the only time where this would happen is if there is a bug and the socket
// was not cleaned up in the cleanup method of the shim or we are using the
// grouping functionality where the new process should be run with the same
// shim as an existing container
if !shim.SocketEaddrinuse(err) {
return nil, fmt.Errorf("create new shim socket: %w", err)
}
if !debug && shim.CanConnect(address) {
return &shimSocket{addr: address}, errdefs.ErrAlreadyExists
}
if err := shim.RemoveSocket(address); err != nil {
return nil, fmt.Errorf("remove pre-existing socket: %w", err)
}
if socket, err = shim.NewSocket(address); err != nil {
return nil, fmt.Errorf("try create new shim socket 2x: %w", err)
}
}
s := &shimSocket{
addr: address,
s: socket,
}
f, err := socket.File()
if err != nil {
s.Close()
return nil, err
}
s.f = f
return s, nil
}
func (manager) Start(ctx context.Context, id string, opts shim.StartOpts) (_ shim.BootstrapParams, retErr error) {
var params shim.BootstrapParams
params.Version = 3
@ -146,44 +200,35 @@ func (manager) Start(ctx context.Context, id string, opts shim.StartOpts) (_ shi
break
}
}
address, err := shim.SocketAddress(ctx, opts.Address, grouping)
if err != nil {
return params, err
}
socket, err := shim.NewSocket(address)
if err != nil {
// the only time where this would happen is if there is a bug and the socket
// was not cleaned up in the cleanup method of the shim or we are using the
// grouping functionality where the new process should be run with the same
// shim as an existing container
if !shim.SocketEaddrinuse(err) {
return params, fmt.Errorf("create new shim socket: %w", err)
}
if shim.CanConnect(address) {
params.Address = address
return params, nil
}
if err := shim.RemoveSocket(address); err != nil {
return params, fmt.Errorf("remove pre-existing socket: %w", err)
}
if socket, err = shim.NewSocket(address); err != nil {
return params, fmt.Errorf("try create new shim socket 2x: %w", err)
}
}
var sockets []*shimSocket
defer func() {
if retErr != nil {
socket.Close()
_ = shim.RemoveSocket(address)
for _, s := range sockets {
s.Close()
}
}
}()
f, err := socket.File()
s, err := newShimSocket(ctx, opts.Address, grouping, false)
if err != nil {
if errdefs.IsAlreadyExists(err) {
params.Address = s.addr
return params, nil
}
return params, err
}
sockets = append(sockets, s)
cmd.ExtraFiles = append(cmd.ExtraFiles, s.f)
cmd.ExtraFiles = append(cmd.ExtraFiles, f)
if opts.Debug {
s, err = newShimSocket(ctx, opts.Address, grouping, true)
if err != nil {
return params, err
}
sockets = append(sockets, s)
cmd.ExtraFiles = append(cmd.ExtraFiles, s.f)
}
goruntime.LockOSThread()
if os.Getenv("SCHED_CORE") != "" {
@ -193,7 +238,6 @@ func (manager) Start(ctx context.Context, id string, opts shim.StartOpts) (_ shi
}
if err := cmd.Start(); err != nil {
f.Close()
return params, err
}
@ -233,7 +277,7 @@ func (manager) Start(ctx context.Context, id string, opts shim.StartOpts) (_ shi
return params, fmt.Errorf("failed to adjust OOM score for shim: %w", err)
}
params.Address = address
params.Address = sockets[0].addr
return params, nil
}

175
cmd/ctr/commands/pprof/pprof.go
View File

@ -65,16 +65,7 @@ var pprofGoroutinesCommand = &cli.Command{
},
},
Action: func(cliContext *cli.Context) error {
client := getPProfClient(cliContext)
debug := cliContext.Uint("debug")
output, err := httpGetRequest(client, fmt.Sprintf("/debug/pprof/goroutine?debug=%d", debug))
if err != nil {
return err
}
defer output.Close()
_, err = io.Copy(os.Stdout, output)
return err
return GoroutineProfile(cliContext, getPProfClient)
},
}
@ -89,16 +80,7 @@ var pprofHeapCommand = &cli.Command{
},
},
Action: func(cliContext *cli.Context) error {
client := getPProfClient(cliContext)
debug := cliContext.Uint("debug")
output, err := httpGetRequest(client, fmt.Sprintf("/debug/pprof/heap?debug=%d", debug))
if err != nil {
return err
}
defer output.Close()
_, err = io.Copy(os.Stdout, output)
return err
return HeapProfile(cliContext, getPProfClient)
},
}
@ -119,17 +101,7 @@ var pprofProfileCommand = &cli.Command{
},
},
Action: func(cliContext *cli.Context) error {
client := getPProfClient(cliContext)
seconds := cliContext.Duration("seconds").Seconds()
debug := cliContext.Uint("debug")
output, err := httpGetRequest(client, fmt.Sprintf("/debug/pprof/profile?seconds=%v&debug=%d", seconds, debug))
if err != nil {
return err
}
defer output.Close()
_, err = io.Copy(os.Stdout, output)
return err
return CPUProfile(cliContext, getPProfClient)
},
}
@ -150,18 +122,7 @@ var pprofTraceCommand = &cli.Command{
},
},
Action: func(cliContext *cli.Context) error {
client := getPProfClient(cliContext)
seconds := cliContext.Duration("seconds").Seconds()
debug := cliContext.Uint("debug")
uri := fmt.Sprintf("/debug/pprof/trace?seconds=%v&debug=%d", seconds, debug)
output, err := httpGetRequest(client, uri)
if err != nil {
return err
}
defer output.Close()
_, err = io.Copy(os.Stdout, output)
return err
return TraceProfile(cliContext, getPProfClient)
},
}
@ -176,16 +137,7 @@ var pprofBlockCommand = &cli.Command{
},
},
Action: func(cliContext *cli.Context) error {
client := getPProfClient(cliContext)
debug := cliContext.Uint("debug")
output, err := httpGetRequest(client, fmt.Sprintf("/debug/pprof/block?debug=%d", debug))
if err != nil {
return err
}
defer output.Close()
_, err = io.Copy(os.Stdout, output)
return err
return BlockProfile(cliContext, getPProfClient)
},
}
@ -200,27 +152,120 @@ var pprofThreadcreateCommand = &cli.Command{
},
},
Action: func(cliContext *cli.Context) error {
client := getPProfClient(cliContext)
debug := cliContext.Uint("debug")
output, err := httpGetRequest(client, fmt.Sprintf("/debug/pprof/threadcreate?debug=%d", debug))
if err != nil {
return err
}
defer output.Close()
_, err = io.Copy(os.Stdout, output)
return err
return ThreadcreateProfile(cliContext, getPProfClient)
},
}
func getPProfClient(cliContext *cli.Context) *http.Client {
// Client is a func that returns a http client for a pprof server
type Client func(cliContext *cli.Context) (*http.Client, error)
// GoroutineProfile dumps goroutine stack dump
func GoroutineProfile(cliContext *cli.Context, clientFunc Client) error {
client, err := clientFunc(cliContext)
if err != nil {
return err
}
debug := cliContext.Uint("debug")
output, err := httpGetRequest(client, fmt.Sprintf("/debug/pprof/goroutine?debug=%d", debug))
if err != nil {
return err
}
defer output.Close()
_, err = io.Copy(os.Stdout, output)
return err
}
// HeapProfile dumps the heap profile
func HeapProfile(cliContext *cli.Context, clientFunc Client) error {
client, err := clientFunc(cliContext)
if err != nil {
return err
}
debug := cliContext.Uint("debug")
output, err := httpGetRequest(client, fmt.Sprintf("/debug/pprof/heap?debug=%d", debug))
if err != nil {
return err
}
defer output.Close()
_, err = io.Copy(os.Stdout, output)
return err
}
// CPUProfile dumps CPU profile
func CPUProfile(cliContext *cli.Context, clientFunc Client) error {
client, err := clientFunc(cliContext)
if err != nil {
return err
}
seconds := cliContext.Duration("seconds").Seconds()
debug := cliContext.Uint("debug")
output, err := httpGetRequest(client, fmt.Sprintf("/debug/pprof/profile?seconds=%v&debug=%d", seconds, debug))
if err != nil {
return err
}
defer output.Close()
_, err = io.Copy(os.Stdout, output)
return err
}
// TraceProfile collects execution trace
func TraceProfile(cliContext *cli.Context, clientFunc Client) error {
client, err := clientFunc(cliContext)
if err != nil {
return err
}
seconds := cliContext.Duration("seconds").Seconds()
debug := cliContext.Uint("debug")
uri := fmt.Sprintf("/debug/pprof/trace?seconds=%v&debug=%d", seconds, debug)
output, err := httpGetRequest(client, uri)
if err != nil {
return err
}
defer output.Close()
_, err = io.Copy(os.Stdout, output)
return err
}
// BlockProfile collects goroutine blocking profile
func BlockProfile(cliContext *cli.Context, clientFunc Client) error {
client, err := clientFunc(cliContext)
if err != nil {
return err
}
debug := cliContext.Uint("debug")
output, err := httpGetRequest(client, fmt.Sprintf("/debug/pprof/block?debug=%d", debug))
if err != nil {
return err
}
defer output.Close()
_, err = io.Copy(os.Stdout, output)
return err
}
// ThreadcreateProfile collects goroutine thread creating profile
func ThreadcreateProfile(cliContext *cli.Context, clientFunc Client) error {
client, err := clientFunc(cliContext)
if err != nil {
return err
}
debug := cliContext.Uint("debug")
output, err := httpGetRequest(client, fmt.Sprintf("/debug/pprof/threadcreate?debug=%d", debug))
if err != nil {
return err
}
defer output.Close()
_, err = io.Copy(os.Stdout, output)
return err
}
func getPProfClient(cliContext *cli.Context) (*http.Client, error) {
dialer := getPProfDialer(cliContext.String("debug-socket"))
tr := &http.Transport{
Dial: dialer.pprofDial,
}
client := &http.Client{Transport: tr}
return client
return client, nil
}
func httpGetRequest(client *http.Client, request string) (io.ReadCloser, error) {

165
cmd/ctr/commands/shim/pprof.go Normal file
View File

@ -0,0 +1,165 @@
//go:build !windows
/*
Copyright The containerd 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.
*/
package shim
import (
"context"
"errors"
"net"
"net/http"
"strings"
"time"
"github.com/containerd/containerd/v2/cmd/ctr/commands/pprof"
"github.com/containerd/containerd/v2/pkg/namespaces"
"github.com/containerd/containerd/v2/pkg/shim"
"github.com/urfave/cli/v2"
)
var pprofCommand = &cli.Command{
Name: "pprof",
Usage: "Provide golang pprof outputs for containerd-shim",
Subcommands: []*cli.Command{
pprofBlockCommand,
pprofGoroutinesCommand,
pprofHeapCommand,
pprofProfileCommand,
pprofThreadcreateCommand,
pprofTraceCommand,
},
}
var pprofGoroutinesCommand = &cli.Command{
Name: "goroutines",
Usage: "Print goroutine stack dump",
Flags: []cli.Flag{
&cli.UintFlag{
Name: "debug",
Usage: "Output format, value = 0: binary, value > 0: plaintext",
Value: 2,
},
},
Action: func(cliContext *cli.Context) error {
return pprof.GoroutineProfile(cliContext, getPProfClient)
},
}
var pprofHeapCommand = &cli.Command{
Name: "heap",
Usage: "Dump heap profile",
Flags: []cli.Flag{
&cli.UintFlag{
Name: "debug",
Usage: "Output format, value = 0: binary, value > 0: plaintext",
Value: 0,
},
},
Action: func(cliContext *cli.Context) error {
return pprof.HeapProfile(cliContext, getPProfClient)
},
}
var pprofProfileCommand = &cli.Command{
Name: "profile",
Usage: "CPU profile",
Flags: []cli.Flag{
&cli.DurationFlag{
Name: "seconds",
Aliases: []string{"s"},
Usage: "Duration for collection (seconds)",
Value: 30 * time.Second,
},
&cli.UintFlag{
Name: "debug",
Usage: "Output format, value = 0: binary, value > 0: plaintext",
Value: 0,
},
},
Action: func(cliContext *cli.Context) error {
return pprof.CPUProfile(cliContext, getPProfClient)
},
}
var pprofTraceCommand = &cli.Command{
Name: "trace",
Usage: "Collect execution trace",
Flags: []cli.Flag{
&cli.DurationFlag{
Name: "seconds",
Aliases: []string{"s"},
Usage: "Trace time (seconds)",
Value: 5 * time.Second,
},
&cli.UintFlag{
Name: "debug",
Usage: "Output format, value = 0: binary, value > 0: plaintext",
Value: 0,
},
},
Action: func(cliContext *cli.Context) error {
return pprof.TraceProfile(cliContext, getPProfClient)
},
}
var pprofBlockCommand = &cli.Command{
Name: "block",
Usage: "Goroutine blocking profile",
Flags: []cli.Flag{
&cli.UintFlag{
Name: "debug",
Usage: "Output format, value = 0: binary, value > 0: plaintext",
Value: 0,
},
},
Action: func(cliContext *cli.Context) error {
return pprof.BlockProfile(cliContext, getPProfClient)
},
}
var pprofThreadcreateCommand = &cli.Command{
Name: "threadcreate",
Usage: "Goroutine thread creating profile",
Flags: []cli.Flag{
&cli.UintFlag{
Name: "debug",
Usage: "Output format, value = 0: binary, value > 0: plaintext",
Value: 0,
},
},
Action: func(cliContext *cli.Context) error {
return pprof.ThreadcreateProfile(cliContext, getPProfClient)
},
}
func getPProfClient(cliContext *cli.Context) (*http.Client, error) {
id := cliContext.String("id")
if id == "" {
return nil, errors.New("container id must be provided")
}
tr := &http.Transport{
Dial: func(_, _ string) (net.Conn, error) {
ns := cliContext.String("namespace")
ctx := namespaces.WithNamespace(context.Background(), ns)
s, _ := shim.SocketAddress(ctx, cliContext.String("address"), id, true)
s = strings.TrimPrefix(s, "unix://")
return net.Dial("unix", s)
},
}
return &http.Client{Transport: tr}, nil
}

3
cmd/ctr/commands/shim/shim.go
View File

@ -75,6 +75,7 @@ var Command = &cli.Command{
execCommand,
startCommand,
stateCommand,
pprofCommand,
},
}
@ -244,7 +245,7 @@ func getTaskService(cliContext *cli.Context) (task.TTRPCTaskService, error) {
s1 := filepath.Join(string(filepath.Separator), "containerd-shim", ns, id, "shim.sock")
// this should not error, ctr always get a default ns
ctx := namespaces.WithNamespace(context.Background(), ns)
s2, _ := shim.SocketAddress(ctx, cliContext.String("address"), id)
s2, _ := shim.SocketAddress(ctx, cliContext.String("address"), id, false)
s2 = strings.TrimPrefix(s2, "unix://")
for _, socket := range []string{s2, "\x00" + s1} {

2
integration/client/container_linux_test.go
View File

@ -365,7 +365,7 @@ func TestShimDoesNotLeakSockets(t *testing.T) {
t.Fatal(err)
}
s, err := shim.SocketAddress(ctx, address, id)
s, err := shim.SocketAddress(ctx, address, id, false)
if err != nil {
t.Fatal(err)
}

2
integration/issue7496_linux_test.go
View File

@ -157,7 +157,7 @@ func injectDelayToUmount2(ctx context.Context, t *testing.T, shimCli apitask.TTR
}
func connectToShim(ctx context.Context, t *testing.T, ctrdEndpoint string, version int, id string) shimcore.TaskServiceClient {
addr, err := shim.SocketAddress(ctx, ctrdEndpoint, id)
addr, err := shim.SocketAddress(ctx, ctrdEndpoint, id, false)
require.NoError(t, err)
addr = strings.TrimPrefix(addr, "unix://")

39
pkg/shim/shim.go
View File

@ -20,10 +20,13 @@ import (
"context"
"encoding/json"
"errors"
"expvar"
"flag"
"fmt"
"io"
"net"
"net/http"
"net/http/pprof"
"os"
"path/filepath"
"runtime"
@ -121,6 +124,7 @@ var (
id string
namespaceFlag string
socketFlag string
debugSocketFlag string
bundlePath string
addressFlag string
containerdBinaryFlag string
@ -143,6 +147,7 @@ func parseFlags() {
flag.StringVar(&namespaceFlag, "namespace", "", "namespace that owns the shim")
flag.StringVar(&id, "id", "", "id of the task")
flag.StringVar(&socketFlag, "socket", "", "socket path to serve")
flag.StringVar(&debugSocketFlag, "debug-socket", "", "debug socket path to serve")
flag.StringVar(&bundlePath, "bundle", "", "path to the bundle if not workdir")
flag.StringVar(&addressFlag, "address", "", "grpc address back to main containerd")
@ -435,7 +440,7 @@ func serve(ctx context.Context, server *ttrpc.Server, signals chan os.Signal, sh
return err
}
l, err := serveListener(socketFlag)
l, err := serveListener(socketFlag, 3)
if err != nil {
return err
}
@ -445,6 +450,13 @@ func serve(ctx context.Context, server *ttrpc.Server, signals chan os.Signal, sh
log.G(ctx).WithError(err).Fatal("containerd-shim: ttrpc server failure")
}
}()
if debugFlag {
if err := serveDebug(ctx); err != nil {
return err
}
}
logger := log.G(ctx).WithFields(log.Fields{
"pid": os.Getpid(),
"path": path,
@ -460,6 +472,31 @@ func serve(ctx context.Context, server *ttrpc.Server, signals chan os.Signal, sh
return reap(ctx, logger, signals)
}
func serveDebug(ctx context.Context) error {
l, err := serveListener(debugSocketFlag, 4)
if err != nil {
return err
}
go func() {
defer l.Close()
m := http.NewServeMux()
m.Handle("/debug/vars", expvar.Handler())
m.Handle("/debug/pprof/", http.HandlerFunc(pprof.Index))
m.Handle("/debug/pprof/cmdline", http.HandlerFunc(pprof.Cmdline))
m.Handle("/debug/pprof/profile", http.HandlerFunc(pprof.Profile))
m.Handle("/debug/pprof/symbol", http.HandlerFunc(pprof.Symbol))
m.Handle("/debug/pprof/trace", http.HandlerFunc(pprof.Trace))
srv := &http.Server{
Handler: m,
ReadHeaderTimeout: 5 * time.Minute,
}
if err := srv.Serve(l); err != nil && !errors.Is(err, net.ErrClosed) {
log.G(ctx).WithError(err).Fatal("containerd-shim: pprof endpoint failure")
}
}()
return nil
}
func dumpStacks(logger *log.Entry) {
var (
buf []byte

4
pkg/shim/shim_unix.go
View File

@ -49,13 +49,13 @@ func setupDumpStacks(dump chan<- os.Signal) {
signal.Notify(dump, syscall.SIGUSR1)
}
func serveListener(path string) (net.Listener, error) {
func serveListener(path string, fd uintptr) (net.Listener, error) {
var (
l net.Listener
err error
)
if path == "" {
l, err = net.FileListener(os.NewFile(3, "socket"))
l, err = net.FileListener(os.NewFile(fd, "socket"))
path = "[inherited from parent]"
} else {
if len(path) > socketPathLimit {

2
pkg/shim/shim_windows.go
View File

@ -42,7 +42,7 @@ func subreaper() error {
func setupDumpStacks(dump chan<- os.Signal) {
}
func serveListener(path string) (net.Listener, error) {
func serveListener(path string, fd uintptr) (net.Listener, error) {
return nil, errdefs.ErrNotImplemented
}

15
pkg/shim/util_unix.go
View File

@ -76,12 +76,16 @@ func AdjustOOMScore(pid int) error {
const socketRoot = defaults.DefaultStateDir
// SocketAddress returns a socket address
func SocketAddress(ctx context.Context, socketPath, id string) (string, error) {
func SocketAddress(ctx context.Context, socketPath, id string, debug bool) (string, error) {
ns, err := namespaces.NamespaceRequired(ctx)
if err != nil {
return "", err
}
d := sha256.Sum256([]byte(filepath.Join(socketPath, ns, id)))
path := filepath.Join(socketPath, ns, id)
if debug {
path = filepath.Join(path, "debug")
}
d := sha256.Sum256([]byte(path))
return fmt.Sprintf("unix://%s/%x", filepath.Join(socketRoot, "s"), d), nil
}
@ -286,7 +290,12 @@ func cleanupSockets(ctx context.Context) {
}
if len(socketFlag) > 0 {
_ = RemoveSocket("unix://" + socketFlag)
} else if address, err := SocketAddress(ctx, addressFlag, id); err == nil {
} else if address, err := SocketAddress(ctx, addressFlag, id, false); err == nil {
_ = RemoveSocket(address)
}
if len(debugSocketFlag) > 0 {
_ = RemoveSocket("unix://" + debugSocketFlag)
} else if address, err := SocketAddress(ctx, addressFlag, id, true); err == nil {
_ = RemoveSocket(address)
}
}