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// Copyright 2020 The gVisor 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 dockerutil
import (
"context"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"time"
)
// Profile represents profile-like operations on a container,
// such as running perf or pprof. It is meant to be added to containers
// such that the container type calls the Profile during its lifecycle.
type Profile interface {
// OnCreate is called just after the container is created when the container
// has a valid ID (e.g. c.ID()).
OnCreate(c *Container) error
// OnStart is called just after the container is started when the container
// has a valid Pid (e.g. c.SandboxPid()).
OnStart(c *Container) error
// Restart restarts the Profile on request.
Restart(c *Container) error
// OnCleanUp is called during the container's cleanup method.
// Cleanups should just log errors if they have them.
OnCleanUp(c *Container) error
}
// Pprof is for running profiles with 'runsc debug'. Pprof workloads
// should be run as root and ONLY against runsc sandboxes. The runtime
// should have --profile set as an option in /etc/docker/daemon.json in
// order for profiling to work with Pprof.
type Pprof struct {
BasePath string // path to put profiles
BlockProfile bool
CPUProfile bool
HeapProfile bool
MutexProfile bool
Duration time.Duration // duration to run profiler e.g. '10s' or '1m'.
shouldRun bool
cmd *exec.Cmd
stdout io.ReadCloser
stderr io.ReadCloser
}
// MakePprofFromFlags makes a Pprof profile from flags.
func MakePprofFromFlags(c *Container) *Pprof {
if !(*pprofBlock || *pprofCPU || *pprofGo || *pprofHeap || *pprofMutex) {
return nil
}
return &Pprof{
BasePath: filepath.Join(*pprofBaseDir, c.runtime, c.Name),
BlockProfile: *pprofBlock,
CPUProfile: *pprofCPU,
HeapProfile: *pprofHeap,
MutexProfile: *pprofMutex,
Duration: *duration,
}
}
// OnCreate implements Profile.OnCreate.
func (p *Pprof) OnCreate(c *Container) error {
return os.MkdirAll(p.BasePath, 0755)
}
// OnStart implements Profile.OnStart.
func (p *Pprof) OnStart(c *Container) error {
path, err := RuntimePath()
if err != nil {
return fmt.Errorf("failed to get runtime path: %v", err)
}
// The root directory of this container's runtime.
root := fmt.Sprintf("--root=/var/run/docker/runtime-%s/moby", c.runtime)
// Format is `runsc --root=rootdir debug --profile-*=file --duration=* containerID`.
args := []string{root, "debug"}
args = append(args, p.makeProfileArgs(c)...)
args = append(args, c.ID())
// Best effort wait until container is running.
for now := time.Now(); time.Since(now) < 5*time.Second; {
if status, err := c.Status(context.Background()); err != nil {
return fmt.Errorf("failed to get status with: %v", err)
} else if status.Running {
break
}
time.Sleep(500 * time.Millisecond)
}
p.cmd = exec.Command(path, args...)
if err := p.cmd.Start(); err != nil {
return fmt.Errorf("process failed: %v", err)
}
return nil
}
// Restart implements Profile.Restart.
func (p *Pprof) Restart(c *Container) error {
p.OnCleanUp(c)
return p.OnStart(c)
}
// OnCleanUp implements Profile.OnCleanup
func (p *Pprof) OnCleanUp(c *Container) error {
defer func() { p.cmd = nil }()
if p.cmd != nil && p.cmd.Process != nil && p.cmd.ProcessState != nil && !p.cmd.ProcessState.Exited() {
return p.cmd.Process.Kill()
}
return nil
}
// makeProfileArgs turns Pprof fields into runsc debug flags.
func (p *Pprof) makeProfileArgs(c *Container) []string {
var ret []string
if p.BlockProfile {
ret = append(ret, fmt.Sprintf("--profile-block=%s", filepath.Join(p.BasePath, "block.pprof")))
}
if p.CPUProfile {
ret = append(ret, fmt.Sprintf("--profile-cpu=%s", filepath.Join(p.BasePath, "cpu.pprof")))
}
if p.HeapProfile {
ret = append(ret, fmt.Sprintf("--profile-heap=%s", filepath.Join(p.BasePath, "heap.pprof")))
}
if p.MutexProfile {
ret = append(ret, fmt.Sprintf("--profile-mutex=%s", filepath.Join(p.BasePath, "mutex.pprof")))
}
ret = append(ret, fmt.Sprintf("--duration=%s", p.Duration))
return ret
}
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