共计 9222 个字符，预计需要花费 24 分钟才能阅读完成。
本篇内容主要讲解“containerd 源码接口调用的方法是什么”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让丸趣 TV 小编来带大家学习“containerd 源码接口调用的方法是什么”吧!
源码接口调用详情从 ctr 调用 containerd-api
####checkpoint（用于快照，docker 目前该功能不完善）|ctr cmd | containerd-api | | ———– |——–| | list | /types.API/ListCheckpoint | | create | /types.API/CreateCheckpoint | | delete | /types.API/DeleteCheckpoint |
####containers |ctr cmd | containerd-api | | ———– |——–| | list、state| /types.API/State | | pause、resume、update | /types.API/UpdateContainer | | create | /types.API/CreateContainer | | stats | /types.API/Stats | | watch | /types.API/State, /types.API/Events | | exec | /types.API/Events, /types.API/AddProcess, /types.API/UpdateProcess | | kill | /types.API/Signal | | start | /types.API/Events, /types.API/CreateContainer , /types.API/UpdateProcess | | update | /types.API/UpdateContainer | ####events /types.API/Events ####state /types.API/State ####version /types.API/GetServerVersion –return result
从 containerd-api 至 supervisor 任务处理
注：API–server.go — daemon – supervisor.go(handleTask func) ####checkpoint |containerd-api | supervisor | | ———– |——–| | /types.API/ListCheckpoint (supervisor.GetContainersTask)| getContainers | | /types.API/CreateCheckpoint | createCheckpoint | | /types.API/DeleteCheckpoint | deleteCheckpoint |
####containers |containerd-api | supervisor | | ———– |——–| | /types.API/State /types.API/Stats (supervisor.GetContainersTask) | getContainers | | /types.API/UpdateContainer (supervisor.UpdateTask) | updateContainer | | /types.API/CreateContainer (supervisor.StartTask) | start | | /types.API/Events | Events| | /types.API/AddProcess | addProcess | | /types.API/UpdateProcess | updateProcess | | /types.API/Signal| signal|
从 supervisor 至 runtime（runC)
####checkpoint |supervisor | runtime | | ———– |——–| | getContainers | – | | createCheckpoint | (runtime)CheckPoint — exec.Command(c.runtime,arg….) | | deleteCheckpoint | (runtime)DeleteCheckpoint| ####containers |supervisor | runtime | | ———– |——–| | getContainers | – | | updateContainer |(runtime)Resume Pause UpdateResources– exec.Command(c.runtime,arg….) | | start | (runtime supervisor/worker.go) Start — exec.Command(c.shim,c.id,c.bundle,c.runtime)| | addProcess | (runtime) exec — exec.Command(c.shim,c.id,c.bundle,c.runtime) | | updateProcess | – | | signal | -|
## 以 createContainer 为例走读代码 ###deamon 启动监听 tasks 及 startTasks 进程 #### 进入 main.go main 方法调用 daemon 方法
app.Action = func(context *cli.Context) { if err := daemon(context); err != nil { logrus.Fatal(err)
}
}#### 进入 main.go daemon 方法
for i := 0; i 10; i++ { wg.Add(1)
w := supervisor.NewWorker(sv, wg)
go w.Start()
if err := sv.Start(); err != nil { return err}#### 初始化 supervisor/worker.go NewWorker 并启动监听 startTask 并处理
func NewWorker(s *Supervisor, wg *sync.WaitGroup) Worker {
return worker{
s: s,
wg: wg,
}
func (w *worker) Start() { defer w.wg.Done()
for t := range w.s.startTasks {
started := time.Now()
process, err := t.Container.Start(t.CheckpointPath, runtime.NewStdio(t.Stdin, t.Stdout, t.Stderr))
if err != nil {
logrus.WithFields(logrus.Fields{
error : err,
id : t.Container.ID(),
}).Error(containerd: start container)
t.Err - err
evt := DeleteTask{ ID: t.Container.ID(),
NoEvent: true,
Process: process,
}
w.s.SendTask(evt)
continue
}### 启动 supervisor/supervisor.go task 监听 task 并处理
func (s *Supervisor) Start() error {
logrus.WithFields(logrus.Fields{
stateDir : s.stateDir,
runtime : s.runtime,
runtimeArgs : s.runtimeArgs,
memory : s.machine.Memory,
cpus : s.machine.Cpus,
}).Debug(containerd: supervisor running)
go func() {
for i := range s.tasks { s.handleTask(i)
}###containers 容器创建示例 Ctl 控制台命令入口 ctr/main.go containersCommand
execCommand,
killCommand,
listCommand,
pauseCommand,
resumeCommand,
startCommand,
stateCommand,
statsCommand,
watchCommand,
updateCommand,####ctr/container.go
var startCommand = cli.Command{
Name: start ,
Usage: start a container ,
ArgsUsage: ID BundlePath”, ————…...
events, err := c.Events(netcontext.Background(), types.EventsRequest{})/* 事件创建 */
if err != nil { fatal(err.Error(), 1)
}
if _, err := c.CreateContainer(netcontext.Background(), r); err != nil {/* 容器创建 */
fatal(err.Error(), 1)
}
if context.Bool(attach) { go func() { io.Copy(stdin, os.Stdin)
if _, err := c.UpdateProcess(netcontext.Background(), types.UpdateProcessRequest{/* 更新进程 */
Id: id,
Pid: init ,
CloseStdin: true,
}); err != nil { fatal(err.Error(), 1)
}
restoreAndCloseStdin()
}()
if tty { resize(id, init , c)
go func() { s := make(chan os.Signal, 64)
signal.Notify(s, syscall.SIGWINCH)
for range s { if err := resize(id, init , c); err != nil { log.Println(err)
}
}
}()
}
waitForExit(c, events, id, init , restoreAndCloseStdin)
}
},###api 处理 ####api/grpc/types/api.pb.go
func (c *aPIClient) Events(ctx context.Context, in *EventsRequest, opts ...grpc.CallOption) (API_EventsClient, error) { stream, err := grpc.NewClientStream(ctx, _API_serviceDesc.Streams[0], c.cc, /types.API/Events , opts...)
if err != nil {
return nil, err
}
x := aPIEventsClient{stream}
if err := x.ClientStream.SendMsg(in); err != nil {
return nil, err
}
if err := x.ClientStream.CloseSend(); err != nil {
return nil, err
}
return x, nil
func (c *aPIClient) CreateContainer(ctx context.Context, in *CreateContainerRequest, opts ...grpc.CallOption) (*CreateContainerResponse, error) { out := new(CreateContainerResponse)
err := grpc.Invoke(ctx, /types.API/CreateContainer , in, out, c.cc, opts...)
if err != nil {
return nil, err
}
return out, nil
func (c *aPIClient) UpdateProcess(ctx context.Context, in *UpdateProcessRequest, opts ...grpc.CallOption) (*UpdateProcessResponse, error) { out := new(UpdateProcessResponse)
err := grpc.Invoke(ctx, /types.API/UpdateProcess , in, out, c.cc, opts...)
if err != nil {
return nil, err
}
return out, nil
}
func _API_Events_Handler(srv interface{}, stream grpc.ServerStream) error { m := new(EventsRequest)
if err := stream.RecvMsg(m); err != nil {
return err
}
return srv.(APIServer).Events(m, aPIEventsServer{stream})
func _API_CreateContainer_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) { in := new(CreateContainerRequest)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil { return srv.(APIServer).CreateContainer(ctx, in)
}
info := grpc.UnaryServerInfo{
Server: srv,
FullMethod: /types.API/CreateContainer ,
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) { return srv.(APIServer).CreateContainer(ctx, req.(*CreateContainerRequest))
}
return interceptor(ctx, in, info, handler)
func _API_UpdateProcess_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) { in := new(UpdateProcessRequest)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil { return srv.(APIServer).UpdateProcess(ctx, in)
}
info := grpc.UnaryServerInfo{
Server: srv,
FullMethod: /types.API/UpdateProcess ,
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) { return srv.(APIServer).UpdateProcess(ctx, req.(*UpdateProcessRequest))
}
return interceptor(ctx, in, info, handler)
}api/grpc/server/server.go 进入第一步中的 tasks 及 sendTasks 处理队列
func (s *apiServer) Events(r *types.EventsRequest, stream types.API_EventsServer) error {
events := s.sv.Events(t, r.StoredOnly, r.Id)
func (s *apiServer) CreateContainer(ctx context.Context, c *types.CreateContainerRequest) (*types.CreateContainerResponse, error) {
s.sv.SendTask(e)
apiC, err := createAPIContainer(r.Container, false)
func (s *apiServer) UpdateProcess(ctx context.Context, r *types.UpdateProcessRequest) (*types.UpdateProcessResponse, error) { e := supervisor.UpdateProcessTask{}
e.ID = r.Id
e.PID = r.Pid
e.Height = int(r.Height)
e.Width = int(r.Width)
e.CloseStdin = r.CloseStdin
s.sv.SendTask(e)
if err := -e.ErrorCh(); err != nil {
return nil, err
}
return types.UpdateProcessResponse{}, nil}####supervisor/create.go
func (s *Supervisor) start(t *StartTask) error {s.startTasks - task }####supervisor/worker.go
func (w *worker) Start() { defer w.wg.Done()
for t := range w.s.startTasks {####runtime/container.go
func (c *container) Start(checkpointPath string, s Stdio) (Process, error) { processRoot := filepath.Join(c.root, c.id, InitProcessID)
if err := os.Mkdir(processRoot, 0755); err != nil {
return nil, err
}
cmd := exec.Command(c.shim,
c.id, c.bundle, c.runtime,
) --- 执行 docker-containerd-shim 命令
cmd.Dir = processRoot
cmd.SysProcAttr = syscall.SysProcAttr{
Setpgid: true,
}
spec, err := c.readSpec()
if err != nil {
return nil, err
}
config := processConfig{
checkpoint: checkpointPath,
root: processRoot,
id: InitProcessID,
c: c,
stdio: s,
spec: spec,
processSpec: specs.ProcessSpec(spec.Process),
}
p, err := newProcess(config)
if err != nil {
return nil, err
}
if err := c.createCmd(InitProcessID, cmd, p); err != nil {
return nil, err
}
return p, nil
}查看 shim 的 Main 方法注释参数传递
// Arg0: id of the container // Arg1: bundle path // Arg2: runtime binary
##containerd-shim 接收后处理 ###containerd-shim/main.go
func start(log *os.File) error {
p, err := newProcess(flag.Arg(0), flag.Arg(1), flag.Arg(2))
if err != nil {
return err
defer func() { if err := p.Close(); err != nil { writeMessage(log, warn , err)
}
if err := p.create(); err != nil { p.delete()
return err
}###containerd-shim/process.go 跳转执行 runc 命令
func (p *process) create() error {cmd := exec.Command(p.runtime, args...)到此，相信大家对“containerd 源码接口调用的方法是什么”有了更深的了解，不妨来实际操作一番吧！这里是丸趣 TV 网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
