api - 无法使用golang docker sdk从docker容器获取日志

Question

我想在Docker容器中编译不受信任的代码，所以我想测试exec命令

import (
"context"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/client"
log "github.com/sirupsen/logrus"
"io"
"os"
)

func main() {
dockerClient, err := client.NewClientWithOpts(client.WithVersion("1.38"))
if err != nil{
    log.Error("error when create dockerClient ",err)
}

ctx := context.Background()

container, err := dockerClient.ContainerCreate(ctx,&container.Config{
    Image:"golang",
    OpenStdin:true,
    Tty:true,
    AttachStdin:true,
    Cmd:[]string{"bash"},
    AttachStdout:true,
    AttachStderr:true,


},nil,nil,"")

if err := dockerClient.ContainerStart(ctx,container.ID,types.ContainerStartOptions{});err != nil{
    log.Error("error when start container", err)
    return
}

idResponse, err :=dockerClient.ContainerExecCreate(ctx,container.ID,types.ExecConfig{
    Cmd:[]string{"echo","hello"},
    Tty:true,
    AttachStderr:true,
    AttachStdout:true,
    AttachStdin:true,
    Detach:true,
})

if err := dockerClient.ContainerExecStart(ctx,idResponse.ID,types.ExecStartCheck{

}); err != nil{
    log.Error("error when exec start ", err)
}

reader, err :=dockerClient.ContainerLogs(ctx,container.ID,types.ContainerLogsOptions{
    ShowStdout:true,
    ShowStderr:true,


})

if err != nil{
    log.Error("error when containerLogs",err)
}

go io.Copy(os.Stdout,reader)

<- make(chan struct{})

}

如您所见，我创建了一个新的exec进程，执行了一个名为“echo hello”的新cmd，我想从运行容器中获取输出并显示在我的golang控制台中。但没有工作，您能帮我解决吗？我尝试了很多方法，但是没有用。

我也尝试删除 dockerClient.ContainerLogs块，替换为

conn, err :=dockerClient.ContainerAttach(ctx,container.ID,types.ContainerAttachOptions{
    Stdout:true,
    Stderr:true,
    Stdin:true,
    Stream:true,
    Logs:true,
})

go io.Copy(os.Stdout,conn.Reader)

但仍然无法从容器中获取日志。当我运行上述代码时，控制台为空，预期结果是控制台中出现“hello”。

Answer 1

代替ContainerExecStart，将其替换为ContainerExecAttach

attach, err := dockerClient.ContainerExecAttach(ctx, idResponse.ID, config)
if err != nil {
    return err
}
defer attach.Close()
go io.Copy(os.Stdout, attach.Reader)