【发布时间】：2019-04-17 01:22:37
【问题描述】：
我如何执行相当于：
docker run -v /host/path:/container/path image:tag
从 Go 使用官方 docker 客户端包？
我在 client.ContainerCreate() function 的 HostOption 和 ConfigOption 结构中尝试了不同的 Mounts 和 Volumes 选项，但无法完全弄清楚。
特别是，Volumes 成员（map[string]struct{} 类型）特别难以弄清楚如何使用，而且我找不到任何关于结构中应该存在哪些值的文档。
演示我的问题的代码：
package main
import (
"context"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
//"github.com/docker/docker/api/types/mount"
"github.com/docker/docker/client"
"github.com/docker/docker/pkg/stdcopy"
"log"
"os"
"path/filepath"
)
func getThisDir() string {
dir, err := filepath.Abs(filepath.Dir(os.Args[0]))
if err != nil {
panic(err)
}
return dir
}
func main() {
log.Println("Creating client")
cli, err := client.NewClientWithOpts(client.FromEnv)
if err != nil {
panic(err)
}
image := "ubuntu:18.04"
hostPath := getThisDir()
containerPath := "/host_files"
log.Printf(" Image: %s\n", image)
log.Printf(" Host Path: %s\n", hostPath)
log.Printf(" Container Path: %s\n", containerPath)
ctx := context.Background()
cli.NegotiateAPIVersion(ctx)
log.Println("Creating container")
var cont container.ContainerCreateCreatedBody
if cont, err = cli.ContainerCreate(
context.Background(),
&container.Config{
Image: image,
Entrypoint: []string{"/bin/bash", "-c", "ls -la " + containerPath},
Volumes: map[string]struct{}{
hostPath: {},
},
},
&container.HostConfig{
Runtime: "runsc",
/*
Mounts: []mount.Mount{
mount.Mount{
Type: mount.TypeVolume,
Source: hostPath,
Target: containerPath,
},
},
*/
},
nil,
"TEST_CONTAINER",
); err != nil {
panic(err)
}
defer func() {
log.Println("Cleaning up")
if err := cli.ContainerRemove(
context.Background(),
cont.ID,
types.ContainerRemoveOptions{
Force: true,
RemoveVolumes: true,
},
); err != nil {
panic(err)
}
}()
log.Println("Starting container")
if err = cli.ContainerStart(
context.Background(),
cont.ID,
types.ContainerStartOptions{},
); err != nil {
panic(err)
}
log.Println("Waiting for container to exit")
waitOk, waitErr := cli.ContainerWait(
ctx,
cont.ID,
container.WaitConditionNotRunning,
)
select {
case <-waitOk:
log.Println("Container exited normally!")
case err = <-waitErr:
log.Println("Error waiting")
panic(err)
}
log.Println("Should be done!")
logOutput, err := cli.ContainerLogs(
ctx,
cont.ID,
types.ContainerLogsOptions{
ShowStdout: true,
ShowStderr: true,
Follow: false,
},
)
if err != nil {
panic(err)
}
log.Println("Container output:")
stdcopy.StdCopy(os.Stdout, os.Stderr, logOutput)
}
编译并运行它会产生输出：
2019/04/16 20:42:21 Creating client
2019/04/16 20:42:21 Image: ubuntu:18.04
2019/04/16 20:42:21 Host Path: /home/user/go/src/test
2019/04/16 20:42:21 Container Path: /host_files
2019/04/16 20:42:21 Creating container
2019/04/16 20:42:22 Starting container
2019/04/16 20:42:22 Waiting for container to exit
2019/04/16 20:42:22 Container exited normally!
2019/04/16 20:42:22 Should be done!
2019/04/16 20:42:22 Container output:
ls: cannot access '/host_files': No such file or directory
2019/04/16 20:42:22 Cleaning up
如果取消注释与安装相关的行，则会得到以下输出：
2019/04/16 20:23:32 Creating client
2019/04/16 20:23:32 Image: ubuntu:18.04
2019/04/16 20:23:32 Host Path: /home/user/go/src/test
2019/04/16 20:23:32 Container Path: /host_files
2019/04/16 20:23:32 Creating container
panic: Error response from daemon: create /home/user/go/src/test: "/home/user/go/src/test" includes invalid characters for a local volume name, only "[a-zA-Z0-9][a-zA-Z0-9_.-]" are allowed. If you intended to pass a host directory, use absolute path
goroutine 1 [running]:
main.main()
/home/user/go/src/test/container.go:66 +0xb0c
错误消息没有意义，因为我 am 使用的是绝对路径。也许我应该重新阅读ContainerCreate 的文档。
更新 1
The docker engine API documentation 包含有关卷的更多详细信息 - 我开始认为我对 docker -v /host/path:/container/path 的工作方式有误 - 也许这实际上是绑定挂载而不是卷挂载。
更新 2
Rubber duck debugging FTW 我猜。删除Volumes 设置，重新添加Mounts 并将Type 更改为mount.TypeBind 使其工作：
2019/04/16 20:53:18 Creating client
2019/04/16 20:53:18 Image: ubuntu:18.04
2019/04/16 20:53:18 Host Path: /home/user/go/src/test
2019/04/16 20:53:18 Container Path: /host_files
2019/04/16 20:53:18 Creating container
2019/04/16 20:53:18 Starting container
2019/04/16 20:53:19 Waiting for container to exit
2019/04/16 20:53:19 Container exited normally!
2019/04/16 20:53:19 Should be done!
2019/04/16 20:53:19 Container output:
total XXXX
drwxr-xr-x 7 1000 1000 4096 Apr 17 03:51 .
drwxr-xr-x 34 root root 4096 Apr 17 03:53 ..
-rw-r--r-- 1 1000 1000 10390 Apr 16 12:16 Gopkg.lock
-rw-r--r-- 1 1000 1000 1021 Apr 16 12:16 Gopkg.toml
-rwxr-xr-x 1 1000 1000 12433827 Apr 17 03:53 container
-rw-r--r-- 1 1000 1000 2421 Apr 17 03:51 container.go
2019/04/16 20:53:19 Cleaning up
【问题讨论】：