我正在尝试使用Docker API和Docker Go库构建Docker映像(https://github.com/docker/engine-api/).代码示例:
package main
import (
"fmt"
"github.com/docker/engine-api/client"
"github.com/docker/engine-api/types"
"golang.org/x/net/context"
)
func main() {
defaultHeaders := map[string]string{"User-Agent": "engine-api-cli-1.0"}
cli, err := client.NewClient("unix:///var/run/docker.sock", "v1.22", nil, defaultHeaders)
if err != nil {
panic(err)
}
fmt.Print(cli.ClientVersion())
opt := types.ImageBuildOptions{
CPUSetCPUs: "2",
CPUSetMems: "12",
CPUShares: 20,
CPUQuota: 10,
CPUPeriod: 30,
Memory: 256,
MemorySwap: 512,
ShmSize: 10,
CgroupParent: "cgroup_parent",
Dockerfile: "dockerSrc/docker-debug-container/Dockerfile",
}
_, err = cli.ImageBuild(context.Background(), nil, opt)
if err == nil || err.Error() != "Error response from daemon: Server error" {
fmt.Printf("expected a Server Error, got %v", err)
}
}
错误总是相同的:
守护进程的错误响应:无法找到指定的Dockerfile:dockerSrc/docker-debug-容器/Dockerfile
或者
守护进程的错误响应:无法找到指定的Dockerfile: Dockerfile
我检查过的东西:
Dockerfile
docker构建
我的另一个选择是使用RemoteContext
,它看起来很有效,但只适用于完全自包含的DockerFile,而不适用于具有“本地文件存在”的DockerFile。
更新:尝试将tar
作为缓冲区传递,但得到以下相同的结果:
dockerBuildContext, err := os.Open("<path to>/docker-debug- container/docker-debug-container.tar")
defer dockerBuildContext.Close()
opt := types.ImageBuildOptions{
Context: dockerBuildContext,
CPUSetCPUs: "2",
CPUSetMems: "12",
CPUShares: 20,
CPUQuota: 10,
CPUPeriod: 30,
Memory: 256,
MemorySwap: 512,
ShmSize: 10,
CgroupParent: "cgroup_parent",
// Dockerfile: "Dockerfile",
}
_, err = cli.ImageBuild(context.Background(), nil, opt)
以下是我的作品;
package main
import (
"archive/tar"
"bytes"
"context"
"io"
"io/ioutil"
"log"
"os"
"github.com/docker/docker/api/types"
"github.com/docker/docker/client"
)
func main() {
ctx := context.Background()
cli, err := client.NewEnvClient()
if err != nil {
log.Fatal(err, " :unable to init client")
}
buf := new(bytes.Buffer)
tw := tar.NewWriter(buf)
defer tw.Close()
dockerFile := "myDockerfile"
dockerFileReader, err := os.Open("/path/to/dockerfile")
if err != nil {
log.Fatal(err, " :unable to open Dockerfile")
}
readDockerFile, err := ioutil.ReadAll(dockerFileReader)
if err != nil {
log.Fatal(err, " :unable to read dockerfile")
}
tarHeader := &tar.Header{
Name: dockerFile,
Size: int64(len(readDockerFile)),
}
err = tw.WriteHeader(tarHeader)
if err != nil {
log.Fatal(err, " :unable to write tar header")
}
_, err = tw.Write(readDockerFile)
if err != nil {
log.Fatal(err, " :unable to write tar body")
}
dockerFileTarReader := bytes.NewReader(buf.Bytes())
imageBuildResponse, err := cli.ImageBuild(
ctx,
dockerFileTarReader,
types.ImageBuildOptions{
Context: dockerFileTarReader,
Dockerfile: dockerFile,
Remove: true})
if err != nil {
log.Fatal(err, " :unable to build docker image")
}
defer imageBuildResponse.Body.Close()
_, err = io.Copy(os.Stdout, imageBuildResponse.Body)
if err != nil {
log.Fatal(err, " :unable to read image build response")
}
}
@Mangirdas:盯着屏幕看足够长的时间确实有帮助——至少对我来说是这样。我已经被同样的问题困扰了一段时间。您使用tar文件是正确的(您的第二个例子)。如果您查看这里的API文档https://docs.docker.com/engine/reference/api/docker_remote_api_v1.24/#/build-image-from-a-dockerfile您可以看到它需要一个tar。在我的案例中,真正帮助我的是查看客户端、perl和ruby的其他实现。当被要求从目录构建镜像时,两者都会动态创建tar。不管怎样,你只需要把你的dockerBuildContext放在其他地方(参见cli。图像构建
dockerBuildContext, err := os.Open("/Path/to/your/docker/tarfile.tar")
defer dockerBuildContext.Close()
buildOptions := types.ImageBuildOptions{
Dockerfile: "Dockerfile", // optional, is the default
}
buildResponse, err := cli.ImageBuild(context.Background(), dockerBuildContext, buildOptions)
if err != nil {
log.Fatal(err)
}
defer buildResponse.Body.Close()
我还没有正确命名这些图像,但至少我可以创建它们...希望这能有所帮助。干杯
Docker包有一个从文件路径创建TAR的函数。这是CLI使用的东西。它不在客户端包中,因此需要单独安装:
import (
"github.com/mitchellh/go-homedir"
"github.com/docker/docker/pkg/archive"
)
func GetContext(filePath string) io.Reader {
// Use homedir.Expand to resolve paths like '~/repos/myrepo'
filePath, _ := homedir.Expand(filePath)
ctx, _ := archive.TarWithOptions(filePath, &archive.TarOptions{})
return ctx
}
cli.ImageBuild(context.Background(), GetContext("~/repos/myrepo"), types.ImageBuildOptions{...})