我正在尝试使用 Docker API 和 Docker Go 库 (https://github.com/docker/engine-api/) 构建 Docker 镜像。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)
}
}
错误总是一样的:
Error response from daemon: Cannot locate specified Dockerfile: dockerSrc/docker-debug-container/Dockerfile
或
Error response from daemon: Cannot locate specified Dockerfile: Dockerfile
我检查过的内容:
- 该文件夹存在于构建路径中
- 我尝试了相对路径和绝对路径
- 路径中没有软链接(soft link)
- 我为二进制文件和
Dockerfile
尝试了相同的文件夹 -
docker build <path>
有效 - 还有很多其他的东西
我的另一个选择是使用 RemoteContext
看起来它有效,但仅适用于完全自包含的 dockerfile,而不是具有“本地文件存在”的那些。
更新:
尝试通过 tar
作为缓冲区,但得到了相同的结果:
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)
最佳答案
以下对我有用;
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")
}
}
关于go - 从 Go 代码构建 Docker 镜像,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38804313/