Docker Hub API v2令牌认证问题

Question

目前，我正在研究Docker容器编排器的一个非常轻的版本，我必须能够从公共Docker Hub注册表获取图像摘要。我想为此使用Docker Registry API v2。

我尝试使用下面的API调用来获取授权令牌：

curl https://auth.docker.io/token?service=index.docker.io&scope=repository:alpine:pull 

...我得到像下面的响应：

{"token":"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.eyJhY2Nlc3MiOltdLCJhdWQiOiJpbmRleC5kb2NrZXIuaW8iLCJleHAiOjE0NzQ1NDcyODMsImlhdCI6MTQ3NDU0Njk4MywiaXNzIjoiYXV0aC5kb2NrZXIuaW8iLCJqdGkiOiIzVTdCazF4dm9CLVA0MGJWVF9JSiIsIm5iZiI6MTQ3NDU0Njk4Mywic3ViIjoiIn0.516fS692WGHNi5Sc44iB8OFSLairrM6n1zNvVo5KXAxlsxsP4rE7VDmW5d0YqvTYeKfZAYIi9yEptx4xJlQ6DA"} 

似乎一切正常，我“M试图利用获取的令牌我的下一个API调用：

curl -i -H "Authorization: Bearer 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.eyJhY2Nlc3MiOltdLCJhdWQiOiJpbmRleC5kb2NrZXIuaW8iLCJleHAiOjE0NzQ1NDcyODMsImlhdCI6MTQ3NDU0Njk4MywiaXNzIjoiYXV0aC5kb2NrZXIuaW8iLCJqdGkiOiIzVTdCazF4dm9CLVA0MGJWVF9JSiIsIm5iZiI6MTQ3NDU0Njk4Mywic3ViIjoiIn0.516fS692WGHNi5Sc44iB8OFSLairrM6n1zNvVo5KXAxlsxsP4rE7VDmW5d0YqvTYeKfZAYIi9yEptx4xJlQ6DA" https://index.docker.io/v2/alpine/manifests/latest 

...这里我得到了什么：

HTTP/1.1 401 Unauthorized 
Content-Type: application/json; charset=utf-8 
Docker-Distribution-Api-Version: registry/2.0 
Www-Authenticate: Bearer realm="https://auth.docker.io/token",service="registry.docker.io",scope="repository:alpine:pull",error="invalid_token" 
Date: Thu, 22 Sep 2016 12:27:54 GMT 
Content-Length: 138 
Strict-Transport-Security: max-age=31536000 

{"errors":[{"code":"UNAUTHORIZED","message":"authentication required","detail":[{"Type":"repository","Name":"alpine","Action":"pull"}]}]} 

有没有人有想法为什么令牌认证失败这种简单的流程？

Answer 1

Www-Authenticate标题中的响应试图告诉你你需要什么，尽管它可能更有帮助。

第一件事：你要的service是registry.docker.io。

第二件事：scope中的存储库名称不完整。 Official repositories只有CLI的单一部分名称，如alpine，但在注册表中正确地称为library/alpine。

所以，你的令牌请求应该是：

curl "https://auth.docker.io/token?service=registry.docker.io&scope=repository:library/alpine:pull" 

然后你的形象的要求是：

curl --header "Authorization: Bearer eyJh..." https://index.docker.io/v2/library/alpine/manifests/latest 

然后你会得到响应。