我在git上的问题是项目权限配置。 我已经通过启用“容器注册表”在设置->通用->可见性，项目功能，权限和启用容器注册表为我的项目(链接):

您可能需要在docker push之前将docker repo切换为private。

感谢Dean Wu提供的答案和ses的评论，在推送之前，请记得注销，然后从命令行登录到您的docker hub帐户

# you may need log out first `docker logout` ref. https://stackoverflow.com/a/53835882/248616
docker login

根据文件:

You need to include the namespace for Docker Hub to associate it with your account.
The namespace is the same as your Docker Hub account name.
You need to rename the image to YOUR_DOCKERHUB_NAME/docker-whale.

所以，这意味着你必须在推送之前标记你的图像:

docker tag firstimage YOUR_DOCKERHUB_NAME/firstimage

然后你就可以推它了。

docker push YOUR_DOCKERHUB_NAME/firstimage

对于那些试图将映像推送到自己的Nexus存储库管理器的人，请执行以下操作:

1)登录到您的Nexus存储库管理器(端口8443与特定的Docker主机存储库相关联)

sudo docker login xxx.mydomain.com:8443

2)标记图像与您的NEXUS服务器IP/DNS

sudo docker tag myimage:latest xxx.mydomain.com:8443/myimage:1.0.0

3)推送图片

sudo docker push xxx.mydomain.com:8443/myimage:1.0.0

如果您已经登录，如果您仍然得到错误。请按照步骤操作，

PS C:\Users\rohit\Docker> docker logout
Removing login credentials for https://index.docker.io/v1/

PS C:\Users\rohit\Docker> docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: rohithpoya
Password:*****************
Login Succeeded

Logging in with your password grants your terminal complete access to your account.
For better security, log in with a limited-privilege personal access token. Learn more at https://docs.docker.com/go/access-tokens/

PS C:\Users\rohit\Docker> docker push rohithpoya/mongo-enterprise:5                                                                                                                                                                       
The push refers to repository [docker.io/rohithpoya/mongo-enterprise]                                                                                                                                                                        83ee27b8fe98: Pushed

我在上码头工人初级课程时也遇到了同样的问题。我通过在docker push调用之前进行adocker登录来解决这个问题。

当我在标记图像时使用docker中心名时，它为我工作。(这里，xyz是一个docker中心名)

# Login to docker hub account 
docker login 

# tag image 
docker tag nginx xyz/nginx

# push image
docker push xyz/nginx