docker image push does not work

Question

I have created a new docker image with a

# docker build -t my-phpapache:7.4 .

Now, when I try to make

# docker image push

I'm logged in to a Docker hub in a browser. I see the errors:

$ docker image push --all-tags docker.io/library/my-phpapache
The push refers to repository [docker.io/library/my-phpapache]
f04ed43187a6: Preparing 
0ff1b9aaef0c: Preparing 
c18803e039cd: Preparing 
a735fdc00d49: Preparing 
de7c912f2726: Preparing 
e835c99ddfc4: Waiting 
1f55d9e78afa: Waiting 
5aefa6797d83: Waiting 
70af74272d2e: Waiting 
58e3131f3b01: Waiting 
a1bae98a9430: Waiting 
752cff7a1101: Waiting 
be3607e92e69: Waiting 
2ffebc0bdeea: Waiting 
4c94b016478b: Waiting 
a9019c838a13: Waiting 
015643a98838: Waiting 
f2c64a370cec: Waiting 
d5b8874e6c41: Waiting 
9eb82f04c782: Waiting 
denied: requested access to the resource is denied

Answer 1

To push, you need write access to the destination repository. With Docker Hub, those repositories must be under your userid, or in an organization where you have write access. The default path you see added, docker.io/library, is used by official images, which makes pulling official images easier. But since you aren't the author of docker official images, that won't work for pushing.

That means you need to:

docker build -t your-user/your-image:v1 .
docker push your-user/your-image:v1

Where your-user is the same user you used when running docker login.