"docker push"が効かなくて、焦った話。

＜事象＞ 環境は、Mac　M1
```
test@test-mac test0410 % docker images
REPOSITORY               TAG             IMAGE ID       CREATED        SIZE
ubuntu                   0.1.5           f3b2048369e5   2 days ago     69.2MB
test@test-mac test0410 %
```
この様な状態で、ubuntu:0.1.5を、Docker Hubにアップしようとした。
すると、変なエラー("denied: requested access to the resource is denied")が発生すると言う事象。

```
test@test-mac test0410 % docker push ubuntu:0.1.5
The push refers to repository [docker.io/bullyng/ubuntu]
An image does not exist locally with the tag: bullyng/ubuntu
test@test-mac test0410 % docker push bullyng/ubuntu      
Using default tag: latest
The push refers to repository [docker.io/bullyng/ubuntu]
An image does not exist locally with the tag: bullyng/ubuntu
test@test-mac test0410 % docker push ubuntu:0.1.5  
The push refers to repository [docker.io/library/ubuntu]
b9978542eff2: Preparing 
eb26b0ccdff8: Preparing 
c4db76e353d3: Preparing 
a90b58e3523c: Preparing 
874b048c963a: Preparing 
denied: requested access to the resource is denied
```
<解決策＞
まあ、ここに書いてある通り。
https://qiita.com/shundayo/items/4ae35930fe9f85f535b0

要は、docker hubのユーザー名とImage名を一致させないとダメ。

DockerのNameを調べる。

```
yonishik_jp@yonishik_jp-mac test0410 % docker ps -a                

a9e8a3e3e6bc   docker_demo_flask:latest            "python app.py"           2 days ago    Exited (0) 2 days ago                                                  thirsty_darwin
14de7bc61852   ubuntu:0.1.5                        "/bin/bash"               2 days ago    Exited (127) 2 days ago                                                relaxed_thompson

```

Docker Hubのユーザー名は、"dockerusrXXX"とする。
ユーザー名/ubuntu　で、一旦、保存。

```
docker commit relaxed_thompson dockerusrXXX/ubuntu
```

新しいイメージが作成されているのを確認。
```
test@test-mac test0410 % docker images
REPOSITORY               TAG             IMAGE ID       CREATED         SIZE
dockerusrXXX/ubuntu           latest          50d1ca518bc3   5 seconds ago   69.2MB
docker_demo_flask        bk0.1.1         5bf9f3f5f1f4   2 days ago      861MB
```

因みに、Docker Loginをしないで、PushするとErrorが発生する。

```
docker push dockerusrXXX/slotmachinex-alpine3
Using default tag: latest
The push refers to repository [docker.io/dockerusrXXX/slotmachinex-alpine3]
5be4b23e2c71: Preparing 
cb3b47dbc581: Preparing 
70fb497445e7: Preparing 
8851d19e9ae5: Preparing 
b93c1bd012ab: Preparing 
denied: requested access to the resource is denied
```

その場合は、Docker　Loginをしてから、再度Pushすること。
```
root@test-ubuntu22-amd:/opt/code/nativeimg# 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: dockerusrXXX
Password: 
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded
```

この状態で、Docker Hubにpushする。
```
test@test-mac test0410 % docker push dockerusrXXX/ubuntu
Using default tag: latest
The push refers to repository [docker.io/dockerusrXXX/ubuntu]
5d693d5667a2: Pushed 
b9978542eff2: Pushed 
eb26b0ccdff8: Pushed 
c4db76e353d3: Pushed 
a90b58e3523c: Pushed 
874b048c963a: Mounted from library/ubuntu 
latest: digest: sha256:d7e2bd51a6cd41001d367dd77e60a6f5553853a891f76d0557582eb2010416f9 size: 1564
```