How to push a Docker image?

1. After you create a docker image, you may want to store it on the docker hub.

2. Before you push it, you need to name your image with the right image name & tag name.

3. To check you docker image name & tag name, you may want:

   BASH

   docker image ls

   and you may see something like this:

   BASH

   REPOSITORY   TAG       IMAGE ID       CREATED          SIZE
   <none>       <none>    a09c98bebda5   15 minutes ago   729MB

4. Give your docker image a image name/tag:

   BASH

   docker image tag <image_id> <image_name>:<tag_name>

   For example:

   BASH

   docker image tag a09c98bebda5 j3ydocker/frontend:latest
   # to check it again
   docker image ls
   
   REPOSITORY           TAG       IMAGE ID       CREATED          SIZE
   j3ydocker/frontend   latest    a09c98bebda5   39 minutes ago   729MB

5. The `<image_name>` is also used to point to the correspond repository when you do the push. If your docker account is `j3ydocker` you must name your image a name starting with `j3ydocker/.`

6. Now we can push it, just do:

   BASH

   docker image push j3ydocker/frontend