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I use one of the following two ways for this check:

1: View config.json file:

In case you are logged in to "private.registry.com" you will see an entry for the same as following in ~/.docker/config.json:

"auths": {
    "private.registry.com": {
        "auth": "gibberishgibberishgibberishgibberishgibberishgibberish"
    }
 }

2: Try docker login once again:

If you are trying to see if you already have an active session with private.registry.com, try to login again:

bash$ docker login private.registry.com
Username (logged-in-user):

If you get an output like the above, it means logged-in-user already had an active session with private.registry.com. If you are just promoted for username instead, that would indicate that there's no active session.

I use one of the following two ways for this check:

1: View config.json file:

In case you are logged in to "private.registry.com" you will see an entry for the same as following in ~/.docker/config.json:

"auths": {
    "private.registry.com": {
        "auth": "gibberishgibberishgibberishgibberishgibberishgibberish"
    }
 }

2: Try docker login once again:

If you are trying to see if you already have an active session with private.registry.com, try to login again:

bash$ docker login private.registry.com
Username (logged-in-user):

If you get an output like the above, it means logged-in-user already had an active session with private.registry.com. If you are just prompted for username instead, that would indicate that there's no active session.

I use one of the following two ways for this check:

###1: View config.json file:

In case you are logged in to "private.registry.com" you will see an entry for the same as following in ~/.docker/config.json:

"auths": {
    "private.registry.com": {
        "auth": "gibberishgibberishgibberishgibberishgibberishgibberish"
    }
 }

###2: Try docker login once again:

If you are trying t see if you already have an active session with private.registry.com, try to login again:

bash$ docker login private.registry.com
Username (logged-in-user):

If you get an output like the above, it means logged-in-use is already had an active session with private.registry.com. If you are just promoted for username instead, that would indicate that there's no active session.

I use one of the following two ways for this check:

1: View config.json file:

In case you are logged in to "private.registry.com" you will see an entry for the same as following in ~/.docker/config.json:

"auths": {
    "private.registry.com": {
        "auth": "gibberishgibberishgibberishgibberishgibberishgibberish"
    }
 }

2: Try docker login once again:

If you are trying to see if you already have an active session with private.registry.com, try to login again:

bash$ docker login private.registry.com
Username (logged-in-user):

If you get an output like the above, it means logged-in-user already had an active session with private.registry.com. If you are just promoted for username instead, that would indicate that there's no active session.

I use one of the following two ways for this check:

###1: View config.json file:

In case you are logged in to "private.registry.com" you will see an entry for the same as following in ~/.docker/config.json:

"auths": {
    "private.registry.com": {
        "auth": "gibberishgibberishgibberishgibberishgibberishgibberish"
    }
 }

###2: Try docker login once again:

If you are trying t see if you already have an active session with private.registry.com, try to login again:

bash$ docker login private.registry.com
Username (logged-in-user):

If you get an output like the above, it means logged-in-user is already have an active session with private.registry.com. If you are just promoted for username instead, that would indicate that there's no active session.

I use one of the following two ways for this check:

###1: View config.json file:

In case you are logged in to "private.registry.com" you will see an entry for the same as following in ~/.docker/config.json:

"auths": {
    "private.registry.com": {
        "auth": "gibberishgibberishgibberishgibberishgibberishgibberish"
    }
 }

###2: Try docker login once again:

If you are trying t see if you already have an active session with private.registry.com, try to login again:

bash$ docker login private.registry.com
Username (logged-in-user):

If you get an output like the above, it means logged-in-use is already had an active session with private.registry.com. If you are just promoted for username instead, that would indicate that there's no active session.