How to know if docker is already logged in to a docker registry server

Question

I\'m not sure if I have already logged in to a docker registry in cmd line by using cmd: docker login. How can you test or see whether you are logged in or not, without tryi

Answer 1

On windows you can inspect the login "authorizations" (auths) by looking at this file: [USER_HOME_DIR].docker\config.json

Example: c:\USERS\YOUR_USERANME.docker\config.json

It will look something like this for windows credentials

{
"auths": {
    "HOST_NAME_HERE": {},
    "https://index.docker.io/v1/": {}
},
"HttpHeaders": {
    "User-Agent": "Docker-Client/18.09.0 (windows)"
},
"credsStore": "wincred",
"stackOrchestrator": "swarm"
}