It’s a valid question don’t know why people feel “doesn’t seem possible to answer that question”.
So, here’s how I do what you are trying to do:
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Pull postgres image from Docker Hub
docker pull postgres:latest
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Run the container using the below command
docker run -p 5432:5432 postgres
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Using docker’s inspect command find the IP
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Use that IP, PORT, Username, and Password to connect in PGADMIN
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You can also do a simple telnet like below to confirm if you can access docker postgres container:
telnet IP_ADDRESS 5432