pgAdmin in a browser or Docker: setup decisions
When pgAdmin runs in Docker, your browser talks to pgAdmin and the container talks to PostgreSQL. Keep those two connections in mind during setup. A database address that works on your laptop may mean something different inside the container.
Check both connections
There are two separate paths: your browser reaches pgAdmin, and pgAdmin reaches PostgreSQL. Logging into the web page confirms the first connection. The database connection still needs to work. If PostgreSQL is on your laptop, localhost inside a container identifies that container, not automatically the laptop.
Write down the hostname and port for each path. For services on a shared container network, use the service name configured for that network. For a hosted PostgreSQL service, use its supplied endpoint and TLS requirements. Avoid changing the database firewall until you know which machine is actually connecting.
Use the official container instructions
The pgAdmin container guide documents the dpage/pgadmin4 image, initial account settings, persistent storage and proxy configuration. Use an explicit version appropriate to your environment and follow its documented configuration.
For a laptop-only experiment, bind the exposed web port to the loopback interface. For shared access, plan authentication, HTTPS, updates and the approved network boundary. Do not expose a temporary admin interface to the public internet merely to make a connection test easier.
Keep configuration through restarts
Containers are replaceable. Identify where application configuration and saved server definitions live, mount the documented persistent storage, and test a restart. Keep credentials out of copied commands, screenshots and public repositories. Backing up pgAdmin configuration is different from backing up the PostgreSQL databases it connects to.
Choose the deployment for the workflow
A team operating a shared administration environment may need a web deployment. An individual inspecting databases can often use a desktop client with less infrastructure. PlainDB is a desktop application for supported Mac and Windows systems; it does not provide a browser-hosted pgAdmin replacement. See PostgreSQL viewer options and the connection checklist.