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Postgres Container Access with a SQL Client

 As you may have read I like to use Postgres’ official image in my multi-container Docker environment. Out of the box it needs little configuration. I typically access it through my Rails app using  rails db or  rails console . The other day, however, I needed to craft some SQL and those tools weren’t cutting it. I wanted to use my SQL client so I could work directly with the schema on something better than the command line. That required some tweaking to my DB container. By default the Postgres image uses Docker’s EXPOSE instruction to open port 5432 for other Docker containers. EXPOSE does not make the port…

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