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I am taking a docker course by Stephen Grider where he sets up a Fibonacci series app that stores the index in PostgreSQL database. While calculating the value using redis. The entire thing is connected using docker-compose file. But due to some unknown issues, the API couldn't connect to the PostgreSQL and it shows the error. Any possible solution for this?

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  • That is either a network problem, or listen_addresses is set incorrectly, or PostgreSQL is not running.
    – Laurenz Albe
    Commented Jul 12, 2023 at 5:53
  • Hey. I have answered the question. Kindly go through it.
    – Sandeep M
    Commented Jul 13, 2023 at 3:25
  • Does this answer your question? Docker wait for postgresql to be running
    – Phil
    Commented Jul 13, 2023 at 5:16
  • Your answer shows that PostgreSQL was not started.
    – Laurenz Albe
    Commented Jul 13, 2023 at 6:17
  • Yes. It took some time to start after downloading. But the next time it started directly.
    – Sandeep M
    Commented Jul 14, 2023 at 3:41

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To my understanding, it occurs due to the time taken for resources to download and start up. On checking the logs, I found out that my server tried making connection even before postgres database has started. And I am guessing this might have resulted in an error. So to tackle this, I ran the command twice. The first docker-compose up --build to download the resources. The second time to connect them. As this time, the postgres is already downloaded, I didn't face the error.

If anyone has any solution as how to make api start only after postgres has downloaded and started, do answer.

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