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Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

Posted November 16, 2017 51.4k views
Linux CommandsUbuntu 16.04

I installed PostgreSQL on Ubuntu, I can view psql version with command psql –version.
but when I input comman sudo -i -u postgres, it shows error:
<^>psql: could not connect to server: No such file or directory
Is the server running locally and accepting connections on Unix domain socket “/var/run/postgresql/.s.PGSQL.5432”?<^>

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kamaln7 November 19, 2017

The error means that the Postgres server is not running. Try starting it:

sudo systemctl start postgresql

I believe the service name is postgresql, but if that doesn’t work, try typing sudo systemctl start postgres and pressing tab to auto-complete.

Make sure that the server starts on boot:

sudo systemctl enable postgresql
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