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I'm trying to connect to my Cloud SQL DB using SQLAlchemy from my cloud function but I can't seem to work out the correct connection string.

DATABASE_URL=postgres://$DB_USER:$_DB_PWD@/$DB_NAME?unix_socket=/cloudsql/$DB_INSTANCE

Which gives me the error:

pyscopg2.ProgrammingError: invalid dns: invalid connection option "unix_socket"

What is the correct way to connect to a Postgresql 9.6 DB over a unix socket using pyscopg2?

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The special keyword needed here is host:

DATABASE_URL=postgres://user:password@/dbname?host=/path/to/db

Note that the path in host should be a path, not the socket file itself (psycopg2 assumes the socket has the standard naming convention .s.PGSQL.5432)

https://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#unix-domain-connections

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7 Comments

For whatever reason this didn't work for me and I'm also facing the OP's issue.
Works for me, make sure not to add '.s.PGSQL.5432' at the end of the connection string only the directory it is in
I think you need postgresql instead of postgres currently (2021).
Even the linked documentation doesn't say explicitly where to put the port, trial and error for user "fred" connecting to db "big_db" via socket in "/tmp/big_db_sockets/.s.PGSQL.1234" seems to be: postgresql://fred@:1234/big_db?host=/tmp/big_db_sockets
what is troubling is that the official docs show a unix_sock query param that causes pyscopg2 to crash... => cloud.google.com/sql/docs/postgres/connect-run#connect_to so I'm really glad I came across this thread !
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