Psql could not connect to server: No such file or directory, 5432 error?

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postgresql: Psql could not connect to server: No such file or directory, 5432 error?

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Saša Kalaba (https://stackoverflow.com/users/3501807/sa%c5%a1a-kalaba
Eugene Lem (https://stackoverflow.com/users/10964091/eugene-lem)
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Denis P (https://stackoverflow.com/users/11575732/denis-p)
horoyoi o (https://stackoverflow.com/users/10194999/horoyoi-o)
Nishith (https://stackoverflow.com/users/9744378/nishith)

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Related to: postgresql, vagrant