嗨，我正在尝试在 WSL Ubuntu 中运行 rails db:create 并不断收到有关 postgres 的此错误

Question

This is my first time trying to set up postgres with rails and have tried so many different ways to get this working. Please help!

Error:

could not connect to server: Connection refused
        Is the server running on host "localhost" (127.0.0.1) and accepting
        TCP/IP connections on port 5432?
Couldn't create 'backend_development' database. Please check your configuration.
rails aborted!
PG::ConnectionBad: could not connect to server: Connection refused
        Is the server running on host "localhost" (127.0.0.1) and accepting
        TCP/IP connections on port 5432?

database.yml:

default: &default
  adapter: postgresql
  encoding: unicode
  username: postgres
  password: password
  host: localhost
  # For details on connection pooling, see Rails configuration guide
  # https://guides.rubyonrails.org/configuring.html#database-pooling
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>

When I run psql i receive this error again:

psql: error: could not connect to server: could not connect to server: No such file or directory
        Is the server running locally and accepting
        connections on Unix domain socket "/tmp/.s.PGSQL.5432"?

Answer 1

Do you have PostgreSQL installed properly? To check the version $ postgres --version . If it's not installed on your system run $ sudo apt-get install postgresql postgresql-contrib libpq-dev

If you have it installed login with

$sudo su - postgres

Then create a new user after logged in

$ createuser --pwprompt username

now create the database

$ createdb -O username database_name .