Cloud9中的postgresql错误“无法连接到服务器：连接被拒绝”

Question

I'd like to setup postgresql for my rails app in Cloud9 .

The following error appeared when I tried to bundle exec rake db:create .

could not connect to server: Connection refused
        Is the server running on host "localhost" (::1) and accepting
        TCP/IP connections on port 5432?
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
  pool: 5
  username: <%= ENV['USERNAME'] %>
  password: <%= ENV['PASSWORD'] %>
  host:     localhost

development:
  <<: *default
  database: app_development

test:
  <<: *default
  database: app_test

production:
  <<: *default
  database: app_production

Gemfile

gem 'pg', '~> 0.18.2'

/etc/postgresql/9.3/main/ pg_hba.conf

# Database administrative login by Unix domain socket
local   localhost            ubuntu                                md5

# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
local   all             ubuntu                                    md5
# IPv4 local connections:
host    all             all             127.0.0.1/32            md5
# IPv6 local connections:
host    all             all             ::1/128                 md5

Although I found similar questions in stackoverflow, they don't work for me. It would be appreciated if you could advise me on how to avoid this error.

Answer 1

Configure the postgresql.conf file. You have to update the listen_addresses to all and make sure to uncomment that line by removing the # mark. So your listen_addresses should look like this listen_addresses = '*'