Node.js, PostgreSQL error: no pg_hba.conf entry for host

问题

I am following this article ((http://nodeexamples.com/2012/09/21/connecting-to-a-postgresql-database-from-node-js-using-the-pg-module/). I have already deployed my app to heroku and currently using express, node.js, to try and connect to a PostgresSQL database in Heroku that I just installed. I get to the very end of the article and I use the command

node myfile.js

I get this error

error: no pg_hba.conf entry for host "...", user "...", database "...", ...

How do I go about creating one and where in my app directory should I put it?

Below is the entire error message. I changed the strings for IP address, user, and database but it looks basically just like it.

events.js:72
    throw er; // Unhandled 'error' event
          ^
error: no pg_hba.conf entry for host "00.000.000.00", user "username", database "databasename", SSL off
at Connection.parseE (/Users/user/workspace/MyApp/app/node_modules/pg/lib/connection.js:526:11)
at Connection.parseMessage (/Users/user/workspace/MyApp/app/node_modules/pg/lib/connection.js:356:17)
at Socket.<anonymous> (/Users/user/workspace/MyApp/app/node_modules/pg/lib/connection.js:105:22)
at Socket.emit (events.js:95:17)
at Socket.<anonymous> (_stream_readable.js:748:14)
at Socket.emit (events.js:92:17)
at emitReadable_ (_stream_readable.js:410:10)
at emitReadable (_stream_readable.js:406:5)
at readableAddChunk (_stream_readable.js:168:9)
at Socket.Readable.push (_stream_readable.js:130:10)

Edit: I did some more research and found that the 'pg_hba.conf' file is in my

/usr/local/var/postgres

and I added this line into the 'pg_hba.conf' file

# TYPE  DATABASE        USER            ADDRESS                 METHOD
 host   all             all                                     trust

also tried

# TYPE  DATABASE        USER            ADDRESS                 METHOD
host   all             all              0.0.0.0/0               md5

but it keeps saying there is no entry for my host, user, database, etc... is my 'pg_hba.conf' syntax wrong in any way?

回答1:

Change your connection code to use ssl. Following your linked example:

var conString = "pg://admin:guest@localhost:5432/Employees";
var client = new pg.Client(conString);
client.connect();

becomes:

var client = new pg.Client({
    user: "admin",
    password: "guest",
    database: "Employees",
    port: 5432,
    host: "localhost",
    ssl: true
}); 
client.connect();

https://github.com/brianc/node-postgres/wiki/Client#new-clientobject-config--client

回答2:

In the case sequelize ignores all of your efforts to turn ssl on, you can try to convince pg to enable ssl for all conncetions by default:

var pg = require('pg');
pg.defaults.ssl = true;

const Sequelize = require('sequelize');
const sequelize = new Sequelize('postgres://...');

回答3:

We ran into this error while upgrading the pg database on heroku from hobby tier to standard-0. SSL is required, but we didnt set it in our config.

Include in config when initialize new Sequelize(...)

"dialect": "postgres",
"dialectOptions": {
  "ssl": true
}

This trick was, that the ssl option is wrapped in dialectOptions. found here: https://github.com/sequelize/sequelize/issues/956#issuecomment-147745033

回答4:

You can also use the ENVIRONMENT CONFIG VARIABLE 'PGSSLMODE' to 'require' via Heroku's web interface or CLI.

Case: Postgres dB set up as a Heroku add-on and attached to app on a Heroku Dyno.

Heroku provides some pretty good support on how to connect to one of its add-on databases; however, it unfortunately leaves out (or, I missed it) any mention of what do to enforce SSL since all Heroku dB tiers starting with Standard-0 enforces SSL by default.

回答5:

What worked for me was a combination of above answers and a comment(from @schybo)

let cloud_config = {
  username: process.env.DB_USERNAME,
  database: process.env.DB_DATABASE,
  password: process.env.DB_PASSWORD,
  host: process.env.DB_HOSTNAME,
  port: 5432,
  ssl: true,
  dialect: 'postgres',
  dialectOptions: {
    "ssl": {"require":true }
  }
};

Use both ssl: true, and dialectOptions: { "ssl": {"require":true }}

Comment on Sequelize issue which is also added to the docs.

回答6:

Just add a flag to the client initialisation:

Change

const conString = "pg://admin:guest@localhost:5432/Employees"
const client = new pg.Client(conString);
client.connect();

const conString = "pg://admin:guest@localhost:5432/Employees"
const client = new pg.Client({
  connectionString: process.env.DATABASE_URL,
  ssl: true
});
client.connect();

回答7:

setting ssl: true worked for me

let pg = require('pg');

let pgClient = new pg.Client({
    user: "admin",
    password: "guest",
    database: "Employees",
    port: 5432,
    host: "localhost",
    ssl: true
}); 
pgClient.connect();

来源：https://stackoverflow.com/questions/25000183/node-js-postgresql-error-no-pg-hba-conf-entry-for-host

标签

node.js

postgresql

express

heroku