Connect as User with No Password Set on Postgresql 8.4 via Jdbc

Connect as user with no password set on Postgresql 8.4 via JDBC

If you have pg_hba.conf set to require md5 authentication and the user has no password, then no authentication can occur.

ALTER USER the_user_name PASSWORD 'give_it_a_password';

Alternately, use ident or (for localhost only, unsafe) trust authentication for that user/db combo in pg_hba.conf if you really must have no password. This is usually a bad idea, it's much better to just set a password.

Demo:

$ psql -q -U postgres postgres
postgres=# CREATE USER nopw;
CREATE ROLE

$ psql -h localhost -U nopw postgres
Password for user nopw:               [pressed enter]
psql: fe_sendauth: no password supplied

$ psql -q -U postgres postgres
postgres=# ALTER USER nopw PASSWORD 'test';
postgres=# \q

$ psql -q -h localhost -U nopw postgres
Password for user nopw:            [entered 'test' then pressed enter]
postgres=> 

how to connect JDBC postgres connection without the password when no password is set

You can open a jdbc connection without specifying a password, but you probably should configure trust authentication for IP sockets. See more info here.

Connect to RDS using IAM result password error

First all i had a bug - i used the db name instead DBI resource ID

This is the expected format:

arn:aws:rds-db:region:account-id:dbuser:DbiResourceId/db-user-name

            

and here is the code

data "aws_iam_policy_document" "policy_fooweb_job" {
  statement {
    actions = [
      "rds-db:connect"
    ]
    effect = "Allow"
    resources = [
      "arn:aws:rds-db:${var.region}:${data.aws_caller_identity.current.account_id}:dbuser:${data.aws_db_instance.database.resource_id}/someUser"
    ]
  }
}

## get the db instance
data "aws_db_instance" "database" {
  db_instance_identifier = "company-oltp1"
}

Connection refused on connecting to postgresql:dbserver db to Databricks via JDBC connection

I'm able to connecting to Azure Database for PostgreSQL server to Databricks via JDBC connection.

You may try the below steps:

Prerequisites:

Azure Database for PostgreSQL server => JDBC Connection String

jdbc:postgresql://{server_name}.postgres.database.azure.com:5432/{your_database}?user={Admin_username}&password={your_password}&sslmode=require

Step 1: Connection Information

driver = "org.postgresql.Driver"
url = "jdbc:postgresql://cheprapostgresql.postgres.database.azure.com:5432/postgres?user=chepra@cheprapostgresql&password=XXXXXXXXXXXXXX&sslmode=require"
dbname = "postgres"
dbtable = "inventory"

Step 2: Reading the data

jdbcDF = spark.read \
    .format("jdbc") \
    .option("driver", driver)\
    .option("url", url)\
    .option("dbname", dbname) \
    .option("dbtable", dbtable)\
    .load()

Reference: This notebook shows you how to load data from JDBC databases using Spark SQL.

psql: FATAL: Ident authentication failed for user postgres

Did you set the proper settings in pg_hba.conf?

See https://ubuntu.com/server/docs/databases-postgresql how to do it.

JDBC to PostgreSQL Not working since upgrading Ubuntu

Per this site the default port is 5432, however, per the postgres.conf file that came installed by default the port is set to 5433...

port = 5433

So if someone else has this problem try the new port.

I think it has to do with the install incrementing the port when it sees the existing 8.4

How to set port number in doobie database url?

The port is part of the connection url:

val xa = Transactor.fromDriverManager[IO](
  "org.postgresql.Driver",     // driver classname
  "jdbc:postgresql://localhost:5432/world",     // connect URL (driver-specific)
  "user",                  // user
  "password"                           // password

Postgres and Atlassian Jira: driver issue

Connection refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.

By default, PostgreSQL listens only on the local loopback interface, so connecting to the public IP won't work. If you're connecting from localhost you don't need to anyway, just use localhost.

FATAL: Ident authentication failed for user "jiradbuser"

This is good, it shows that you're connecting to PostgreSQL successfully, then getting an authentication error when trying to log in.

Your PostgreSQL server install defaulted to ident authentication for TCP/IP connections, but the JIRA application isn't running under a unix user named "jiradbuser" so the connection is rejected. Change pg_hba.conf to use md5 instead of ident and set a password for the user. See the client authentication chapter in the docs, particularly, pg_hba.conf.

No suitable driver found for jdbc:postgresql://http://:5432/jiradb

I have no idea where you got the idea that that URL would work...

You want something like:

jdbc:postgresql://localhost:5432/jiradb

Creating user with password Authentication at Presto Database

Presto does not have the notion of users or storage of its own. It relies on the underlying data source. Which connectors are you using? If you're using the Hive connector, then depending on how it's configured you could connect as a particular Hive user.

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