How to change password in postgresql

Change/reset postgresql user password on windows 7

Several days ago I install postgesql 9.2 version on my local computer. (OS windows 7)

Now I forgot my password and I can not login in pgAdmin.

How to change postgresql password on windows 7?

6 Answers 6

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You can find where the pg_hba.conf is located by typing in a psql command line:

Below steps helped me to reset the password-

Go to pg_hba.conf file at path e.g. C:\Program Files\PostgreSQL\10\data and add below line at the end,

Connect using PgAdmin or any software that you prefer and run query,

Remove the line that you added in step 1.

Edit pg_hba.conf to allow you to connect without a password. Then use ALTER USER to reset the password. Then change pg_hba.conf back again.

For the documentation on pg_hba.conf, see here:

Run your psql executable file and login into your database using your old password, use the following command to login:

In windows postgres stores password for automatic login at following path (only if you would have selected password save option while installation)

you can open this file in a text editor and see your password.

I am using postgres version 14.0 and Windows 10. To reset the password:

Type in your current password

3 Then type: \password postgres

It brings up the prompts to type the new password and confirm. Note for the psql command to work on the windows command prompt, you need to set the postgres bin folder on the path environment variable. You can just google how to do this.

Postgres Change Password

By Payal Udhani

Introduction to Postgres Change Password

In this article, we will learn how we can change the Postgres Change Password of the user if present and if not how we can assign a password to the user for further authenticated usage by him in the PostgreSQL database server. There are two methods to do so. The first method involves using the ALTER query statement to change the password and the second method is to use the meta-command \password in PostgreSQL’s psql utility.

To proceed with changing the password process, we first need to understand how password mechanism works in PostgreSQL and what password policy is set to the default superuser which is most often user named Postgres.

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In any Unix distribution system of PostgreSQL, there are two types of authentication methods namely ident and peer. The default authentication method depends on which version of PostgreSQL does it use and how is PostgreSQL installed on your machine.

Ident Authentication method: In this method, TCP port with 113 as port number authenticates the user’s credentials where the identification server of the operating system is running.

Peer Authentication Method: In the peer authentication method, the current user’s password of PostgreSQL is matched with the password of the operating system user’s password.

Syntax

Explanation: Using the above alter command the password of the user can be changed and along with that other options can also be reassigned.

Name: It is the name of the user or role whose properties or password you want to change.

Option: We can change multiple parameters and privileges associated with the user using this format.

CREATEDB: This can be specified if you want to give the privilege to the user to create a new database

NOCREATEDB: This can be mentioned if you want to restrict the user from creating any new database.

CREATEUSER: This property can be specified to allow the user to create new users.

NOCREATEUSER: When this property is mentioned in the query in the above format the user won’t be able to create new users.

ENCRYPTED: This property determines whether the password stored in the pg_catalog’s pg_shadow table is stored in the form of an MD5 encrypted format.

UNENCRYPTED: The password is not stored in encrypted format in pg_catalog. If neither ENCRYPTED or UNENCRYPTED property is specified and neither this is done while user creation then the default password storing mechanism is decided based on password_encryption configuration variable.

PASSWORD: The new password is the string that you want to set as the password for the user. If this field is not specified and the user doesn’t have any previously set password to it then no authentication will be done for the user and the user can log in to the system without mentioning the password. But in case if you switch to a password authentication system then the user won’t be able to log in.

VALID UNTIL expiry time: This field can be used if you want to allow the set password up to some specific period. This field if the timestamp up to which you want to permit the assigned password to work.

Examples to Implement Postgres Change Password

Below are examples mentioned:

Example #1

We will firstly login to the system by Postgres default user. Here we have assigned a password to the Postgres role already. So, we will enter the password.

Code:

Output:

Example #2

Further, let us check all the users which are present in the database server by firing the command using psql promo:

Code:

select username from pg_catalog.pg_user;

Output:

Example #3

Let us try to login using a user:

Code:

Output:

Example #4

As we have forgotten the password associated to that user assigned to it while its creation, we will reset it to pay by using the format 1 ALTER USER query in the following way:

Code:

ALTER USER a WITH ENCRYPTED PASSWORD ‘payal’;

Output:

As the output is ALTER ROLE. The password has been reset successfully.

ALTER USER name RENAME TO alteredName

This format is only used to alter the name of the user to some other name “alteredName”.

Example #5

Code:

ALTER USER a RENAME TO payal;

Output:

Example #6

Let us verify the available users in our database server now.

Code:

SELECT usename FROM pg_catalog.pg_user;

Output:

Example #7

Code:

ALTER USER name SET parameter < TO | = >

the parameter can be any configuration property of PostgreSQL. You can see all the configuration properties by firing the command

Output:

Example #8

ALTER USER name RESET parameter

This command is used to reset the value of any field related to the user. Example –

Now, in case if we want to reset the password of the payal user. we can do so by using the query statement :

Code:

ALTER USER payal RESET password;

Output:

That gives the output “ALTER ROLE” which means that password for payal user has been reset successfully.

Example #9

MetaCommand to change password: In PostgreSQL, we have this amazing functionality called meta-commands that can be used with the help of psql utility. MetaCommands are short commands which are provided to make the working

of database administrator easy and efficient. These metacommands internally fire the SQL commands which are basic like ALTER, CREATE, SELECT, etc. One such meta-command for changing the password of the user is available and named \password. It asks to enter the password and then reenter the password for confirmation and then sets the entered password for that user.

Let us check the working of metacommand with the help of an example. Suppose we want to change the password of Postgres user after login to the Postgres database. Then we will query for the same in the following steps:

Code:

Output:

Conclusion

We can change the password of the user either by using the ALTER command or metacommand \password in PostgreSQL.

Recommended Articles

This is a guide to Postgres Change Password. Here we discuss an introduction to Postgres Change Password, syntax, examples with code and output. You can also go through our other related articles to learn more –

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PostgreSQL Change User Password

Introduction to the PostgreSQL change user password tutorial

There are many different types of situations where you’ll need to perform a PostgreSQL change user password. For example, when a user changes roles, that is when certain permissions must be are given or retracted. Another circumstance could be when an employee leaves the company or a new employee joins. It’s easy to make a user password change in PostgreSQL. Well, this tutorial will show you how to accomplish that in a few steps.

Prerequisites to changing the user password in Postgres

Install and run PostgreSQL if you haven’t previously.

Make a sample PostgreSQL database. In it, create a table and add a few records. Ensure that you have permission to modify those records.

Finally, to prepare to make a PostgreSQL change user password, connect the PostgreSQL database to the server with this psql command:

Create a user role and password for your Postgres database

NOTE: Don’t be alarmed about the text case of the user names and roles. By default, they’ll format to all lowercase letters.

Use the SQL ‘CREATE ROLE’ keyword to create a new role with password

NOTE: The PostgreSQL server log or history is where the passwords are saved and located.

Grant privileges and role attributes to Postgres user

Change the user password with the ‘ALTER ROLE’ keyword

Create a temporary password for a PostgreSQL user

Sometimes, you’ll need to perform a PostgreSQL change user password by creating a temporary password. These types of passwords require an expiration clause.

Use VALID UNTIL and enter the date you want the password to inactivate. The user must create a new password before the expiration date you’ve indicated in the SQL statement:

Confirm that you set the temporary password.

Use the psql command to connect to PostgreSQL and change the user password

At any time, you can PostgreSQL change user password for a role you made.

You’ll see an Enter new password: message prompt. Input your new password. Next, you’ll be required to enter the new password again to verify that it matches the new one you inputted.

Conclusion to the PostgreSQL change user password tutorial

This concludes the user password change PostgreSQL tutorial. You learned how to create a new user and set up encrypted passwords. You also discovered how to grant database table access privileges. Setting up temporary passwords with expiration dates is a great way to help secure your databases too. Incorporate these PostgreSQL change user password steps into all of your projects starting today.

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How to change password of PostgreSQL

Are you trying to change the password of PostgreSQL? We can help you with it.

Here at Bobcares, we have seen several such PostgreSQL related queries as part of our Server Management Services for web hosts and online service providers.

Today we’ll take a look at the process of changing the PostgreSQL password.

A few facts about PostgreSQL

PostgreSQL is one of the most popular free and open-source relational database management systems.

It is mainly used as the primary data store or data warehouse for many webs, mobile, geospatial, and analytics applications.

How we change the password of PostgreSQL

Here are the steps our Support Engineers provide to our customers to change the password.

Note: Make sure that you have root access to the server.

1. First, switch to PostgreSQL user – postgres

In case, if you are working using a default PostgreSQL installation, then PostgreSQL will be configured with the default user postgres.

Since we logged in as a root user, we assume that the root doesn’t have a user for PostgreSQL. So we switch to PostgreSQL user by running the below command.

Then we connect to the PostgreSQL by running the below command.

You will be asked for a password now. Enter it.

2. Add/Change the PostgreSQL password

Here is the command we use to change the password of the current user.

Now enter the new password and hit enter again to confirm it as shown below.

After changing the password, you can quit it by entering

You can also do all the steps in a single command as below.

Also, the password of the PostgreSQL can be changed using the ALTER ROLE statement as below.

In the above statement, first, specify the username of which you want to change the password. Next, provide the new password within a single quote. For example, the following statement changes the password of the superuser to secret12345.

In some cases, you would wish to keep the password valid until a certain date and time. In such cases, you can use VALID UNTIL clause:

Note: If you omit the VALID UNTIL clause, then the password will be valid forever.

The following statement sets the expiration date for the password of the superuser to December 31, 2020:

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Conclusion

Today, we saw how our Support Engineers change the password of PostgreSQL using different methods.

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How to Set the Default User Password in PostgreSQL

ident authentication uses the operating system’s identification server running at TCP port 113 to verify the user’s credentials.

peer authentication on the other hand, is used for local connections and verifies that the logged in username of the operating system matches the username for the Postgres database.

Login and Connect as Default User

For most systems, the default Postgres user is postgres and a password is not required for authentication. Thus, to add a password, we must first login and connect as the postgres user.

If you successfully connected and are viewing the psql prompt, jump down to the Changing the Password section.

If you received an error stating that the database “postgres” doesn’t exist, try connecting to the template1 database instead and if successful, continue to Changing the Password.

Authentication Error

If you receive an authentication error when attempting to connect to the psql client, you may need to alter the Postgres authentication config file (pg_hfa.conf).

The auth config file is a list of authentication rules. Scroll down the file until you locate the first line displaying the postgres user in the third column (if such a line exists). Uncomment the line if necessary (remove the semicolon), or otherwise if the line is missing entirely, add the following line to the top of the file and save your changes:

Note: Some older versions of Postgres prefer the default authentication method of ident, but most modern installations will utilize peer as specified above instead. You may need to test both if your results differ.

Now with your configuration file updated, repeat the steps in the Login and Connect as Default User section to try to connect to as the default postgres user. Once successful, proceed with changing the password.

Changing the Password

With a connection now established to Postgres at the psql prompt, issue the ALTER USER command to change the password for the postgres user:

If successful, Postgres will output a confirmation of ALTER ROLE as seen above.

Finally, exit the psql client by using the \q command.

You’re all done. The default postgres user now has a password associated with the account for use in your other applications.