Postgresql linux default password

What’s the default superuser username/password for postgres after a new install?

I have just installed postgres 8.4 on Ubuntu 9.10 and it has never asked me to create a superuser. Is there a default superuser and its password? If not, how do I create a new one?

5 Answers 5

CAUTION The answer about changing the UNIX password for «postgres» through «$ sudo passwd postgres» is not preferred, and can even be DANGEROUS!

This is why: By default, the UNIX account «postgres» is locked, which means it cannot be logged in using a password. If you use «sudo passwd postgres», the account is immediately unlocked. Worse, if you set the password to something weak, like «postgres», then you are exposed to a great security danger. For example, there are a number of bots out there trying the username/password combo «postgres/postgres» to log into your UNIX system.

What you should do is follow Chris James‘s answer:

sudo -u postgres psql postgres # \password postgres Enter new password: 

To explain it a little bit. There are usually two default ways to login to PostgreSQL server:

1. By running the «psql» command as a UNIX user (so-called IDENT/PEER authentication), e.g.: sudo -u postgres psql . Note that sudo -u does NOT unlock the UNIX user.
2. by TCP/IP connection using PostgreSQL’s own managed username/password (so-called TCP authentication) (i.e., NOT the UNIX password).

So you never want to set the password for UNIX account «postgres». Leave it locked as it is by default.

Of course things can change if you configure it differently from the default setting. For example, one could sync the PostgreSQL password with UNIX password and only allow local logins. That would be beyond the scope of this question.

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Postgresql linux default password

При установке PostgreSQL по умолчанию к серверу имеет доступ только пользователь postgres , который создается инсталлятором в процессе установки программы.

Режим аутентификации для этой учетной записи в PostgreSQL установлен в ident , то есть позволяет авторизоваться только под пользователем postgres . В свою очередь учетная запись postgres создается как заблокированная для аутентификации и поэтому не имеет какого-либо предустановленного пароля.

Конечно же пароль можно установить принудительно, например через passwd postgres . При этом запись разблокируется, что при установке слабого пароля сделает уязвимой всю систему.

Одним из способов получения локального доступа к серверу через учетную запись postgres (без ее разблокировки) для первоначальной настройки является редактирование файла pg_hba.conf (который находится в папке /etc/postgresql/[версия]/main ) с целью разрешения локального соединения без проверки пароля:

# IPv4 local connections: host all all 127.0.0.1/32 trust # IPv6 local connections: host all all ::1/128 trust 

После редактирования файла необходимо перезагрузить сервер:

/etc/init.d/postgresql restart 

После этого можно подключиться к серверу для создания нужных баз данных и пользователей:

psql -U postgres -h localhost 

Соответственно для удаленного доступа к серверу, например через dbeaver , можно использовать связку с SSH .

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How to Set the Default User Password in PostgreSQL

Firstly, it is important to understand that for most Unix distributions, the default Postgres user neither requires nor uses a password for authentication. Instead, depending how Postgres was originally installed and what version you are using, the default authentication method will either be ident or peer .

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.

$ sudo -u postgres psql template1 

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).

Open the config file, typically located at /etc/postgresql/#.#/main/pg_hba.conf , where #.# is the Postgres version you are using:

$ sudo nano /etc/postgresql/9.3/main/pg_hba.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:

This authentication rule simply tells Postgres that for local connections established to all databases for the user postgres , authenticate using the peer protocol.

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:

postgres=# ALTER USER postgres PASSWORD 'myPassword'; ALTER ROLE 

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.

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What Is the Default Postgres Password and How to Change It

Discover the Postgres default password and how to change it for enhanced security. Follow our guide to secure your data from unauthorized access.

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PostgreSQL, also known as Postgres, is one of the most popular and powerful open-source relational database management systems. A default username and password are set for administrative purposes when installing Postgres. However, it is essential to change the default password to ensure that unauthorized users cannot gain access to your database. In this article, we will explore the risks of using the default Postgres password and provide you with a step-by-step guide to change it quickly and easily.

What’s the Default Postgres Password?

The default Postgres password is “ postgres ”. This is a pre-set value assigned to the database’s superuser account. The default password is set during installation and is generally easy to guess, making it a security risk for your database. Many users often leave The default password unchanged, making it an easy target for hackers to gain unauthorized access to your database. Therefore, changing the default Postgres password to a more secure and complex one is crucial.

How to Change the Default Postgres Password

Follow these 9 simple steps to change the default Postgres password:

• Open the command-line interface and launch the Postgres server as the user that installed it.
• Access the Postgres command prompt by typing » psql » in the command line and pressing the Enter key.
• Type the following command to change the default password for the Postgres user:

ALTER USER postgres WITH PASSWORD ‘new_password’;

Replace » new_password » with a unique and strong password.

• Exit the Postgres command prompt by typing » \q » and pressing the Enter key.
• Open pg_hba.conf file, located in the PostgreSQL data directory.
• Locate the line that starts with » local all postgres » and change the » peer » or » md5 » authentication method to » trust .»

This change allows the Postgres user to log in without a password.

• Save the file and close it.
• Restart the Postgres server to apply the changes.
• Test the new password by logging into the Postgres server using the following command:

Enter the new password when prompted.

Congratulations, you have successfully changed the default Postgres password! It is essential to use a strong and secure password and to keep it safe to protect your database from unauthorized access.

• Enhanced security : Changing the default Postgres password helps improve your database’s security by reducing the risk of unauthorized access . Default passwords are simple and easy to guess, and anyone with this knowledge can quickly gain access to your database. Changing the password to a more complex one ensures only authorized users can access your database.
• Prevents hacks and data breaches : Hackers target default passwords to access databases and steal sensitive information. Changing the Postgres default password ensures that your database is safe from such attacks and your important data is protected.
• Compliance with regulations : Certain regulations, such as HIPAA and PCI-DSS, require organizations to change default passwords to more complex ones. Therefore, changing the Postgres default password can help ensure your organization meets these regulatory requirements.
• Reduces the risk of internal threats : The default Postgres password is known to all database administrators and users, making it easy for anyone with access to the database to log in and make changes. Changing the default password reduces the risk of internal threats, where an employee may use the default password for unauthorized activities.
• Best practice : Changing the default passwords of all software applications and systems is generally considered the best practice to reduce the risk of unauthorized access. Changing the default Postgres password is a simple step that can go a long way in improving your database’s security and adhering to best practices.
• Peace of mind : Knowing that your database is secure and protected gives database administrators and users peace of mind. Changing the default Postgres password is a simple way to ensure your database’s security and protect against threats, giving you peace of mind in knowing your data is safe.

Wrapping Up

changing the default Postgres password is a simple and effective way to improve your database’s security and protect against unauthorized access. Default passwords pose a significant security risk and should be changed to ensure only authorized users can access your database. Following the step-by-step guide in this article, you can quickly and easily change the Postgres default password and reduce the risk of data breaches and hacks. It is important to maintain a strong and secure password and to adhere to best practices to ensure that your database remains safe and secure.

• Postgres is an open-source relational database management system that provides robustness and scalability.
• The default password for Postgres is often » postgres ,» which is prone to hacking and exploitation.
• Changing the default password is essential for securing your Postgres database and preventing unauthorized access.

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