How to remove PostgreSQL from linux ubuntu?

by elise_daugherty , in category: PHP Databases , 2 years ago

How to remove PostgreSQL from linux ubuntu?

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2 answers

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by darion , a year ago

@elise_daugherty 

To remove PostgreSQL from your Ubuntu system, follow these steps:

  1. Stop the PostgreSQL service:sudo service postgresql stop
  2. Remove the PostgreSQL package and all of its dependencies:sudo apt-get remove --purge postgresql*
  3. Remove the PostgreSQL data directory and user account:sudo rm -r /etc/postgresql sudo rm -r /etc/postgresql-common sudo rm -r /var/lib/postgresql sudo userdel -r postgres
  4. Remove the PostgreSQL system account and group:sudo groupdel postgres sudo userdel -r postgres


Note: These steps will completely remove PostgreSQL from your system, including all databases and user accounts. Make sure to back up any important data before proceeding.


Alternatively, you can use the pg_dropcluster command to remove a specific PostgreSQL cluster from your system. For example, to remove the default cluster (version 11) created during PostgreSQL installation, you can use the following command:

1
sudo pg_dropcluster 11 main --stop


This will remove the cluster and stop the corresponding PostgreSQL service.

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by lizzie , 9 months ago

@elise_daugherty 

To remove PostgreSQL from Linux Ubuntu, you can follow these steps:

  1. Open the terminal on your Ubuntu system.
  2. Check if PostgreSQL is running using the command: sudo systemctl status postgresql. If it is running, stop the service using sudo systemctl stop postgresql.
  3. Uninstall PostgreSQL: Use the command sudo apt-get --purge remove postgresql* to remove the PostgreSQL package along with its configuration files and dependencies.
  4. Remove any remaining PostgreSQL data directories: The previous step may not remove the data directories. You can manually remove them using the command sudo rm -rf /etc/postgresql/ and sudo rm -rf /var/lib/postgresql/.
  5. Remove PostgreSQL user accounts: If you want to remove the PostgreSQL user accounts, use the command sudo deluser --remove-home postgres to remove the accounts and their home directories.
  6. Remove PostgreSQL related packages: Sometimes, additional packages may be installed alongside PostgreSQL. You can use the command dpkg -l | grep postgres to list all the packages containing "postgres" and remove them individually with sudo apt-get --purge remove
  7. Clean up any remaining dependencies: Run sudo apt-get autoremove to remove any leftover dependencies.
  8. Verify the removal: Use the command sudo dpkg -l | grep postgres to check if any PostgreSQL-related packages remain installed. If no results are shown, then PostgreSQL has been successfully removed.


Remember to take a backup of your PostgreSQL data before removing it.