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Asked: 2024-09-27T06:21:40+05:30 In: ,

how to run postgresql in linux

I’m trying to set up PostgreSQL on my Linux system, but I’m a bit overwhelmed and could use some guidance. I’ve installed the operating system, and now I need to get PostgreSQL up and running, but I’m not sure where to start. Should I be using a package manager like apt or yum, or is there a better way? I’ve read that there are different versions, and I want to ensure I’m installing the latest stable release, but I’m not sure how to check that.

Once I’ve installed it, I’m confused about how to initialize the database and start the PostgreSQL service. Do I need to create a specific user in the system or within PostgreSQL itself? What’s the best way to secure it after installation? I’ve seen reference to using command-line tools, but I’m not familiar with those yet. Additionally, how can I eventually connect to the database from a client application? I’d appreciate a step-by-step breakdown or any resources you could recommend, as I really want to get this working for my project. Any help would be greatly appreciated!

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    2 Answers


    1. To run PostgreSQL on a Linux system, first ensure that the PostgreSQL server is installed. You can usually install it via your package manager. For Debian-based systems like Ubuntu, use the command `sudo apt-get install postgresql postgresql-contrib`. For Red Hat-based systems, you might deploy with `sudo dnf install postgresql-server postgresql-contrib`. Once installed, you’ll need to initialize the database cluster if it’s not already set up. This can typically be achieved with `sudo service postgresql initdb` on Debian systems or `postgresql-setup initdb` on Red Hat systems. After initialization, start the PostgreSQL service using `sudo service postgresql start` or `systemctl start postgresql` depending on your init system. Ensure the service runs on boot with `sudo systemctl enable postgresql`.

      After starting the PostgreSQL server, you can connect to it using the `psql` command-line utility. By default, PostgreSQL uses the user ‘postgres’, so access the PostgreSQL shell with `sudo -i -u postgres` followed by `psql`. Once in the shell, you can create databases, users, and execute SQL commands. For multi-user environments, configure PostgreSQL’s `pg_hba.conf` for appropriate authentication and access controls. Ensure you also adjust your `postgresql.conf` file to set parameters like `listen_addresses` or `port` as required for your environment, and use `SELECT * FROM pg_settings;` in the `psql` shell to review current settings. Always remember to check the logs and perform routine maintenance to monitor the system’s performance and security.

    2. Running PostgreSQL on Linux Like a Total Noob

      So, you want to get PostgreSQL running on your Linux machine? No worries, it’s not as scary as it sounds. Let’s break this down step by step.

      Step 1: Install PostgreSQL

      First things first, you gotta install it. Open up your terminal (that black box where you type stuff) and run:

      sudo apt update
sudo apt install postgresql postgresql-contrib

      This will get you the PostgreSQL server and some handy extras. If you’re using a different Linux flavor, you might need some different commands, but Google can be your friend here!

      Step 2: Start the PostgreSQL Service

      Once it’s installed, you need to start the PostgreSQL service. Just type:

      sudo service postgresql start

      That should get it running. If you want to check if it’s running, you can do:

      sudo service postgresql status

      If everything’s cool, you’ll see a message saying it’s running.

      Step 3: Access PostgreSQL

      To access PostgreSQL, you’ll want to switch to the PostgreSQL user. Run:

      sudo -i -u postgres

      This basically takes you into the world of PostgreSQL. Now, you can enter the PostgreSQL command line by typing:

      psql

      Once you’re in, you’ll see a prompt that looks like postgres=#. This means you are ready to run some SQL commands!

      Step 4: Do Some Basic Stuff

      Like, if you want to create a database, just type:

      CREATE DATABASE mydb;

      And to see your databases, type:

      \l

      Pretty neat, huh?

      Step 5: Exit PostgreSQL

      When you are done playing around, you can exit by typing:

      \q

      And to go back to your normal user, just type:

      exit

      Easy-peasy!

      Need Help?

      If you get stuck, don’t panic! Just look up stuff online or check out the official PostgreSQL docs. There are tons of tutorials out there just waiting for you to discover them!

      And that’s pretty much it! Enjoy messing around with your new PostgreSQL playground. Happy coding!

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