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Asked: 2024-09-27T06:27:38+05:30 In: ,

how to run postgresql on linux

I hope someone can help me with this. I’m trying to set up PostgreSQL on my Linux machine, but I’m running into some issues and it’s becoming quite frustrating. I’ve heard that PostgreSQL is a powerful relational database, and I really want to get it up and running for a new project I’m working on.

I’ve already checked my system to ensure it meets the requirements, but I’m unsure about the installation process. Should I be using `apt`, `yum`, or some other package manager based on my Linux distribution? I’m currently using Ubuntu, but I’m not certain if I need to add any repositories first.

Once installed, what are the next steps? Do I need to configure anything specific, like user permissions, or is everything ready to go out-of-the-box? Also, I’ve read something about initializing the database and adjusting system settings. If someone could guide me through the installation and initial setup process or point me to some resources, I would greatly appreciate it. I really want to start using PostgreSQL without running into further bumps along the way. Thanks in advance!

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    2 Answers

    1. Running PostgreSQL on Linux: A Rookie’s Guide

      So, you want to run PostgreSQL on your Linux machine? No worries! Here’s a simple guide to get you started. Buckle up!

      Step 1: Installing PostgreSQL

      First things first, you need to install PostgreSQL. Open your terminal (you can usually find it in your apps) and type:

      sudo apt update
      sudo apt install postgresql postgresql-contrib

      This will grab PostgreSQL and some handy extras. If you see a lot of text and it asks for your password, just type it in (you won’t see it while typing!). Hit Enter!

      Step 2: Starting PostgreSQL

      Now, let’s start the PostgreSQL service. Type this in your terminal:

      sudo systemctl start postgresql

      Oops! You might want PostgreSQL to start automatically when you turn on your machine. For that, type:

      sudo systemctl enable postgresql

      Step 3: Logging into PostgreSQL

      Time to get into the PostgreSQL shell. First, switch to the PostgreSQL user (it’s called ‘postgres’). Type:

      sudo -i -u postgres

      Now, you’re in the postgres world! To open up the PostgreSQL prompt, type:

      psql

      Congratulations! You’re now in the PostgreSQL command-line interface. It might look a bit weird, but you got this!

      Step 4: Creating a Database

      Let’s create a database. It’s super simple! Just type:

      CREATE DATABASE mydatabase;

      Replace mydatabase with whatever name you fancy. Just remember not to use spaces!

      Step 5: Quitting the PostgreSQL Prompt

      When you’re done chatting with PostgreSQL, type:

      \q

      And you’re back to the normal terminal. 🌟

      Common Commands (Because You’ll Forget)

      • To show databases: SELECT datname FROM pg_database;
      • To connect to a database: \c mydatabase
      • To get help: \?

      Wrapping It Up!

      And that’s pretty much it! You’re now ready to explore more and maybe even build cool projects. Just remember, if something goes wrong, Google is your best friend. Happy coding!


    2. To run PostgreSQL on a Linux system, first ensure that the PostgreSQL package is installed. This can be done using the package manager specific to your distribution. For Debian-based systems, use `sudo apt update && sudo apt install postgresql postgresql-contrib`, while for Red Hat-based systems, you can run `sudo yum install postgresql-server postgresql-contrib`. Once the installation is complete, you’ll need to initialize the database cluster with the command `sudo postgresql-setup initdb` (on Red Hat-based systems) or it may be automatically initialized (on Debian-based systems). After initialization, you can start the PostgreSQL service using `sudo systemctl start postgresql`, and enable it to start on boot with `sudo systemctl enable postgresql`.

      Next, you’ll want to configure user access and authentication. By default, PostgreSQL creates a user named `postgres`. You can switch to this user using `sudo -i -u postgres` and access the PostgreSQL prompt with `psql`. From here, you can create databases and users using SQL commands, for example, `CREATE DATABASE mydb;` and `CREATE USER myuser WITH PASSWORD ‘mypassword’;`. To grant this user access to the newly created database, execute `GRANT ALL PRIVILEGES ON DATABASE mydb TO myuser;`. Don’t forget to modify the `pg_hba.conf` file for authentication settings if you plan to allow remote access, and restart the service to apply the changes with `sudo systemctl restart postgresql`.

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