The first step in direction of installing PostgreSQL on Amazon Linux 2 is to make sure our server is up to date. Ofcourse, an active internet connection to download the PostgreSQL packages.To install packages we need sudo or root user access.At least 1GB of free Hard disk space, 2GB of RAM, and a single-core CPU.Amazon Linux 2 server either on a local virtual machine, Docker, or AWS EC2 Instance.If you did not understand the preceding paragraph then read the next section.Let’s first confirm, you have all the necessary things to follow this tutorial: The bottom line is this: if you try to start an application program and it complains that it cannot connect to the database, you should consult your site administrator or, if that is you, the documentation to make sure that your environment is properly set up. The environment variable PGPORT might also have to be set. For example, if the database server machine is a remote machine, you will need to set the PGHOST environment variable to the name of the database server machine. If your site administrator has not set things up in the default way, you might have some more work to do. Be sure to follow closely the section about setting up the appropriate environment variables. If you are installing PostgreSQL yourself, then refer to Chapter 17 for instructions on installation, and return to this guide when the installation is complete. PostgreSQL can be installed by any unprivileged user no superuser ( root) access is required. Doing so is not hard and it can be a good exercise. If you are not sure whether PostgreSQL is already available or whether you can use it for your experimentation then you can install it yourself. If that is the case, you should obtain information from the operating system documentation or your system administrator about how to access PostgreSQL. It is possible that PostgreSQL is already installed at your site, either because it was included in your operating system distribution or because the system administrator already installed it. Before you can use PostgreSQL you need to install it, of course.
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