Learn How To Install PostgreSQL 11.1 On Arch Linux
Table of Contents
- Commands required to be ran as root are prefixed by
#, and ones that can be ran as a regular user by
$. The recommended way to run commands as root is to, as a regular user, prefix each of them with
Install PostgreSQL 11.1 Database
# pacman -S postgresql
If you run the Btrfs filesystem, you should consider disabling copy-on-write for the database directory:
# chattr +C /var/lib/postgres/data/
This package creates the user
postgres on your system.
Initialize the database cluster. This must be done by the new
postgres user, and this command will do this as long as your user account is setup with sudo privileges:
$ sudo -iu postgres initdb -D /var/lib/postgres/data
Start PostgreSQL, and make it start after every boot:
# systemctl enable --now postgresql
Connect to PostgreSQL, as database user
postgres which acts as the database root user:
# psql -U postgres
Then set a password:
postgres-# password postgres
Consider a Firewall
You may want to consider configuring a firewall. By default, PostgreSQL will listen on port
5432 not only from localhost, but also from anywhere on your public IP address. PostgreSQL will also only approve incoming connections from localhost, but external attempts will still reach PostgreSQL and get the following error:
no pg_hba.conf entry for host.
Although PostgreSQL is considered quite secure, it’s more secure to have a firewall not even give external packets to the PostgreSQL server, unless absolutely necessary. Even if direct remote access is desired, using a firewall to block the traffic and using a VPN would be more secure.
Prepare for Upgrades
pacman will upgrade PostgreSQL when new versions are released to the official Arch repositories, when you upgrade your entire Arch system by running the following command:
# pacman -Syu
It is strongly recommended to configure
pacman to not automatically install upgrades to PostgreSQL. When an upgrade is released and you upgrade your entire Arch system,
pacman will let you know a new version is available. Edit
/etc/pacman.conf, and add the following:
IgnorePkg = postgresql*
Handle Minor Version Upgrades
pacman shows you there is a minor version upgrade, such as
11.1, PostgreSQL’s versioning policy is that you can safely perform the upgrade. That said, it is a good idea to backup your database first.
To perform a minor upgrade, stop PostgreSQL and confirm it is stopped:
# systemctl stop postgresql # systemctl status postgresql
Then, force upgrading the packages:
# pacman -S postgresql postgresql-libs
# systemctl start postgresql
Handle Major Version Upgrades
pacman shows there is a major version upgrade, such as
12.x, it’s recommended to check PostgreSQL’s website, as well as Arch’s website, to see if there are steps you must perform to properly upgrade. In the past, when PostgreSQL has given such steps, skipping them prevented databases from working. It’ is highly recommended that you backup your database first, as these upgrades are more risky.
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