How to install Calagator on NixOS Latest

This tutorial will guide you through the installation process for the Calagator event aggregator on NixOS Latest.

Prerequisites

Before you start, make sure you have the following:

• Access to a terminal on a NixOS Latest system
• Root or sudo access

Step 1: Update system packages

To ensure that the system is up to date, update the package index and upgrade the system packages by running the following command:

sudo nixos-rebuild switch

Step 2: Install Calagator dependencies

To install Calagator, we need to install the following dependencies:

• Ruby
• PostgreSQL
• Node.js

To install these dependencies using the Nix package manager, create a new Nix file called calagator.nix:

sudo nano /etc/nixos/calagator.nix

Paste the following code into the file:

{ pkgs }: 

with pkgs;

let
  rubyPackages = ruby_2_6;
  nodePackages = nodejs-10_x;
in
  buildEnv {
    name = "calagator-env";

    paths = [
      postgresql
      rubyPackages
      nodePackages
    ];

    buildInputs = [
      zlib
      openssl
      readline
      libxml2
      libxslt
      imagemagick
      curl
      git
      gcc
      make
      postgresql
      nodejs-10_x
    ];
  }

Save and close the file.

Now, run the following command to install the dependencies:

sudo nix-env -i -f /etc/nixos/calagator.nix

Step 3: Download and configure Calagator

We will now download the latest version of Calagator and configure it.

Create a new directory for Calagator:

sudo mkdir /var/www/calagator

Clone the Calagator repository:

sudo git clone https://github.com/calagator/calagator.git /var/www/calagator

Create a new configuration file:

sudo cp /var/www/calagator/config/settings.yml.example /var/www/calagator/config/settings.yml

Edit the configuration file:

sudo nano /var/www/calagator/config/settings.yml

Set the following variables to match your configuration:

database: calagator
username: your_username
password: your_password
host: 127.0.0.1
port: 5432
environment: production

Save and close the file.

Step 4: Install Calagator dependencies

Run the following commands to install the Calagator dependencies:

cd /var/www/calagator
sudo gem install bundler
sudo bundle install --without development test --jobs $(nproc)
sudo npm install -g phantomjs-prebuilt
sudo npm install -g coffee-script
sudo npm install
sudo chmod -R 777 tmp/

Step 5: Configure PostgreSQL

Create a new PostgreSQL database and user for Calagator:

sudo su postgres
createdb calagator
createuser --createdb --encrypted --pwprompt calagator

Enter a password for the calagator user and remember it.

Update the PostgreSQL configuration file:

sudo nano /var/lib/pgsql/data/pg_hba.conf

Add the following lines to the file:

local   calagator        calagator                               trust
host    calagator        calagator     127.0.0.1/32               md5

Save and close the file.

Step 6: Migrate the database

We will now migrate the database schema:

cd /var/www/calagator
sudo RAILS_ENV=production bundle exec rake db:migrate

Step 7: Start the server

Finally, start the Calagator server:

cd /var/www/calagator
sudo RACK_ENV=production sudo shotgun -s thin -o 0.0.0.0 -p 3000 config.ru

You should now be able to access Calagator at http://localhost:3000.

Conclusion

Calagator is now installed and running on your NixOS Latest system. You can configure it further by following the official Calagator documentation.