How to Install Centrifugo on Fedora CoreOS

Centrifugo is a real-time messaging service that allows you to build modern, scalable, and fast web applications. Follow this tutorial to learn how to install Centrifugo on Fedora CoreOS.

Prerequisites

Before proceeding with the tutorial, make sure that you have the following:

Fedora CoreOS Latest version installed.
Access to a terminal with sudo privileges.
Basic knowledge of the command-line interface.

Installing Centrifugo

Update the package manager for Fedora CoreOS:
```
sudo dnf update
```
Install Golang and GCC:
```
sudo dnf install golang gcc
```
Create a directory for your Centrifugo installation:
```
sudo mkdir /opt/centrifugo
```

Change the directory to /opt/centrifugo and download the latest version of Centrifugo:

cd /opt/centrifugo
sudo wget https://github.com/centrifugal/centrifugo/releases/download/v2.8.5/centrifugo-2.8.5-linux-amd64.zip

Extract the downloaded file:

sudo unzip centrifugo-2.8.5-linux-amd64.zip

Now, we need to create a configuration file for Centrifugo:

sudo nano /etc/centrifugo/config.json

This will create a new file at /etc/centrifugo/config.json. Add the following contents to the file:

{
    "secret": "your-secret-key",
    "admin_password": "your-admin-password",
    "api_key": "your-api-key",
    "log_level": "info",
    "redis": {
        "address": "localhost:6379",
        "connection_lifetime": "300s",
        "read_timeout": "500ms",
        "write_timeout": "500ms",
        "pool_size": 10,
        "idle_timeout": "600s"
    },
    "metrics": {
        "enabled": true,
        "listen_address": "localhost:9090"
    },
    "listen": "localhost:8000"
}

Replace the values for secret, admin_password, api_key, and listen with your own values. The redis and metrics sections are optional and can be removed if you don't need them.

Save and exit the file.

To start Centrifugo as a service, create a systemd unit file for it:

sudo nano /etc/systemd/system/centrifugo.service

Add the following content to the file:

[Unit]
Description=Centrifugo server
After=network.target

[Service]
Type=simple
ExecStart=/opt/centrifugo/centrifugo --config /etc/centrifugo/config.json
User=centrifugo
Group=centrifugo

[Install]
WantedBy=multi-user.target

Make sure to replace User and Group with the appropriate user and group of your Fedora CoreOS installation.

Save and exit the file.
Reload the systemd daemon:
```
sudo systemctl daemon-reload
```
Start the Centrifugo service:
```
sudo systemctl start centrifugo
```
Verify that the service is running without errors:
```
sudo systemctl status centrifugo
```
The output should show that the centrifugo service is active and running.
To make sure that the service starts on boot, enable it:
```
sudo systemctl enable centrifugo
```

Congratulations! You have installed Centrifugo on Fedora CoreOS. You should now be able to connect to it and use it in your real-time messaging applications.