If you want to install and configure a Jabber/XMPP server on a VPS, a straightforward option is to use Prosody, a modern XMPP communication platform. The following guide will work for VPS setups running Ubuntu.
1. Update your Ubuntu system:
```
sudo apt-get update
sudo apt-get upgrade
```
1. Install Prosody:
Prosody is available in Ubuntu’s default repositories, so you can directly install it using the below command. ``` sudo apt-get install prosody ```1. Now you need to configure the domain that will be associated with the server. You can do this by adding a new file with the server’s domain.
```
sudo nano /etc/prosody/conf.d/example.com.cfg.lua
```
1. Paste the following into the file, replacing “example.com” with your domain.
```
VirtualHost “example.com“
enabled = true
```
If you wish to enable multiple domains, create a separate config file for each domain following the above process.
1. Next step is to configure the Prosody:
Edit the main configuration file:
```
sudo nano /etc/prosody/prosody.cfg.lua
```
Find the `admins = { }` section and replace with :
```
admins = { “admin@example.com” }
```
Add the following lines at the end of the file if they are not present (check and uncomment if already exist):
```
consider_bosh_secure = true
cross_domain_bosh = true
consider_websocket_secure = true
cross_domain_websocket = true
http_ports = { 5280 }
http_interfaces = { “0.0.0.0” }
https_address = “::”
https_ports = { 5281 }
```
1. Register an XMPP/Jabber admin user:
```
sudo prosodyctl register admin example.com your_password
```
1. Restart the Prosody service:
```
sudo systemctl restart prosody
```
1. Enable Prosody to start at boot:
```
sudo systemctl enable prosody
```
Now, you can use an XMPP/Jabber client to connect your server with the admin user and your password.
This is for a simple setup. Remember to configure the necessary security elements in a production environment to protect your server from potential threats.
Please replace “example.com” and “your\_password” with your actual domain name and desired password in the above commands.
