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# TURN server

You need an TURN server to connect participants that are behind a NAT firewall.

Installation is short:

```
apt install coturn
```

For sake of maintainability we'll move the only configuration file into its
own directoy:

```
mkdir /etc/coturn
mv /etc/turnserver.conf /etc/coturn
```

We need to tell systemd to start it with the configuration file on the new
place. Edit the service file with:

```
systemctl edit coturn
```

Contrary to what the comment suggests, only the parts you add will override
the content that's already there. We have to "clean" the `ExecStart` first,
before we assign a new line to it, so this is the bit we add:

```
[Service]
ExecStart=
ExecStart=/usr/bin/turnserver -c /etc/coturn/turnserver.conf --pidfile=
```

This takes care of the configuration file. Now, the configuration itself...