Hostnames

All computers (hosts) on the network have (or can have) a hostname. This is nothing more that what you might think of as the name of the computer. In the case of our robots, each robot has a hostname, e.g. platform3.

Setting hostnames

To change the hostname on an Ubuntu system, you need to modify it in several places. Here are the steps to change the hostname permanently:

Edit the /etc/hostname file:
```
sudo nano /etc/hostname
```
Replace the current hostname with the new one you want.
Update the /etc/hosts file:
```
sudo nano /etc/hosts
```
Find the line with the old hostname and update it to the new hostname.
Use the hostnamectl command to set the new hostname:
```
sudo hostnamectl set-hostname new-hostname
```
Replace new-hostname with your desired hostname.
To prevent cloud services from resetting the hostname, you may need to modify cloud-init configuration:
```
sudo nano /etc/cloud/cloud.cfg
```
Find the line preserve_hostname: false and change it to preserve_hostname: true.
Reboot your system to apply all changes:
```
sudo reboot
```