Hello,

I'm setting up my linode and securing my server using the following documentation: https://library.linode.com/securing-your-server

On executing the following command:

sudo chmod +x /etc/network/if-pre-up.d/firewall 

I'm receiving this message:

sudo: unable to resolve host amidala

Any help would be appreciated.

Is 'amidala' a reference to your Linode? Please provide the output from the following two commands:

cat /etc/hostname
cat /etc/hosts

Many thanks for replying.

alan@amidala:~$ cat /etc/hostname
amidala
alan@amidala:~$ cat /etc/hosts
127.0.0.1   localhost
127.0.1.1   ubuntu

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

Thanks again

Boomfelled,
You don't have any reference to 'amidala' in your hosts file. That's why it's not resolving. You may have missed this:
https://library.linode.com/getting-star ... -etc-hosts

Great, that's fixed it, I must have missed that somehow.

Thanks again for your help.

Glad I could help.