Key wrote:
If i bought a Lino 360 to begin with would it be possible to upgrade to Lino 540 as and when i needed extra ram and bandwidth?
Yup!
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Also can you buy extra hard disk space / bandwidth from the control panel, And if so how much and would it be added instantly?
Yes: RAM is $5/90MB/month, storage is $2/GB/month, bandwidth is $10/100GB/month. You usually come out ahead doing a full-fledged upgrade, but the extras can be handy if you just need some extra disk space for some maintenance or whatnot. Extras are added immediately, but RAM adjustments require a reboot and you can't resize active images.
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Also regarding the firewall on the machine would there be any restrictions like only being able to use a certain range of ports or are all ports open to be used with IP tables and so on?
Everything is wide open on Linode's end, and closing it up (if desired) is your responsibility. Upstream of the Atlanta datacenter there is some
port filtering, but that usually doesn't impact customers outside of some very specific situations. That's it, though.
EDIT: Dang it, Peter, you stole my thunder.