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On 09/10/2013 11:36 PM, Sam Kottler wrote:
Given the deny-by-default nature of security groups I think it makes
sense to disable firewalld in the AMI's. I haven't seen any other AMI's that
have a firewall enabled by default and we probably shouldn't break that pattern IMO.
Thoughts?
This is easily one of my least-favorite "features" of certain Linux
distributions.
Debian/Ubuntu images don't have a firewall enabled by default in their cloud images
because they don't have a firewall enabled at all in a default installation. At least
the last time I looked at them; maybe they've gotten smarter in the last couple of
years.
I'm not really sure I see a benefit here. There may not even be a second firewall in
front of the virtual machine; a user might turn it off because it's getting in the
way, or a cloud provider might not provide this feature at all. I know of at least one
public cloud provider which has an external firewall feature similar to AWS security
groups, but it's off by default. In this case I see plenty of downside.
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