Sets up iptables to use a script to maintain firewall rules. However this cookbook may be deprecated or heavily modified in favor of the general firewall cookbook, see Roadmap.
- [COOK-652] - create a firewall cookbook
- [COOK-688] - create iptables providers for all resources
The default recipe will install iptables and provides a ruby script
/usr/sbin/rebuild-iptables) to manage rebuilding
firewall rules from files dropped off in
See Roadmap for plans to replace the definition with LWRPs.
The definition drops off a template in
/etc/iptables.d after the
name parameter. The rule will get added to the local system firewall
through notifying the
rebuild-iptables script. See Examples below.
Ensure that the system is set up to use the definition and rebuild
recipe[iptables]. Then create templates with the
firewall rules in the cookbook where the definition will be used. See
Since certain chains can be used with multiple tables (e.g., PREROUTING),
you might have to include the name of the table explicitly (i.e., *nat,
*mangle, etc.), so that the
/usr/sbin/rebuild-iptables script can infer
how to assemble final ruleset file that is going to be loaded. Please note,
that unless specified otherwise, rules will be added under the filter
table by default.
To enable port 80, e.g. in an
httpd cookbook, create the following
# Port 80 for http -A FWR -p tcp -m tcp --dport 80 -j ACCEPT
This would go in the cookbook,
httpd/templates/default/http.erb. Then to use it in
To redirect port 80 to local port 8080, e.g., in the aforementioned
cookbook, created the following template:
*nat # Redirect anything on eth0 coming to port 80 to local port 8080 -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080
Please note, that we explicitly add name of the table (being *nat in this example above) where the rules should be added.
This would most likely go in the cookbook,
httpd/templates/default/http_8080.erb. Then to use it in
default["iptables"]["install_rules"] = true # install the default rules
License and Author
Copyright:: 2008-2011, Chef Software, Inc
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