Sets up iptables to use a script to maintain firewall rules.
- RHEL/CentOS and derivatives
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
The lwrp 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.
NOTE: In the 1.0 release of this cookbook the iptables_rule definition was converted
to a LWRP. This changes the behavior of disabling iptables rules. Previously a rule
could be disabled by specifying
enable false. You must now specify
recipe[iptables] to your runlist to ensure iptables is installed / running
and to ensure that the
rebuild-iptables script is on the system.
Then create use iptables_rule to add individual rules. See Examples.
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
my_httpd cookbook, create the following
# Port 80 for http -A FWR -p tcp -m tcp --dport 80 -j ACCEPT
This template would be located at:
my_httpd/templates/default/http.erb. Then within your recipe call:
iptables_rule 'http' do action :enable end
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,
my_httpd/templates/default/http_8080.erb. Then to use it in
iptables_rule 'http_8080' do action :enable end
License and Author
Copyright:: 2008-2015, Chef Software, Inc.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.