Ansible iptables4/7/2023 ![]() ![]() name : enable the epel repo yum : name=epel-release state=present # We need to install libselinux-python on the target # machine to be able to use Ansible to copy the nf # file to the /etc/ferm/ directory. This could be a separate role, but this # is left as an exercise for the reader. # The ferm program is in the epel repository so we need # to enable it. We can configure the behaviour above using the nf file below. Router we will set the policy of the forward chain to drop all connections. Output policy to accept all connections and because we are not configuring a ![]() We do not want to limit any outgoing connections so we will set the The behaviours that we want from the OUTPUT and FORWARD chains are Finally, we want to drop any incoming connections that do not match any rules.We want to be able to add custom rules using Ansible.We want to be able to ssh into the machine.We want the default policy to accept incoming connections.To avoid this scenario we will configure the default policy toĪccept incoming connections and to secure the server we will include a rule toĭrop any incoming connections that do not match any other rules.īelow is a list stating the behaviour that we want from the INPUT chain of Rules, including the rule to accept ssh connections, leaving the server To drop incoming connections and then accidentally flushing the connection The most common scenario for this is setting the default policy When configuring a firewall it is easy to lock oneself out of the machine one Program called ferm (for Easy Rule Making). However, managing firewalls using iptables can be a pain. I recommend that you have a look at howtogeek’s Beginner’s Guide to iptables, If you have not come across or managed iptables before Way to set up policy chains to allow or block traffic to, from and through the The standard tool for setting up firewalls on Linux is iptables. In this post we will thereforeĬonfigure a firewall for our machine. Installing this software as a service to be made more widely accessible one As the name implies GBrowse is a browser basedĪpplication and it serves web pages over http using Apache. We created an Ansible playbook for installing the Tjelvar Olsson About Posts Feed Newsletter How to manage firewalls using ferm and Ansible
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