Whenever a connection tries to establish itself with your system, the firewall will refer to these rules to determine what the next step in action should be. In this guide, we will discuss some of the common rules and commands that go with the iptables firewall. It is typically available by default on Linux systems.

This means that it is software that allows you to configure a firewall on your system. Now, all exposed pods are accessible from any node (master node including).Iptables is a command-line firewall utility. The question is how to set up firewall correctly for a kubernetes claster? Do I need to do it manually or a cluster can manage it itself? Now I see, that kubernetes controls the entire host firewall and I am not sure if what I did was nesessary. #-A FORWARD -j REJECT -reject-with icmp-host-prohibited A INPUT -p tcp -dport 2379:2380 -j ACCEPT It helped, now I can access any exposed pod from outside the cluster.īefore installing the kubernetes cluster, I added some iptables rules to open some ports, which kubernetes would need. I fixed the issue with adding the option -iptables=false in docker daemon running command. I googled this problem and found that docker chages default iptables’ FORWARD rule to DROP, which messes up the cluster networking. Both kubernetes and docker make changes in my iptables rules. I could not access the pod from outside the cluster. When I created the first pod, I realized that the cluster networking did not work properly. I installed a kubernetes cluster with one master and two workers nodes.

Iptables dport