Set up the kubernetes integration.
Allow Kubelet to manage
Kubelets can automatically manage the required changes to
iptables based on how you choose your networking options for the pods. It is recommended to let kubelets manage the changes to
iptables. This ensures that the
iptables configuration remains in sync with pods networking configuration. Manually configuring
iptables with dynamic pod network configuration changes might hamper the communication between pods/containers and to the outside world. You might have
iptables rules too restrictive or too open.
Run the following command on each node:
ps -ef | grep kubelet. Verify that if the
--make-iptables-util-chains argument exists then it is set to true. If the
--make-iptables-util-chains argument does not exist, and there is a Kubelet config file specified by
--config, verify that the file does not set
If using a kubelet config file, edit the file to set
makeIPTablesUtilChains: true. If using command line arguments, edit the kubelet service file
/etc/systemd/system/kubelet.service.d/10-kubeadm.conf on each worker node and remove the
--make-iptables-util-chains argument from the
KUBELET_SYSTEM_PODS_ARGS variable. Based on your system, restart the kubelet service. For example:
systemctl daemon-reload systemctl restart kubelet.service
Kubelet would manage the
iptables on the system and keep it in sync. If you are using any other
iptables management solution, then there might be some conflicts.
--make-iptables-util-chains argument is set to true.
Version 6.9 Limitation and Control of Network Ports, Protocols, and Services