Preparing the nodes

Ensure that the nodes meet the Calico system requirements.

To minimize Calico network issues, ensure that the nodes in your IBM® Cloud Private cluster meet the following requirements:

• For IPv4 networks, install a Linux® kernel version that is 3.10 or higher.
• Check the network settings. See Network settings for details.
• Ensure network connectivity across all nodes in your cluster. Check the connectivity from the master node to the worker nodes, the worker nodes to the master node, and between all worker nodes.
• Ensure that ports are open and no firewall rules are blocking these ports. For more information about the IBM Cloud Private default ports, see Default ports.

• Ensure that IP forwarding is enabled. To check the IP forwarding configuration, run the following command:

  sysctl net.ipv4.ip_forward
  

  If IP forwarding is enabled, net.ipv4.ip_forward = 1 is displayed.

  To enable IP forwarding between session and system restarts, add net.ipv4.ip_forward = 1 to the /etc/sysctl.conf file.

  To enable the change to the /etc/sysctl.conf file, run the following command:

  sysctl -p /etc/sysctl.conf