Chapter 25. Other Configurations

25.1. Configuring the kernel on overcloud nodes

OpenStack Platform director includes parameters that configure the kernel on overcloud nodes.

ExtraKernelModules

Kernel modules to load. The modules names are listed as a hash key with an empty value:

  ExtraKernelModules:
    <MODULE_NAME>: {}
ExtraKernelPackages

Kernel-related packages to install prior to loading the kernel modules from ExtraKernelModules. The package names are listed as a hash key with an empty value.

  ExtraKernelPackages:
    <PACKAGE_NAME>: {}
ExtraSysctlSettings

Hash of sysctl settings to apply. Set the value of each parameter using the value key.

  ExtraSysctlSettings:
    <KERNEL_PARAMETER>:
      value: <VALUE>

This example shows the syntax of these parameters in an environment file:

parameter_defaults:
  ExtraKernelModules:
    iscsi_target_mod: {}
  ExtraKernelPackages:
    iscsi-initiator-utils: {}
  ExtraSysctlSettings:
    dev.scsi.logging_level:
      value: 1

25.2. Configuring External Load Balancing

An Overcloud uses multiple Controllers together as a high availability cluster, which ensures maximum operational performance for your OpenStack services. In addition, the cluster provides load balancing for access to the OpenStack services, which evenly distributes traffic to the Controller nodes and reduces server overload for each node. It is also possible to use an external load balancer to perform this distribution. For example, an organization might use their own hardware-based load balancer to handle traffic distribution to the Controller nodes.

For more information about configuring external load balancing, see the dedicated External Load Balancing for the Overcloud guide for full instructions.

25.3. Configuring IPv6 Networking

As a default, the Overcloud uses Internet Protocol version 4 (IPv4) to configure the service endpoints. However, the Overcloud also supports Internet Protocol version 6 (IPv6) endpoints, which is useful for organizations that support IPv6 infrastructure. The director includes a set of environment files to help with creating IPv6-based Overclouds.

For more information about configuring IPv6 in the Overcloud, see the dedicated IPv6 Networking for the Overcloud guide for full instructions.