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7.9. Using sysctls in containers

You can configure namespaced sysctls to manage kernel parameters for specific pods or network interfaces. By enabling safe or unsafe namespaced sysctls, you can fine-tune your environment’s performance and networking behavior at the pod level.

Only sysctls that are namespaced can be set independently on pods. If a sysctl is not namespaced, it is known as a node-level sysctl. You must use another method of setting the sysctl, such as by using the Node Tuning Operator. To set node-level sysctls, see "Using the Node Tuning Operator".

Network sysctls are a special category of sysctl. Network sysctls include:

  • System-wide sysctls, for example net.ipv4.ip_local_port_range, that are valid for all networking. You can set these independently for each pod on a node.
  • Interface-specific sysctls, for example net.ipv4.conf.IFNAME.accept_local, that only apply to a specific additional network interface for a given pod. You can set these independently for each additional network configuration. You set these by using a configuration in the tuning-cni after the network interfaces are created.
重要

If the net.ipv4.ip_local_port_range safe sysctl parameter value and the default node port service range overlap, the OVN Kubernetes plugin might experience connection failures. For more information about this parameter, see the System-wide safe sysctls table in the "Safe and unsafe sysctls" section.

Only those sysctls considered safe are enabled by default. A cluster administrator can manually enable unsafe sysctls on the node to be available to the user.

7.9.1. About sysctls
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The Linux sysctl interface allows you to modify kernel parameters at runtime to manage subsystems such as networking, virtual memory, and MDADM. By accessing the sysctl interface, you can view and adjust system configurations without rebooting the operating system.

You can modify the following subsystems by using sysctls:

  • kernel (common prefix: kernel.)
  • networking (common prefix: net.)
  • virtual memory (common prefix: vm.)
  • MDADM (common prefix: dev.)

Refer to the Kernel.org documentation for more information on the subsystems you can manage. You can get a list of all parameters by running the following command: 

$ sudo sysctl -a
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