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Manage node-level tuning by orchestrating the tuned daemon.
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Fix Operator status condition reporting.
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version First functional PoC using operator-sdk. Oct 1, 2018
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OWNERS First functional PoC using operator-sdk. Oct 1, 2018 Adding support for tuned "modules" and "scheduler" plugins. Jan 8, 2019

Cluster Node Tuning Operator

The Cluster Node Tuning Operator manages cluster node-level tuning for OpenShift.

The majority of high-performance applications require some level of kernel tuning. The operator provides a unified management interface to users of node-level sysctls and more flexibility to add custom tuning specified by user needs. The operator manages the containerized tuned daemon for OpenShift as a Kubernetes DaemonSet. It ensures custom tuning specification is passed to all containerized tuned daemons running in the cluster in the format that the daemons understand. The daemons run on all nodes in the cluster, one per node.

Deploying the node tuning operator

The operator is deployed by applying the *.yaml manifests in the operator's /manifests directory in alphanumeric order. It automatically creates a default deployment and custom resource (CR) for the tuned daemons. The following shows the default CR created by the operator on a cluster with the operator installed.

$ oc get Tuned
default   1h

Custom tuning specification

For an example of a tuning specification, refer to /assets/tuned/07-cr-tuned.yaml in the operator's directory or to the resource created in a live cluster by:

$ oc get Tuned/default -o yaml

The CR for the operator has two major sections. The first section, profile:, is a list of tuned profiles and their names. The second, recommend:, defines the profile selection logic.

Multiple custom tuning specifications can co-exist as multiple CRs in the operator's namespace. The existence of new CRs or the deletion of old CRs is detected by the operator. All existing custom tuning specifications are merged and appropriate objects for the containerized tuned daemons are updated.

Profile data

The profile: section lists tuned profiles and their names.

  - name: tuned_profile_1
    data: |
      # Tuned profile specification
      summary=Description of tuned_profile_1 profile

      # ... other sysctl's or other tuned daemon plugins supported by the containerized tuned

  # ...

  - name: tuned_profile_n
    data: |
      # Tuned profile specification
      summary=Description of tuned_profile_n profile

      # tuned_profile_n profile settings

Refer to a list of (tuned plugins supported by the operator)[#supported-tuned-daemon-plugins].

Recommended profiles

The profile: selection logic is defined by the recommend: section of the CR.

  - match:                              # optional; if omitted, profile match is assumed unless a profile with a higher matches first
    <match>                             # an optional array
    priority: <priority>                # profile ordering priority, lower numbers mean higher priority (0 is the highest priority)
    profile: <tuned_profile_name>       # e.g. tuned_profile_1

  # ...

  - match:
    priority: <priority>
    profile: <tuned_profile_name>       # e.g. tuned_profile_n

If <match> is omitted, a profile match (i.e. true) is assumed.

<match> is an optional array recursively defined as follows:

    - label: <label_name>     # node or pod label name
      value: <label_value>    # optional node or pod label value; if omitted, the presence of <label_name> is enough to match
      type: <label_type>      # optional node or pod type ("node" or "pod"); if omitted, "node" is assumed
      <match>                 # an optional <match> array

If <match> is not omitted, all nested <match> sections must also evaluate to true. Otherwise, false is assumed and the profile with the respective <match> section will not be applied or recommended. Therefore, the nesting (child <match> sections) works as logical and operator. Conversely, if any item of the <match> array matches, the entire <match> array evaluates to true. Therefore, the array acts as logical or operator.


  - match:
    - label:
      - label:
      - label:
      type: pod
    priority: 10
    profile: openshift-control-plane-es
  - match:
    - label:
    - label:
    priority: 20
    profile: openshift-control-plane
  - priority: 30
    profile: openshift-node

The CR above is translated for the containerized tuned daemon into its recommend.conf file based on the profile priorities. The profile with the highest priority (10) is openshift-control-plane-es and, therefore, it is considered first. The containerized tuned daemon running on a given node looks to see if there is a pod running on the same node with the label set. If not, the entire <match> section evaluates as false. If there is such a pod with the label, in order for the <match> section to evaluate to true, the node label also needs to be or

If the labels for the profile with priority 10 matched, openshift-control-plane-es profile is applied and no other profile is considered. If the node/pod label combination did not match, the second highest priority profile (openshift-control-plane) is considered. This profile is applied if the containerized tuned pod runs on a node with labels or

Finally, the profile openshift-node has the lowest priority of 30. It lacks the <match> section and, therefore, will always match. It acts as a profile catch-all to set openshift-node profile, if no other profile with higher priority matches on a given node.

Supported tuned daemon plugins

Aside from the [main] section, the following tuned plugins are supported when using custom profiles defined in the profile: section of the Tuned CR:

  • audio
  • cpu
  • disk
  • eeepc_she
  • modules
  • mounts
  • net
  • scheduler
  • scsi_host
  • selinux
  • sysctl
  • sysfs
  • usb
  • video
  • vm

with the exception of dynamic tuning functionality provided by some of the plugins.

The following Tuned plugins are currently not supported:

  • bootloader
  • script
  • systemd
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