OpenShift: Hvordan øke nettverksringbufferstørrelsen på arbeidsnoder for kontrollplanet

Summary: Denne artikkelen beskriver fremgangsmåten for å øke RX-ringbufferne på grensesnittene til hver arbeidsnode i en OpenShift Container Platform (OCP) Hosted Control Plane (HCP)-klynge.

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Instructions

Forberedelse

 I eksemplene nedenfor har vi identifisert to grensesnitt som må modifiseres av RX-bufferne. 

 

eno12399np0
ens1f1np1

Vi har kontrollert de gyldige verdiene for ringbuffere på nettverkskortene ved hjelp av ethtool -g Kommandoen. Dette kan gjøres fra en feilsøkingspod på noden eller ekstraheres fra en SOS-pakke. 

 

# oc debug node/samplenode

# chroot /host

# ethtool -g eno12399np0
Ring parameters for eno12399np0:
Pre-set maximums:
RX:             8192
RX Mini:        n/a
RX Jumbo:       n/a
TX:             8192
Current hardware settings:
RX:             4096
RX Mini:        n/a
RX Jumbo:       n/a
TX:             1024
RX Buf Len:     n/a
CQE Size:       n/a
TX Push:        off
TCP data split: off

Vi har bestemt oss for 4096 for verdien for å sette ringbufferne. 

Vi utfører følgende trinn for å fullføre operasjonen.

  1. Opprett Butane Filer. 
  2. Konverter disse Butane-filene til YAML. 
  3. Bygg inn de genererte YAML til en configmap Objekt. 
  4. Opprett ikonet configmaps. 
  5.  Rediger ikonet nodepool objekt for å referere til configmaps Opprettet. 
  6. Vent til konfigurasjonsoppdateringen er fullført. 
  7. Kontroller at konfigurasjonsoppdateringen er fullført, og at endringene er implementert.  

 

Forbered Butane-filer.

Opprett to Butane filer, en for hvert grensesnitt.

# eno12399np0.bu
variant: openshift
version: 4.18.0
metadata:
  name: 99-worker-ethtool-eno12399np0-buffer
  labels:
    machineconfiguration.openshift.io/role: worker
storage:
  files:
  - path: /etc/systemd/system/set-ethtool-eno12399np0-buffer.service
    mode: 0644
    overwrite: true
    contents:
      inline: |
        [Unit]
        Description=Set ethtool RX buffer size for network interface
        Requires=NetworkManager.service
        After=NetworkManager.service
        Before=ovs-configuration.service
        DefaultDependencies=no
        [Service]
        Type=oneshot
        ExecStart=/bin/bash -c "/sbin/ethtool -G eno12399np0 rx 4096 >> /var/log/user-data.log 2>&1"
        [Install]
        WantedBy=multi-user.target
systemd:
  units:
  - name: set-ethtool-eno12399np0-buffer.service
    enabled: true

# ens1f1np1.bu
variant: openshift
version: 4.18.0
metadata:
  name: 99-worker-ethtool-ens1f1np1-buffer
  labels:
    machineconfiguration.openshift.io/role: worker
storage:
  files:
  - path: /etc/systemd/system/set-ethtool-ens1f1np1-buffer.service
    mode: 0644
    overwrite: true
    contents:
      inline: |
        [Unit]
        Description=Set ethtool RX buffer size for network interface
        Requires=NetworkManager.service
        After=NetworkManager.service
        Before=ovs-configuration.service
        DefaultDependencies=no
        [Service]
        Type=oneshot
        ExecStart=/bin/bash -c "/sbin/ethtool -G ens1f1np1 rx 4096 >> /var/log/user-data.log 2>&1"
        [Install]
        WantedBy=multi-user.target
systemd:
  units:
  - name: set-ethtool-ens1f1np1-buffer.service
    enabled: true

Konvertere Butane filer til MachineConfig YAML

Last ned den kjørbare Butan-filen og kjør konverteringen.

# Download butane (example)
$ curl -L -o butane https://mirror.openshift.com/pub/openshift-v4/clients/butane/butane-linux-amd64
$ chmod +x butane

# Convert
$ ./butane eno12399np0.bu -o eno12399np0.yaml
$ ./butane ens1f1np1.bu -o ens1f1np1.yaml

Opprett ConfigMap Objekter.

Pakk inn hver generert YAML i en ConfigMap Navngitt mc-worker-ethtool- -buffer i den clusters Navneområdet.

# mc-worker-ethtool-eno12399np0-buffer.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: mc-worker-ethtool-eno12399np0-buffer
  namespace: clusters
data:
  config: |
    apiVersion: machineconfiguration.openshift.io/v1
    kind: MachineConfig
    metadata:
      labels:
        machineconfiguration.openshift.io/role: worker
      name: 99-worker-ethtool-eno12399np0-buffer
    spec:
      config:
        ignition:
          version: 3.4.0
        storage:
          files:
          - contents:
              compression: gzip
              source: data:;base64,[BASE64_CONTENT]
            mode: 420
            overwrite: true
            path: /etc/systemd/system/set-ethtool-eno12399np0-buffer.service
        systemd:
          units:
          - name: set-ethtool-eno12399np0-buffer.service
            enabled: true

# mc-worker-ethtool-ens1f1np1-buffer.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: mc-worker-ethtool-ens1f1np1-buffer
  namespace: clusters
data:
  config: |
    apiVersion: machineconfiguration.openshift.io/v1
    kind: MachineConfig
    metadata:
      labels:
        machineconfiguration.openshift.io/role: worker
      name: 99-worker-ethtool-ens1f1np1-buffer
    spec:
      config:
        ignition:
          version: 3.4.0
        storage:
          files:
          - contents:
              compression: gzip
              source: data:;base64,[BASE64_CONTENT]
            mode: 420
            overwrite: true
            path: /etc/systemd/system/set-ethtool-ens1f1np1-buffer.service
        systemd:
          units:
          - name: set-ethtool-ens1f1np1-buffer.service
            enabled: true

Bruke ConfigMaps til klyngen.

$ oc apply -f mc-worker-ethtool-eno12399np0-buffer.yaml
$ oc apply -f mc-worker-ethtool-ens1f1np1-buffer.yaml

Knytte ConfigMaps til nodeutvalget.

Rediger nodeutvalget, og legg til ConfigMap Navn under spec.config 

$ oc edit nodepool [NODEPOOL_NAME] -n clusters

Sett inn følgende linjer i spec Delen:

spec:
  config:
  - name: mc-worker-ethtool-eno12399np0-buffer
  - name: mc-worker-ethtool-ens1f1np1-buffer

Bekreft node‑pool Oppdateringen.

$ oc get nodepool -n clusters

Bekreft at UPDATINGCONFIG Viser True og at versjonen samsvarer med klyngeversjonen.

Kontroller tjenestestatusen på hver arbeidsnode.

for i in $(oc get nodes -l node-role.kubernetes.io/worker= --no-headers | awk '{print $1}'); do
  oc debug node/$i -- chroot /host systemctl status set-ethtool-eno12399np0-buffer.service;
done

for i in $(oc get nodes -l node-role.kubernetes.io/worker= --no-headers | awk '{print $1}'); do
  oc debug node/$i -- chroot /host systemctl status set-ethtool-ens1f1np1-buffer.service;
done

Validere innstillinger for ringbuffer

for i in $(oc get nodes -l node-role.kubernetes.io/worker= --no-headers | awk '{print $1}'); do
  oc debug node/$i -- chroot /host ethtool -g eno12399np0;
done

for i in $(oc get nodes -l node-role.kubernetes.io/worker= --no-headers | awk '{print $1}'); do
  oc debug node/$i -- chroot /host ethtool -g ens1f1np1;
done

Affected Products

APEX, APEX Cloud Platform for Red Hat OpenShift
Article Properties
Article Number: 000428878
Article Type: How To
Last Modified: 17 فبراير 2026
Version:  1
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