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Sysctl

The sysctl collector reads kernel parameter settings from /proc/sys/net/ipv4, /proc/sys/net/bridge, and /proc/sys/vm on all nodes. This collector schedules a pod on every node using the specified image.

Parameters​

In addition to the shared collector properties, the sysctl collector accepts the following parameters:

namespace (Optional)​

The namespace where the pods will be created. If not specified, the namespace that is currently set for the kubectl context is used.

image (Required)​

The image to use for the pods scheduled on each node. This image should be accessible to the nodes in the cluster. The image must have a shell with the find, cat, and echo commands available.

timeout (Optional)​

A duration that will be honored when collecting data. The timer should allow enough time to pull images if needed. Default: 1 minute

imagePullPolicy (Optional)​

A valid, string representation of the policy to use when pulling the image. Default: IfNotPresent

imagePullSecret (Optional)​

The same image pull secret options available to the copyFromHost collector are supported for the sysctl collector.

Example Collector Definition​

apiVersion: troubleshoot.sh/v1beta2
kind: SupportBundle
metadata:
  name: sample
spec:
  collectors:
    - sysctl:
        collectorName: "sysctl network parameters"
        image: debian:buster-slim
        namespace: default
        imagePullPolicy: IfNotPresent
        imagePullSecret:
          name: my-temporary-secret
          data:
            .dockerconfigjson: ewoJICJhdXRocyI6IHsKzCQksHR0cHM6Ly9pbmRleC5kb2NrZXIuaW8vdjEvIjoge30KCX0sCgkiSHR0cEhlYWRlcnMiOiB7CgkJIlVzZXItQWdlbnQiOiAiRG9ja2VyLUNsaWVudC8xOS4wMy4xMiAoZGFyd2luKSIKCX0sCgkiY3JlZHNTdG9yZSI6ICJkZXNrdG9wIiwKCSJleHBlcmltZW50YWwiOiAiZGlzYWJsZWQiLAoJInN0YWNrT3JjaGVzdHJhdG9yIjogInN3YXJtIgp9
          type: kubernetes.io/dockerconfigjson

Included resources​

When this collector is executed, it includes the following files in a support bundle:

/sysctl/[node name]​

The sysctl parameters collected for each node are aggregated into a single file with the following format:

/proc/sys/net/ipv4/cipso_cache_bucket_size = 10
/proc/sys/net/ipv4/cipso_cache_enable = 1
/proc/sys/net/ipv4/cipso_rbm_optfmt = 0
...