Pod Warnings Check

Pod warnings check checks for warnings in the pod events.

Infrastructure type

• Kubernetes

Use cases

Pod Warnings Check probe helps you:

• Monitor pod health indicators during chaos experiments

• Detect configuration issues during experiments

• Validate application behavior under stress

• Identify potential problems before they become critical

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Overview

This probe checks for warning events in pod event logs. It's useful for detecting issues like image pull errors, scheduling problems, resource constraints, and other warnings that might indicate problems during chaos experiments.

Probe type

Command Probe

Prerequisites

• Kubernetes cluster with chaos infrastructure installed

• Access to target namespace and pods

• Sufficient RBAC permissions to query pod events

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Probe properties

Command

healthchecks -name validate-pod-failure

Comparator

Type	Criteria	Value
string	contains	[Pass]

The probe passes when the command output contains [Pass], indicating no warning events were found in the pod logs.

Environment variables

Variable	Description	Required	Default
TARGET_LABELS	Comma-separated list of target labels to filter pods.	No	-
TARGET_NAMES	Comma-separated list of target pod names.	No	-
TARGET_NAMESPACE	Namespace of the target pods.	No	-
TARGET_KIND	Kind of the target resource (e.g., deployment, statefulset, daemonset).	No	deployment
STATUS_CHECK_TIMEOUT	Maximum time in seconds to wait for status check.	No	180
STATUS_CHECK_DELAY	Delay in seconds between status checks.	No	2

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Run properties

Property	Description	Type	Default
timeout	Maximum time to wait for the probe to complete (e.g., 30s, 1m, 5m)	String	180s
interval	Time between probe executions (e.g., 1s, 5s, 10s)	String	1s
attempt	Number of retry attempts before marking the probe as failed	Integer	1
pollingInterval	Time between retry attempts (e.g., 1s, 5s, 10s)	String	-
initialDelay	Initial delay before starting the probe (e.g., 0s, 10s, 30s)	String	-
stopOnFailure	Stop the experiment if the probe fails	Boolean	false
verbosity	Log verbosity level (info, debug, trace)	String	-

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Probe definition

You can define this probe in your chaos experiment as follows:

Using pod labels

probe:
  - name: "pod-warnings-validation"
    type: "cmdProbe"
    mode: "Continuous"
    cmdProbe/inputs:
      command: "healthchecks -name validate-pod-failure"
      comparator:
        type: "string"
        criteria: "contains"
        value: "[Pass]"
      env:
        - name: TARGET_LABELS
          value: "app=nginx"
        - name: TARGET_NAMESPACE
          value: "production"
        - name: STATUS_CHECK_TIMEOUT
          value: "180"
        - name: STATUS_CHECK_DELAY
          value: "2"
    runProperties:
      timeout: 180s
      interval: 1s
      attempt: 1
      stopOnFailure: false

Using pod names

probe:
  - name: "specific-pod-warnings-check"
    type: "cmdProbe"
    mode: "Edge"
    cmdProbe/inputs:
      command: "healthchecks -name validate-pod-failure"
      comparator:
        type: "string"
        criteria: "contains"
        value: "[Pass]"
      env:
        - name: TARGET_NAMES
          value: "my-app-pod"
        - name: TARGET_NAMESPACE
          value: "default"
        - name: STATUS_CHECK_TIMEOUT
          value: "120"
    runProperties:
      timeout: 150s
      interval: 2s
      attempt: 3