kured/charts/kured/README.md

Kured (KUbernetes REboot Daemon)

Introduction

This chart installs the "Kubernetes Reboot Daemon" using the Helm Package Manager.

Prerequisites

• Kubernetes 1.9+

Installing the Chart

To install the chart with the release name my-release:

$ helm repo add kured https://weaveworks.github.io/kured
$ helm install my-release kured/kured

Uninstalling the Chart

To uninstall/delete the my-release deployment:

$ helm delete my-release

The command removes all the Kubernetes components associated with the chart and deletes the release.

Migrate from stable Helm-Chart

The following changes have been made compared to the stable chart:

• [BREAKING CHANGE] The autolock feature was removed. Use configuration.startTime and configuration.endTime instead.
• Role inconsistencies have been fixed (allowed verbs for modifying the DaemonSet, apiGroup of PodSecurityPolicy)
• Added support for affinities.
• Configuration of cli-flags can be made through a configuration object.
• Added optional Service and ServiceMonitor support for metrics endpoint.

Configuration

Config	Description	Default
image.repository	Image repository	weaveworks/kured
image.tag	Image tag	1.6.1
image.pullPolicy	Image pull policy	IfNotPresent
image.pullSecrets	Image pull secrets	[]
updateStrategy	Daemonset update strategy	OnDelete
maxUnavailable	The max pods unavailable during a rolling update	1
podAnnotations	Annotations to apply to pods (eg to add Prometheus annotations)	{}
extraArgs	Extra arguments to pass to /usr/bin/kured. See below.	{}
extraEnvVars	Array of environment variables to pass to the daemonset.	{}
configuration.lockTtl	cli-parameter --lock-ttl	0
configuration.alertFilterRegexp	cli-parameter --alert-filter-regexp	""
configuration.blockingPodSelector	Array of selectors for multiple cli-parameters --blocking-pod-selector	[]
configuration.endTime	cli-parameter --end-time	""
configuration.lockAnnotation	cli-parameter --lock-annotation	""
configuration.period	cli-parameter --period	""
configuration.prometheusUrl	cli-parameter --prometheus-url	""
configuration.rebootDays	Array of days for multiple cli-parameters --reboot-days	[]
configuration.rebootSentinel	cli-parameter --reboot-sentinel	""
configuration.slackChannel	cli-parameter --slack-channel	""
configuration.slackHookUrl	cli-parameter --slack-hook-url	""
configuration.slackUsername	cli-parameter --slack-username	""
configuration.messageTemplateDrain	cli-parameter --message-template-drain	""
configuration.messageTemplateReboot	cli-parameter --message-template-reboot	""
configuration.startTime	cli-parameter --start-time	""
configuration.timeZone	cli-parameter --time-zone	""
rbac.create	Create RBAC roles	true
serviceAccount.create	Create a service account	true
serviceAccount.name	Service account name to create (or use if serviceAccount.create is false)	(chart fullname)
podSecurityPolicy.create	Create podSecurityPolicy	false
resources	Resources requests and limits.	{}
metrics.create	Create a ServiceMonitor for prometheus-operator	false
metrics.namespace	The namespace to create the ServiceMonitor in	""
metrics.labels	Additional labels for the ServiceMonitor	{}
metrics.interval	Interval prometheus should scrape the endpoint	60s
metrics.scrapeTimeout	A custom scrapeTimeout for prometheus	""
service.create	Create a Service for the metrics endpoint	false
service.name	Service name for the metrics endpoint	""
service.port	Port of the service to expose	8080
service.annotations	Annotations to apply to the service (eg to add Prometheus annotations)	{}
priorityClassName	Priority Class to be used by the pods	""
tolerations	Tolerations to apply to the daemonset (eg to allow running on master)	[{"key": "node-role.kubernetes.io/master", "effect": "NoSchedule"}]
affinity	Affinity for the daemonset (ie, restrict which nodes kured runs on)	{}
nodeSelector	Node Selector for the daemonset (ie, restrict which nodes kured runs on)	{}

See https://github.com/weaveworks/kured#configuration for values (not contained in the configuration object) for extraArgs. Note that

extraArgs:
  foo: 1
  bar-baz: 2

becomes /usr/bin/kured ... --foo=1 --bar-baz=2.

Prometheus Metrics

Kured exposes a single prometheus metric indicating whether a reboot is required or not (see kured docs) for details.

Prometheus-Operator

metrics:
  create: true

Prometheus Annotations

service:
  annotations:
    prometheus.io/scrape: "true"
    prometheus.io/path: "/metrics"
    prometheus.io/port: "8080"