Add k8s-daemonset helm-chart - inital cut

charts/k8s-daemonset/.helmignore

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+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*.orig
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/

charts/k8s-daemonset/Chart.yaml

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+apiVersion: v2
+name: k8s-service
+description: A Helm chart for Kubernetes
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "1.16.0"

charts/k8s-daemonset/README.md

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+# Kubernetes DaemonSet Helm Chart
+
+This Helm Chart can be used to deploy your application container under a
+[DaemonSet](https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/) resource onto your Kubernetes
+cluster. You can use this Helm Chart to run and deploy a long-running container, such as a web service or backend
+microservice. The container will be packaged into
+[Pods](https://kubernetes.io/docs/concepts/workloads/pods/pod-overview/) that are managed by the `DaemonSet`
+controller.
+
+This Helm Chart can be used to deploy the pod under a `DaemonSet` resource onto your Kubernetes cluster.
+
+
+## How to use this chart?
+
+* See the [root README](/README.adoc) for general instructions on using Gruntwork Helm Charts.
+* See the [examples](/examples) folder for example usage.
+* See the provided [values.yaml](./values.yaml) file for the required and optional configuration values that you can set
+  on this chart.
+
+back to [root README](/README.adoc#core-concepts)
+
+## What resources does this Helm Chart deploy?
+
+The following resources will be deployed with this Helm Chart, depending on which configuration values you use:
+
+- `DaemonSet`: The main `DaemonSet` controller that will manage the application container image specified in the
+                `containerImage` input value.
+
+
+back to [root README](/README.adoc#core-concepts)
+
+
+## Useful helm commands:
+	1. List helm charts 
+
+  ```bash
+
+  helm list
+
+  NAME                    NAMESPACE       REVISION        UPDATED                                 STATUS          CHART                   APP VERSION
+  my-daemonset-chart      default         1               2022-04-27 17:52:38.166977136 +0000 UTC deployed        k8s-service-0.1.0       1.16.0
+
+  ```
+
+	2. List daemonsets and pods
+
+  ```bash
+
+    # List Daemonsets
+    kubectl get daemonset
+    NAME      DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR   AGE
+    fluentd   1         1         1       1            1           <none>          2m45s
+
+    # List pods
+    kubectl get pods
+    NAME            READY   STATUS    RESTARTS   AGE
+    fluentd-l9g2s   1/1     Running   0          3m14s
+  ```
+
+
+back to [root README](/README.adoc#day-to-day-operations)

charts/k8s-daemonset/templates/daemonset.yaml

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+{{- if .Values.DaemonSet.create }}
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: {{ .Values.DaemonSet.name }}
+  namespace: {{ $.Release.Namespace }}
+  labels:
+    app: {{ .Values.DaemonSet.name }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version }}
+    release: {{ .Release.Name }}
+spec:
+  selector:
+    matchLabels:
+      app: {{ .Values.DaemonSet.name }}
+      release: {{ .Release.Name }}
+  updateStrategy:
+    {{- if eq .Values.DaemonSet.updateStrategy "RollingUpdate" }}
+    rollingUpdate:
+      maxUnavailable: {{ .Values.DaemonSet.maxUnavailable }}
+    {{- end }}
+  template:
+    metadata:
+      labels:
+        app: {{ .Values.DaemonSet.name }}
+        release: {{ .Release.Name }}
+    spec:
+      tolerations:
+        - key: {{ .Values.DaemonSet.tolerationKey }}
+          operator: {{ .Values.DaemonSet.tolerationOperator }}
+          effect: {{ .Values.DaemonSet.tolerationEffect }}
+      containers:
+      - name: {{ .Values.DaemonSet.name }}
+        image: {{ .Values.DaemonSet.containerImage }}
+      {{- if .Values.DaemonSet.volumeMountCreate }}
+        volumeMounts:
+        - name: {{ .Values.DaemonSet.volumeName }}
+          mountPath: {{ .Values.DaemonSet.volumeMountPath }}
+      {{- if .Values.DaemonSet.extraVolumeMountCreate }}
+        - name: {{ .Values.DaemonSet.extraVolumeName }}
+          mountPath: {{ .Values.DaemonSet.extraVolumeMountPath }}
+          readOnly: true
+      {{- end }}
+      volumes:
+      - name: {{ .Values.DaemonSet.volumeName }}
+        hostPath:
+          path: {{ .Values.DaemonSet.volumeMountPath }}
+      {{- end }}
+      {{- if .Values.DaemonSet.extraVolumeMountCreate }}
+      - name: {{ .Values.DaemonSet.extraVolumeName }}
+        hostPath:
+          path: {{ .Values.DaemonSet.extraVolumeMountPath }}
+      {{- end }}
+{{- end }}
+

charts/k8s-daemonset/values.yaml

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+# DaemonSet is a map that configures the pods to run as daemon on all (or some) Nodes.
+# The expected keys of DaemonSet are:
+#   - name                         (string) : The name of the DaemonSet.
+#   - create                       (bool)   : Whether or not to create a DaemonSet with the desired name
+#   - labels                       (map)    : Labels will add the provided map to the DaemonSet created
+#   - selectorLabels               (map)    : Tells the resource to match the pod, according to that label
+#   - tolerationKey                (string) : Toleration Key, Example: node-role.kubernetes.io/master
+#   - tolerationOperator           (string) : Toleration Operator, Example: Exists
+#   - tolerationEffect             (string) : Toleration Key, Example: NoSchedule
+#   - volumeName                   (string) : Name of the volumes mount inside container
+#   - volumeMountPath              (string) : Path name to Mount volumes into container
+#   - updateStrategy               (string) : Type of deployment
+#   - maxUnavailable               (number) : Only used when updateStrategy is set to "RollingUpdate"
+
+DaemonSet:
+  name: "fluentd"
+  create: true
+  tolerationKey: "node-role.kubernetes.io/master"
+  tolerationOperator: "Exists"
+  tolerationEffect: "NoSchedule"
+  containerImage: "quay.io/fluentd_elasticsearch/fluentd:v2.5.2"
+  volumeMountCreate: true
+  volumeName: "varlog"
+  volumeMountPath: "/var/log"
+  updateStrategy: "RollingUpdate"
+  maxUnavailable: 1
+  extraVolumeMountCreate: true
+  extraVolumeName: "varlibdockercontainers"
+  extraVolumeMountPath: "/var/lib/docker/containers"