Add helm chart configuration to add init containers to the node daemonset

[clbx]

Is this a bug fix or adding new feature?
Adding a new feature

What is this PR about? / Why do we need it?
Adds the ability to add init containers to the node daemonset with the helm chart.

The controller has this configuration. We have a use case where we would like to use an init container on the node to set the hop limit on each node in our cluster that uses the csi driver.

What testing is done?
I was only able to test this on a Linux cluster, I do not have any windows nodes.

Using the following values file

node:
  initContainers:
  - name: wait
    image: busybox
    command: ['sh', '-c', "sleep 20"]

Generates the following manifest for the node-daemonset

# Source: aws-ebs-csi-driver/templates/node.yaml
kind: DaemonSet
apiVersion: apps/v1
metadata:
  name: ebs-csi-node
  namespace: default
  labels:
    app.kubernetes.io/name: aws-ebs-csi-driver
    app.kubernetes.io/instance: release-name
    helm.sh/chart: aws-ebs-csi-driver-2.36.0
    app.kubernetes.io/version: "1.36.0"
    app.kubernetes.io/component: csi-driver
    app.kubernetes.io/managed-by: Helm
spec:
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: ebs-csi-node
      app.kubernetes.io/name: aws-ebs-csi-driver
      app.kubernetes.io/instance: release-name
  updateStrategy:
    rollingUpdate:
      maxUnavailable: 10%
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: ebs-csi-node
        app.kubernetes.io/name: aws-ebs-csi-driver
        app.kubernetes.io/instance: release-name
        helm.sh/chart: aws-ebs-csi-driver-2.36.0
        app.kubernetes.io/version: "1.36.0"
        app.kubernetes.io/component: csi-driver
        app.kubernetes.io/managed-by: Helm
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: eks.amazonaws.com/compute-type
                operator: NotIn
                values:
                - fargate
              - key: node.kubernetes.io/instance-type
                operator: NotIn
                values:
                - a1.medium
                - a1.large
                - a1.xlarge
                - a1.2xlarge
                - a1.4xlarge
      nodeSelector:
        kubernetes.io/os: linux
      serviceAccountName: ebs-csi-node-sa
      terminationGracePeriodSeconds: 30
      priorityClassName: system-node-critical
      tolerations:
        - operator: Exists
      hostNetwork: false
      securityContext:
        fsGroup: 0
        runAsGroup: 0
        runAsNonRoot: false
        runAsUser: 0
      initContainers:
        - command:
          - sh
          - -c
          - sleep 20
          image: busybox
          name: wait
      containers:
        - name: ebs-plugin
          image: public.ecr.aws/ebs-csi-driver/aws-ebs-csi-driver:v1.36.0
          imagePullPolicy: IfNotPresent
          args:
            - node
            - --endpoint=$(CSI_ENDPOINT)
            - --logging-format=text
            - --v=2
          env:
            - name: CSI_ENDPOINT
              value: unix:/csi/csi.sock
            - name: CSI_NODE_NAME
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
          volumeMounts:
            - name: kubelet-dir
              mountPath: /var/lib/kubelet
              mountPropagation: "Bidirectional"
            - name: plugin-dir
              mountPath: /csi
            - name: device-dir
              mountPath: /dev
          ports:
            - name: healthz
              containerPort: 9808
              protocol: TCP
          livenessProbe:
            httpGet:
              path: /healthz
              port: healthz
            initialDelaySeconds: 10
            timeoutSeconds: 3
            periodSeconds: 10
            failureThreshold: 5
          resources:
            limits:
              memory: 256Mi
            requests:
              cpu: 10m
              memory: 40Mi
          securityContext:
            privileged: true
            readOnlyRootFilesystem: true
          lifecycle:
            preStop:
              exec:
                command: ["/bin/aws-ebs-csi-driver", "pre-stop-hook"]
        - name: node-driver-registrar
          image: public.ecr.aws/eks-distro/kubernetes-csi/node-driver-registrar:v2.12.0-eks-1-31-5
          imagePullPolicy: IfNotPresent
          args:
            - --csi-address=$(ADDRESS)
            - --kubelet-registration-path=$(DRIVER_REG_SOCK_PATH)
            - --v=2
          env:
            - name: ADDRESS
              value: /csi/csi.sock
            - name: DRIVER_REG_SOCK_PATH
              value: /var/lib/kubelet/plugins/ebs.csi.aws.com/csi.sock
          livenessProbe:
            exec:
              command:
              - /csi-node-driver-registrar
              - --kubelet-registration-path=$(DRIVER_REG_SOCK_PATH)
              - --mode=kubelet-registration-probe
            initialDelaySeconds: 30
            periodSeconds: 90
            timeoutSeconds: 15
          volumeMounts:
            - name: plugin-dir
              mountPath: /csi
            - name: registration-dir
              mountPath: /registration
            - name: probe-dir
              mountPath: /var/lib/kubelet/plugins/ebs.csi.aws.com/
          resources:
            limits:
              memory: 256Mi
            requests:
              cpu: 10m
              memory: 40Mi
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
        - name: liveness-probe
          image: public.ecr.aws/eks-distro/kubernetes-csi/livenessprobe:v2.14.0-eks-1-31-5
          imagePullPolicy: IfNotPresent
          args:
            - --csi-address=/csi/csi.sock
          volumeMounts:
            - name: plugin-dir
              mountPath: /csi
          resources:
            limits:
              memory: 256Mi
            requests:
              cpu: 10m
              memory: 40Mi
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
      volumes:
        - name: kubelet-dir
          hostPath:
            path: /var/lib/kubelet
            type: Directory
        - name: plugin-dir
          hostPath:
            path: /var/lib/kubelet/plugins/ebs.csi.aws.com/
            type: DirectoryOrCreate
        - name: registration-dir
          hostPath:
            path: /var/lib/kubelet/plugins_registry/
            type: Directory
        - name: device-dir
          hostPath:
            path: /dev
            type: Directory
        - name: probe-dir
          emptyDir: {}

Which when deployed creates a daemonset with a busybox init container.

Solves #2214

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[k8s-ci-robot]

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[torredil]

/ok-to-test

[torredil]

/lgtm

[ConnorJC3]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ConnorJC3

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[ConnorJC3]

/retest
Likely flake

[github-actions]

Code Coverage Diff

File	Old Coverage	New Coverage	Delta
github.com/kubernetes-sigs/aws-ebs-csi-driver/pkg/metrics/metrics.go	63.8%	66.7%	2.9

[clbx]

What’s the release cadence on the helm chart? We have an immediate need for this change if it’s possible to cut a release sooner rather than later.

[torredil]

Hi @clbx, this change has been released and is now available: https://github.com/kubernetes-sigs/aws-ebs-csi-driver/releases/tag/helm-chart-aws-ebs-csi-driver-2.37.0.