add hostAliases to helm chart

operations/helm/charts/alloy/CHANGELOG.md

@@ -9,6 +9,8 @@ internal API changes are not present.
 
 Unreleased
 ----------
+### Enhancements
+- Add support for adding hostAliases to the Helm chart. (@duncan485)
 
 0.9.2 (2024-10-18)
 ------------------

operations/helm/charts/alloy/README.md

@@ -45,6 +45,7 @@ useful if just using the default DaemonSet isn't sufficient.
 | alloy.extraArgs | list | `[]` | Extra args to pass to `alloy run`: https://grafana.com/docs/alloy/latest/reference/cli/run/ |
 | alloy.extraEnv | list | `[]` | Extra environment variables to pass to the Alloy container. |
 | alloy.extraPorts | list | `[]` | Extra ports to expose on the Alloy container. |
+| alloy.hostAliases | list | `[]` | Host aliases to add to the Alloy container. |
 | alloy.lifecycle | object | `{}` | Set lifecycle hooks for the Grafana Alloy container. |
 | alloy.listenAddr | string | `"0.0.0.0"` | Address to listen for traffic on. 0.0.0.0 exposes the UI to other containers. |
 | alloy.listenPort | int | `12345` | Port to listen for traffic on. |

operations/helm/charts/alloy/ci/host-alias-values.yaml

@@ -0,0 +1,5 @@
+alloy:
+  hostAliases:
+    - ip: "20.21.22.23"
+      hostnames:
+        - "grafana.company.net"

operations/helm/charts/alloy/templates/controllers/_pod.yaml

@@ -83,4 +83,8 @@ spec:
     {{- if .Values.controller.volumes.extra }}
     {{- toYaml .Values.controller.volumes.extra | nindent 4 }}
     {{- end }}
+  {{- if $values.hostAliases }}
+  hostAliases:
+    {{- toYaml $values.hostAliases | nindent 4 }}
+  {{- end }}
 {{- end }}

operations/helm/charts/alloy/values.yaml

@@ -89,6 +89,12 @@ alloy:
   #   protocol: "TCP"
   #   appProtocol: "h2c"
 
+  # -- Host aliases to add to the Alloy container.
+  hostAliases: []
+  # - ip: "20.21.22.23"
+  #   hostnames:
+  #     - "company.grafana.net"
+
   mounts:
     # -- Mount /var/log from the host into the container for log collection.
     varlog: false

operations/helm/tests/host-alias/alloy/templates/configmap.yaml

@@ -0,0 +1,43 @@
+---
+# Source: alloy/templates/configmap.yaml
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: alloy
+  labels:
+    helm.sh/chart: alloy
+    app.kubernetes.io/name: alloy
+    app.kubernetes.io/instance: alloy
+    app.kubernetes.io/version: "vX.Y.Z"
+    app.kubernetes.io/managed-by: Helm
+    app.kubernetes.io/component: config
+data:
+  config.alloy: |-
+    logging {
+    	level  = "info"
+    	format = "logfmt"
+    }
+
+    discovery.kubernetes "pods" {
+    	role = "pod"
+    }
+
+    discovery.kubernetes "nodes" {
+    	role = "node"
+    }
+
+    discovery.kubernetes "services" {
+    	role = "service"
+    }
+
+    discovery.kubernetes "endpoints" {
+    	role = "endpoints"
+    }
+
+    discovery.kubernetes "endpointslices" {
+    	role = "endpointslice"
+    }
+
+    discovery.kubernetes "ingresses" {
+    	role = "ingress"
+    }

operations/helm/tests/host-alias/alloy/templates/controllers/daemonset.yaml

@@ -0,0 +1,79 @@
+---
+# Source: alloy/templates/controllers/daemonset.yaml
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: alloy
+  labels:
+    helm.sh/chart: alloy
+    app.kubernetes.io/name: alloy
+    app.kubernetes.io/instance: alloy
+    app.kubernetes.io/version: "vX.Y.Z"
+    app.kubernetes.io/managed-by: Helm
+spec:
+  minReadySeconds: 10
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: alloy
+      app.kubernetes.io/instance: alloy
+  template:
+    metadata:
+      annotations:
+        kubectl.kubernetes.io/default-container: alloy
+      labels:
+        app.kubernetes.io/name: alloy
+        app.kubernetes.io/instance: alloy
+    spec:
+      serviceAccountName: alloy
+      containers:
+        - name: alloy
+          image: docker.io/grafana/alloy:v1.4.3
+          imagePullPolicy: IfNotPresent
+          args:
+            - run
+            - /etc/alloy/config.alloy
+            - --storage.path=/tmp/alloy
+            - --server.http.listen-addr=0.0.0.0:12345
+            - --server.http.ui-path-prefix=/
+            - --stability.level=generally-available
+          env:
+            - name: ALLOY_DEPLOY_MODE
+              value: "helm"
+            - name: HOSTNAME
+              valueFrom:
+                fieldRef:
+                  fieldPath: spec.nodeName
+          ports:
+            - containerPort: 12345
+              name: http-metrics
+          readinessProbe:
+            httpGet:
+              path: /-/ready
+              port: 12345
+              scheme: HTTP
+            initialDelaySeconds: 10
+            timeoutSeconds: 1
+          volumeMounts:
+            - name: config
+              mountPath: /etc/alloy
+        - name: config-reloader
+          image: ghcr.io/jimmidyson/configmap-reload:v0.12.0
+          args:
+            - --volume-dir=/etc/alloy
+            - --webhook-url=http://localhost:12345/-/reload
+          volumeMounts:
+            - name: config
+              mountPath: /etc/alloy
+          resources:
+            requests:
+              cpu: 1m
+              memory: 5Mi
+      dnsPolicy: ClusterFirst
+      volumes:
+        - name: config
+          configMap:
+            name: alloy
+      hostAliases:
+        - hostnames:
+          - grafana.company.net
+          ip: 20.21.22.23

operations/helm/tests/host-alias/alloy/templates/rbac.yaml

@@ -0,0 +1,119 @@
+---
+# Source: alloy/templates/rbac.yaml
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: alloy
+  labels:
+    helm.sh/chart: alloy
+    app.kubernetes.io/name: alloy
+    app.kubernetes.io/instance: alloy
+    app.kubernetes.io/version: "vX.Y.Z"
+    app.kubernetes.io/managed-by: Helm
+    app.kubernetes.io/component: rbac
+rules:
+  # Rules which allow discovery.kubernetes to function.
+  - apiGroups:
+      - ""
+      - "discovery.k8s.io"
+      - "networking.k8s.io"
+    resources:
+      - endpoints
+      - endpointslices
+      - ingresses
+      - nodes
+      - nodes/proxy
+      - nodes/metrics
+      - pods
+      - services
+    verbs:
+      - get
+      - list
+      - watch
+  # Rules which allow loki.source.kubernetes and loki.source.podlogs to work.
+  - apiGroups:
+      - ""
+    resources:
+      - pods
+      - pods/log
+      - namespaces
+    verbs:
+      - get
+      - list
+      - watch
+  - apiGroups:
+      - "monitoring.grafana.com"
+    resources:
+      - podlogs
+    verbs:
+      - get
+      - list
+      - watch
+  # Rules which allow mimir.rules.kubernetes to work.
+  - apiGroups: ["monitoring.coreos.com"]
+    resources:
+      - prometheusrules
+    verbs:
+      - get
+      - list
+      - watch
+  - nonResourceURLs:
+      - /metrics
+    verbs:
+      - get
+  # Rules for prometheus.kubernetes.*
+  - apiGroups: ["monitoring.coreos.com"]
+    resources:
+      - podmonitors
+      - servicemonitors
+      - probes
+    verbs:
+      - get
+      - list
+      - watch
+  # Rules which allow eventhandler to work.
+  - apiGroups:
+      - ""
+    resources:
+      - events
+    verbs:
+      - get
+      - list
+      - watch
+  # needed for remote.kubernetes.*
+  - apiGroups: [""]
+    resources:
+      - "configmaps"
+      - "secrets"
+    verbs:
+      - get
+      - list
+      - watch
+  # needed for otelcol.processor.k8sattributes
+  - apiGroups: ["apps"]
+    resources: ["replicasets"]
+    verbs: ["get", "list", "watch"]
+  - apiGroups: ["extensions"]
+    resources: ["replicasets"]
+    verbs: ["get", "list", "watch"]
+---
+# Source: alloy/templates/rbac.yaml
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: alloy
+  labels:
+    helm.sh/chart: alloy
+    app.kubernetes.io/name: alloy
+    app.kubernetes.io/instance: alloy
+    app.kubernetes.io/version: "vX.Y.Z"
+    app.kubernetes.io/managed-by: Helm
+    app.kubernetes.io/component: rbac
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: alloy
+subjects:
+  - kind: ServiceAccount
+    name: alloy
+    namespace: default

operations/helm/tests/host-alias/alloy/templates/service.yaml

@@ -0,0 +1,24 @@
+---
+# Source: alloy/templates/service.yaml
+apiVersion: v1
+kind: Service
+metadata:
+  name: alloy
+  labels:
+    helm.sh/chart: alloy
+    app.kubernetes.io/name: alloy
+    app.kubernetes.io/instance: alloy
+    app.kubernetes.io/version: "vX.Y.Z"
+    app.kubernetes.io/managed-by: Helm
+    app.kubernetes.io/component: networking
+spec:
+  type: ClusterIP
+  selector:
+    app.kubernetes.io/name: alloy
+    app.kubernetes.io/instance: alloy
+  internalTrafficPolicy: Cluster
+  ports:
+    - name: http-metrics
+      port: 12345
+      targetPort: 12345
+      protocol: "TCP"

operations/helm/tests/host-alias/alloy/templates/serviceaccount.yaml

@@ -0,0 +1,14 @@
+---
+# Source: alloy/templates/serviceaccount.yaml
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: alloy
+  namespace: default
+  labels:
+    helm.sh/chart: alloy
+    app.kubernetes.io/name: alloy
+    app.kubernetes.io/instance: alloy
+    app.kubernetes.io/version: "vX.Y.Z"
+    app.kubernetes.io/managed-by: Helm
+    app.kubernetes.io/component: rbac