Sonnet: Allow adjusting host mounts via chart values (#14)

Author: paweljw

templates/daemonset.yaml

@@ -90,9 +90,17 @@ spec:
         - name: docker-containers
           mountPath: /var/lib/docker/containers
           readOnly: true
+        {{- if .Values.collector.hostMounts.paths }}
+        {{- range $index, $path := .Values.collector.hostMounts.paths }}
+        - name: hostfs-{{ $index }}
+          mountPath: /host{{ $path }}
+          readOnly: true
+        {{- end }}
+        {{- else }}
         - name: hostfs
           mountPath: /host
           readOnly: true
+        {{- end }}
         resources:
           {{- toYaml .Values.collector.resources | nindent 10 }}
       {{- if .Values.beyla.enabled }}
@@ -198,10 +206,19 @@ spec:
       - name: docker-containers
         hostPath:
           path: /var/lib/docker/containers
+      {{- if .Values.collector.hostMounts.paths }}
+      {{- range $index, $path := .Values.collector.hostMounts.paths }}
+      - name: hostfs-{{ $index }}
+        hostPath:
+          path: {{ $path }}
+          type: ""
+      {{- end }}
+      {{- else }}
       - name: hostfs
         hostPath:
           path: /
           type: ""
+      {{- end }}
       {{- if .Values.beyla.enabled }}
       # Beyla volumes
       - name: sys-kernel-tracing

values.yaml

@@ -42,6 +42,15 @@ collector:
   # Port for internal OTLP communication
   otlpPort: 34320
 
+  # Host filesystem mount configuration
+  # By default, mounts the entire host root filesystem at /host (read-only)
+  # You can specify specific paths to mount instead. Each path will be mounted
+  # under /host with the same path structure (e.g., /var/www -> /host/var/www)
+  hostMounts:
+    # Array of host paths to mount. If empty, mounts root filesystem
+    # Example: ["/var/www/custom", "/var/lib/something"]
+    paths: []
+
 # Beyla configuration for eBPF tracing
 beyla:
   enabled: true