spec: template: spec: containers: - name: istio-proxy env: - name: ISTIO_BOOTSTRAP_OVERRIDE value: /etc/istio/custom-bootstrap/custom_bootstrap.json volumeMounts: - mountPath: /etc/istio/custom-bootstrap name: custom-bootstrap-volume readOnly: true volumes: - configMap: name: istio-custom-bootstrap-config defaultMode: 420 optional: false name: custom-bootstrap-volume