How does one pass an override file to specific Service YAML file using Helm? - kubernetes

Question

I am trying to pass a toleration when deploying to a chart located in stable. The toleration should be applied to a specific YAML file in the templates directory, NOT the values.yaml file as it is doing by default.
I've applied using patch and I can see that the change I need would work if it were applied to the right Service, which is a DaemonSet.
Currently I'm trying "helm install -f tolerations.yaml --name release_here"
This is simply creating a one-off entry when running get chart release_here, and is not in the correct service YAML

Answer 1

Quoting your requirement
The toleration should be applied to a specific YAML file in the
templates directory
First, in order to make it happen your particular helm chart file needs to allow such an end-user customization.
Here is the example based on stable/kiam chart:
Definition of kiam/templates/server-daemonset.yaml
{{- if .Values.server.enabled -}}
apiVersion: apps/v1beta2
kind: DaemonSet
metadata:
labels:
app: {{ template "kiam.name" . }}
chart: {{ template "kiam.chart" . }}
component: "{{ .Values.server.name }}"
heritage: {{ .Release.Service }}
release: {{ .Release.Name }}
name: {{ template "kiam.fullname" . }}-server
spec:
selector:
matchLabels:
app: {{ template "kiam.name" . }}
component: "{{ .Values.server.name }}"
release: {{ .Release.Name }}
template:
metadata:
{{- if .Values.server.podAnnotations }}
annotations:
{{ toYaml .Values.server.podAnnotations | indent 8 }}
{{- end }}
labels:
app: {{ template "kiam.name" . }}
component: "{{ .Values.server.name }}"
release: {{ .Release.Name }}
{{- if .Values.server.podLabels }}
{{ toYaml .Values.server.podLabels | indent 8 }}
{{- end }}
spec:
serviceAccountName: {{ template "kiam.serviceAccountName.server" . }}
hostNetwork: {{ .Values.server.useHostNetwork }}
{{- if .Values.server.nodeSelector }}
nodeSelector:
{{ toYaml .Values.server.nodeSelector | indent 8 }}
{{- end }}
tolerations: <---- TOLERATIONS !
{{ toYaml .Values.server.tolerations | indent 8 }}
{{- if .Values.server.affinity }}
affinity:
{{ toYaml .Values.server.affinity | indent 10 }}
{{- end }}
volumes:
- name: tls
Override default values.yaml with your customs-values to set toleration in Pod spec of DeamonSet.
server:
enabled: true
tolerations: ## Agent container resources
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: foo.bar.com/role
operator: In
values:
- master
Render the resulting manifest file, to see how it would look like when overriding default values with install/upgrade helm command using --values/--set argument:
helm template --name my-release . -x templates/server-daemonset.yaml --values custom-values.yaml
Rendered file (output truncated):
---
# Source: kiam/templates/server-daemonset.yaml
apiVersion: apps/v1beta2
kind: DaemonSet
metadata:
labels:
app: kiam
chart: kiam-2.5.1
component: "server"
heritage: Tiller
release: my-release
name: my-release-kiam-server
spec:
selector:
matchLabels:
app: kiam
component: "server"
release: my-release
template:
metadata:
labels:
app: kiam
component: "server"
release: my-release
spec:
serviceAccountName: my-release-kiam-server
hostNetwork: false
tolerations:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: foo.bar.com/role
operator: In
values:
- master
volumes:
...
I hope this will help you to solve your problem.