Deployment configuration parameter from file or Environment

General Discussions
1

Dear all,
I’m new in Kubernetes, there is a possibility to read deployment or service parameters from file or environment or ConfigMap?

As example

apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-yaml
labels:
app.kubernetes.io/name: nginx-yaml-service
app.kubernetes.io/instance: nginx-yaml-service-06092021
environment: aks-test
spec:
replicas: $ReplicasNumber
selector:
matchLabels:
app: nginx-yaml
minReadySeconds: $minReadySeconds or configMap.minreadySec
strategy:
rollingUpdate:
maxSurge: $maxSurge or configMap.maxSurge
maxUnavailable: 0
type: RollingUpdate
template:
metadata:
labels:
app: nginx-yaml
…

thanks

2

I can’t say that I’ve seen anything around that enables that kind of functionality. What are you trying to achieve, generic templating/modification or something else? If the former you’d want to look at things like helm, kustomize or kpt.

3

Thanks for your response,

I’m trying to made a solution like:

ports:
- name: liveness-port
  containerPort: 8080
  hostPort: 8080

livenessProbe:
  httpGet:
    path: /healthz
    port: liveness-port
  failureThreshold: 1
  periodSeconds: 10

startupProbe:
  httpGet:
    path: /healthz
    port: liveness-port
  failureThreshold: 30
  periodSeconds: 10

in this case liveness-port is “as a parameter/variable”. It is possible to define as example also “path” as parameter?

paths:
- name: hc-path
  path: /healthz

ports:
- name: liveness-port
  containerPort: 8080
  hostPort: 8080

livenessProbe:
  httpGet:
    path: hc-path
    port: liveness-port
  failureThreshold: 1
  periodSeconds: 10

startupProbe:
  httpGet:
    path: hc-path
    port: liveness-port
  failureThreshold: 30
  periodSeconds: 10

Thanks for your time

4

I think the closest you’ll be able to get to that functionality is using https://kustomize.io/ and it’s patches/overlays feature .