kubernetes - environment variables not works with integers

Question

I have one .netcore Web App running in "docker". So started to cluster it with kubernetes. Has four configs on the appsettings.json that will be converted by environment variables(all between "${}"):

   {
  "ConnectionSettings": [
    {
      "id": "${connectionSettings.connectionString.idMongoDb}",
      "databaseName": "${connectionSettings.connectionString.databaseName}",
      "connectionString": "${connectionSettings.connectionString.mongoDB}"
    }
  ],
    {
      "Key": "Token.Issuer",
      "Value": "${configuration.token.issuer}",
      "Description": "",
      "ModifiedDate": "2018-05-05 00:00:00.0000000",
      "ModifiedBy": "system",
      "AllowedProfiles": 1
    }
}

It's a bit of my .yaml file:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp-dev-api-dep
  labels:
    app: myapp-dev-api-dep
    tier: app
    version: v1
spec:
  selector:
    matchLabels:
      app: myapp-dev-api
      tier: app
      version: v1
  replicas: 1
  template:
    metadata:
      labels:
        app: myapp-dev-api
        tier: app
        version: v1
    spec:
      containers:
        - name: myapp-dev-api
          image: 'myappapi_tstkube:latest'
          env:
            - name: connectionSettings.connectionString.mongoDB
              value: mongodb://192.168.20.99:27017
            - name: configuration.token.issuer
              value: '86400'
          ports:
            - name: http 
              containerPort: 80
              protocol: TCP
          livenessProbe:
            initialDelaySeconds: 30
            periodSeconds: 3600
            httpGet:
              path: /swagger/index.html
              port: 80
          resources:
            requests:
              cpu: 25m
              memory: 200Mi
          terminationMessagePath: /dev/termination-log
          terminationMessagePolicy: File
          imagePullPolicy: IfNotPresent
      restartPolicy: Always
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 25%
      maxSurge: 25% 

Take a look in my configs:

The variable "connectionSettings.connectionString.mongoDB" works. But the variable "configuration.token.issuer" can't substituted on the appsetting.

Made some tests. I found the problem only with variables of numbers.

Has somebody an idea or have you had the problem?

vlw

Willable

Have you tried setting the environment variable configuration.token.issuer using double quotes as a string like "86400"? – Qumran

yes. One and two quotes("86400", '86400'). – Willable

Answer 1

The problem was in the yamls identification code. You may have many problems with the error space in the yaml file.

https://github.com/helm/helm/blob/master/docs/chart_template_guide/yaml_techniques.md

About the number. Both answers are right. You can use single quotation marks '86400' and ACII "\ x38 \ x36 \ x34 \ x30 \ x30".

Thank you everybody

Willable

Answer 2

You have to use ASCII codes for numbers. So your deployment spec will look like

env:
  - name: connectionSettings.connectionString.mongoDB
    value: "mongodb://192.168.20.99:27017"
  - name: configuration.token.issuer
    value: "\x38\x36\x34\x30\x30"

And check env variables:

sukhoversha@sukhoversha:~/GCP$ kubectl  exec myapp-dev-api-dep-7948866b56-6cnmk  env | grep con
connectionSettings.connectionString.mongoDB=mongodb://192.168.20.99:27017
configuration.token.issuer=86400

Maximin