flow

05-create-helm-charts/07-flow-control/if-else.md

@@ -8,31 +8,59 @@
     # Default case
 {{ end }}
 ```
-
-#### examin the ntchart1 from [github repo](https://github.com/lerndevops/helm-charts/tree/main/05-create-helm-charts/06-named-templates/ntchart1) 
+## logic flow control functions
+* [Logic and Flow Control Functions](https://helm.sh/docs/chart_template_guide/function_list/#logic-and-flow-control-functions)
+* Helm includes numerous logic and control flow functions including and, coalesce, default, empty, eq, fail, ge, gt, le, lt, ne, not, and or.
+---
+## if-else eq
+#### examin the iechart1 from [github repo](iechart1/) 
 
 ```sh
 # get the chart to local 
 cd $HOME ; git clone https://github.com/lerndevops/helm-charts
 cd $HOME/helm-charts/05-create-helm-charts/07-flow-control/iechart1
-cat templates/deployment.yaml
 ```
-```yaml 
-{{/* define template for common Labels */}}
-{{- define "nt.labels"}}
-    app: sapp
-{{- end }}
-
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: {{ .Release.Name }}-app
-  labels:
-  {{- template "nt.labels" }}
+```sh
+cat values.yaml  # observe the values 
+cat templates/deployment.yaml  # observe if else condition used for replicas 
 ```
 ```sh
 # dry run the chart and observe the output rendered properly 
 
-cd $HOME/helm-charts/05-create-helm-charts/06-named-templates/ntchart1
-helm install ntchart1-rel . --dry-run 
+cd $HOME/helm-charts/05-create-helm-charts/07-flow-control/iechart1
+helm install iec1-rel . --dry-run 
+```
+```yaml
+# output as below 
+
+NAME: iec1-rel
+LAST DEPLOYED: Tue Oct 10 20:14:17 2023
+NAMESPACE: default
+STATUS: pending-install
+REVISION: 1
+TEST SUITE: None
+HOOKS:
+MANIFEST:
+---
+# Source: iec1/templates/deployment.yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: iec1-rel-app
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: iec
+  template:
+    metadata:
+      labels:
+        app: iec
+    spec:
+      containers:
+      - name: sampleapp
+        image: docker.io/lerndevops/samples:pyapp-v2
+        ports:
+        - containerPort: 8080
 ```
+---