updates to add config to deployments

Author: marcel-dempers

docker-compose.yaml

@@ -10,13 +10,14 @@ services:
     - ./c#/src/:/work/
     ports:
       - 5000:5000
-  golang: #docker run -it -v ${PWD}:/go/src/work -p 5001:5000 -p 2345:2345 --security-opt "seccomp:unconfined" aimvector/golang:1.0.0
+  golang: #docker run -it -v ${PWD}:/go/src/work -v ${PWD}/golang/configs/:/configs -p 5001:5000 -p 2345:2345 --security-opt "seccomp:unconfined" aimvector/golang:1.0.0
     container_name: golang
     image: aimvector/golang:1.0.0
     build: 
       context: ./golang
       target: prod
     volumes:
+    - ./golang/configs:/configs/
     - ./golang/src/:/go/src/work/
     ports:
       - 5001:5000

golang/configs/config.json

@@ -0,0 +1,3 @@
+{
+	"environment" : "dev"
+}

golang/src/main.go

@@ -6,22 +6,39 @@ import (
 	//our web server that will host the mock
 	"github.com/buaazp/fasthttprouter" 
 	"github.com/valyala/fasthttp"
+	"os"
+	"io/ioutil"
 )
 
+var configuration []byte
+
 func Response(ctx *fasthttp.RequestCtx) {
 	fmt.Fprintf(ctx, "Hello") 
 }
 
 func Status(ctx *fasthttp.RequestCtx) {
 	fmt.Fprintf(ctx, "ok") 
 }
+
+func ReadConfig(){
+	fmt.Println("reading config...")
+	config, e := ioutil.ReadFile("/configs/config.json")
+	if e != nil {
+		fmt.Printf("Error reading config file: %v\n", e)
+		os.Exit(1)
+	}
+	configuration = config
+	fmt.Println("config loaded!")
+
+}
+
 func main() {
 
 	fmt.Println("starting...")
-
+	ReadConfig()
 	router := fasthttprouter.New()
 	router.GET("/", Response)
 	router.GET("/status", Status)
 
 	log.Fatal(fasthttp.ListenAndServe(":5000", router.Handler))
-}
+}

kubernetes/configmaps/configmap.yaml

@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: example-config
+data:
+  config.json: |
+    {
+      "environment" : "dev"
+    }
+# kubectl create configmap example-config --from-file ./golang/configs/config.json

kubernetes/deployments/deployment.yaml

@@ -30,4 +30,11 @@ spec:
             cpu: "50m"
           limits:
             memory: "256Mi"
-            cpu: "500m"
+            cpu: "500m"
+         volumeMouts:
+         -  name: config-volume
+            mountPath: /configs/
+       volumes:
+         - name: config-volume
+           configMap:
+             name: example-config #name of our configmap object