go k8s http server

philyawj · Aug 4, 2023 · 65d0787 · 65d0787
commit 65d0787
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diff --git a/Dockerfile b/Dockerfile
@@ -0,0 +1,12 @@
+FROM golang:alpine
+
+WORKDIR /app
+COPY . /app
+
+ENV BG_COLOR=pink
+ENV HEADING_COLOR=steelblue
+ENV HEADING_TEXT='Docker Golang HTTP Server'
+
+RUN go install
+
+CMD ["/go/bin/go-k8s-http-server"]
diff --git a/README.md b/README.md
@@ -0,0 +1,35 @@
+# Prerequisites
+
+Install minikube and kubectl.
+
+# Note
+
+Building and running the docker image locally instead of pushing to docker hub.
+
+# Run in Docker
+
+`docker build -t philyawj/go-k8s-http-server .`
+
+`docker run --rm -p 8080:8080 philyawj/go-k8s-http-server`
+
+![Alt text](./img/docker.png)
+
+http://localhost:8080
+
+# Run in Kubernetes
+
+`docker build -t philyawj/go-k8s-http-server .`
+
+`minikube image load philyawj/go-k8s-http-server`
+
+`minikube image ls`
+
+`kubectl apply -f service.yaml`
+
+`minikube service mywebapp`
+
+![Alt text](./img/k8-1.png)
+
+![Alt text](./img/k8-2.png)
+
+![Alt text](./img/pods.png)
diff --git a/go.mod b/go.mod
@@ -0,0 +1,3 @@
+module github.com/philyawj/go-k8s-http-server
+
+go 1.20
diff --git a/img/docker.png b/img/docker.png
diff --git a/img/k8-1.png b/img/k8-1.png
diff --git a/img/k8-2.png b/img/k8-2.png
diff --git a/img/pods.png b/img/pods.png
diff --git a/main.go b/main.go
@@ -0,0 +1,25 @@
+package main
+
+import (
+	"net/http"
+	"os"
+)
+
+func main() {
+	hostname, err := os.Hostname()
+	if err != nil {
+		panic(err)
+	}
+
+	server := &http.Server{Addr: ":8080"}
+	server.SetKeepAlivesEnabled(false)
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("<body style='background-color:" + os.Getenv("BG_COLOR") + ";'>" +
+			"<h1 style='color:" + os.Getenv("HEADING_COLOR") + ";'>" + os.Getenv("HEADING_TEXT") + "</h1>" +
+			"<h3>served from " + hostname + "</h3>" +
+			"</body>"))
+	})
+
+	server.ListenAndServe()
+}
diff --git a/service.yaml b/service.yaml
@@ -0,0 +1,53 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: mywebapp
+  labels:
+    app: mywebapp
+spec:
+  ports:
+  - port: 80
+    targetPort: 8080
+    protocol: TCP
+    name: gohttp
+  selector:
+    app: mywebapp
+    tier: http
+  type: LoadBalancer
+---
+kind: ConfigMap 
+apiVersion: v1 
+metadata:
+  name: myconfigmapv1.0
+data:
+  BG_COLOR: 'steelblue'
+  HEADING_COLOR: 'white'
+  HEADING_TEXT: 'Kubernetes Golang HTTP Server - refresh to see updated served from'
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: mydeployment
+  labels:
+    app: mywebapp
+spec:
+  replicas: 5
+  selector:
+    matchLabels:
+      app: mywebapp
+      tier: http
+  template:
+    metadata:
+      labels:
+        app: mywebapp
+        tier: http
+    spec:
+      containers:
+      - name: mycontainer
+        image: philyawj/go-k8s-http-server
+        imagePullPolicy: Never
+        ports:
+        - containerPort: 80
+        envFrom:
+        - configMapRef:
+            name: myconfigmapv1.0
Original file line number	Diff line number	Diff line change
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		module github.com/philyawj/go-k8s-http-server

		go 1.20