initial commit

testapp/srv/Dockerfile

@@ -0,0 +1,15 @@
+FROM golang:alpine
+ARG VERSION
+RUN mkdir /build 
+ADD . /build/
+WORKDIR /build 
+RUN CGO_ENABLED=0 GOOS=linux go build -a -gcflags '-e' -ldflags "-X main.version=$VERSION -s -w" -o main .
+RUN echo -e "root:x:0:0:root:/:\nappuser:x:1000:1000:appuser:/:" > /etc/passwd
+RUN echo -e "root:x:0:root\nappuser:x:1000:" > /etc/group
+FROM scratch
+COPY --from=0 /build/main /
+COPY --from=0 /etc/passwd /etc/
+COPY --from=0 /etc/group /etc/
+USER appuser
+EXPOSE 8080
+ENTRYPOINT ["/main"]

testapp/srv/Makefile

@@ -0,0 +1,13 @@
+CC=docker
+APP=srv
+TAG=127.0.0.1:5000/testapp/$(APP):$(VERSION)
+
+all: build push
+
+build:
+	$(CC) build --build-arg VERSION=$(VERSION) -t $(TAG) .
+
+push:
+	$(CC) push $(TAG)
+
+.PHONY: build push

testapp/srv/main.go

@@ -0,0 +1,73 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"os/user"
+	"strconv"
+	"time"
+)
+
+var version string
+
+func get(c *http.Client, url string) (body string, err error) {
+	resp, err := c.Get(url)
+	if err != nil {
+		return
+	}
+	defer resp.Body.Close()
+	b, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return
+	}
+	body = string(b)
+	return
+}
+
+func main() {
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		log.Printf("%s %s %s", r.RemoteAddr, r.Method, r.URL)
+		h, err := os.Hostname()
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		u, err := user.LookupId(strconv.Itoa(os.Getuid()))
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		//url := "http://" + os.Getenv("DB_SERVICE_HOST") + ":" + os.Getenv("DB_SERVICE_PORT")
+		//url := "http://testapp-db.default.svc.cluster.local:8080"
+		c := &http.Client{Transport: &http.Transport{
+			DialContext: (&net.Dialer{
+				Timeout: 5 * time.Second,
+			}).DialContext,
+		}}
+		dbUrl := "http://testapp-db:8080"
+		dbBody, err := get(c, dbUrl)
+		if err != nil {
+			dbBody = err.Error()
+		}
+		apiUrl := "http://testapp-api:8080"
+		apiBody, err := get(c, apiUrl)
+		if err != nil {
+			apiBody = err.Error()
+		}
+		fmt.Fprintf(w, "Version: %s\nHostname: %s\nUser: %s (%s) (%s)\nDB URL: %s\nDB Response: %s\nAPI URL: %s\nAPI Response: %s\n",
+			version, h, u.Username, u.Uid, u.Gid,
+			dbUrl, dbBody,
+			apiUrl, apiBody)
+	})
+	s := &http.Server{
+		ReadTimeout:  5 * time.Second,
+		WriteTimeout: 10 * time.Second,
+		IdleTimeout:  120 * time.Second,
+		Addr:         ":8080",
+	}
+	log.Fatal(s.ListenAndServe())
+}

testapp/srv/srv-v1-istio.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: testapp-srv
+  labels:
+    app: testapp-srv
+    version: v1
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: testapp-srv
+      version: v1
+  template:
+    metadata:
+      labels:
+        app: testapp-srv
+        version: v1
+    spec:
+      containers:
+      - name: testapp-srv
+        image: 127.0.0.1:5000/testapp/srv:v1
+        imagePullPolicy: Always
+        ports:
+        - containerPort: 8080
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: testapp-srv
+spec:
+  type: ClusterIP
+  ports:
+  - name: http
+    port: 8080
+  selector:
+    app: testapp-srv
+---
+apiVersion: networking.istio.io/v1alpha3
+kind: Gateway
+metadata:
+  name: testapp-srv
+spec:
+  selector:
+    istio: ingressgateway
+  servers:
+  - port:
+      number: 80
+      name: http
+      protocol: HTTP
+    hosts:
+    - "k8s-testapp.example.com"
+---
+apiVersion: networking.istio.io/v1alpha3
+kind: VirtualService
+metadata:
+  name: testapp-srv
+spec:
+  gateways:
+  - testapp-srv
+  hosts:
+  - "k8s-testapp.example.com"
+  http:
+  - route:
+    - destination:
+        port:
+          number: 8080
+        host: testapp-srv.default.svc.cluster.local

testapp/srv/srv-v1.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: testapp-srv
+  labels:
+    app: testapp-srv
+    version: v1
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: testapp-srv
+      version: v1
+  template:
+    metadata:
+      labels:
+        app: testapp-srv
+        version: v1
+    spec:
+      containers:
+      - name: testapp-srv
+        image: 127.0.0.1:5000/testapp/srv:v1
+        imagePullPolicy: Always
+        ports:
+        - containerPort: 8080
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: testapp-srv
+spec:
+  type: ClusterIP
+  ports:
+  - name: http
+    port: 8080
+  selector:
+    app: testapp-srv
+---
+---
+apiVersion: networking.k8s.io/v1beta1
+kind: Ingress
+metadata:
+  name: testapp-srv
+  annotations:
+    kubernetes.io/ingress.class: "nginx"
+spec:
+  rules:
+  - host: k8s-testapp.example.com
+    http:
+      paths:
+      - backend:
+          serviceName: testapp-srv
+          servicePort: 8080