tracing examples

2025-06-06 17:01:30 +00:00 · 2021-02-03 08:18:08 +11:00 · 2021-02-03 08:18:08 +11:00 · d2278b7e2e
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--- a/tracing/README.md
+++ b/tracing/README.md
@ -0,0 +1,142 @@
+# Introduction to Distributed Tracing
+
+In this episode we take a look at distributed tracing.
+We'll take a look at the concept, what distributed tracing is, what problems it solves, how to emit traces and the platform architecture to collect traces.
+
+## Example microservice architecture
+
+First of all, we need an example application. 
+In this demo, I have a few microservices that work together to form a video catalog.
+
+## A simple Web UI: videos-web
+<hr/>
+<br/>
+
+Consider `videos-web` <br/>
+It's an HTML application that lists a bunch of playlists with videos in them.
+
+```
+------------+
+| videos-web |
+|            |
+------------+
+```
+<br/>
+
+## A simple API: playlists-api
+<hr/>
+<br/>
+
+For `videos-web` to get any content, it needs to make a call to `playlists-api`
+
+```
+------------+     +---------------+
+| videos-web +---->+ playlists-api |
+|            |     |               |
+------------+     +---------------+
+
+```
+
+Playlists consist of data like `title`, `description` etc, and a list of `videos`. <br/>
+Playlists are stored in a database. <br/>
+`playlists-api` stores its data in a database
+
+```
+------------+     +---------------+    +--------------+
+| videos-web +---->+ playlists-api +--->+ playlists-db |
+|            |     |               |    |              |
+------------+     +---------------+    +--------------+
+
+```
+
+<br/>
+
+## A little complexity
+<hr/>
+<br/>
+
+Each playlist item contains only a list of video id's. <br/>
+A playlist does not have the full metadata of each video. <br/>
+
+Example `playlist`:
+```
+{
+  "id" : "playlist-01",
+  "title": "Cool playlist",
+  "videos" : [ "video-1", "video-x" , "video-b"]
+}
+```
+Take not above `videos: []` is a list of video id's <br/>
+
+Videos have their own `title` and `description` and other metadata. <br/>
+
+To get this data, we need a `videos-api` <br/>
+This `videos-api` has its own database too <br/>
+
+```
+------------+       +-----------+
+| videos-api +------>+ videos-db |
+|            |       |           |
+------------+       +-----------+
+```
+
+For the `playlists-api` to load all the video data, it needs to call `videos-api` for each video ID it has.<br/>
+<br/>
+
+## Traffic flow
+<hr/>
+<br/>
+A single `GET` request to the `playlists-api` will get all the playlists 
+from its database with a single DB call <br/>
+
+For every playlist and every video in each list, a separate `GET` call will be made to the `videos-api` which will
+retrieve the video metadata from its database. <br/>
+
+This will result in many network fanouts between `playlists-api` and `videos-api` and many call to its database. <br/>
+This is intentional to demonstrate a busy network.
+
+<br/>
+
+## Full application architecture
+<hr/>
+<br/>
+
+```
+
+------------+     +---------------+    +--------------+
+| videos-web +---->+ playlists-api +--->+ playlists-db |
+|            |     |               |    |              |
+------------+     +-----+---------+    +--------------+
+                         |
+                         v
+                   +-----+------+       +-----------+
+                   | videos-api +------>+ videos-db |
+                   |            |       |           |
+                   +------------+       +-----------+
+
+```
+<br/>
+
+## Run the apps: Docker
+<hr/>
+<br/>
+There is a `docker-compose.yaml`  in this directory. <br/>
+Change your terminal to this folder and run:
+
+```
+docker-compose build
+
+docker-compose up
+
+```
+
+You can access the app on `http://localhost`. <br/> 
+You should now see the complete architecture in the browser 
+<br/>
+
+## Traces
+
+<hr/>
+<br/>
+
+To see our traces, we can access the Jaeger UI on `http://localhost:16686`
--- a/tracing/applications-go/playlists-api/app.go
+++ b/tracing/applications-go/playlists-api/app.go
@ -0,0 +1,193 @@
+package main
+
+import (
+	"net/http"
+	"github.com/julienschmidt/httprouter"
+	log "github.com/sirupsen/logrus"
+	"encoding/json"
+	"fmt"
+	"os"
+	"bytes"
+	"io/ioutil"
+	"context"
+	"github.com/go-redis/redis/v8"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/uber/jaeger-client-go"
+	"github.com/uber/jaeger-client-go/config"
+	"github.com/opentracing/opentracing-go/ext"
+)
+
+const serviceName = "playlists-api"
+
+var environment = os.Getenv("ENVIRONMENT")
+var redis_host = os.Getenv("REDIS_HOST")
+var redis_port = os.Getenv("REDIS_PORT")
+var ctx = context.Background()
+var rdb *redis.Client
+
+func main() {
+
+	cfg := &config.Configuration{
+		ServiceName: serviceName,
+
+		// "const" sampler is a binary sampling strategy: 0=never sample, 1=always sample.
+		Sampler: &config.SamplerConfig{
+			Type:  "const",
+			Param: 1,
+		},
+
+		// Log the emitted spans to stdout.
+		Reporter: &config.ReporterConfig{
+			LogSpans: true,
+			LocalAgentHostPort: "jaeger:6831",
+		},
+	}
+
+	tracer, closer, err := cfg.NewTracer(config.Logger(jaeger.StdLogger))
+	if err != nil {
+		panic(fmt.Sprintf("ERROR: cannot init Jaeger: %v\n", err))
+	}
+	defer closer.Close()
+	opentracing.SetGlobalTracer(tracer)
+
+	router := httprouter.New()
+
+	router.GET("/", func(w http.ResponseWriter, r *http.Request, p httprouter.Params){
+
+		spanCtx, _ := tracer.Extract(
+			opentracing.HTTPHeaders,
+			opentracing.HTTPHeadersCarrier(r.Header),
+		)
+
+		span := tracer.StartSpan("/ GET", ext.RPCServerOption(spanCtx))
+		defer span.Finish()
+
+		cors(w)
+
+		ctx := opentracing.ContextWithSpan(context.Background(), span)
+		playlistsJson := getPlaylists(ctx)
+		
+		playlists := []playlist{}
+		err := json.Unmarshal([]byte(playlistsJson), &playlists)
+		if err != nil {
+			panic(err)
+		}
+
+		//get videos for each playlist from videos api
+		for pi := range playlists {
+
+			vs := []videos{}
+			for vi := range playlists[pi].Videos {
+			 
+			 	span, _ := opentracing.StartSpanFromContext(ctx, "videos-api GET")
+			
+
+				v := videos{}
+
+				req, err := http.NewRequest("GET", "http://videos-api:10010/" + playlists[pi].Videos[vi].Id, nil)
+				if err != nil {
+					panic(err)
+				}
+
+				span.Tracer().Inject(
+					span.Context(),
+					opentracing.HTTPHeaders,
+					opentracing.HTTPHeadersCarrier(req.Header),
+				)
+
+				videoResp, err :=http.DefaultClient.Do(req)
+			
+				span.Finish()
+				if err != nil {
+					fmt.Println(err)
+					span.SetTag("error", true)
+					break
+				}
+
+				defer videoResp.Body.Close()
+				video, err := ioutil.ReadAll(videoResp.Body)
+
+				if err != nil {
+					panic(err)
+				}
+
+				
+				err = json.Unmarshal(video, &v)
+
+				if err != nil {
+					panic(err)
+				}
+				
+				vs = append(vs, v)
+
+			}
+
+			playlists[pi].Videos = vs
+		}
+
+		playlistsBytes, err := json.Marshal(playlists)
+		if err != nil {
+			panic(err)
+		}
+
+		reader := bytes.NewReader(playlistsBytes)
+		if b, err := ioutil.ReadAll(reader); err == nil {
+			fmt.Fprintf(w, "%s", string(b))
+		}
+
+	})
+
+	r := redis.NewClient(&redis.Options{
+		Addr:     redis_host + ":" + redis_port,
+		DB:       0,
+	})
+	rdb = r
+
+	fmt.Println("Running...")
+	log.Fatal(http.ListenAndServe(":10010", router))
+}
+
+func getPlaylists(ctx context.Context)(response string){
+
+	span, _ := opentracing.StartSpanFromContext(ctx, "redis-get")
+	defer span.Finish()
+	playlistData, err := rdb.Get(ctx, "playlists").Result()
+	
+	if err != nil {
+		fmt.Println(err)
+		fmt.Println("error occured retrieving playlists from Redis")
+		span.SetTag("error", true)
+		return "[]"
+	}
+
+	return playlistData
+}
+
+type playlist struct {
+	Id string `json:"id"`
+	Name string `json:"name"`
+	Videos []videos `json:"videos"`
+}
+
+type videos struct {
+	Id string `json:"id"`
+	Title string `json:"title"`
+	Description string `json:"description"`
+	Imageurl string `json:"imageurl"`
+	Url string `json:"url"`
+
+}
+
+type stop struct {
+	error
+}
+
+func cors(writer http.ResponseWriter) () {
+	if(environment == "DEBUG"){
+		writer.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
+		writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, accept, origin, Cache-Control, X-Requested-With, X-MY-API-Version")
+		writer.Header().Set("Access-Control-Allow-Credentials", "true")
+		writer.Header().Set("Access-Control-Allow-Origin", "*")
+	}
+}
--- a/tracing/applications-go/playlists-api/deploy.yaml
+++ b/tracing/applications-go/playlists-api/deploy.yaml
@ -0,0 +1,70 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: playlists-api
+  labels:
+    app: playlists-api
+spec:
+  selector:
+    matchLabels:
+      app: playlists-api
+  replicas: 1
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 0
+  template:
+    metadata:
+      labels:
+        app: playlists-api
+    spec:
+      containers:
+      - name: playlists-api
+        image: aimvector/jaeger-tracing:playlists-api-1.0.0
+        imagePullPolicy : Always
+        ports:
+        - containerPort: 10010
+        env:
+        - name: "ENVIRONMENT"
+          value: "DEBUG"
+        - name: "REDIS_HOST"
+          value: "playlists-db"
+        - name: "REDIS_PORT"
+          value: "6379"
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: playlists-api
+  labels:
+    app: playlists-api
+spec:
+  type: ClusterIP
+  selector:
+    app: playlists-api
+  ports:
+    - protocol: TCP
+      name: http
+      port: 80
+      targetPort: 10010
+---
+apiVersion: networking.k8s.io/v1beta1
+kind: Ingress
+metadata:
+  annotations:
+    kubernetes.io/ingress.class: "nginx"
+    nginx.ingress.kubernetes.io/ssl-redirect: "false"
+    nginx.ingress.kubernetes.io/rewrite-target: /$2
+  name: playlists-api
+spec:
+  rules:
+  - host: servicemesh.demo
+    http:
+      paths:
+      - path: /api/playlists(/|$)(.*)
+        backend:
+          serviceName: playlists-api
+          servicePort: 80
+
+
--- a/tracing/applications-go/playlists-api/dockerfile
+++ b/tracing/applications-go/playlists-api/dockerfile
@ -0,0 +1,18 @@
+FROM golang:1.15-alpine as build
+RUN apk add --no-cache git
+
+WORKDIR /src 
+
+COPY go.sum /src/
+COPY go.mod /src/
+RUN go mod download
+
+COPY app.go /src
+
+RUN go build -o app
+
+FROM alpine:3.12
+
+RUN mkdir -p /app
+COPY --from=build /src/app /app/app
+CMD ["./app/app"]
--- a/tracing/applications-go/playlists-api/go.mod
+++ b/tracing/applications-go/playlists-api/go.mod
@ -0,0 +1,14 @@
+module example.com/playlists-api
+
+go 1.14
+
+require (
+	github.com/go-redis/redis/v8 v8.0.0-beta.7
+	github.com/julienschmidt/httprouter v1.3.0
+	github.com/opentracing/opentracing-go v1.1.1-0.20190913142402-a7454ce5950e
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/sirupsen/logrus v1.6.0
+	github.com/uber/jaeger-client-go v2.25.0+incompatible
+	github.com/uber/jaeger-lib v2.4.0+incompatible // indirect
+	go.uber.org/atomic v1.7.0 // indirect
+)
--- a/tracing/applications-go/playlists-api/go.sum
+++ b/tracing/applications-go/playlists-api/go.sum
@ -0,0 +1,142 @@
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--- a/tracing/applications-go/playlists-db/appendonly.aof
+++ b/tracing/applications-go/playlists-db/appendonly.aof
@ -0,0 +1,36 @@
+*2
+$6
+SELECT
+$1
+0
+*3
+$3
+set
+$9
+playlists
+$515
+
+	[
+		{
+			"id" : "1",
+			"name" : "CI/CD",
+			"videos": [ { "id" : "OFgziggbCOg"}, { "id" : "myCcJJ_Fk10"}, { "id" : "2WSJF7d8dUg"}]
+		},
+		{
+			"id" : "2",
+			"name" : "K8s in the Cloud",
+			"videos": [ { "id" : "QThadS3Soig"}, { "id" : "eyvLwK5C2dw"}]
+		},
+		{
+			"id" : "3",
+			"name" : "Storage and MessageBrokers",
+			"videos": [ { "id" : "JmCn7k0PlV4"}, { "id" : "_lpDfMkxccc"}]
+
+		},
+		{
+			"id" : "4",
+			"name" : "K8s Autoscaling",
+			"videos": [ { "id" : "jM36M39MA3I"}, { "id" : "FfDI08sgrYY"}]
+		}
+	]
+	
--- a/tracing/applications-go/playlists-db/configmap.yaml
+++ b/tracing/applications-go/playlists-db/configmap.yaml
--- a/tracing/applications-go/playlists-db/deploy.yaml
+++ b/tracing/applications-go/playlists-db/deploy.yaml
@ -0,0 +1,59 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: playlists-db
+  labels:
+    app: playlists-db
+spec:
+  selector:
+    matchLabels:
+      app: playlists-db
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: playlists-db
+    spec:
+      initContainers:
+      - name: data
+        image: busybox
+        command: [ "sh", "-c" ]
+        args:
+          - |
+            cp /config/appendonly.aof /tmp/appendonly.aof
+        volumeMounts:
+        - name: data
+          mountPath: /tmp/
+        - name: config
+          mountPath: /config/
+      containers:
+      - name: playlists-db
+        image: redis:6.0-alpine
+        ports:
+        - containerPort: 6379
+        volumeMounts:
+        - name: data
+          mountPath: /tmp/
+        command: [ "redis-server"]
+        args: ["--dir", "/tmp", "--appendonly", "yes"]
+      volumes:
+      - name: data
+        emptyDir: {}
+      - name: config
+        configMap:
+          name: playlists-db
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: playlists-db
+  labels:
+    app: playlists-db
+spec:
+  type: ClusterIP
+  selector:
+    app: playlists-db
+  ports:
+    - protocol: TCP
+      port: 6379
+      targetPort: 6379
--- a/tracing/applications-go/videos-api/app.go
+++ b/tracing/applications-go/videos-api/app.go
@ -0,0 +1,145 @@
+package main
+
+import (
+	"net/http"
+	"github.com/julienschmidt/httprouter"
+	log "github.com/sirupsen/logrus"
+	"github.com/go-redis/redis/v8"
+	"fmt"
+	"context"
+	"os"
+	"math/rand"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/uber/jaeger-client-go"
+	"github.com/uber/jaeger-client-go/config"
+	"github.com/opentracing/opentracing-go/ext"
+)
+
+//TODO : https://opentracing.io/guides/golang/quick-start/
+// docker run --rm -it -p 6831:6831/udp -p 16686:16686 -p 14269:14269  --net tracing --name jaeger jaegertracing/all-in-one:latest
+
+const serviceName = "videos-api"
+
+var environment = os.Getenv("ENVIRONMENT")
+var redis_host = os.Getenv("REDIS_HOST")
+var redis_port = os.Getenv("REDIS_PORT")
+var flaky = os.Getenv("FLAKY")
+
+var ctx = context.Background()
+var rdb *redis.Client
+
+func main() {
+	
+  cfg := &config.Configuration{
+		ServiceName: serviceName,
+
+		// "const" sampler is a binary sampling strategy: 0=never sample, 1=always sample.
+		Sampler: &config.SamplerConfig{
+			Type:  "const",
+			Param: 1,
+		},
+
+		// Log the emitted spans to stdout.
+		Reporter: &config.ReporterConfig{
+			LogSpans: true,
+			LocalAgentHostPort: "jaeger:6831",
+		},
+	}
+
+	tracer, closer, err := cfg.NewTracer(config.Logger(jaeger.StdLogger))
+	if err != nil {
+		panic(fmt.Sprintf("ERROR: cannot init Jaeger: %v\n", err))
+	}
+	defer closer.Close()
+	opentracing.SetGlobalTracer(tracer)
+	
+	router := httprouter.New()
+
+	router.GET("/:id", func(w http.ResponseWriter, r *http.Request, p httprouter.Params){
+		
+		spanCtx, _ := tracer.Extract(
+			opentracing.HTTPHeaders,
+			opentracing.HTTPHeadersCarrier(r.Header),
+		)
+
+		span := tracer.StartSpan("/id GET", ext.RPCServerOption(spanCtx))
+		defer span.Finish()
+
+		if flaky == "true"{
+			if rand.Intn(90) < 30 {
+				panic("flaky error occurred ")
+		  } 
+		}
+		
+		ctx := opentracing.ContextWithSpan(context.Background(), span)
+		video := video(w,r,p, ctx)
+
+		cors(w)
+		fmt.Fprintf(w, "%s", video)
+	 
+	})
+
+	r := redis.NewClient(&redis.Options{
+		Addr:     redis_host + ":" + redis_port,
+		DB:       0,
+	})
+	rdb = r
+
+	fmt.Println("Running...")
+	log.Fatal(http.ListenAndServe(":10010", router))
+}
+
+func video(writer http.ResponseWriter, request *http.Request, p httprouter.Params, ctx context.Context)(response string){
+	
+	span, _ := opentracing.StartSpanFromContext(ctx, "redis-get")
+	defer span.Finish()
+	id := p.ByName("id")
+	
+	videoData, err := rdb.Get(ctx, id).Result()
+	if err == redis.Nil {
+
+		span.Tracer().Inject(
+			span.Context(),
+			opentracing.HTTPHeaders,
+			opentracing.HTTPHeadersCarrier(request.Header),
+		)
+		
+		return "{}"
+		
+		
+	} else if err != nil {
+		panic(err)
+	} else {
+	  
+		span.Tracer().Inject(
+			span.Context(),
+			opentracing.HTTPHeaders,
+			opentracing.HTTPHeadersCarrier(request.Header),
+		)
+
+		return videoData
+	}
+}
+
+type stop struct {
+	error
+}
+
+func cors(writer http.ResponseWriter) () {
+	if(environment == "DEBUG"){
+		writer.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
+		writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, accept, origin, Cache-Control, X-Requested-With, X-MY-API-Version")
+		writer.Header().Set("Access-Control-Allow-Credentials", "true")
+		writer.Header().Set("Access-Control-Allow-Origin", "*")
+	}
+}
+
+type videos struct {
+	Id string `json:"id"`
+	Title string `json:"title"`
+	Description string `json:"description"`
+	Imageurl string `json:"imageurl"`
+	Url string `json:"url"`
+
+}
--- a/tracing/applications-go/videos-api/deploy.yaml
+++ b/tracing/applications-go/videos-api/deploy.yaml
@ -0,0 +1,55 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: videos-api
+  labels:
+    app: videos-api
+spec:
+  selector:
+    matchLabels:
+      app: videos-api
+  replicas: 1
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 0
+  template:
+    metadata:
+      labels:
+        app: videos-api
+    spec:
+      containers:
+      - name: videos-api
+        image: aimvector/jaeger-tracing:videos-api-1.0.0
+        imagePullPolicy : Always
+        ports:
+        - containerPort: 10010
+        env:
+        - name: "ENVIRONMENT"
+          value: "DEBUG"
+        - name: "REDIS_HOST"
+          value: "videos-db"
+        - name: "REDIS_PORT"
+          value: "6379"
+        - name: "FLAKY"
+          value: "false"
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: videos-api
+  labels:
+    app: videos-api
+spec:
+  type: ClusterIP
+  selector:
+    app: videos-api
+  ports:
+    - protocol: TCP
+      name: http
+      port: 10010
+      targetPort: 10010
+---
+
+
--- a/tracing/applications-go/videos-api/dockerfile
+++ b/tracing/applications-go/videos-api/dockerfile
@ -0,0 +1,18 @@
+FROM golang:1.15-alpine as build
+RUN apk add --no-cache git
+
+WORKDIR /src 
+
+COPY go.sum /src/
+COPY go.mod /src/
+RUN go mod download
+
+COPY app.go /src
+
+RUN go build -o app
+
+FROM alpine:3.12
+
+RUN mkdir -p /app
+COPY --from=build /src/app /app/app
+CMD ["./app/app"]
--- a/tracing/applications-go/videos-api/go.mod
+++ b/tracing/applications-go/videos-api/go.mod
@ -0,0 +1,14 @@
+module example.com/playlists-api
+
+go 1.14
+
+require (
+	github.com/go-redis/redis/v8 v8.0.0-beta.7
+	github.com/julienschmidt/httprouter v1.3.0
+	github.com/opentracing/opentracing-go v1.1.1-0.20190913142402-a7454ce5950e
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/sirupsen/logrus v1.6.0
+	github.com/uber/jaeger-client-go v2.25.0+incompatible
+	github.com/uber/jaeger-lib v2.4.0+incompatible // indirect
+	go.uber.org/atomic v1.7.0 // indirect
+)
--- a/tracing/applications-go/videos-api/go.sum
+++ b/tracing/applications-go/videos-api/go.sum
@ -0,0 +1,142 @@
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+golang.org/x/sys v0.0.0-20191010194322-b09406accb47 h1:/XfQ9z7ib8eEJX2hdgFTZJ/ntt0swNk5oYBziWeTCvY=
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+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
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+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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--- a/tracing/applications-go/videos-db/appendonly.aof
+++ b/tracing/applications-go/videos-db/appendonly.aof
@ -0,0 +1,130 @@
+*2
+$6
+SELECT
+$1
+0
+*3
+$3
+set
+$11
+jM36M39MA3I
+$206
+{
+		"id" : "jM36M39MA3I",
+		"title" : "Kubernetes cluster autoscaling",
+		"imageurl" : "https://i.ytimg.com/vi/jM36M39MA3I/sddefault.jpg",
+		"url" : "https://youtu.be/jM36M39MA3I",
+		"description" : ""
+	}
+	
+*3
+$3
+set
+$11
+FfDI08sgrYY
+$202
+{
+		"id" : "FfDI08sgrYY",
+		"title" : "Kubernetes pod autoscaling",
+		"imageurl" : "https://i.ytimg.com/vi/FfDI08sgrYY/sddefault.jpg",
+		"url" : "https://youtu.be/FfDI08sgrYY",
+		"description" : ""
+	}
+	
+*3
+$3
+set
+$11
+JmCn7k0PlV4
+$195
+{
+		"id" : "JmCn7k0PlV4",
+		"title" : "Redis on Kubernetes",
+		"imageurl" : "https://i.ytimg.com/vi/JmCn7k0PlV4/sddefault.jpg",
+		"url" : "https://youtu.be/JmCn7k0PlV4",
+		"description" : ""
+	}
+	
+*3
+$3
+set
+$11
+_lpDfMkxccc
+$198
+{
+		"id" : "_lpDfMkxccc",
+		"title" : "RabbitMQ on Kubernetes",
+		"imageurl" : "https://i.ytimg.com/vi/_lpDfMkxccc/sddefault.jpg",
+		"url" : "https://youtu.be/_lpDfMkxccc",
+		"description" : ""
+	}
+	
+*3
+$3
+set
+$11
+OFgziggbCOg
+$183
+{
+		"id" : "OFgziggbCOg",
+		"title" : "Flux CD",
+		"imageurl" : "https://i.ytimg.com/vi/OFgziggbCOg/sddefault.jpg",
+		"url" : "https://youtu.be/OFgziggbCOg",
+		"description" : ""
+	}
+	
+*3
+$3
+set
+$11
+myCcJJ_Fk10
+$184
+{
+		"id" : "myCcJJ_Fk10",
+		"title" : "Drone CI",
+		"imageurl" : "https://i.ytimg.com/vi/myCcJJ_Fk10/sddefault.jpg",
+		"url" : "https://youtu.be/myCcJJ_Fk10",
+		"description" : ""
+	}
+	
+*3
+$3
+set
+$11
+2WSJF7d8dUg
+$183
+{
+		"id" : "2WSJF7d8dUg",
+		"title" : "Argo CD",
+		"imageurl" : "https://i.ytimg.com/vi/2WSJF7d8dUg/sddefault.jpg",
+		"url" : "https://youtu.be/2WSJF7d8dUg",
+		"description" : ""
+	}
+	
+*3
+$3
+set
+$11
+QThadS3Soig
+$196
+{
+		"id" : "QThadS3Soig",
+		"title" : "Kubernetes on Amazon",
+		"imageurl" : "https://i.ytimg.com/vi/QThadS3Soig/sddefault.jpg",
+		"url" : "https://youtu.be/QThadS3Soig",
+		"description" : ""
+	}
+	
+*3
+$3
+set
+$11
+eyvLwK5C2dw
+$244
+{
+		"id" : "eyvLwK5C2dw",
+		"title" : "Kubernetes on Azure",
+		"imageurl" : "https://i.ytimg.com/vi/eyvLwK5C2dw/mqdefault.jpg?sqp=CISC_PoF&rs=AOn4CLDo7kizrJozB0pxBhxL9JbyiW_EPw",
+		"url" : "https://youtu.be/eyvLwK5C2dw",
+		"description" : ""
+	}
--- a/tracing/applications-go/videos-db/configmap.yaml
+++ b/tracing/applications-go/videos-db/configmap.yaml
--- a/tracing/applications-go/videos-db/deploy.yaml
+++ b/tracing/applications-go/videos-db/deploy.yaml
@ -0,0 +1,59 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: videos-db
+  labels:
+    app: videos-db
+spec:
+  selector:
+    matchLabels:
+      app: videos-db
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: videos-db
+    spec:
+      initContainers:
+      - name: data
+        image: busybox
+        command: [ "sh", "-c" ]
+        args:
+          - |
+            cp /config/appendonly.aof /tmp/appendonly.aof
+        volumeMounts:
+        - name: data
+          mountPath: /tmp/
+        - name: config
+          mountPath: /config/
+      containers:
+      - name: videos-db
+        image: redis:6.0-alpine
+        ports:
+        - containerPort: 6379
+        volumeMounts:
+        - name: data
+          mountPath: /tmp/
+        command: [ "redis-server"]
+        args: ["--dir", "/tmp", "--appendonly", "yes"]
+      volumes:
+      - name: data
+        emptyDir: {}
+      - name: config
+        configMap:
+          name: videos-db
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: videos-db
+  labels:
+    app: videos-db
+spec:
+  type: ClusterIP
+  selector:
+    app: videos-db
+  ports:
+    - protocol: TCP
+      port: 6379
+      targetPort: 6379
--- a/tracing/applications-go/videos-web/bootstrap.min.css
+++ b/tracing/applications-go/videos-web/bootstrap.min.css
--- a/tracing/applications-go/videos-web/deploy.yaml
+++ b/tracing/applications-go/videos-web/deploy.yaml
@ -0,0 +1,62 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: videos-web
+  labels:
+    app: videos-web
+spec:
+  selector:
+    matchLabels:
+      app: videos-web
+  replicas: 1
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 0
+  template:
+    metadata:
+      labels:
+        app: videos-web
+    spec:
+      containers:
+      - name: videos-web
+        image: aimvector/jaeger-tracing:videos-web-1.0.0
+        imagePullPolicy : Always
+        ports:
+        - containerPort: 80
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: videos-web
+  labels:
+    app: videos-web
+spec:
+  type: ClusterIP
+  selector:
+    app: videos-web
+  ports:
+    - protocol: TCP
+      name: http
+      port: 80
+      targetPort: 80
+---
+apiVersion: networking.k8s.io/v1beta1
+kind: Ingress
+metadata:
+  annotations:
+    kubernetes.io/ingress.class: "nginx"
+    nginx.ingress.kubernetes.io/ssl-redirect: "false"
+    nginx.ingress.kubernetes.io/rewrite-target: /$2
+  name: videos-web
+spec:
+  rules:
+  - host: tracing.demo
+    http:
+      paths:
+      - path: /home(/|$)(.*)
+        backend:
+          serviceName: videos-web
+          servicePort: 80
+
--- a/tracing/applications-go/videos-web/dockerfile
+++ b/tracing/applications-go/videos-web/dockerfile
@ -0,0 +1,8 @@
+FROM nginx:1.19-alpine
+
+#config
+COPY ./nginx.conf /etc/nginx/nginx.conf
+
+#content
+COPY ./*.html /usr/share/nginx/html/
+COPY ./*.css /usr/share/nginx/html/
--- a/tracing/applications-go/videos-web/index.html
+++ b/tracing/applications-go/videos-web/index.html
@ -0,0 +1,96 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="utf-8" name="viewport" content="width=device-width, initial-scale=1" />
+    <link rel="stylesheet" href="bootstrap.min.css">
+    <title>Video Catalog</title>
+</head>
+
+<body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+
+    <article>
+      <div  ng-app="videos" ng-controller="videosController" class="container">
+        <div class="row">
+          <div id="accordion">
+
+            <div id="{{ l.id }}" ng-repeat="l in playlist" class="card">
+
+              <div class="card-header" id="heading{{ l.id }}">
+                <h5 class="mb-0" style="text-align: center;">
+                  <button class="btn btn-link" data-toggle="collapse" data-target="#collapse{{ l.id }}" aria-expanded="true"
+                    aria-controls="collapse{{ l.id }}">
+                    {{ l.name }}
+                  </button>
+                </h5>
+              </div>
+          
+              <div id="collapse{{ l.id }}" class="collapse show" aria-labelledby="heading{{ l.id }}" data-parent="#accordion">
+                <div class="card-body">
+                   
+                  <div class="row">
+                  <div class="col card"  ng-repeat="v in l.videos" style="width: 18rem;">
+                    <img class="card-img-top" src="{{ v.imageurl }}" alt="Card image cap">
+                    <div class="card-body">
+                      <h5 class="card-title">{{ v.title }}</h5>
+                      <p class="card-text">{{ v.description }}</p>
+                      <a href="{{ v.url }}" class="btn btn-primary">Watch</a>
+                    </div>
+                  </div>
+                </div>
+
+
+                </div>
+              </div>
+            </div>
+
+
+          </div>
+        </div>
+
+      </div>
+    </article>
+
+    <hr />
+
+    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
+
+    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"
+        integrity="sha384-uefMccjFJAIv6A+rW+L4AHf99KvxDjWSu1z9VI8SKNVmz4sk7buKt/6v9KI65qnm"
+        crossorigin="anonymous"></script>
+
+    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>
+
+    <script>
+       
+        var model = {
+            playlist: [],
+        };
+
+        var playlistApiUrl = "";
+        if (location.hostname == "localhost"){
+          playlistApiUrl = "http://localhost:81/"
+        } else {
+          playlistApiUrl = "http://" + location.hostname + "/api/playlists"
+        }
+
+        var app = angular.module('videos', []);
+        app.controller('videosController', function ($scope, $http) {
+
+            $http.get(playlistApiUrl)
+                .then(function (response) {
+
+                    console.log(response);
+                    //$scope.model = model;
+                    for (i = 0; i < response.data.length; ++i) {
+                        model.playlist.push(response.data[i]);
+                    }
+                    $scope.playlist = response.data;
+                });
+        });
+    
+    </script>
+</body>
+
+</html>
--- a/tracing/applications-go/videos-web/nginx.conf
+++ b/tracing/applications-go/videos-web/nginx.conf
@ -0,0 +1,35 @@
+user  nginx;
+worker_processes  1;
+
+error_log  /var/log/nginx/error.log warn;
+pid        /var/run/nginx.pid;
+
+events {
+    worker_connections  1024;
+}
+
+http {
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
+                      '$status $body_bytes_sent "$http_referer" '
+                      '"$http_user_agent" "$http_x_forwarded_for"';
+    access_log  /var/log/nginx/access.log  main;
+    server {
+        listen 80;
+         
+         location / {
+            gzip off;
+            root /usr/share/nginx/html/;
+            index  index.html;
+            #index  index-v2.html;
+        }
+        
+        location ~* \.(js|jpg|png|css)$ {
+            root /usr/share/nginx/html/;
+        }
+    } 
+    sendfile        on;
+    keepalive_timeout  65;
+}
--- a/tracing/docker-compose.yaml
+++ b/tracing/docker-compose.yaml
@ -0,0 +1,64 @@
+version: "3.4"
+services:
+  videos-web:
+    container_name: videos-web
+    image: aimvector/jaeger-tracing:videos-web-1.0.0
+    build:
+      context: ./applications-go/videos-web
+    ports:
+      - 80:80
+    networks:
+    - tracing
+  playlists-api:
+    container_name: playlists-api
+    image: aimvector/jaeger-tracing:playlists-api-1.0.0
+    build:
+      context: ./applications-go/playlists-api
+    environment:
+    - "ENVIRONMENT=DEBUG"
+    - "REDIS_HOST=playlists-db"
+    - "REDIS_PORT=6379"
+    ports:
+    - 81:10010
+    networks:
+    - tracing
+  videos-api:
+    container_name: videos-api
+    image: aimvector/jaeger-tracing:videos-api-1.0.0
+    build:
+      context: ./applications-go/videos-api
+    environment:
+    - "ENVIRONMENT=DEBUG"
+    - "REDIS_HOST=videos-db"
+    - "REDIS_PORT=6379"
+    ports:
+    - 82:10010
+    networks:
+    - tracing
+  videos-db:
+    container_name: videos-db
+    image: redis:6.0-alpine
+    command: [ "redis-server" , "--dir", "/tmp", "--appendonly", "yes"]
+    volumes:
+      - ./applications-go/videos-db/appendonly.aof:/tmp/appendonly.aof
+    networks:
+    - tracing
+  playlists-db:
+    container_name: playlists-db
+    image: redis:6.0-alpine
+    command: [ "redis-server" , "--dir", "/tmp", "--appendonly", "yes"]
+    volumes:
+      - ./applications-go/playlists-db/appendonly.aof:/tmp/appendonly.aof
+    networks:
+    - tracing
+  jaeger:
+    container_name: jaeger
+    image: jaegertracing/all-in-one:latest
+    networks:
+    - tracing
+    ports:
+    - 16686:16686
+    - 14269:14269
+networks: 
+  tracing:
+    name: tracing