Merge branch 'master' into linkerd-jaeger

2025-06-06 17:01:30 +00:00 · 2021-04-15 14:31:37 +10:00 · 2021-04-15 14:31:37 +10:00 · 9223348c32
commit 9223348c32
parent f9ba0232d4 dcd35c6b70
32 changed files with 2137 additions and 2 deletions
--- a/golang/introduction/part-4.commandline/dockerfile
+++ b/golang/introduction/part-4.commandline/dockerfile
@ -0,0 +1,17 @@
+FROM golang:1.15-alpine as dev
+
+WORKDIR /work
+
+# FROM golang:1.15-alpine as build
+
+# WORKDIR /videos
+# COPY ./videos/* /videos/
+# RUN go build -o videos
+
+
+# FROM alpine as runtime 
+# COPY --from=build /videos/videos /usr/local/bin/videos
+# COPY ./videos/videos.json /
+# COPY run.sh /
+# RUN chmod +x /run.sh
+# ENTRYPOINT [ "./run.sh" ]
--- a/golang/introduction/part-4.commandline/readme.md
+++ b/golang/introduction/part-4.commandline/readme.md
@ -0,0 +1,416 @@
+# Introduction to Go: Command Line
+
+Command line apps are a fundamental part of software development <br/>
+
+Go has a built in Commandline parser package. The package can be found [here](https://golang.org/pkg/flag/) <br/>
+We simply have to import the `flag` package: 
+
+```
+import (
+  "flag"
+)
+```
+
+[In part 1](../readme.md), we covered the fundamentals of writing basic Go <br/>
+[In part 2](../part-2.json/readme.md), we've learn how to use basic data structures like `json` so we can send\receive data. <br/>
+[Part 3](../part-3.http/readme.md) was about exposing data via a Web server.
+
+We'll be combining these techniques so we can serve our `videos` data over a commandline application.
+
+As always, let's start with our `dockerfile` , `main.go` and `videos.go` we created in Part 2
+
+## Dev Environment
+
+The same as Part 1+2+3, we start with a [dockerfile](./dockerfile) where we declare our version of `go`.
+
+```
+cd golang\introduction\part-4.commandline
+
+docker build --target dev . -t go
+docker run -it -v ${PWD}:/work go sh
+go version
+```
+
+## Create our App
+
+Create a new directory that holds defines our `repository` and holds our `module`
+
+```
+mkdir videos
+cd videos
+```
+
+* Define a module path
+
+```
+# create a go module file
+
+go mod init videos
+
+```
+
+## Create our base code
+
+We start out all our applications with a `main.go` defining our `package`, declaring our `import` dependencies <br/>
+and our entrypoint `main()` function
+
+```
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Hello, world.")
+}
+```
+
+## Create our Videos app
+
+Firstly, we create a seperate code file `videos.go` that deals with our YouTube videos <br/>
+
+The `videos.go` file defines what a video `struct` looks like, a `getVideos()` function to retrieve <br/>
+videos list as a slice and a `saveVideos()` function to save videos to a file locally. <br/>
+
+Let's copy the following content from Part 2 and create `videos.go` :
+
+We want `videos.go` to be part of package main:
+
+```
+package main
+
+```
+
+We import 2 packages, 1 for reading and writing files, and another for dealing with `json`
+
+```
+import (
+	"io/ioutil"
+	"encoding/json"
+)
+
+```
+
+Then we define what a video `struct` looks like:
+
+```
+
+type video struct {
+	Id string  
+	Title string  
+	Description string 
+	Imageurl string 
+	Url string 
+}
+
+```
+
+We have a function for retrieving `video` objects as a list of type `slice` :
+
+```
+
+func getVideos()(videos []video){
+	
+	fileBytes, err := ioutil.ReadFile("./videos.json")
+
+	if err != nil {
+		panic(err)
+	}
+
+	err = json.Unmarshal(fileBytes, &videos)
+
+	if err != nil {
+		panic(err)
+	}
+
+	return videos
+}
+
+```
+
+We also need to copy our `videos.json` file which contains our video data. <br/>
+
+And finally, we have a function that accepts a list of type `slice` and stores the videos to a local file
+
+```
+func saveVideos(videos []video)(){
+
+  videoBytes, err  := json.Marshal(videos)
+  if err != nil {
+		panic(err)
+	}
+
+	err = ioutil.WriteFile("./videos.json", videoBytes, 0644)
+  if err != nil {
+		panic(err)
+	}
+
+}
+```
+
+## Flag Package 
+
+https://golang.org/pkg/flag/
+
+Package flag implements command-line flag parsing.
+So we can run our videos app and pass it inputs like any other CLI.
+
+Let's build a CLI tool that users our `getVideos()` and `saveVideos` functions.
+
+To get all videos, perhaps we'd like a command
+```
+# get all videos
+videos get --all
+
+# get video by ID
+videos get -id <video-id>
+
+# add a video to our list
+videos add -id -title -url -imageurl -desc 
+
+
+```
+To start, we import package `flag`
+
+```
+import (
+	"flag"
+	"fmt"
+)
+```
+
+
+Let's define our subcommands in `main.go` :
+
+```
+    //'videos get' subcommand
+    getCmd := flag.NewFlagSet("get", flag.ExitOnError)
+```
+
+`videos get` command will need two inputs, `--all` if the user wants to return all videos, or `--id` if the user only wants a specific video
+
+```
+  // inputs for `videos get` command
+  getAll := getCmd.Bool("all", false, "Get all videos")
+  getID := getCmd.String("id", "", "YouTube video ID")
+```
+
+`videos add` command will take a bit more inputs to be able to add a video to our storage.
+```
+  addCmd := flag.NewFlagSet("add", flag.ExitOnError)
+
+  addID := addCmd.String("id", "", "YouTube video ID")
+  addTitle := addCmd.String("title", "", "YouTube video Title")
+  addUrl := addCmd.String("url", "", "YouTube video URL")
+  addImageUrl := addCmd.String("imageurl", "", "YouTube video Image URL")
+  addDesc := addCmd.String("desc", "", "YouTube video description")
+
+
+```
+
+When a user runs our videos CLI tool, we may need to validate that 
+our application receives the right subcommands. So lets ensure a simple validation to check if the user has passed a subcommand
+
+To check the arguments passed to our CLI, we use the ["os"](https://golang.org/pkg/os/) package. Check the Args variable, it holds usefull information passed to our application including its name.
+`var Args []string`
+
+We can do a simple check by ensuring the length of `os.Args` is atleast 2.
+
+We firstly need to add `os` to our import section </br>
+Followed by our check:
+
+```
+if len(os.Args) < 2 {
+        fmt.Println("expected 'get' or 'add' subcommands")
+        os.Exit(1)
+  }
+```
+
+## Handling our subcommands
+
+So to handle each sub command like `get` and `add`, we add a simple
+`switch` statement that can branch into different pathways of execution,
+based on a variables content.
+
+Let's take a look at this simple `switch` statement:
+
+```
+//look at the 2nd argument's value
+switch os.Args[1] {
+  case "get": // if its the 'get' command
+    //hande get here
+  case "add": // if its the 'add' command
+    //hande add here
+  default: // if we don't understand the input
+}
+```
+
+Let's create seperate handler functions for each sub command to keep our code tidy:
+
+```
+func HandleGet(getCmd *flag.FlagSet, all *bool, id *string){
+}
+
+func HandleAdd(addCmd *flag.FlagSet,id *string, title *string, url *string, imageUrl *string, description *string ){
+}
+```
+
+Now that we have seperate functions for each subcommand, we can take appropriate actions in each. Let's firstly parse the command flags for each subcommand:
+
+This allows us to parse everything after the `videos <subcommand>` arguments:
+
+```
+getCmd.Parse(os.Args[2:])
+```
+
+## Input Validation
+
+For our `HandleGet` function, let's validate input to ensure its correct.
+
+```
+  if *all == false && *id == "" {
+    fmt.Print("id is required or specify --all for all videos")
+    getCmd.PrintDefaults()
+    os.Exit(1)
+  }
+```
+
+Let's handle the scenario if user passing `--all` flag:
+
+```
+if *all {
+		//return all videos
+		videos := getVideos()
+		
+		fmt.Printf("ID \t Title \t URL \t ImageURL \t Description \n")
+		for _, video := range videos {
+			fmt.Printf("%v \t %v \t %v \t %v \t %v \n",video.Id, video.Title, video.Url, video.Imageurl,video.Description)
+		}
+
+		return
+}
+```
+
+Let's handle when user is searching for a video by ID
+
+```
+if *id != "" {
+		videos := getVideos()
+		id := *id
+		for _, video := range videos {
+			if id == video.Id {
+				fmt.Printf("ID \t Title \t URL \t ImageURL \t Description \n")
+				fmt.Printf("%v \t %v \t %v \t %v \t %v \n",video.Id, video.Title, video.Url, video.Imageurl,video.Description)
+
+			}
+		}
+} 
+```
+
+## Parsing multiple fields
+
+For our `HandleAdd` function, we need to validate multiple inputs, create a `video` struct, append it to the existing video list and save it back to file
+
+Let's create a `ValidateVideo()` function with similar inputs to our `HandleAdd()`:
+
+```
+func ValidateVideo(addCmd *flag.FlagSet,id *string, title *string, url *string, imageUrl *string, description *string ){
+}
+
+```
+
+Let's simply validate all fields since they are all required:
+
+```
+if *id == "" || *title == "" || *url == "" || *imageUrl == "" || *description == "" {
+		fmt.Print("all fields are required for adding a video")
+		addCmd.PrintDefaults()
+		os.Exit(1)
+	}
+```
+
+And we can now call this function in our add function:
+
+```
+ValidateVideo(addCmd, id,title,url, imageUrl, description)
+```
+
+## Adding our video
+
+Now that we have some basic validation, not perfect, but good enough to get started, let's add our video to the existing file.
+
+Define a video struct with the CLI input:
+
+```
+	video := video{
+		Id: *id,
+		Title: *title,
+		Description: *description,
+		Imageurl: *imageUrl, 
+		Url: *url, 
+	}
+```
+
+Get the existing videos:
+
+```
+videos := getVideos()
+```
+
+Append our video to the list:
+
+```
+videos = append(videos,video)
+```
+
+Save the new updated video list:
+
+```
+saveVideos(videos)
+```
+
+# Build our Docker container
+
+Let's uncomment all the build lines in the `dockerfile`
+Full `dockerfile` : 
+
+```
+FROM golang:1.15-alpine as dev
+
+WORKDIR /work
+
+FROM golang:1.15-alpine as build
+
+WORKDIR /videos
+COPY ./videos/* /videos/
+RUN go build -o videos
+
+
+FROM alpine as runtime 
+COPY --from=build /videos/videos /usr/local/bin/videos
+COPY ./videos/videos.json /
+COPY run.sh /
+RUN chmod +x /run.sh
+ENTRYPOINT [ "./run.sh" ]
+```
+
+For our entrypoint, we need to create a shell script to accept all the arguments:
+
+Let's create a script called `run.sh`
+
+```
+#!/bin/sh
+
+videos $@
+
+```
+
+Build :
+```
+cd golang\introduction\part-4.commandline
+docker build . -t videos
+```
+
+Run :
+```
+docker run -it videos get --help
+```
--- a/golang/introduction/part-4.commandline/run.sh
+++ b/golang/introduction/part-4.commandline/run.sh
@ -0,0 +1,3 @@
+#!/bin/sh
+
+videos $@
--- a/golang/introduction/part-4.commandline/videos/go.mod
+++ b/golang/introduction/part-4.commandline/videos/go.mod
@ -0,0 +1,3 @@
+module videos
+
+go 1.15
--- a/golang/introduction/part-4.commandline/videos/main.go
+++ b/golang/introduction/part-4.commandline/videos/main.go
@ -0,0 +1,111 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+)
+
+func main() {
+	
+	//'videos get' subcommand
+  getCmd := flag.NewFlagSet("get", flag.ExitOnError)
+
+	// inputs for `videos get` command
+  getAll := getCmd.Bool("all", false, "Get all videos")
+  getID := getCmd.String("id", "", "YouTube video ID")
+
+	//'videos add' subcommand
+	addCmd := flag.NewFlagSet("add", flag.ExitOnError)
+
+	// inputs for `videos add` command
+	addID := addCmd.String("id", "", "YouTube video ID")
+  addTitle := addCmd.String("title", "", "YouTube video Title")
+  addUrl := addCmd.String("url", "", "YouTube video URL")
+  addImageUrl := addCmd.String("imageurl", "", "YouTube video Image URL")
+  addDesc := addCmd.String("desc", "", "YouTube video description")
+
+	if len(os.Args) < 2 {
+		fmt.Println("expected 'get' or 'add' subcommands")
+		os.Exit(1)
+  }
+
+	//look at the 2nd argument's value
+	switch os.Args[1] {
+		case "get": // if its the 'get' command
+			HandleGet(getCmd, getAll, getID)
+		case "add": // if its the 'add' command
+			HandleAdd(addCmd, addID,addTitle,addUrl, addImageUrl, addDesc)
+		default: // if we don't understand the input
+	}
+
+
+}
+
+func HandleGet(getCmd *flag.FlagSet, all *bool, id *string){
+
+	getCmd.Parse(os.Args[2:])
+
+	if *all == false && *id == "" {
+    fmt.Print("id is required or specify --all for all videos")
+    getCmd.PrintDefaults()
+    os.Exit(1)
+  }
+
+	if *all {
+		//return all videos
+		videos := getVideos()
+		
+		fmt.Printf("ID \t Title \t URL \t ImageURL \t Description \n")
+		for _, video := range videos {
+			fmt.Printf("%v \t %v \t %v \t %v \t %v \n",video.Id, video.Title, video.Url, video.Imageurl,video.Description)
+		}
+
+		return
+	}
+
+	if *id != "" {
+		videos := getVideos()
+		id := *id
+		for _, video := range videos {
+			if id == video.Id {
+				fmt.Printf("ID \t Title \t URL \t ImageURL \t Description \n")
+				fmt.Printf("%v \t %v \t %v \t %v \t %v \n",video.Id, video.Title, video.Url, video.Imageurl,video.Description)
+			}
+		}
+	} 
+
+
+
+}
+
+func ValidateVideo(addCmd *flag.FlagSet,id *string, title *string, url *string, imageUrl *string, description *string ){
+
+	addCmd.Parse(os.Args[2:])
+
+	if *id == "" || *title == "" || *url == "" || *imageUrl == "" || *description == "" {
+		fmt.Print("all fields are required for adding a video")
+		addCmd.PrintDefaults()
+		os.Exit(1)
+	}
+
+}
+
+func HandleAdd(addCmd *flag.FlagSet,id *string, title *string, url *string, imageUrl *string, description *string ){
+
+	ValidateVideo(addCmd, id,title,url, imageUrl, description)
+
+	video := video{
+		Id: *id,
+		Title: *title,
+		Description: *description,
+		Imageurl: *imageUrl, 
+		Url: *url, 
+	}
+
+	videos := getVideos()
+	videos = append(videos,video)
+
+	saveVideos(videos)
+
+}
--- a/golang/introduction/part-4.commandline/videos/videos
+++ b/golang/introduction/part-4.commandline/videos/videos
--- a/golang/introduction/part-4.commandline/videos/videos.go
+++ b/golang/introduction/part-4.commandline/videos/videos.go
@ -0,0 +1,45 @@
+package main
+
+import (
+	"io/ioutil"
+	"encoding/json"
+)
+
+type video struct {
+	Id string  
+	Title string  
+	Description string 
+	Imageurl string 
+	Url string 
+}
+
+func getVideos()(videos []video){
+	
+	fileBytes, err := ioutil.ReadFile("./videos.json")
+
+	if err != nil {
+		panic(err)
+	}
+
+	err = json.Unmarshal(fileBytes, &videos)
+
+	if err != nil {
+		panic(err)
+	}
+
+	return videos
+}
+
+func saveVideos(videos []video)(){
+
+  videoBytes, err  := json.Marshal(videos)
+  if err != nil {
+		panic(err)
+	}
+
+	err = ioutil.WriteFile("./videos.json", videoBytes, 0644)
+  if err != nil {
+		panic(err)
+	}
+
+}
--- a/golang/introduction/part-4.commandline/videos/videos.json
+++ b/golang/introduction/part-4.commandline/videos/videos.json
@ -0,0 +1,16 @@
+[
+  {
+    "Id": "QThadS3Soig",
+    "Title": "Kubernetes on Amazon",
+    "Description": "",
+    "Imageurl": "https://i.ytimg.com/vi/QThadS3Soig/sddefault.jpg",
+    "Url": "https://youtu.be/QThadS3Soig"
+  },
+  {
+    "Id": "eyvLwK5C2dw",
+    "Title": "Kubernetes on Azure",
+    "Description": "",
+    "Imageurl": "https://i.ytimg.com/vi/eyvLwK5C2dw/mqdefault.jpg?sqp=CISC_PoF\u0026rs=AOn4CLDo7kizrJozB0pxBhxL9JbyiW_EPw",
+    "Url": "https://youtu.be/eyvLwK5C2dw"
+  }
+]
--- a/storage/redis/kubernetes/redis/redis-statefulset.yaml
+++ b/storage/redis/kubernetes/redis/redis-statefulset.yaml
@ -22,6 +22,7 @@ spec:
            cp /tmp/redis/redis.conf /etc/redis/redis.conf
            
            echo "finding master..."
+            MASTER_FDQN=`hostname  -f | sed -e 's/redis-[0-9]\./redis-0./'`
            if [ "$(redis-cli -h sentinel -p 5000 ping)" != "PONG" ]; then
              echo "master not found, defaulting to redis-0"

@ -29,7 +30,7 @@ spec:
                echo "this is redis-0, not updating config..."
              else
                echo "updating redis.conf..."
-                echo "slaveof redis-0.redis.redis.svc.cluster.local 6379" >> /etc/redis/redis.conf
+                echo "slaveof $MASTER_FDQN 6379" >> /etc/redis/redis.conf
              fi
            else
              echo "sentinel found, finding master"
@ -82,4 +83,4 @@ spec:
    targetPort: 6379
    name: redis
  selector:
-    app: redis
+    app: redis
--- a/tracing/README.md
+++ b/tracing/README.md
@ -0,0 +1,144 @@
+# 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:
+
+```
+cd tracing
+
+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 +1,192 @@
+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 +1,151 @@
+package main
+
+import (
+	"net/http"
+	"github.com/julienschmidt/httprouter"
+	log "github.com/sirupsen/logrus"
+	"github.com/go-redis/redis/v8"
+	"fmt"
+	"context"
+	"time"
+	"strings"
+	"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 delay = os.Getenv("DELAY")
+
+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)
+
+		if strings.Contains(video, "jM36M39MA3I") && delay == "true" {
+					time.Sleep(6 * time.Second)
+		}
+
+		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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+google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
+google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
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+google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+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=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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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 +1,66 @@
+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
+  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
+  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"
+    #- "DELAY=true"
+    #- "FLAKY=true"
+    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
+  jaeger:
+    container_name: jaeger
+    image: jaegertracing/all-in-one:latest
+    networks:
+    - tracing
+    ports:
+    - 16686:16686
+    - 14269:14269
+networks: 
+  tracing:
+    name: tracing