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Swift Cloud Workshop - Swift Microservices

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Chris Bailey

The document discusses deploying Swift microservices with Docker and Kubernetes. It covers building a Swift microservice into a Docker container, deploying the container with Kubernetes, and integrating resiliency features like health checks, circuit breakers, and monitoring. Key points include using Dockerfiles to package the application, Helm charts to deploy to Kubernetes, liveness probes to check service health, and circuit breakers to handle failures of downstream services.

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Deploying Swift
 With Docker and Kubernetes Swift Cloud Workshop 3
 February 23rd, 2018 Chris Bailey
 (@Chris__Bailey)
: Key Technologies
: Key Technologies Container
: Key Technologies Container Orchestration
: Key Technologies Container Orchestration Package and Deploy
: Key Technologies Container Orchestration MonitoringPackage and Deploy
: Key Technologies Container Orchestration Monitoring Fault TolerancePackage and Deploy
Building Swift Microservices
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Kitura
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Kitura import Kitura import LoggerAPI import CloudEnvironment import KituraContracts import Health public let projectPath = ConfigurationManager.BasePath.project.path public let health = Health() public class App { let router = Router() let cloudEnv = CloudEnv() public init() throws { } func postInit() throws { initializeMetrics(app: self) initializeHealthRoutes(app: self) } public func run() throws { try postInit() Kitura.addHTTPServer(onPort: cloudEnv.port, with: router) Kitura.run() } }
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore FROM ibmcom/swift-ubuntu-runtime:4.0 # We can replace this port with what the user wants EXPOSE 8080 # Install system level packages # RUN apt-get update && apt-get dist-upgrade -y # Add utils files ADD https://raw.githubusercontent.com/IBM-Swift/swift-ubuntu- docker/master/utils/run-utils.sh /swift-utils/run-utils.sh ADD https://raw.githubusercontent.com/IBM-Swift/swift-ubuntu- docker/master/utils/common-utils.sh /swift-utils/common-utils.sh RUN chmod -R 555 /swift-utils # Bundle application source & binaries COPY . /swift-project # Command to start Swift application CMD [ "sh", "-c", "cd /swift-project && .build-ubuntu/release/ helium" ]
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore Dockerfile Dockerfile-tools
$ docker build -t <your username>/swift-app .

$ docker build -t <your username>/swift-app .
 $ docker run -p 49160:8080 -d <your username>/swift-app
$ docker build -t <your username>/swift-app .
 $ docker run -p 49160:8080 -d <your username>/swift-app
$ docker build -t <your username>/swift-app .
 $ docker run -p 49160:8080 -d <your username>/swift-app
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml HELM CHARTS
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml HELM CHARTS apiVersion: v1 description: A Helm chart for Kubernetes name: swift-app version: 1.0.0
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml HELM CHARTS apiVersion: extensions/v1beta1 kind: Deployment metadata: name: “{{ .Chart.Name }}-deployment" labels: chart: “{{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}’ spec: replicas: “{{ .Values.replicaCount }}” revisionHistoryLimit: “{{ .Values.revisionHistoryLimit }}” template: metadata: labels: app: “{{ .Chart.Name }}-selector" version: "current" spec: containers: - name: “{{ .Chart.Name }}” image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}" imagePullPolicy: Always livenessProbe: httpGet: path: /health port: {{ .Values.service.servicePort }} initialDelaySeconds: {{.Values.livenessProbe.initialDelaySeconds}} periodSeconds: {{ .Values.livenessProbe.periodSeconds}} resources: requests: cpu: "{{ .Values.image.resources.requests.cpu }}" memory: "{{ .Values.image.resources.requests.memory }}" env: - name: PORT
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml HELM CHARTS apiVersion: autoscaling/v2beta1 kind: HorizontalPodAutoscaler metadata: name: "{{ .Chart.Name }}-hpa-policy" namespace: default spec: scaleTargetRef: apiVersion: apps/v1beta1 kind: Deployment name: "{{ .Chart.Name }}-deployment" minReplicas: {{ .Values.hpa.minReplicas }} maxReplicas: {{ .Values.hpa.maxReplicas }} metrics: - type: Resource resource: name: cpu targetAverageUtilization: {{.Values.hpa.metrics.cpu.targetAverageUtilization}} - type: Resource resource: name: memory targetAverageUtilization: {{.Values.hpa.metrics.memory.targetAverageUtilization}} {{ end }}
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml HELM CHARTS apiVersion: v1 kind: Service metadata: annotations: prometheus.io/scrape: 'true' name: "{{ .Chart.Name }}-service" labels: chart: "{{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}" spec: type: {{ .Values.service.type }} ports: - name: http port: {{ .Values.service.servicePort }} selector: app: "{{ .Chart.Name }}-selector"
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml HELM CHARTS replicaCount: 1 revisionHistoryLimit: 1 image: repository: registry.ng.bluemix.net/replace-namespace/swift-app tag: v1.0.0 pullPolicy: Always resources: requests: cpu: 200m memory: 300Mi livenessProbe: initialDelaySeconds: 3000 periodSeconds: 1000 service: name: Node type: NodePort servicePort: 8080 hpa: enabled: false minReplicas: 1 maxReplicas: 2 metrics: cpu: targetAverageUtilization: 70 memory: targetAverageUtilization: 70 services: base: enabled: false replicaCount: 1 image: tag : v0.9.9 weight: 100 prometheus: enabled: false
$ helm package ./chart/swift-app
$ helm package ./chart/swift-app $ helm install ./swift-app-1.0.0.tgz
$ helm package ./chart/swift-app $ helm install ./swift-app-1.0.0.tgz
$ helm package ./chart/swift-app $ helm install ./swift-app-1.0.0.tgz
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml Jenkinsfile
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml Jenkinsfile #!groovy @Library('MicroserviceBuilder') _ microserviceBuilderPipeline { image = ‘swift-app’ }
Integrating with
 Kubernetes
• Checks status of service • Requires /health endpoint providing data
 • Restarts service if not 200 OK • Restarts service if no response
 Microservice Health: Liveness Probes
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Kitura
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Kitura import Kitura import LoggerAPI import CloudEnvironment import KituraContracts import Health public let projectPath = ConfigurationManager.BasePath.project.path public let health = Health() public class App { let router = Router() let cloudEnv = CloudEnv() public init() throws { } func postInit() throws { initializeMetrics(app: self) initializeHealthRoutes(app: self) } public func run() throws { try postInit() Kitura.addHTTPServer(onPort: cloudEnv.port, with: router) Kitura.run() } }
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift Tests/* Package.swift README.md .gitignore Kitura import LoggerAPI func initializeHealthRoutes(app: App) { app.router.get("/health") { request, response, _ in let result = health.status.toSimpleDictionary() if health.status.state == .UP { try response.send(json: result).end() } else { try response.status(.serviceUnavailable).send(json: result).end() } } }
• Provides “fault tolerance” to an application
 • Enables handling of failed downstream services • Prevents repeated calls to failed services • Provides alternative fallback function
 • Integrates with monitoring Microservice Resilience: Hystrix and CircuitBreaker
• Provides “fault tolerance” to an application
 • Enables handling of failed downstream services • Prevents repeated calls to failed services • Provides alternative fallback function
 • Integrates with monitoring Microservice Resilience: Hystrix and CircuitBreaker
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift
 Tests/* Package.swift README.md .gitignore Kitura breaker = CircuitBreaker( name: "breaker",
 timeout: 10000, maxFailures: 3, rollingWindow: 60000, command: myCommand, fallback: myFallback) func myFallback(err: BreakerError, msg: String) { Log.verbose("Error: (error)") Log.verbose("Message: (msg)") } func myCommand(invocation: Invocation<(String), String>) {
 
 } breaker.run(commandArgs: , fallbackArgs:) CircuitBreaker
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift
 Tests/* Package.swift README.md .gitignore Kitura breaker = CircuitBreaker( name: "breaker",
 timeout: 10000, maxFailures: 3, rollingWindow: 60000, command: myCommand, fallback: myFallback) func myFallback(err: BreakerError, msg: String) { Log.verbose("Error: (error)") Log.verbose("Message: (msg)") } func myCommand(invocation: Invocation<(String), String>) {
 
 } breaker.run(commandArgs: , fallbackArgs:) CircuitBreaker
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift
 Tests/* Package.swift README.md .gitignore Kitura breaker = CircuitBreaker( name: "breaker",
 timeout: 10000, maxFailures: 3, rollingWindow: 60000, command: myCommand, fallback: myFallback) func myFallback(err: BreakerError, msg: String) { Log.verbose("Error: (error)") Log.verbose("Message: (msg)") } func myCommand(invocation: Invocation<(String), String>) {
 
 } breaker.run(commandArgs: , fallbackArgs:) CircuitBreaker
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift
 Tests/* Package.swift README.md .gitignore Kitura breaker = CircuitBreaker( name: "breaker",
 timeout: 10000, maxFailures: 3, rollingWindow: 60000, command: myCommand, fallback: myFallback) func myFallback(err: BreakerError, msg: String) { Log.verbose("Error: (error)") Log.verbose("Message: (msg)") } func myCommand(invocation: Invocation<(String), String>) {
 
 } breaker.run(commandArgs: , fallbackArgs:) CircuitBreaker
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift
 Tests/* Package.swift README.md .gitignore Kitura let circuitParameters = CircuitParameters( timeout: 2000, maxFailures: 2, fallback: myFallback) let request = RestRequest(method: .get, url: "/hello") request.circuitParameters = circuitParameters SwiftyRequest
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift
 Tests/* Package.swift README.md .gitignore Kitura let circuitParameters = CircuitParameters( timeout: 2000, maxFailures: 2, fallback: myFallback) let request = RestRequest(method: .get, url: "/hello") request.circuitParameters = circuitParameters SwiftyRequest
• Collects data from each enabled service
 • Requires /metrics endpoint providing data
 • Provides storage and correlation capabilities • Provide customisable dashboard
 • Integrates with Graphana, Graphite, etc Microservice Metrics: Prometheus
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Kitura
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift
 Tests/* Package.swift README.md .gitignore Kitura import Kitura import LoggerAPI import CloudEnvironment import KituraContracts import Health public let projectPath = ConfigurationManager.BasePath.project.path public let health = Health() public class App { let router = Router() let cloudEnv = CloudEnv() public init() throws { } func postInit() throws { initializeMetrics(app: self) initializeHealthRoutes(app: self) } public func run() throws { try postInit() Kitura.addHTTPServer(onPort: cloudEnv.port, with: router) Kitura.run() } }
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift Sources/Applicaton/Metrics.swift Tests/* Package.swift README.md .gitignore Kitura import Kitura import SwiftMetrics import SwiftMetricsDash import SwiftMetricsPrometheus import LoggerAPI var swiftMetrics: SwiftMetrics? var swiftMetricsDash: SwiftMetricsDash? var swiftMetricsPrometheus: SwiftMetricsPrometheus? func initializeMetrics(router: Router) { do { let metrics = try SwiftMetrics() let dashboard = try SwiftMetricsDash(swiftMetricsInstance: metrics, endpoint: router) let prometheus = try SwiftMetricsPrometheus(swiftMetricsInstance: metrics, endpoint: router) swiftMetrics = metrics swiftMetricsDash = dashboard swiftMetricsPrometheus = prometheus Log.info("Initialized metrics.") } catch { Log.warning("Failed to initialize metrics: (error)") } }
Swift Cloud Workshop - Swift Microservices
Swift Cloud Workshop - Swift Microservices
• ‘SwiftMetricsDash’ provides self-hosted monitoring
 • Inbound and Outbound request performance • Resource monitoring • ++ Dispatch queue monitoring
 • ++ profiling and flame graphs Deep Analysis: ‘SwiftMetricsDash’
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift Sources/Applicaton/Metrics.swift Tests/* Package.swift README.md .gitignore Kitura import Kitura import SwiftMetrics import SwiftMetricsDash import SwiftMetricsPrometheus import LoggerAPI var swiftMetrics: SwiftMetrics? var swiftMetricsDash: SwiftMetricsDash? var swiftMetricsPrometheus: SwiftMetricsPrometheus? func initializeMetrics(router: Router) { do { let metrics = try SwiftMetrics() let dashboard = try SwiftMetricsDash(swiftMetricsInstance: metrics, endpoint: router) let prometheus = try SwiftMetricsPrometheus(swiftMetricsInstance: metrics, endpoint: router) swiftMetrics = metrics swiftMetricsDash = dashboard swiftMetricsPrometheus = prometheus Log.info("Initialized metrics.") } catch { Log.warning("Failed to initialize metrics: (error)") } }
func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift Sources/Applicaton/Metrics.swift Tests/* Package.swift README.md .gitignore Kitura import Kitura import SwiftMetrics import SwiftMetricsDash import SwiftMetricsPrometheus import LoggerAPI var swiftMetrics: SwiftMetrics? var swiftMetricsDash: SwiftMetricsDash? var swiftMetricsPrometheus: SwiftMetricsPrometheus? func initializeMetrics(router: Router) { do { let metrics = try SwiftMetrics() let dashboard = try SwiftMetricsDash(swiftMetricsInstance: metrics, endpoint: router) let prometheus = try SwiftMetricsPrometheus(swiftMetricsInstance: metrics, endpoint: router) swiftMetrics = metrics swiftMetricsDash = dashboard swiftMetricsPrometheus = prometheus Log.info("Initialized metrics.") } catch { Log.warning("Failed to initialize metrics: (error)") } }
‘SwiftMetricsDash’
$ kitura init$ kitura init
DEMO
Common Microservices Approach
Config Fault Tolerance Health Check Health Metrics JWT Propagation externalize configuration to improve portability build robust behavior to cope with unexpected failures common format to determine service availability common REST endpoints for monitoring service health interoperable authentication and role- based access control
Config Fault Tolerance Health Check Health Metrics JWT Propagation externalize configuration to improve portability build robust behavior to cope with unexpected failures common format to determine service availability common REST endpoints for monitoring service health interoperable authentication and role- based access control CloudEnvironment CircuitBreaker Health SwiftMetricsPrometheus Swift-JWT
Config Fault Tolerance Health Check Health Metrics JWT Propagation externalize configuration to improve portability build robust behavior to cope with unexpected failures common format to determine service availability common REST endpoints for monitoring service health interoperable authentication and role- based access control CloudEnvironment CircuitBreaker Health SwiftMetricsPrometheus Swift-JWT ibm-cloud-env hystrix-js /health appmetrics-prometheus jsonwebtoken
59 IBM Foundation Support for Runtimes generator-nodeserver appmetrics monitoring generator-swiftserver swiftmetrics monitoringjavametrics monitoring IBM Support for Runtimes Enterprise Support: Runtimes
60 LoopBack IBM Foundation Support for Runtimes generator-nodeserver appmetrics monitoring generator-swiftserver swiftmetrics monitoringjavametrics monitoring IBM Support for Runtimes IBM Advanced Support for Runtime Frameworks Enterprise Support: Frameworks
61 LoopBack IBM Foundation Support for Runtimes IBM Advanced Support for Runtime Frameworks generator-nodeserver appmetrics monitoring generator-swiftserver swiftmetrics monitoringjavametrics monitoring IBM Support for Runtimes Enterprise Support: Module Ecosystems
What’s Missing?
PUBLIC NETWORK CLOUD NETWORK CATALOG ORDER INVENTORY USER MySQL MongoDB SPARK ELASTICSEARCH BACKEND FOR
 FRONTEND MICROSERVICES SERVICES LOAD
 BALANCER
PUBLIC NETWORK CLOUD NETWORK CATALOG ORDER INVENTORY USER MySQL MongoDB SPARK ELASTICSEARCH BACKEND FOR
 FRONTEND MICROSERVICES SERVICES LOAD
 BALANCER
PUBLIC NETWORK CLOUD NETWORK CATALOG ORDER INVENTORY USER MySQL MongoDB SPARK ELASTICSEARCH BACKEND FOR
 FRONTEND MICROSERVICES SERVICES LOAD
 BALANCER
PUBLIC NETWORK CLOUD NETWORK CATALOG ORDER INVENTORY USER MySQL MongoDB SPARK ELASTICSEARCH BACKEND FOR
 FRONTEND MICROSERVICES SERVICES LOAD
 BALANCER
PUBLIC NETWORK CLOUD NETWORK CATALOG ORDER INVENTORY USER MySQL MongoDB SPARK ELASTICSEARCH BACKEND FOR
 FRONTEND MICROSERVICES SERVICES LOAD
 BALANCER
PUBLIC NETWORK CLOUD NETWORK CATALOG ORDER INVENTORY USER MySQL MongoDB SPARK ELASTICSEARCH BACKEND FOR
 FRONTEND MICROSERVICES SERVICES LOAD
 BALANCER
PUBLIC NETWORK CLOUD NETWORK CATALOG ORDER INVENTORY USER MySQL MongoDB SPARK ELASTICSEARCH BACKEND FOR
 FRONTEND MICROSERVICES SERVICES LOAD
 BALANCER
BROWSER TIME
BROWSER LOAD BALANCER TIME
BROWSER LOAD BALANCER WEB BFF TIME
BROWSER LOAD BALANCER WEB BFF ORDER SERVICE TIME
BROWSER LOAD BALANCER WEB BFF ORDER SERVICE MongoDB TIME
BROWSER LOAD BALANCER WEB BFF ORDER SERVICE MongoDB INVENTORY SERVICE TIME
MySQL BROWSER LOAD BALANCER WEB BFF ORDER SERVICE MongoDB INVENTORY SERVICE TIME
MySQL BROWSER LOAD BALANCER WEB BFF ORDER SERVICE MongoDB INVENTORY SERVICE MongoDB TIME
• Collects data from each enabled service
 • Propagates correlation ID using HTTP headers
 • Provides sampling, tracing, and debug capabilities • Collects microsecond timestamps
 • Correlates data in Zipkin server • Presents data in Zipkin dashboard Request Tracking: OpenTracing and Zipkin
Swift Cloud Workshop - Swift Microservices
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Swift Cloud Workshop - Swift Microservices

  • 1. Deploying Swift
 With Docker and Kubernetes Swift Cloud Workshop 3
 February 23rd, 2018 Chris Bailey
 (@Chris__Bailey)
  • 5. : Key Technologies Container Orchestration Package and Deploy
  • 6. : Key Technologies Container Orchestration MonitoringPackage and Deploy
  • 7. : Key Technologies Container Orchestration Monitoring Fault TolerancePackage and Deploy
  • 9. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Kitura
  • 10. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Kitura import Kitura import LoggerAPI import CloudEnvironment import KituraContracts import Health public let projectPath = ConfigurationManager.BasePath.project.path public let health = Health() public class App { let router = Router() let cloudEnv = CloudEnv() public init() throws { } func postInit() throws { initializeMetrics(app: self) initializeHealthRoutes(app: self) } public func run() throws { try postInit() Kitura.addHTTPServer(onPort: cloudEnv.port, with: router) Kitura.run() } }
  • 11. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore
  • 12. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore FROM ibmcom/swift-ubuntu-runtime:4.0 # We can replace this port with what the user wants EXPOSE 8080 # Install system level packages # RUN apt-get update && apt-get dist-upgrade -y # Add utils files ADD https://raw.githubusercontent.com/IBM-Swift/swift-ubuntu- docker/master/utils/run-utils.sh /swift-utils/run-utils.sh ADD https://raw.githubusercontent.com/IBM-Swift/swift-ubuntu- docker/master/utils/common-utils.sh /swift-utils/common-utils.sh RUN chmod -R 555 /swift-utils # Bundle application source & binaries COPY . /swift-project # Command to start Swift application CMD [ "sh", "-c", "cd /swift-project && .build-ubuntu/release/ helium" ]
  • 13. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore Dockerfile Dockerfile-tools
  • 14. $ docker build -t <your username>/swift-app .

  • 15. $ docker build -t <your username>/swift-app .
 $ docker run -p 49160:8080 -d <your username>/swift-app
  • 16. $ docker build -t <your username>/swift-app .
 $ docker run -p 49160:8080 -d <your username>/swift-app
  • 17. $ docker build -t <your username>/swift-app .
 $ docker run -p 49160:8080 -d <your username>/swift-app
  • 18. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml HELM CHARTS
  • 19. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml HELM CHARTS apiVersion: v1 description: A Helm chart for Kubernetes name: swift-app version: 1.0.0
  • 20. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml HELM CHARTS apiVersion: extensions/v1beta1 kind: Deployment metadata: name: “{{ .Chart.Name }}-deployment" labels: chart: “{{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}’ spec: replicas: “{{ .Values.replicaCount }}” revisionHistoryLimit: “{{ .Values.revisionHistoryLimit }}” template: metadata: labels: app: “{{ .Chart.Name }}-selector" version: "current" spec: containers: - name: “{{ .Chart.Name }}” image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}" imagePullPolicy: Always livenessProbe: httpGet: path: /health port: {{ .Values.service.servicePort }} initialDelaySeconds: {{.Values.livenessProbe.initialDelaySeconds}} periodSeconds: {{ .Values.livenessProbe.periodSeconds}} resources: requests: cpu: "{{ .Values.image.resources.requests.cpu }}" memory: "{{ .Values.image.resources.requests.memory }}" env: - name: PORT
  • 21. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml HELM CHARTS apiVersion: autoscaling/v2beta1 kind: HorizontalPodAutoscaler metadata: name: "{{ .Chart.Name }}-hpa-policy" namespace: default spec: scaleTargetRef: apiVersion: apps/v1beta1 kind: Deployment name: "{{ .Chart.Name }}-deployment" minReplicas: {{ .Values.hpa.minReplicas }} maxReplicas: {{ .Values.hpa.maxReplicas }} metrics: - type: Resource resource: name: cpu targetAverageUtilization: {{.Values.hpa.metrics.cpu.targetAverageUtilization}} - type: Resource resource: name: memory targetAverageUtilization: {{.Values.hpa.metrics.memory.targetAverageUtilization}} {{ end }}
  • 22. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml HELM CHARTS apiVersion: v1 kind: Service metadata: annotations: prometheus.io/scrape: 'true' name: "{{ .Chart.Name }}-service" labels: chart: "{{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}" spec: type: {{ .Values.service.type }} ports: - name: http port: {{ .Values.service.servicePort }} selector: app: "{{ .Chart.Name }}-selector"
  • 23. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml HELM CHARTS replicaCount: 1 revisionHistoryLimit: 1 image: repository: registry.ng.bluemix.net/replace-namespace/swift-app tag: v1.0.0 pullPolicy: Always resources: requests: cpu: 200m memory: 300Mi livenessProbe: initialDelaySeconds: 3000 periodSeconds: 1000 service: name: Node type: NodePort servicePort: 8080 hpa: enabled: false minReplicas: 1 maxReplicas: 2 metrics: cpu: targetAverageUtilization: 70 memory: targetAverageUtilization: 70 services: base: enabled: false replicaCount: 1 image: tag : v0.9.9 weight: 100 prometheus: enabled: false
  • 24. $ helm package ./chart/swift-app
  • 25. $ helm package ./chart/swift-app $ helm install ./swift-app-1.0.0.tgz
  • 26. $ helm package ./chart/swift-app $ helm install ./swift-app-1.0.0.tgz
  • 27. $ helm package ./chart/swift-app $ helm install ./swift-app-1.0.0.tgz
  • 28. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml Jenkinsfile
  • 29. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Dockerfile Dockerfile-tools .dockerignore chart/swift-app/Chart.yaml chart/swift-app/templates/deployment.yaml chart/swift-app/templates/hpa.yaml chart/swift-app/templates/service.yaml chart/swift-app/values.yaml Jenkinsfile #!groovy @Library('MicroserviceBuilder') _ microserviceBuilderPipeline { image = ‘swift-app’ }
  • 31. • Checks status of service • Requires /health endpoint providing data
 • Restarts service if not 200 OK • Restarts service if no response
 Microservice Health: Liveness Probes
  • 32. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Kitura
  • 33. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Kitura import Kitura import LoggerAPI import CloudEnvironment import KituraContracts import Health public let projectPath = ConfigurationManager.BasePath.project.path public let health = Health() public class App { let router = Router() let cloudEnv = CloudEnv() public init() throws { } func postInit() throws { initializeMetrics(app: self) initializeHealthRoutes(app: self) } public func run() throws { try postInit() Kitura.addHTTPServer(onPort: cloudEnv.port, with: router) Kitura.run() } }
  • 34. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift Tests/* Package.swift README.md .gitignore Kitura import LoggerAPI func initializeHealthRoutes(app: App) { app.router.get("/health") { request, response, _ in let result = health.status.toSimpleDictionary() if health.status.state == .UP { try response.send(json: result).end() } else { try response.status(.serviceUnavailable).send(json: result).end() } } }
  • 35. • Provides “fault tolerance” to an application
 • Enables handling of failed downstream services • Prevents repeated calls to failed services • Provides alternative fallback function
 • Integrates with monitoring Microservice Resilience: Hystrix and CircuitBreaker
  • 36. • Provides “fault tolerance” to an application
 • Enables handling of failed downstream services • Prevents repeated calls to failed services • Provides alternative fallback function
 • Integrates with monitoring Microservice Resilience: Hystrix and CircuitBreaker
  • 37. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift
 Tests/* Package.swift README.md .gitignore Kitura breaker = CircuitBreaker( name: "breaker",
 timeout: 10000, maxFailures: 3, rollingWindow: 60000, command: myCommand, fallback: myFallback) func myFallback(err: BreakerError, msg: String) { Log.verbose("Error: (error)") Log.verbose("Message: (msg)") } func myCommand(invocation: Invocation<(String), String>) {
 
 } breaker.run(commandArgs: , fallbackArgs:) CircuitBreaker
  • 38. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift
 Tests/* Package.swift README.md .gitignore Kitura breaker = CircuitBreaker( name: "breaker",
 timeout: 10000, maxFailures: 3, rollingWindow: 60000, command: myCommand, fallback: myFallback) func myFallback(err: BreakerError, msg: String) { Log.verbose("Error: (error)") Log.verbose("Message: (msg)") } func myCommand(invocation: Invocation<(String), String>) {
 
 } breaker.run(commandArgs: , fallbackArgs:) CircuitBreaker
  • 39. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift
 Tests/* Package.swift README.md .gitignore Kitura breaker = CircuitBreaker( name: "breaker",
 timeout: 10000, maxFailures: 3, rollingWindow: 60000, command: myCommand, fallback: myFallback) func myFallback(err: BreakerError, msg: String) { Log.verbose("Error: (error)") Log.verbose("Message: (msg)") } func myCommand(invocation: Invocation<(String), String>) {
 
 } breaker.run(commandArgs: , fallbackArgs:) CircuitBreaker
  • 40. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift
 Tests/* Package.swift README.md .gitignore Kitura breaker = CircuitBreaker( name: "breaker",
 timeout: 10000, maxFailures: 3, rollingWindow: 60000, command: myCommand, fallback: myFallback) func myFallback(err: BreakerError, msg: String) { Log.verbose("Error: (error)") Log.verbose("Message: (msg)") } func myCommand(invocation: Invocation<(String), String>) {
 
 } breaker.run(commandArgs: , fallbackArgs:) CircuitBreaker
  • 41. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift
 Tests/* Package.swift README.md .gitignore Kitura let circuitParameters = CircuitParameters( timeout: 2000, maxFailures: 2, fallback: myFallback) let request = RestRequest(method: .get, url: "/hello") request.circuitParameters = circuitParameters SwiftyRequest
  • 42. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift
 Tests/* Package.swift README.md .gitignore Kitura let circuitParameters = CircuitParameters( timeout: 2000, maxFailures: 2, fallback: myFallback) let request = RestRequest(method: .get, url: "/hello") request.circuitParameters = circuitParameters SwiftyRequest
  • 43. • Collects data from each enabled service
 • Requires /metrics endpoint providing data
 • Provides storage and correlation capabilities • Provide customisable dashboard
 • Integrates with Graphana, Graphite, etc Microservice Metrics: Prometheus
  • 44. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Tests/* Package.swift README.md .gitignore Kitura
  • 45. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift
 Tests/* Package.swift README.md .gitignore Kitura import Kitura import LoggerAPI import CloudEnvironment import KituraContracts import Health public let projectPath = ConfigurationManager.BasePath.project.path public let health = Health() public class App { let router = Router() let cloudEnv = CloudEnv() public init() throws { } func postInit() throws { initializeMetrics(app: self) initializeHealthRoutes(app: self) } public func run() throws { try postInit() Kitura.addHTTPServer(onPort: cloudEnv.port, with: router) Kitura.run() } }
  • 46. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift Sources/Applicaton/Metrics.swift Tests/* Package.swift README.md .gitignore Kitura import Kitura import SwiftMetrics import SwiftMetricsDash import SwiftMetricsPrometheus import LoggerAPI var swiftMetrics: SwiftMetrics? var swiftMetricsDash: SwiftMetricsDash? var swiftMetricsPrometheus: SwiftMetricsPrometheus? func initializeMetrics(router: Router) { do { let metrics = try SwiftMetrics() let dashboard = try SwiftMetricsDash(swiftMetricsInstance: metrics, endpoint: router) let prometheus = try SwiftMetricsPrometheus(swiftMetricsInstance: metrics, endpoint: router) swiftMetrics = metrics swiftMetricsDash = dashboard swiftMetricsPrometheus = prometheus Log.info("Initialized metrics.") } catch { Log.warning("Failed to initialize metrics: (error)") } }
  • 49. • ‘SwiftMetricsDash’ provides self-hosted monitoring
 • Inbound and Outbound request performance • Resource monitoring • ++ Dispatch queue monitoring
 • ++ profiling and flame graphs Deep Analysis: ‘SwiftMetricsDash’
  • 50. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift Sources/Applicaton/Metrics.swift Tests/* Package.swift README.md .gitignore Kitura import Kitura import SwiftMetrics import SwiftMetricsDash import SwiftMetricsPrometheus import LoggerAPI var swiftMetrics: SwiftMetrics? var swiftMetricsDash: SwiftMetricsDash? var swiftMetricsPrometheus: SwiftMetricsPrometheus? func initializeMetrics(router: Router) { do { let metrics = try SwiftMetrics() let dashboard = try SwiftMetricsDash(swiftMetricsInstance: metrics, endpoint: router) let prometheus = try SwiftMetricsPrometheus(swiftMetricsInstance: metrics, endpoint: router) swiftMetrics = metrics swiftMetricsDash = dashboard swiftMetricsPrometheus = prometheus Log.info("Initialized metrics.") } catch { Log.warning("Failed to initialize metrics: (error)") } }
  • 51. func add(_ a: Int, to b: Int) -> Void { print(a + b) } let a = ”5” let b = 3 Sources/* Sources/Application/Application.swift Sources/Application/Routes/Health.swift Sources/Applicaton/Metrics.swift Tests/* Package.swift README.md .gitignore Kitura import Kitura import SwiftMetrics import SwiftMetricsDash import SwiftMetricsPrometheus import LoggerAPI var swiftMetrics: SwiftMetrics? var swiftMetricsDash: SwiftMetricsDash? var swiftMetricsPrometheus: SwiftMetricsPrometheus? func initializeMetrics(router: Router) { do { let metrics = try SwiftMetrics() let dashboard = try SwiftMetricsDash(swiftMetricsInstance: metrics, endpoint: router) let prometheus = try SwiftMetricsPrometheus(swiftMetricsInstance: metrics, endpoint: router) swiftMetrics = metrics swiftMetricsDash = dashboard swiftMetricsPrometheus = prometheus Log.info("Initialized metrics.") } catch { Log.warning("Failed to initialize metrics: (error)") } }
  • 53. $ kitura init$ kitura init
  • 54. DEMO
  • 56. Config Fault Tolerance Health Check Health Metrics JWT Propagation externalize configuration to improve portability build robust behavior to cope with unexpected failures common format to determine service availability common REST endpoints for monitoring service health interoperable authentication and role- based access control
  • 57. Config Fault Tolerance Health Check Health Metrics JWT Propagation externalize configuration to improve portability build robust behavior to cope with unexpected failures common format to determine service availability common REST endpoints for monitoring service health interoperable authentication and role- based access control CloudEnvironment CircuitBreaker Health SwiftMetricsPrometheus Swift-JWT
  • 58. Config Fault Tolerance Health Check Health Metrics JWT Propagation externalize configuration to improve portability build robust behavior to cope with unexpected failures common format to determine service availability common REST endpoints for monitoring service health interoperable authentication and role- based access control CloudEnvironment CircuitBreaker Health SwiftMetricsPrometheus Swift-JWT ibm-cloud-env hystrix-js /health appmetrics-prometheus jsonwebtoken
  • 59. 59 IBM Foundation Support for Runtimes generator-nodeserver appmetrics monitoring generator-swiftserver swiftmetrics monitoringjavametrics monitoring IBM Support for Runtimes Enterprise Support: Runtimes
  • 60. 60 LoopBack IBM Foundation Support for Runtimes generator-nodeserver appmetrics monitoring generator-swiftserver swiftmetrics monitoringjavametrics monitoring IBM Support for Runtimes IBM Advanced Support for Runtime Frameworks Enterprise Support: Frameworks
  • 61. 61 LoopBack IBM Foundation Support for Runtimes IBM Advanced Support for Runtime Frameworks generator-nodeserver appmetrics monitoring generator-swiftserver swiftmetrics monitoringjavametrics monitoring IBM Support for Runtimes Enterprise Support: Module Ecosystems
  • 63. PUBLIC NETWORK CLOUD NETWORK CATALOG ORDER INVENTORY USER MySQL MongoDB SPARK ELASTICSEARCH BACKEND FOR
 FRONTEND MICROSERVICES SERVICES LOAD
 BALANCER
  • 64. PUBLIC NETWORK CLOUD NETWORK CATALOG ORDER INVENTORY USER MySQL MongoDB SPARK ELASTICSEARCH BACKEND FOR
 FRONTEND MICROSERVICES SERVICES LOAD
 BALANCER
  • 65. PUBLIC NETWORK CLOUD NETWORK CATALOG ORDER INVENTORY USER MySQL MongoDB SPARK ELASTICSEARCH BACKEND FOR
 FRONTEND MICROSERVICES SERVICES LOAD
 BALANCER
  • 66. PUBLIC NETWORK CLOUD NETWORK CATALOG ORDER INVENTORY USER MySQL MongoDB SPARK ELASTICSEARCH BACKEND FOR
 FRONTEND MICROSERVICES SERVICES LOAD
 BALANCER
  • 67. PUBLIC NETWORK CLOUD NETWORK CATALOG ORDER INVENTORY USER MySQL MongoDB SPARK ELASTICSEARCH BACKEND FOR
 FRONTEND MICROSERVICES SERVICES LOAD
 BALANCER
  • 68. PUBLIC NETWORK CLOUD NETWORK CATALOG ORDER INVENTORY USER MySQL MongoDB SPARK ELASTICSEARCH BACKEND FOR
 FRONTEND MICROSERVICES SERVICES LOAD
 BALANCER
  • 69. PUBLIC NETWORK CLOUD NETWORK CATALOG ORDER INVENTORY USER MySQL MongoDB SPARK ELASTICSEARCH BACKEND FOR
 FRONTEND MICROSERVICES SERVICES LOAD
 BALANCER
  • 74. BROWSER LOAD BALANCER WEB BFF ORDER SERVICE MongoDB TIME
  • 75. BROWSER LOAD BALANCER WEB BFF ORDER SERVICE MongoDB INVENTORY SERVICE TIME
  • 76. MySQL BROWSER LOAD BALANCER WEB BFF ORDER SERVICE MongoDB INVENTORY SERVICE TIME
  • 77. MySQL BROWSER LOAD BALANCER WEB BFF ORDER SERVICE MongoDB INVENTORY SERVICE MongoDB TIME
  • 78. • Collects data from each enabled service
 • Propagates correlation ID using HTTP headers
 • Provides sampling, tracing, and debug capabilities • Collects microsecond timestamps
 • Correlates data in Zipkin server • Presents data in Zipkin dashboard Request Tracking: OpenTracing and Zipkin