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Scaling Docker Containers using Kubernetes and Azure Container Service

Ben Hall
Ben Hall

Delivered at DDD12, Microsoft UK and NDC Olso 2017

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Scaling Docker Containers using Kubernetes
and Azure Container Service
@Ben_Hall
Ben@BenHall.me.uk
Katacoda.com
Scaling Docker Containers using Kubernetes and Azure Container Service
Scaling Docker Containers using Kubernetes
and Azure Container Service
@Ben_Hall
Ben@BenHall.me.uk
Katacoda.com
WHOAMI?
Learn via Interactive Browser-Based Labs
Katacoda.com
Agenda
• Why containers?
• Building Containerized ASP.NET Core app
• Deploying Containers on Kubernetes and
Azure
• Advantages of Kubernetes

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Scaling Docker Containers using Kubernetes and Azure Container Service

  • 1. Scaling Docker Containers using Kubernetes and Azure Container Service @Ben_Hall Ben@BenHall.me.uk Katacoda.com
  • 3. Scaling Docker Containers using Kubernetes and Azure Container Service @Ben_Hall Ben@BenHall.me.uk Katacoda.com
  • 5. Learn via Interactive Browser-Based Labs Katacoda.com
  • 6. Agenda • Why containers? • Building Containerized ASP.NET Core app • Deploying Containers on Kubernetes and Azure • Advantages of Kubernetes
  • 8. What if we could remove configuration complexity, dependency conflicts and uncertainty?
  • 9. > docker run –p 6379:6379 redis:3.0.3 _.-``__ ''-._ _.-`` `. `_. ''-._ Redis 3.0.3 (00000000/0) 64 bit .-`` .-```. ```/ _.,_ ''-._ ( ' , .-` | `, ) Running in standalone mode |`-._`-...-` __...-.``-._|'` _.-'| Port: 6379 | `-._ `._ / _.-' | PID: 1 `-._ `-._ `-./ _.-' _.-' |`-._`-._ `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | http://redis.io `-._ `-._`-.__.-'_.-' _.-' |`-._`-._ `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | `-._ `-._`-.__.-'_.-' _.-' `-._ `-.__.-' _.-' `-._ _.-' `-.__.-' 1:M 05 Nov 10:42:24.402 # Server started, Redis version 3.0.3 1:M 05 Nov 10:42:24.402 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
  • 10. > docker run -e 'ACCEPT_EULA=Y’ -e 'SA_PASSWORD=yourStrong133tPassword' -p 1433:1433 microsoft/mssql-server-linux This is an evaluation version. There are [154] days left in the evaluation period. 2017-06-09 22:16:14.27 Server Setup step is copying system data file 'C:templatedatamaster.mdf' to '/var/opt/mssql/data/master.mdf'. 2017-06-09 22:16:14.36 Server Setup step is copying system data file 'C:templatedatamastlog.ldf' to '/var/opt/mssql/data/mastlog.ldf'. 2017-06-09 22:16:14.37 Server Setup step is copying system data file 'C:templatedatamodel.mdf' to '/var/opt/mssql/data/model.mdf'. 2017-06-09 22:16:14.40 Server Setup step is copying system data file 'C:templatedatamodellog.ldf' to '/var/opt/mssql/data/modellog.ldf'. 2017-06-09 22:16:14.42 Server Setup step is copying system data file 'C:templatedatamsdbdata.mdf' to '/var/opt/mssql/data/msdbdata.mdf'. 2017-06-09 22:16:14.45 Server Setup step is copying system data file 'C:templatedatamsdblog.ldf' to '/var/opt/mssql/data/msdblog.ldf'. 2017-06-09 22:16:14.57 Server Microsoft SQL Server 2017 (CTP2.1) - 14.0.600.250 (X64) May 10 2017 12:21:23 Copyright (C) 2017 Microsoft Corporation. All rights reserved. Developer Edition (64-bit) on Linux (Ubuntu 16.04.2 LTS) 2017-06-09 22:16:14.58 Server UTC adjustment: 0:00 2017-06-09 22:16:14.58 Server (c) Microsoft Corporation. 2017-06-09 22:16:14.58 Server All rights reserved. 2017-06-09 22:16:14.58 Server Server process ID is 4116.
  • 14. Own Process Space Own Network Interface Own Root Directories Sandboxed It’s not a VM! Container
  • 15. Native CPU Native Memory Native IO No Pre-Allocation No Performance Overheard Container
  • 17. Docker – “Kernel Virtualisation”
  • 18. Three Key Concepts • Docker Containers – Running Processes • Docker Images – “Layered Zip Files” • Docker Registry – Where Images are stored
  • 19. Docker isn’t the only container runtime!
  • 20. Open Container Initiative • Driven by Linux Foundation • Docker Containers === Runtime Specification • Docker Images === Image Specification • CRI-O === Kubernetes Container Runtime
  • 21. > docker run -e 'ACCEPT_EULA=Y’ -e 'SA_PASSWORD=yourStrong133tPassword' -p 1433:1433 microsoft/mssql-server-linux This is an evaluation version. There are [154] days left in the evaluation period. 2017-06-09 22:16:14.27 Server Setup step is copying system data file 'C:templatedatamaster.mdf' to '/var/opt/mssql/data/master.mdf'. 2017-06-09 22:16:14.36 Server Setup step is copying system data file 'C:templatedatamastlog.ldf' to '/var/opt/mssql/data/mastlog.ldf'. 2017-06-09 22:16:14.37 Server Setup step is copying system data file 'C:templatedatamodel.mdf' to '/var/opt/mssql/data/model.mdf'. 2017-06-09 22:16:14.40 Server Setup step is copying system data file 'C:templatedatamodellog.ldf' to '/var/opt/mssql/data/modellog.ldf'. 2017-06-09 22:16:14.42 Server Setup step is copying system data file 'C:templatedatamsdbdata.mdf' to '/var/opt/mssql/data/msdbdata.mdf'. 2017-06-09 22:16:14.45 Server Setup step is copying system data file 'C:templatedatamsdblog.ldf' to '/var/opt/mssql/data/msdblog.ldf'. 2017-06-09 22:16:14.57 Server Microsoft SQL Server 2017 (CTP2.1) - 14.0.600.250 (X64) May 10 2017 12:21:23 Copyright (C) 2017 Microsoft Corporation. All rights reserved. Developer Edition (64-bit) on Linux (Ubuntu 16.04.2 LTS) 2017-06-09 22:16:14.58 Server UTC adjustment: 0:00 2017-06-09 22:16:14.58 Server (c) Microsoft Corporation. 2017-06-09 22:16:14.58 Server All rights reserved. 2017-06-09 22:16:14.58 Server Server process ID is 4116.
  • 22. > docker run -it microsoft/azure-cli bash d5f51519a9b1:/# azure info: _ _____ _ ___ ___ info: /_ |_ / | | | _ __| info: _ ___/ _ __/ /| |_| | / _|___ _ _ info: (___ /_/ _/___|___/|_|____| _____) info: (_______ _ _) _ ______ _)_ _ info: (______________ _ ) (___ _ _) info: info: Microsoft Azure: Microsoft's Cloud Platform info: info: Tool version 0.10.11
  • 25. > cat Program.cs namespace dotnetapp { public class Program { public static void Main(string[] args) { var host = new WebHostBuilder() .UseKestrel() .UseContentRoot(Directory.GetCurrentDirectory( )) .UseUrls("http://0.0.0.0:5000") .UseIISIntegration() .UseStartup<Startup>() .Build(); host.Run(); } } } > cat Startup.cs namespace dotnetapp { public class Startup { public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory) { loggerFactory.AddConsole(); app.Run(async (context) => { await context.Response.WriteAsync("Request processed by " + System.Environment.MachineName); }); } } }
  • 26. $ ls .git Controllers Program.cs dotnetapp.csproj Dockerfile Makefile Startup.cs wwwroot $ cat Dockerfile FROM microsoft/dotnet:1.1.1-sdk
  • 28. $ cat Dockerfile FROM microsoft/dotnet:1.1.1-sdk RUN mkdir /app WORKDIR /app COPY dotnetapp.csproj /app/ RUN dotnet restore
  • 29. $ cat Dockerfile FROM microsoft/dotnet:1.1.1-sdk RUN mkdir /app WORKDIR /app COPY dotnetapp.csproj /app/ RUN dotnet restore COPY . /app RUN dotnet publish -c Release -o out
  • 30. $ cat Dockerfile FROM microsoft/dotnet:1.1.1-sdk RUN mkdir /app WORKDIR /app COPY dotnetapp.csproj /app/ RUN dotnet restore COPY . /app RUN dotnet publish -c Release -o out EXPOSE 5000/tcp CMD ["dotnet", "out/dotnetapp.dll"]
  • 31. $ docker build -t katacoda/dotnet-example:v1 . Sending build context to Docker daemon 137.7 kB Step 1/11 : FROM microsoft/dotnet:1.1.1-sdk Step 2/11 : RUN mkdir /build Step 3/11 : WORKDIR /build Step 4/11 : COPY dotnetapp.csproj . Step 5/11 : RUN dotnet restore Step 6/11 : COPY . . Step 7/11 : RUN dotnet publish -c Release -o out ---> Running in fcde25425eee Microsoft (R) Build Engine version 15.1.548.43366 Copyright (C) Microsoft Corporation. All rights reserved. dotnetapp -> /build/bin/Release/netcoreapp1.1/dotnetapp.dll Step 8/11 : FROM microsoft/dotnet:1.1.1-runtime Step 9/11 : WORKDIR /app Step 10/11 : CMD dotnet dotnetapp.dll Step 11/11 : COPY --from=0 /build/out /app/ Successfully built 1dbec44d4150 Successfully tagged katacoda/dotnet-example:v1.1
  • 32. $ docker run -d -t -p 5000:5000 --name app katacoda/dotnet-example:v1 $ curl dockerhost:5000 Request processed by zb8gh24wva
  • 33. CI/CD Pipeline Git Push Gitlab Starts Build docker build docker run
  • 34. > cat Dockerfile FROM node:6 RUN mkdir -p /usr/src/app WORKDIR /usr/src/app COPY package.json /usr/src/app RUN npm install COPY . /usr/src/app CMD [ "npm", "start" ] > docker build –t nodeapp . > docker run –d –p 3000 nodeapp
  • 36. Example – ASP.NET FROM microsoft/dotnet:1.1.1-sdk WORKDIR /app # copy csproj and restore as distinct layers COPY dotnetapp.csproj /app/ RUN dotnet restore COPY . /app/ RUN dotnet publish -c Release -o out CMD ["dotnet", "out/dotnetapp.dll"]
  • 37. Deploying Build Tools  REPOSITORY TAG IMAGE ID CREATED SIZE katacoda/dotnet-example v1 b8f8b523d3ca 6 minutes ago 894.7 MB
  • 38. Example – ASP.NET FROM microsoft/dotnet:1.1.1-runtime WORKDIR /app COPY out /app ENTRYPOINT ["dotnet", "dotnetapp.dll"]
  • 39. # First Stage FROM microsoft/dotnet:1.1.1-sdk WORKDIR /app COPY dotnetapp.csproj /app/ RUN dotnet restore COPY . /app/ RUN dotnet publish -c Release -o out # Second Stage FROM microsoft/dotnet:1.1.1-runtime WORKDIR /app CMD ["dotnet", "dotnetapp.dll”] COPY --from=build out /app/
  • 40. Optimised Image REPOSITORY TAG IMAGE ID CREATED SIZE katacoda/dotnet-example v1 d69cf725c406 5 seconds ago 266.3 MB katacoda/dotnet-example v1 b8f8b523d3ca 6 minutes ago 894.7 MB
  • 42. Docker Push / Pull > docker push katacoda/dotnet-example:v1 The push refers to a repository [docker.io/katacoda/dotnet-example] 3ed827b6362a: Pushing [=====> ] 1.637 MB/14.81 MB 79d391888f28: Pushed 2bd3dca2fc5a: Mounted from microsoft/dotnet ecb9a3d4923d: Mounted from microsoft/dotnet 6c1558b80cc8: Mounted from microsoft/dotnet 8d4d1ab5ff74: Mounted from microsoft/dotnet > docker pull katacoda/dotnet-example:v1 > docker run katacoda/dotnet-example:v1
  • 43. Docker Push / Pull > docker push katacoda/dotnet-example:v1.1 The push refers to a repository [docker.io/katacoda/dotnet-example] 5ed6d70495ef: Pushing [========> ] 2.479 MB/14.81 MB 79d391888f28: Layer already exists 2bd3dca2fc5a: Layer already exists ecb9a3d4923d: Layer already exists 6c1558b80cc8: Layer already exists 8d4d1ab5ff74: Layer already exists > docker pull katacoda/dotnet-example:v1.1 > docker run katacoda/dotnet-example:v1.1
  • 45. CI/CD Pipeline Git Push Gitlab Starts Build docker build Gitlab Start Release docker push docker run docker pull
  • 49. > docker login katacodademoreg1.azurecr.io Username: katacodademoreg1 Password: Login Succeeded > docker build –t katacodademoreg1.azurecr.io/katacoda/dotnet- example:v1.1 . > docker push katacodademoreg1.azurecr.io/katacoda/dotnet- example:v1.1
  • 51. “docker run” in production?
  • 53. Kubernetes is an open- source system for automating deployment, scaling, and management of containerized applications.
  • 56. Automatic binpacking Self-healing Horizontal scaling Service discovery and load balancing Automated rollouts Secret and configuration management Batch execution Role based access control Auditing API and Extension Hooks
  • 64. > az login > az account set --subscription "8640e4e6-" > az group create -n "demo-k8s" -l "westeurope" > az ad sp create-for-rbac --role="Contributor" -- scopes="/subscriptions/8640e4e6/resourceGroups/demo-k8s"
  • 67. Kubernetes in 1 command… OK, it’s three…
  • 68. > DNS_PREFIX=some-unique-value > CLUSTER_NAME=any-acs-cluster-name > az acs create --orchestrator-type=kubernetes --resource-group $RESOURCE_GROUP --name=$CLUSTER_NAME --dns-prefix=$DNS_PREFIX --generate-ssh-keys > az acs kubernetes install-cli > az acs kubernetes get-credentials --resource-group=$RESOURCE_GROUP --name=$CLUSTER_NAME
  • 70. > ssh katacoda@52.174.195.10 or install client tools (kubectl) locally… $ kubectl get nodes NAME STATUS AGE VERSION k8s-agent-4c8a65bf-0 Ready 9m v1.6.2 k8s-master-4c8a65bf-0 Ready,SchedulingDisabled 9m v1.6.2
  • 71. $ kubectl run dotnetapp --image katacoda/dotnet-example:v1 deployment "dotnetapp" created
  • 72. $ kubectl run dotnetapp --image katacoda/dotnet-example:v1 deployment "dotnetapp" created $ kubectl get deployments NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE dotnetapp 1 1 1 1 5m $ kubectl get pods NAME READY STATUS RESTARTS AGE dotnetapp-2582115574-b59rg 1/1 Running 0 20s
  • 74. $ kubectl expose deployments dotnetapp --port=80 --target-port=5000 --type=LoadBalancer service "dotnetapp" exposed $ kubectl get svc NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE dotnetapp 10.0.47.252 <pending> 80:31078/TCP 8s kubernetes 10.0.0.1 <none> 443/TCP 15m
  • 75. $ kubectl expose deployments dotnetapp --port=80 --target-port=5000 --type=LoadBalancer service "dotnetapp" exposed $ kubectl get svc NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE dotnetapp 10.0.47.252 <pending> 80:31078/TCP 8s kubernetes 10.0.0.1 <none> 443/TCP 15m wait for Kubernetes to configure Azure LB $ kubectl get svc NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE dotnetapp 10.0.47.252 40.118.100.56 80:31078/TCP 5m curl 40.118.100.56
  • 76. > curl 40.118.100.56 Request processed by dotnetapp-2582115574-b59rg > curl 40.118.100.56 Request processed by dotnetapp-2582115574-b59rg > curl 40.118.100.56 Request processed by dotnetapp-2582115574-b59rg > curl 40.118.100.56 Request processed by dotnetapp-2582115574-b59rg
  • 77. $ kubectl scale --replicas=3 deployment/dotnetapp deployment "dotnetapp" scaled $ kubectl get deployments NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE dotnetapp 3 3 3 3 6m $ kubectl get pods NAME READY STATUS RESTARTS AGE dotnetapp-2582115574-0l028 1/1 Running 0 1m dotnetapp-2582115574-b59rg 1/1 Running 0 7m dotnetapp-2582115574-hdbc6 1/1 Running 0 1m
  • 78. > curl 40.118.100.56 Request processed by dotnetapp-2582115574-0l028 > curl 40.118.100.56 Request processed by dotnetapp-2582115574-b59rg > curl 40.118.100.56 Request processed by dotnetapp-2582115574-hdbc6 > curl 40.118.100.56 Request processed by dotnetapp-2582115574-b59rg
  • 79. What did we do? $ kubectl run dotnetapp --image katacoda/dotnet-example:v1 $ kubectl expose deployments dotnetapp --port=80 --target-port=5000 --type=LoadBalancer $ kubectl get svc $ kubectl scale --replicas=3 deployment/dotnetapp
  • 80. What happens if an agent goes down?
  • 82. $ kubectl get nodes NAME STATUS AGE VERSION k8s-agent-4c8a65bf-0 Ready 34m v1.6.2 k8s-agent-4c8a65bf-1 NotReady 15s v1.6.2 k8s-master-4c8a65bf-0 Ready,SchedulingDisabled 34m v1.6.2 wait for node to be configured… $ kubectl get nodes NAME STATUS AGE VERSION k8s-agent-4c8a65bf-0 Ready 34m v1.6.2 k8s-agent-4c8a65bf-1 Ready 2m v1.6.2 k8s-master-4c8a65bf-0 Ready,SchedulingDisabled 34m v1.6.2
  • 83. $ kubectl scale --replicas=6 deployment/dotnetapp $ kubectl get deployment NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE dotnetapp 6 6 6 3 23m wait for containers to be downloaded… $ kubectl get deployment NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE dotnetapp 6 6 6 3 24m
  • 85. > kubectl set image deployment/dotnetapp=katacoda/dotnet-example:v1.1 > curl 40.118.100.56 [v1.1] Request processed by dotnetapp-2582115574-0l028 > curl 40.118.100.56 Request processed by dotnetapp-2582115574-b59rg > curl 40.118.100.56 Request processed by dotnetapp-2582115574-hdbc6 > curl 40.118.100.56 [v1.1] Request processed by dotnetapp-2582115574-b59rg
  • 86. What about the Azure Registry Service?
  • 87. > kubectl create secret docker-registry myregistrykey --docker-server=katacodademoreg1.azurecr.io --docker-username=katacodademoreg1 --docker-password=<REMOVE> --docker-email ben@benhall.me.uk secret "myregistrykey" created.
  • 88. apiVersion: extensions/v1beta1 kind: Deployment metadata: labels: run: dotnetapp spec: replicas: 6 strategy: rollingUpdate: maxSurge: 1 maxUnavailable: 1 type: RollingUpdate template: spec: containers: - image: katacodademoreg1.azurecr.io/katacoda/dotnet-example:v1.1 imagePullSecrets: - name: myregistrykey metadata: labels: run: dotnetapp
  • 89. Access to API and Event Loop
  • 93. > cat sqlserver.yaml apiVersion: v1 kind: Secret metadata: name: azure-secret type: Opaque data: azurestorageaccountname: <name> azurestorageaccountkey: <key> --- apiVersion: v1 kind: Pod metadata: labels: name: mssql role: master name: mssql spec: containers: - env: - name: ACCEPT_EULA value: "Y" - name: SA_PASSWORD value: yourStrong133tPassword image: microsoft/mssql-server-linux volumeMounts: - mountPath: /var/opt/mssql/data name: azure volumes: - azureFile: readOnly: false secretName: azure-secret shareName: k8stest name: azure
  • 94. Is it still up? Monitoring with Prometheus and Kubernetes
  • 95. apiVersion: extensions/v1beta1 kind: DaemonSet metadata: name: node-exporter spec: template: metadata: labels: app: node-exporter name: node-exporter spec: containers: - image: prom/node-exporter name: node-exporter ports: - containerPort: 9100 hostPort: 9100 name: scrape DaemonSet? When new nodes are deployed, automatically schedule workload
  • 96. What should we monitor?
  • 97. apiVersion: v1 kind: Service metadata: annotations: prometheus.io/scrape: 'true' labels: app: node-exporter name: node-exporter name: node-exporter spec: clusterIP: None ports: - name: scrape port: 9100 protocol: TCP selector: app: node-exporter type: ClusterIP
  • 104. > type Dockerfile FROM microsoft/iis:windowsservercore-10.0.14393.693 SHELL ["powershell", "-command"] RUN Install-WindowsFeature NET-Framework-45-ASPNET; Install- WindowsFeature Web-Asp-Net45 RUN Remove-Website -Name 'Default Web Site'; mkdir c:NerdDinner; New-Website -Name 'nerd-dinner' -Port 80 -PhysicalPath 'c:NerdDinner' -ApplicationPool '.NET v4.5‘ EXPOSE 80 COPY NerdDinner c:NerdDinner
  • 105. PS C:> docker build –t nerddinner .
  • 106. PS C:> docker run -d -p 80:80 nerddinner
  • 108. Microsoft & Red Hat https://github.com/kubernetes/features/issues/116
  • 111. SQL Server as a Container
  • 112. Visual Studio as a Container?
  • 115. Everything as a Container
  • 120. Online Kubernetes Training for Companies at Katacoda.com @Ben_Hall Ben@BenHall.me.uk Blog.BenHall.me.uk www.Katacoda.com

Editor's Notes

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  3. Why wouldn’t you just install your stuff? Why over a virtual machine?
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