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eShopOnContainers/k8s/README.k8s.md

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eShopOnContainers on Kubernetes

The k8s directory contains Kubernetes configuration for the eShopOnContainers app and a PowerShell script to deploy it to a cluster. Each eShopOnContainers microservice has a deployment configuration in deployments.yaml, and is exposed to the cluster by a service in services.yaml. The microservices are exposed externally on individual routes (/basket-api, /webmvc, etc.) by an nginx reverse proxy specified in frontend.yaml and nginx.conf.

Prerequisites

  • A Kubernetes cluster. Follow Azure Container Service's walkthrough to create one.

  • A private Docker registry. Follow Azure Container Registry's guide to create one.

  • Optionally, previous steps can be skipped if you run gen-k8s-env.ps1 (or gen-k8s-env-aks.ps1 if you would like to use AKS instead of ACS) script to automatically create the azure environment needed for kubernetes deployment. Azure cli 2.0 must be previously installed installation guide. For example:

    Important: Note the parameter "-createAcr true". If you are creating the K8s cluster but you want to re-use and existing ACR, say "-createAcr false".

./gen-k8s-env -resourceGroupName k8sGroup -location westeurope -registryName k8sregistry -createAcr true -orchestratorName k8s-cluster -dnsName k8s-dns

or using AKS instead of ACS

./gen-k8s-env-aks -resourceGroupName k8sGroup -location westeurope -registryName k8sregistry -dnsName k8s-dns -serviceName k8s-cluster -createAcr true -nodeCount 3 -nodeVMSize Standard_D2_v2
  • A Docker development environment with docker and docker-compose.
  • The Kubernetes command line client, kubectl.
    • This can be installed with the az tool as described in the Azure Container Service walkthrough. az is also helpful for getting the credentials kubectl needs to access your cluster. For other installation options, and information about configuring kubectl yourself, see the Kubernetes documentation.

Deploy the application with the deployment script

  1. Open a PowerShell command line at the k8s directory of your local eShopOnContainers repository.
  2. Ensure docker, docker-compose, and kubectl are on the path, and configured for your Docker machine and Kubernetes cluster.
  3. Run deploy.ps1 with your registry information. The Docker username and password are provided by Azure Container Registry, and can be retrieved from the Azure portal. Optionally, ACR credentials can be obtained by running the following command:
az acr credential show -n eshopregistry

Once the user and password are retrieved, run the following script for deployment. For example:

./deploy.ps1 -registry myregistry.azurecr.io -dockerUser User -dockerPassword SecretPassword -configFile file_with_config.json

The parameter configFile is important (and mandatory) because it contains the configuration used for the Pods in Kubernetes. This allow deploying Pods that use your own resources in Azure or any other cloud provider. A configuration file local.json is provided which configures Pods to use the infrastructure containers (that is sql server, rabbitmq, redis and mongodb must be deployed also in the k8s).

The script will build the code and corresponding Docker images, push the later to your registry, and deploy the application to your cluster. You can watch the deployment unfold from the Kubernetes web interface: run kubectl proxy and open a browser to http://localhost:8001/ui

Pods configuration file

When deploying to k8s the script needs the configFile with the location of a JSON configuration file. This file contains the configuration of the pods. The file is a JSON file. For reference another configuration file (cloud.json) is provided but without valid values.

If you deploy the infrastructure containers use local.json as a value for configFile parameter. If you don't deploy the infrastructure containers use your own configuration file with the correct values.

Parameters of the deploy.ps1 script

The script accepts following parameters:

  • registry: Name of the Docker registry to use. If not passed DockerHub is assumed
  • dockerUser: Login to use for the Docker registry (if needed)
  • dockerPassword: Password to use for the Docker registry (if needed)
  • execPath: Location of kubectl (if not in the path). If passed must finish with the path character.
  • kubeconfigPath: Location of the kubectl configuration file. This parameter is used only in the CI pipeline, so you don't need to pass it when invoking the script using the CLI.
  • configFile: Location of the Yaml file with the externalcfg configmap to be deployed. This configmap is used to configure the Pod's environment This parameter is mandatory
  • imageTag: Tag of the images to deploy to k8s. If not passed the name of the current branch is used.
  • externalDns: External DNS name of the k8s. This is only needed if you have configured a DNS that points to your k8s external IP. If you don't have any DNS configured do not pass this parameter.
  • deployCI: If true means that script is running under the context of a VSTS Hosted Build Agent. You should never use this parameter from CLI
  • buildBits: means that the source code of eShopOnContainers will be built. If you have built your code (and have all projects published in obj/Docker/publish) do not pass this parameter. Default value is false
  • buildImages: If true (default value) Docker images are built and pushed in the Docker registry. If you set this parameter to false, Docker images won't be built nor pushed in the Docker registry (but k8s' deployments and services will be redeployed).
  • deployInfrastructure: If true infrastructure containers (rabbitmq, mongo, redis, sql) will be deployed in k8s. If false those containers (and its related deployments and services in k8s) won't be deployed.
  • dockerOrg: Name of the organization in the registry where the images are (or will be pushed). Default value is eshop (which has images provided by Microsoft)

Important: If you don't pass the -buildBits $true the script won't build and publish the projects to their obj/Docker/publish folder. If any project is not published, you'll be receiving errors like:

ERROR: Service 'xxxxxxx' failed to build: COPY failed: stat /var/lib/docker/tmp/docker-builder123456789/obj/Docker/publish: no such file or directory

Typical usages of the script:

Build all projects, and deploy all them in k8s including infrastructure containers in a organization called foo in Docker Hub. Images will be tagged with my current git branch and containers will use the configuration set in conf_local.yml file:

./deploy.ps1 -buildBits $true -dockerOrg foo -dockerUser MY_USER -dockerPassword MY_PASSWORD -configFile conf_local.yml

Do not build any project and don't rebuild docker images. Create k8s deployments that will pull images from my private repository, in the foo organization, using the tag latest. Containers will use the configuration set in conf_cloud file.

./deploy.ps1 -buildImages $false -dockerOrg foo -registry MY_REGISTRY_FQDN -dockerUser MY_USER -dockerPassword MY_PASSWORD -configFile conf_cloud.yml -imageTag master

Deploy k8s using public images that Microsoft provides:

./deploy.ps1 -buildImages $false -configFile conf_local.yml -imageTag master