K8SCodeComponentsMeetup

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K8SCodeComponentsMeetup

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Kubernetes Code Component Meetup on February 13th, 2018 @Microsoft Starthub TLV

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// repository documentation

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Kubernetes Code Components Meetup
=================================
Presentation
------------
[Kubernetes Code Components](https://ptdrv.linkedin.com/dif0yfi)

Prerequisites
------------
1. A running Kubernetes Cluster - [AKS Instructions](https://docs.microsoft.com/en-us/azure/aks/tutorial-kubernetes-deploy-cluster)
2. Helm - [Installation Instructions](https://github.com/kubernetes/helm/blob/master/docs/install.md)
3. Draft - [Installation Instructions](https://github.com/Azure/draft/blob/master/docs/install.md)
4. kubectl - [Installation Instructions](https://kubernetes.io/docs/tasks/tools/install-kubectl/)
5. Docker - [Installation Instructions](https://docs.docker.com/install/)

Nodeless Jenkins on Kubernetes
------------------------------
### Set up Jenkins using helm

[![asciicast](https://asciinema.org/a/OZqZ4kN3GeqSsj63DxhgiSgvD.png)](https://asciinema.org/a/OZqZ4kN3GeqSsj63DxhgiSgvD?size=small)

```
# if this is the first time you are using helm, please uncomment the line below.

# helm init

helm install --name jenkins stable/jenkins

# Alternatively, if you are having issues with the persistant volume class, you can still install jenkins from the chart provided in this repo:
# helm install --name jenkins jenkins-helm/.
# or to pass the storage class parameter:
helm install --name jenkins stable/jenkins --set Persistence.StorageClass=default

# the provided chart also Adds ACI plugin and Azure AD plugin (needs to be configured though)
```
### Get Jenkins admin password
```
printf $(kubectl get secret --namespace default jenkins-jenkins -o jsonpath="{.data.jenkins-admin-password}" | base64 --decode);echo
```
### Build a Docker Image for Jenkins Slave on your own
```
git clone https://github.com/idanshahar/K8SCodeComponentsMeetup.git

cd KubernetesCodeComponents/jenkins

docker build . --tag ${YOUR_DOCKER_REGISTRY}:${TAG}

docker push ${YOUR_DOCKER_REGISTRY}:${TAG}
```

### Jenkins Configuration
Go to "Manage Jenkins" -> "Configure System"

1. Under Container Template, change the Docker Image to: idanshahar/jenkins-slave:latest
2. Add the following host path volumes: /var/run/docker.sock, /usr/bin/docker 
3. Create a new Pipeline job and select the jenkins file from git
4. Change kubernetes url to 10.0.0.1

Go to "Credentials" -> "System" -> "Global credentials" -> "Add Credentials"

1. Choose "Global" Scope
2. Add your Dockerhub credentials
3. Insert 'docker-hub-credentials' as the credentialls ID

Containerize applications using Draft
-------------------------------------
```
# cd to your app root folder
cd node-draft

draft init #initialize draft

draft create

draft up
```

Monitoring
----------
[Official Kubernetes Metrics Project](https://github.com/kubernetes/metrics)

#### Implementations
1. [Heapster](https://github.com/kubernetes/heapster)
2. [Metrics Server](https://github.com/kubernetes-incubator/metrics-server)
3. [Prometheus Adapter](https://github.com/directxman12/k8s-prometheus-adapter)
4. [Google Stackdriver](https://github.com/GoogleCloudPlatform/k8s-stackdriver) (coming soon)

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