1 Deep Dive Into Kubernetes

1.1 Kubernetes Topics

github tag #denny-kubernetes

1.2 Kubernetes BootCamp

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1.2.1 Scenario-101: 1-Node K8S Deployment I

• Objective: Get familiar with K8S concept. Here K8S stands for Kubernetes.
• Requirements:

1. Start one node of k8s in your laptop. Mac or Linux
2. Start a nginx webserver with one instance
3. Scale nginx service into 2 instances.
4. Get familiar with k8s dashboard. Find pods from GUI, check nginx log.

• Main Tech: minikube, nginx, dashboard
• See more: bootcamp/Scenario-101

1.2.2 Scenario-102: 1-Node K8S Deployment II

• Objective: Single node deployment for stateful service
• Requirements:

1. Use yaml to start one mysql server service with 1 instance.
2. Use yaml to start one mysql client service with 2 instances.
3. Delete the db server instance, make sure a new one will be created automatically.
4. When db server is recreated, make sure no data loss.

• Main Tech: minikube, mysql, volume
• See more: bootcamp/Scenario-102

1.2.3 Scenario-103: 1-Node K8S Deployment III

• Objective: Advanced k8s deployment for one single db service
• Requirements:

1. Suppose your k8s/minikube have multiple cluster, how you can segrate them? (Hint: namespace)
2. When we initialize mysql via yaml, avoid store mysql root password in plain text. (Hint: secrets)
3. Make sure we can create no more than 1 pods for DB server. (Hint: ResourceQuota)

• Main Tech: minikube, mysql, volume, Job
• See more: bootcamp/Scenario-103

1.2.4 Scenario-201: 3-Nodes K8S Deployment I

• Objective: Know how to deployment k8s cluster env
• Requirements:

1. Deploy 3 nodes k8s env in your virtualbox.
   One as controller, the other two as worker
2. Deploy k8s web UI, which is missing by default.

• Main Tech:
• See more: bootcamp/Scenario-201

1.2.5 Scenario-202: 3-Nodes K8S Deployment II

• Objective: Improve service availability by choosing service type wisely.
• Requirements:

1. Deploy 3 nodes k8s. One controller, others as workers
2. Create a nginx service with 6 instances.
3. Make sure nginx requests will be balanced across 6 instances.
   (Hint: ClusterIP + Ingress, or External Loadbalancer)

• Main Tech:
• See more: bootcamp/Scenario-202
• TODO

1.2.6 Scenario-203: 3-Nodes K8S Deployment II

• Objective: k8s cluster env with stateful service
• Requirements:

1. Deploy 3 nodes k8s. One controller, others as workers
2. Create an elasticsearch service with 4 instances.
   2 as master, 2 as data.
3. Create a nightly job to backup elasticsearch cluster. (Hint: Cron Jobs)
4. If any es instance has crashed, get alerts.

• Main Tech:
• See more: bootcamp/Scenario-203
• TODO

1.2.7 Scenario-301: Use helm To Deploy Service I

• Objective: Know the basic usage of helm
• Requirements:

1. Use helm to deploy a mysql service with single instance
2. Customize the deployment

• Main Tech: minikube, helm, volume
• See more: bootcamp/Scenario-301

1.2.8 Scenario-302: Use helm To Deploy Service II

• Objective: Advanced usage of helm
• Requirements:

1. Deploy a single instance wordpress service with helm
2. Scale frontend to 2 instance (Hint: kubectl scale)
3. Enforce daily db backup (Hint: CronJob)

• Main Tech: minikube, helm, volume
• See more: bootcamp/Scenario-302

1.2.9 Scenario-303: Use helm To Deploy Service III

• Objective: HA deployemnt with helm
• Requirements:

1. Create a wordpress Chart by yourself
2. Deploy a HA wordpress service with your helm chart

• Main Tech: helm, volume
• See more: bootcamp/Scenario-303
• TODO

1.2.10 Scenario-304: Use helm To Deploy Service IV

• Objective: Deploy elasticsearch cluster with 5 instances
• Requirements:

1. Create an elasticsearch cluster
2. Scale the env to 5 instances

• Main Tech: helm, volume
• See more: bootcamp/Scenario-304
• TODO

1.2.11 Scenario-401: Deploy a stateful service I

• Objective: Deploy Jenkins in k8s
• Requirements:

1. Deploy Jenkins service by helm.
2. Make sure JENKINS_HOME directory persist
3. Install slack and git Jenkins plugins during helm install
4. Enable Jenkins slave agents during helm install
5. Start 2 Jenkins masters.

• Main Tech:
• See more: bootcamp/Scenario-401
• TODO

1.2.12 Scenario-402: Deploy a stateful service II

• Objective: Deploy Jenkins in k8s
• Requirements:

1. Deploy Jenkins service by helm. 2 Jenkins master and 2 Jenkins agents
2. Add health check for Jenkins agents (Hint: livenessProbe)
3. Use nginx as an ingress for Jenkins master
4. Simulate Jenkins slave crash events, and confirm service is fine
5. Simulate Jenkins master crash events, and confirm service is fine

• Main Tech:
• See more: bootcamp/Scenario-402
• TODO

1.2.13 Scenario-501: Day2 Mission: Setup Prometheus monitoring

• Objective: Setup k8s monitoring
• Requirements:

1. Setup prometheus monitoring for infra level
2. Setup prometheus monitoring for application level

• Main Tech:
• See more: bootcamp/Scenario-501
• TODO

1.2.14 Scenario-502: Day2 Mission: Prometheus Operator

• Objective: Learn more about k8s operator concept
• Requirements:

1. Enable prometheus operator
2. AIOps: Use operator to respond to repetitive issues from monitoring system

• Main Tech:
• See more: bootcamp/Scenario-502
• TODO

1.3 More Resources

License: Code is licensed under MIT License.

• More resources: run services on k8s cluster

http://containertutorials.com/get_started_kubernetes/k8s_example.html
Kubernetes Example

https://kubernetes.io/docs/tutorials/
kubernetes kubernetes

https://kubernetes.io/docs/getting-started-guides/scratch/
Creating a Custom Cluster from Scratch

https://github.com/kubernetes/examples
kubernetes examples in GitHub From Google

https://kubernetes.io/docs/concepts/configuration/overview/
Configuration Best Practices

• More resources: k8s cluster itself

https://github.com/kelseyhightower/kubernetes-the-hard-way
Bootstrap Kubernetes the hard way on Google Cloud Platform. No scripts.

https://github.com/davidkbainbridge/k8s-playground
Simple VM based Kubernetes cluster setup