Advanced Kubernetes

•  Logging
• Elastic search, FluentD,  Kibana,  LogTrail
  
• Authentication
•  OpenID connect(OIDC), Auth0
• Authorization
• Kubernetes RBAC
• Packaging
• Helm
• The job resource
• Job
  
• Scheduling
• CronJob
  
• Deploying on kubernetes
• Spinnaker
  
• Micro services on kubernetes
• linkerD
• Federation
• kubefed
• Monitoring
• Prometheus

 Logging

• It is important to show errors, information and debugging data about application
• Log Aggregation
• ELK stack(Elastic search, log stash, Kibana)

Centralized Logging using

• Fluentd - log forwarding
  
• Elastic search - log indexing
  
• Kibana - visualization
  
• log trail - easy to use UI to show logs

Helm

• Package manager for kubernetes
• Makes application deployment easy
  
• Helm is a tool that streamlines installing and managing Kubernetes applications
  
• Helm uses packaging format called Charts
• Example chart directory
• charts/        -> manually managed chart dependencies
  
• templates   -> template files like deployment, services and so. These are combined with config values from values.yaml
  
• Chart.yaml -> meta data of chart. Also replacement for requirements.yaml going forward
  
• requirements.yaml -> chart dependencies
  
• values.yaml -> default config values for the chart
• LICENSE 
• README.md
•  Workflow
• Templates will have files similar to kubernetes files. They have variable interpolation and ability to call funtions within templates. It gets values from values.yaml & funtions from _helper.tpl
• Create your helm chart
  
• helm create mydashboardchart
• helm lint ./mydashboardchart/
• helm install --dry-run --debug ./mydashboardchart/ --generate-name
• change image format, container port in deployment.yaml
• helm install example ./mydashboardchart/ --set service.type=NodePort
  
• minikube service example-mydashboardchart --url
  
• helm list
• helm uninstall example
• helm template --debug <directory> 
  
• Objects
  
• Release
• Charts -> contents of Chart.yaml
  
• Files ->provides access to non-special files in a chart
• Values -> contents of values.yaml
• Capabilities -> 
• Template -> info about current template
• Template Functions and pipelines
• Function syntax
• function_name arg1 arg2 ....
• 60 available funtions
• Pipelines
• pipeline |
• Control structures
• if-else
• with
• range
• Variables
• Named Template
•  
  

 Jobs

• non Parallel jobs 
• kubectl get jobs
• kubectl create -f yaml file

Scheduling with Cron Job

• Cronjob schedule format
• * * * * *
• minute hour day_of_month month day_of_week
• kubectl get cronjob
• 
  
• 

Spinnaker

• Created at Netflix
• 2 core set of features
• Cluster management
• Deployment management
• Red/Black
• rolling red/black
• canary

Linkerd

• It is a transparent proxy that adds
• service discovery
• routing
• latency aware load balancing
• shift traffic to canary deployments
• failure handling
• retries, deadlines, circuit breaking
  
• visibility
• using webuis
• It is run as Daemon set

Federation

•  

Prometheus

• Open source monitoring & alerting tool
• Built at sound cloud
• It provides multi dimentional data model
• flexible query language
• metric collection happens via pull model over http
•