helper.py will scan dir for files with kubernetes component naming convention... sort them in order from external components to internals... run apply command to files in order

KUBERNETES CLI TOOLS

• kubectl

  • standard command-line tool for Kubernetes, you can perform all the operations of Kubernetes that are required.

• kubectx

  • multi cluster hopping tool

• kubens

  • multi component namespace tool

• helm

  • kubernetes package manager

    • download pre configured clusters

  • Templating Engine

    • ability to set variables in template {context}
      • use context variables in component configuration file

STEPS TO DEPLOY CLUSTER

• create docker images

• tag & push to cloud provider registry

• create cluster

• create secrets and config files

• create deployments of pods

• create their services (internal & external)

• apply all

  • apply namespace
  • apply configMap
  • apply secrets
  • apply deployment
  • apply service
  • apply ingress
• • MINICUBE
    • minikube makes you build images and serivces using their commands
• • AZURE CLOUD
    • tag image
    • push to azure container registry
    • login using credentials command from AKS
    • use kubectl with namespace to use azure kubernetes

Kubernetes Commands

install hyperhit and minikube (mac)

• brew update
• brew install hyperkit
• brew install minikube
• kubectl
• minikube

create minikube cluster

• minikube start --vm-driver=hyperkit
• kubectl get nodes
• minikube status
• kubectl version

delete cluster and restart in debug mode

• minikube delete
• minikube start --vm-driver=hyperkit --v=7 --alsologtostderr
• minikube status

kubectl commands

• kubectl get nodes
• kubectl get pod
• kubectl get services
• kubectl create deployment nginx-depl --image=nginx
• kubectl get deployment
• kubectl get replicaset
• kubectl edit deployment nginx-depl

debugging

• kubectl logs {pod-name}
• kubectl exec -it {pod-name} -- bin/bash

create mongo deployment

• kubectl create deployment mongo-depl --image=mongo
• kubectl logs mongo-depl-{pod-name}
• kubectl describe pod mongo-depl-{pod-name}

delete deplyoment

• kubectl delete deployment mongo-depl
• kubectl delete deployment nginx-depl

create or edit config file

• vim nginx-deployment.yaml
• kubectl apply -f nginx-deployment.yaml
• kubectl get pod
• kubectl get deployment

delete with config

• kubectl delete -f nginx-deployment.yaml

Metrics

• kubectl top: The kubectl top command returns current CPU and memory usage for a cluster’s pods or nodes, or for a particular pod or node if specified.

minicube ingress

• 'minikube addons enable ingress'

display all namespaces

• kubens

  • make sure to have kubectx installed

• kubectl get ns

display resources with custom namespace

• kubectl api-resources --namespaced=true
• kubectl api-resources --namespaced=false

Active namespace

• kubectl config set-context --current --namespace=NAMESPACE
• kubens NAMESPACE

CONFIGURATION FILES

config files are for components to deploy onto the cluster... kind = component type

• There are multiple config files
  • each component needs a config file

namespace

• components can have namespaces to group them up with one another to make groups within the cluster
• add namespace as key in config.yaml file

yaml sections

• Kind (type of component)
• Metadata
  • name
  • labels
• Spec
  • replicas (load balance)
  • selector (app label)
  • Templates (pods) spec (each pod container has specs for its vm) - port config

secrets.yaml

• VALUES MUST BE BASE 64 ENCODED
  • write: 'echo -n "secret string" | base64'
  • paste that output into secrets.yaml key pair, value

setting up service.yaml

• Internal

  • no need to identify type
  • match the ports of container and service

• External

  • identify type as LoadBalancer

  • MINICUBE

    • minikube service SERVICE_NAME

ingress

• use third-party implementation to make an "ingress controller pod" and attatch to the apps ingress
  • write: 'minikube addons enable ingress'