kubernetes k3 minicluster with vagrant

K3S minicluster on Alpine OS deployed with vagrant

manage cluster from host machine

Get the kubernet config file from guest and save it in a file named k3s-confg

./get-config.sh <master name> > k3s-config

You can then address the k3s by adding the flag --kubeconfig=./k3s-config to the kubectl command

kubectl --kubeconfig=./k3s-config config view

but the best way is to export a environmentvariable for kubectl so that i uses the configuration file by default

export KUBECONFIG="$(pwd)/k3s-config"
kubectl config view

To remove the export and let kubectl use "default" settings again

unset KUBECONFIG

getting kube config file from guest

./get-config.sh <master name> > k3s-config

Downloading kubectl

Linux

curl -LO https://storage.googleapis.com/kubernetes-release/release/`curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt`/bin/linux/amd64/kubectl

Mac OS

curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/darwin/amd64/kubectl

Windows

with curl

curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.15.0/bin/windows/amd64/kubectl.exe

with powershell

Install-Script -Name install-kubectl -Scope CurrentUser -Force
install-kubectl.ps1 [-DownloadLocation <path>]

Using kubectl with k3s-config

$> kubectl --kubeconfig=./k3s-config get nodes
NAME     STATUS   ROLES    AGE   VERSION
master   Ready    master   35m   v1.14.6-k3s.1

Deploy app with ingress access

Deploy cafe app

kubectl apply -f examples/cafe.yaml 

Deploy cafe.example.com certificat

kubectl apply -f examples/cafe.example.com-secret.yaml

Deploy cafe.example.com w/o coffee and tea

kubectl apply -f examples/cafe_only-ingress.yaml

test access to app

C_PORT=8443
C_HOST=127.0.0.1

curl --resolve cafe.example.com:$C_PORT:$C_HOST https://cafe.example.com:$C_PORT/ --insecure

Server address: 10.42.0.11:80
Server name: cafe-77654cbdbb-qffsw
Date: 15/Sep/2019:17:59:18 +0000
URI: /
Request ID: 426ebf8761a84facdb65486e9f2907b8

curl --resolve cafe.example.com:$C_PORT:$C_HOST https://cafe.example.com:$C_PORT/coffee --insecure

add apps for coffee and tea

kubectl apply -f examples/coffee.yaml
kubectl apply -f examples/tea.yaml

deploy ingress with coffee and tea

kubectl apply -f examples/cafe_coffee_and_tea-ingress.yaml

check to see that url talks to different apps

C_PORT=8443
C_HOST=127.0.0.1

curl --resolve cafe.example.com:$C_PORT:$C_HOST https://cafe.example.com:$C_PORT/ --insecure

Server address: 10.42.0.11:80
Server name: cafe-77654cbdbb-qffsw
Date: 15/Sep/2019:18:01:21 +0000
URI: /
Request ID: 5624132df85d187692df6c51bf2cca57

curl --resolve cafe.example.com:$C_PORT:$C_HOST https://cafe.example.com:$C_PORT/coffee --insecure

Server address: 10.42.0.6:80
Server name: coffee-bbd45c6-42mhw
Date: 15/Sep/2019:18:02:46 +0000
URI: /coffee
Request ID: 585bd3ea1ad1de6dddda9b0d5f99f6a7

curl --resolve cafe.example.com:$C_PORT:$C_HOST https://cafe.example.com:$C_PORT/tea --insecure

Server address: 10.42.0.6:80
Server name: coffee-bbd45c6-42mhw
Date: 15/Sep/2019:18:03:16 +0000
URI: /tea
Request ID: 585bd3ea1ad1de6dddda9b0d5f99f6a7
Server address: 10.42.0.6:80

remove demo application

kubectl delete namespace cafeexample