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ref

https://rancher.com/docs/k3s/latest/en/installation/kube-dashboard/

install

Deploying the Kubernetes Dashboard

GITHUB_URL=https://github.com/kubernetes/dashboard/releases
VERSION_KUBE_DASHBOARD=$(curl -w '%{url_effective}' -I -L -s -S ${GITHUB_URL}/latest -o /dev/null | sed -e 's|.*/||')
kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/${VERSION_KUBE_DASHBOARD}/aio/deploy/recommended.yaml

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# from https://www.digitalocean.com/community/tutorials/how-to-install-java-on-centos-and-fedora

# JDK 7
#------
# Change to your home directory and download the Oracle Java 7 JDK RPM with these commands:
cd ~
wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.rpm"
# Then install the RPM with this yum command (if you downloaded a different release, substitute the filename here):
sudo yum localinstall jdk-7u79-linux-x64.rpm

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# Possibly obsolete: k3d create --name testcls1 --workers 3
k3d create --name testcls1 --workers 3 --server-arg "--no-deploy=traefik" --server-arg "--no-deploy=servicelb"

# UPDATE: in newer versions onwards, this has evolved to (thanks to comments below):
k3d cluster create --k3s-arg "--no-deploy=traefik@server:*"

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create cluster with port 8080 exposed to host for ingress/lb

k3d create --publish 8080:8080 --name testcls1 --workers 3

ref

https://felixwiedmann.de/k3d-manage-k3s-clusters/

demo-app.yaml

---

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to run example

# term 1
cd histo-example
go clean && go build .
./histo-example

# term 2 - run some load
for i in {1..100000};do curl http://localhost:2112/hello1; curl http://localhost:2112/hello2; sleep 0.5; done

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package metrics_examples

import (
	"net/http"
	"time"

	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/promauto"
	"github.com/prometheus/client_golang/prometheus/promhttp"
)

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# To deploy: kubectl apply -f nginx-hello-world-deployment.yaml
# Access it with the API as a proxy:
# $ kubectl proxy
# Then in your browser: http://localhost:8001/api/v1/namespaces/default/services/nginx:/proxy/#!/

apiVersion: v1
kind: Service
metadata:
  name: nginx
spec:

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export JWT_TOKEN=$(curl -s -H "Content-Type:application/json" -XPOST http://localhost:8080/tokenz -d '{"email":"youremail@youremaildomain.app", "password":"password"}' | jq -r '.token')
curl -H "Content-Type:application/json" -H "Authorization: Bearer $JWT_TOKEN" $@

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package main

import (
	"net/http"

	"github.com/gin-gonic/gin"
)

// album represents data about a record album.
type album struct {

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canadacentral       env-1   demogroup-1
westus              env-2   demogroup-1
westus              env-3   demogroup-1
westus              env-4   demogroup-1
westus              env-5   demogroup-1

uksouth             env-1   demogroup-2
canadacentral       env-2   demogroup-2
canadacentral       env-3   demogroup-2
canadacentral       env-4   demogroup-2