MCSPS use cases

Demos and use cases for MCSPS

Simple demo app

• creates configmap for nginx content
• creates 2 pods from nginx image
• creates service
• creates ingress
• deploys DNS entry with external-dns app
• deploys LetsEncrypt cert with cert-manager and letsencrypt-prod issuer

Requires

• k8s 1.21

Change cluster name and app name in CHANGEME lines!

Create:

kubectl create namespace demoapp
kubectl apply -f demoapp.yaml -n demoapp

Destroy:

kubectl delete -f demoapp.yaml -n demoapp
kubectl delete namespace demoapp

Basic Auth Demo

Create or use htpasswd user to access security spaces in your app:

Create:

htpasswd -c auth foo
kubectl create namespace demoapp
kubectl create secret generic htaccess-secret --from-file=auth -n demoapp
kubectl apply -f basicauth-demoapp.yaml -n demoapp

Destroy:

kubectl delete -f basicauth-demoapp.yaml -n demoapp
kubectl delete secret htaccess-secret -n demoapp
kubectl delete namespace demoapp

Reference: https://kubernetes.github.io/ingress-nginx/examples/auth/basic/

Smartcard Auth Demo

If your company/organization provide smartcards for the employees you can use Ingress Client Auth to verify if the client is a member of your organization. Example for "Deutsche Telekom AG Issuing CA 02". Adapt create-smartcard-secret.sh if required.

Create:

kubectl create namespace demoapp
./create-smartcard-secret.sh
kubectl apply -f smartcard-demoapp.yaml -n demoapp

Destroy:

kubectl delete -f smartcard-demoapp.yaml -n demoapp
kubectl delete namespace demoapp

Please note, there is user verification in the demoapp example. If this is required, you can use nginx.ingress.kubernetes.io/auth-tls-pass-certificate-to-upstream: "false" to send cert to upstream service and make a selection of users. Or add a configuration-snippet to set additional header and proceed this also on upstream service:

    nginx.ingress.kubernetes.io/configuration-snippet: |
      if ($ssl_client_verify != SUCCESS) { return 403; }
      proxy_set_header x-smardcard-auth "true";

OAuth2 Keycloak Demo

Provides a save https demo service behind Keycloak OAuth2 through oauth-proxy

Howto:

• Create OpenID Client in Keycloak Realm
• Authorization Enabled, set Valid Redirect URIs = /*, pick up secret key
• Setup a mapper "groups", Full group path = off, al other = on, Token Claim Name = groups
• Adjust app name, cluster name, keycloak-server-name, oauth client id and secret in oauth2-keycloak.yaml

Create:

kubectl create namespace demoapp
kubectl apply -f oauth2-keycloak.yaml -n demoapp

Destroy:

kubectl delete -f oauth2-keycloak.yaml -n demoapp
kubectl delete namespace demoapp

Link: https://github.com/oauth2-proxy/oauth2-proxy

Storage demo

Like Simple demo app

• creates SATA pvc
• mount pvc to pods

Create:

kubectl create namespace demoappvol
kubectl apply -f demoapp_volume.yaml -n demoappvol
POD=$(kubectl  get pods -n demoappvol  --no-headers | tail -1 | awk '{print $1}')
kubectl cp README.md demoappvol/$POD:/usr/share/nginx/html/
curl https://<app_name>/README.md

Delete:

kubectl delete -f demoapp_volume.yaml -n demoappvol
kubectl delete namespace demoappvol

OpenStack Cloud Controller

Create an external enhanced loadbalancer (ELB) with sticky session

kubectl create -f otc-lb.yaml

Cinder-CSI-Plugin

The new storage solution after migration to External Cloud Provider

Create OTC storage classes:

kubectl create -f cinder-csi-plugin/otc-storageclasses.yaml

Create OTC storage snapshot class:

kubectl create -f cinder-csi-plugin/otc-volumesnapshotclass.yaml 

Create OTC storage (PVC):

kubectl create -f cinder-csi-plugin/otc-pvc.yaml 

Create OTC Volume Snapshot:

kubectl create -f cinder-csi-plugin/otc-volumesnapshot.yaml 

Create OTC Volume Block-Device (with POD):

kubectl create -f cinder-csi-plugin/otc-blockdevice.yaml

Helm Deployment of Demo App

see subfolder

Hello world tomcat web server as microservice

see subfolder

Hello world kustomization

see kustomization.yaml and helloworld folder

Create:

kubectl apply -k . -n helloworld

Delete:

kubectl delete -k . -n helloworld

Rancher Project Monitoring

Example how to install a new instance of Prometheus Operator in specific namespace (demoapp)

Adjust namespace, app labels, ServiceMonitor, and alertmanager secret Refer to flask folder for a Python demo app to monitor

Create:

kubectl apply -f monitoring

Delete:

kubectl delete -f monitoring

Kubesec Pen Test

Test your deployment files agains K8s security advisories

Create:

adjust clustername and ingress name in kubesec.yaml

kubectl create namespace kubesec
kubectl apply -f kubesec.yaml -n kubesec

Howto:

curl -sSX POST --data-binary @kubesec.yaml  https://kubesec.mcsps.telekomcloud.com/scan/

K8S Overlay Network Test

Test connectivity between PODs in Overlay Network (needs image root access, run in kube-system namespace)

kubectl apply -f overlaytest.yaml 
sh overlaytest.sh

MySQL Client

Install a POD with mysql-client

Create:

kubectl apply -f mysql-client.yaml 
kubectl exec -it mysql-client-0 -- bash
# apk add mysql-client

Delete:

kubectl delete -f mysql-client.yaml 

Use mysql-client_volume.yaml if you need to create and mount PVC

K8S Client

Install a POD with k8s-client

Create:

kubectl apply -f k8s-client.yaml
kubectl exec -it k8s-client-0 -- bash

Delete:

kubectl delete -f k8s-client.yaml

Go Client

Install a POD with go-client

Create:

kubectl apply -f go-client.yaml
kubectl exec -it go-client-0 -- bash

Delete:

kubectl delete -f go-client.yaml

go-client contains a Golang Runtime environment. To use with a persistent volume for the workdir, or adjust for emptydir.

Cosign Image Sign/Verify

verify image signature within init container

see demo-cosign.yaml

Istio Multi-Cluster Demo

see subfolder

Backup K8S resources with kube-backup

see kube-backup.yaml

and https://github.com/mcsps/kube-backup

Logging Ingress logs in User space and deliver to Elasticsearch

see rsyslog-deploy.yaml