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K3D📜

To test Airgap BigBang on k3d

Steps📜

  • Launch EC2 instance of size c5.2xlarge and ssh into the instance with at least 50GB storage.

  • Install k3d and docker cli tools

  • Download images.tar.gz, repositories.tar.gz and bigbang-version.tar.gz from BigBang release.

curl -O https://umbrella-bigbang-releases.s3-us-gov-west-1.amazonaws.com/umbrella/1.3.0/repositories.tar.gz
curl -O https://umbrella-bigbang-releases.s3-us-gov-west-1.amazonaws.com/umbrella/1.3.0/images.tar.gz
sudo apt install -y net-tools

  • Follow Airgap Documentation to install Git server and Registry.

  • Once Git Server and Registry is up, setup k3d mirroring configuration registries.yaml

mirrors:
  registry.dso.mil:
    endpoint:
      - https://host.k3d.internal:5443
  registry1.dso.mil:
    endpoint:
      - https://host.k3d.internal:5443
  docker.io:
    endpoint:
      - https://host.k3d.internal:5443
configs:
  host.k3d.internal:5443:
    tls:
      ca_file: "/etc/ssl/certs/registry1.pem"
  • Launch k3d cluster
PRIVATEIP=$( curl http://169.254.169.254/latest/meta-data/local-ipv4 )
$ k3d cluster create --image "rancher/k3s:v1.20.5-rc1-k3s1" --api-port "33989" -s 1 -a 2 -v "${HOME}/registries.yaml:/etc/rancher/k3s/registries.yaml" -v /etc/machine-id:/etc/machine-id -v "${HOME}/certs/host.k3d.internal.public.pem:/etc/ssl/certs/registry1.pem" --k3s-server-arg "--disable=traefik" --k3s-server-arg "--disable=metrics-server" --k3s-server-arg "--tls-san=$PRIVATEIP"  -p 80:80@loadbalancer -p 443:443@loadbalancer
  • Block all egress with iptables except those going to instance IP before deploying bigbang by running airgap.sh
sudo ./k3d_airgap.sh
curl https://$PRIVATEIP:5443/v2/_catalog -k # Show return list of images
curl https://$PRIVATEIP:5443/v2/repositories/rancher/library-busybox/tags

​To permanently save the iptable rules across reboot, check out link

  • Test that mirroring is working
curl -k -X GET https://$PRIVATEIP:5443/v2/rancher/local-path-provisioner/tags/list
kubectl run -i --tty  test --image=registry1.dso.mil/rancher/local-path-provisioner:v0.0.19 --image-pull-policy='Always' --command sleep infinity -- sh
kubectl run test --image=registry1.dso.mil/rancher/library-busybox:1.31.1 --image-pull-policy='Always' --restart=Never --command sleep infinity
telnet default.kube-system.svc.cluster.local 443
kubectl describe po test
kubectl delete po test
  • Test that cluster cannot pull outside private registry.
kubectl run test --image=nginx
kubectl describe po test # Should fail
kubectl delete po test
Last update: 2022-08-05 by Ryan Thompson