Explore k14s

What is k14s

k14s has been renamed to Carvel.

Carvel tool official website

Lab 1

• Install Carvel tool
• Define the ytt template & values for cow say app
• Build the ytt template to be OCI image
• Using App from kapp-controller to deploy the cow say app

Install Carvel tool

The official Carvel page has the installation guide: link

brew tap k14s/tap
brew install ytt kbld kapp imgpkg kwt vendir

Create the ytt template and values

Templates

Values

Build the ytt template by using docker

docker build -f Dockerfile -t danielguo/cow-say-template:v1 .
docker push danielguo/cow-say-template:v1

Deploy cow say app

• Switch to root dir of this project
• Install kapp-controller: kubectl apply -f https://github.com/vmware-tanzu/carvel-kapp-controller/releases/latest/download/release.yml
• Create RBAC for kapp-controller. Link to the Yaml
• Create Secret which contains the cow say ytt template values. kubectl create secret generic cow-say-value --from-file=values.yaml=./ytt/values.yaml
• Create App CR for cow-say app Link to the Yaml

• Double check the deployed app

    kapp list
    Target cluster 'https://127.0.0.1:32776' (nodes: kind-control-plane)
  
    Apps in namespace 'default'
  
    Name              Namespaces  Lcs   Lca
    cow-say-app-ctrl  default     true  22s
  
    Lcs: Last Change Successful
    Lca: Last Change Age
  
    1 apps
  
    Succeeded
  

• Enable port forwarding and access the app kubectl port-forward service/cow-say 8081:1323

• Curl to the app endpoint

    curl localhost:8081
     _______
    < Hello >
    -------
            \   ^__^
             \  (oo)\_______
                (__)\       )\/\
                    ||----w |
                    ||     ||%
  

Lab 2

Explore the apply order from kapp: https://github.com/vmware-tanzu/carvel-kapp/blob/develop/docs/apply-ordering.md

• Install kapp-controller kubectl apply -f https://github.com/vmware-tanzu/carvel-kapp-controller/releases/latest/download/release.yml
• Deploy the app in order(the order is specified by the annotation from workload-bundle.yaml) kapp deploy -a cow-say -f ./lab-2/artifacts/workload-bundle.yaml

References

• https://tanzu.vmware.com/content/blog/introducing-k14s-kubernetes-tools-simple-and-composable-tools-for-application-deployment
• https://github.com/vmware-tanzu/carvel-ytt/blob/develop/docs/faq.md
• https://github.com/vmware-tanzu/carvel-ytt/blob/develop/docs/lang-ref-ytt.md
• https://github.com/vmware-tanzu/carvel-kapp-controller/blob/develop/docs/app-spec.md