Agnhost

Agnostic Host

registry.k8s.io/e2e-test-images/agnhost:2.39

Container image having an extendable CLI that outputs the same expected content, regardless of host (Linux or Windows) OS. The agnhost binary has several subcommands which are used to test various K8s features.

netexec

@ Server

kubectl exec test-agnhost -- \
    /agnhost netexec --http-port 8080

@ Client

curl http://localhost:8080/echo?msg=hello%20$(hostname)
hello XPC

@ kind cluster

☩ dps
CONTAINER ID  NAMES                IMAGE                  PORTS 
adfc57f39b37  kind-control-plane   kindest/node:v1.31.0   0.0.0.0:80->80/tcp, 0.0.0.0:443->443/tcp, 127.0.0.1:44235->6443/tcp ...

☩ k get node
NAME                 STATUS   ROLES           AGE   VERSION
kind-control-plane   Ready    control-plane   16h   v1.31.0

☩ k get pod -o wide
NAME   READY   STATUS    RESTARTS   AGE   IP            NODE               ...
bar    1/1     Running   0          16h   10.244.0.14   kind-control-plane ...
foo    1/1     Running   0          16h   10.244.0.13   kind-control-plane ...
...

☩ k get pod bar -o jsonpath='{.spec.containers[*].image}'
registry.k8s.io/e2e-test-images/agnhost:2.39

• Reference:

  ☩ type dps
  dps is aliased to `docker container ps --format "table {{.ID}}  {{.Names}}\t{{.Image}}\t{{.Ports}}\t{{.Status}}"'
  

  ☩ type k           
  k is a function    
  k ()               
  {                  
  kubectl "$@"   
  }
  

@ Server

# Override default command (/agnhost netexec) with another (/agnhost fake-gitserver)
☩ docker exec -it kind-control-plane \
    kubectl exec -it bar -- \
        /agnhost fake-gitserver

# Equivalent
☩ k exec -it bar -- \
        /agnhost fake-gitserver

@ Client

☩ docker exec -it kind-control-plane \
    kubectl exec -it bar -- \
        curl http://localhost:8000/get
I am a fake git server

# Equivalent
☩ k exec -it bar -- \
    curl http://localhost:8000/get
I am a fake git server