tcp.echo

tcp.echo

Listens on tcp port 12345 and will echo back whatever is sent to the server.

Requirements

• bash, jq, nc
• Kubernetes (e.g. Docker Desktop with Kubernetes enabled)
• kubectl
• helm 3.0+

Setup

The setup.sh script:

• installs Zilla to the Kubernetes cluster with helm and waits for the pod to start up
• starts port forwarding

./setup.sh

output:

+ ZILLA_CHART=oci://ghcr.io/aklivity/charts/zilla
+ helm upgrade --install zilla-tcp-echo oci://ghcr.io/aklivity/charts/zilla --namespace zilla-tcp-echo [...]
NAME: zilla-tcp-echo
LAST DEPLOYED: [...]
NAMESPACE: zilla-tcp-echo
STATUS: deployed
REVISION: 1
NOTES:
Zilla has been installed.
[...]
+ nc -z localhost 12345
+ kubectl port-forward --namespace zilla-tcp-echo service/zilla 12345
+ sleep 1
+ nc -z localhost 12345
Connection to localhost port 12345 [tcp/italk] succeeded!

Verify behavior

nc localhost 12345

Type a Hello, world message and press enter.

output:

Hello, world
Hello, world

Teardown

The teardown.sh script stops port forwarding, uninstalls Zilla and deletes the namespace.

./teardown.sh

output:

+ pgrep kubectl
99999
+ killall kubectl
+ helm uninstall zilla-tcp-echo --namespace zilla-tcp-echo
release "zilla-tcp-echo" uninstalled
+ kubectl delete namespace zilla-tcp-echo
namespace "zilla-tcp-echo" deleted