Add Envoy readiness probe

[aws]

Add Envoy readiness probe

[stefanprodan]

@bcelenza I've updated the issue with the curl command.

[bcelenza]

Can we standardize on the command we use for health checking? Here's what we are adding to the public docs and example repos (just now updated for v1.9):

aws/aws-app-mesh-examples#115
awsdocs/aws-app-mesh-user-guide#3

[stefanprodan]

Does the AWS Envoy fork has curl installed in the container? The official image has only wget.

[stefanprodan]

Hmm looks like the App Mesh Envoy image has curl installed while the official Envoy has wget.

App Mesh Envoy:

kubectl -n test exec -it ingress-646fd6d8bd-pl2pr -c envoy sh
sh-4.2$ curl
curl: try 'curl --help' or 'curl --manual' for more information
sh-4.2$ wget
sh: wget: command not found

Official Envoy:

kubectl -n test exec -it ingress-646fd6d8bd-pl2pr -c ingress sh
/ # curl
sh: curl: not found
/ # wget
BusyBox v1.28.4 (2018-12-06 15:13:21 UTC) multi-call binary.

[kiranmeduri]

See ECS example for reference https://github.com/aws/aws-app-mesh-examples/blob/master/walkthroughs/howto-grpc/app.yaml#L250

[fawadkhaliq]

Readiness probe has been added here: #325

[haksuuuuuu]

Hi, Even if It looks solved, I suffered same issue today.

I followed app mesh workshop and the command for app mesh controller install looks not special.
(https://www.eksworkshop.com/intermediate/330_app_mesh/install_app_mesh_controller/install_controller/)