Linkerd sidecar proxy fails to start

[VaishaliRaval]

Module Name :

https://docs.microsoft.com/en-us/learn/modules/microservices-resiliency-aspnet-core

Step that fails :

Unit : https://docs.microsoft.com/en-us/learn/modules/microservices-resiliency-aspnet-core/6-implement-linkerd-resiliency
Step: Deploy the updated Helm charts

Description:

When user tries to implement infrastructure level resiliency using Linkerd, linkerd sidecar proxy doesn't get created for the Coupon and WebShopping aggregator microservices.

By default Azure Cloud Shell installs Linkerd stable version 2.8.1 and with that when user tries to enable service mesh with AKS Version 1.20.9 side car proxy doesn't get created. In the linkerd logs it shows - linkerd-tap-7779d88fc7-ps42z tap 2021/11/26 11:23:08 http: TLS handshake error from 127.0.0.1:42388: remote error: tls: bad certificate

Possible Root Cause:

After debugging it's found that with linkerd 2.11.1 everything works fine. Though the setup script installs linkerd latest 2.11.1 but azure cloud shell still points to Linkerd version 2.8.1 and that's because the value of $PATH variable.

Workaround:

• Edit vim ~/.bashrc file.
• Remove first Linkerd/bin path to take up the latest.
• After that it picked up the latest Linkerd version 2.11.1 stable release.
• Thereafter the linkerd side car proxies for both Coupon and WebshoppingAgg are injected.