From the previous chapter, we configured the Istio ingress gateway to expose the bookinfo HTTP service's endpoints to external traffic. In this section, we will configure simple or mutual TLS to provide HTTPS access to the external traffic to access bookinfo services. It is our assumption that you have an understanding of simple and mutual TLS authentication. Additional information can be found here: https://bit.ly/2voH44c.
Simple or mutual TLS termination at the ingress gateway for incoming requests assumes that downstream services are safe and not liable to external attacks or insider threats. After the ingress gateway has been secured, downstream service communication is done using a plaintext HTTP protocol.
If access is requested to external services, TLS origination should start an egress gateway for secure communication with an external service. It is...