istio.io/archive/v1.24/blog/2020/istio-agent/index.html

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the SDS client and the SDS server communicate through a cross-pod Unix domain
socket (UDS), which needs to be protected by Kubernetes pod security policies.</p><p>With Istio 1.5, Pilot Agent, Envoy, and Citadel Agent will be running in
the same container (the architecture is shown in the following diagram).
To defend against attackers eavesdropping on the cross-pod UDS between Envoy (SDS client)
and Citadel Agent (SDS server), Istio 1.5 merges Pilot Agent and Citadel Agent
into a single Istio Agent and makes the UDS between Envoy and Citadel Agent
private to the Istio Agent container.
The Istio Agent container is deployed as the sidecar of the application service container.</p><figure style=width:70%><div class=wrapper-with-intrinsic-ratio style=padding-bottom:80.39622513132818%><a data-skipendnotes=true href=/v1.24/blog/2020/istio-agent/istio_agent.svg title="The architecture of Istio Agent"><img class=element-to-stretch src=/v1.24/blog/2020/istio-agent/istio_agent.svg alt="The architecture of Istio Agent"></a></div><figcaption>The architecture of Istio Agent</figcaption></figure></div><div class=share-social><div class=heading>Share this post</div><div class=share-buttons><a href="https://www.linkedin.com/shareArticle?mini=true&url=%2fv1.24%2fblog%2f2020%2fistio-agent%2f" target=_blank><img class=share-icon src=/v1.24/img/social/linkedin.svg alt="Share to LinkedIn">
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