What Is Sidecar Proxy Injection?
Sidecar proxy injection is the process by which a service mesh inserts a network proxy container into a workload, usually via an admission webhook at deploy time. The proxy intercepts all inbound and outbound traffic for the app container next to it. This lets the mesh apply routing, security, and observability without changing application code.
Why it matters
Automatic injection means teams get mesh features like mTLS and retries without editing every manifest. Knowing it happens explains the extra container and why startup ordering matters.
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