FAQ

Build

• Where do I get binaries?
• Why does Envoy use BoringSSL?
• Why does Envoy take so long to compile?

API

• How do I configure Envoy to use the v3 API?
• How does API versioning interact with a new extension?
• What do the v2, v3, vN etc. mean in API package names?
• Why are the Envoy xDS APIs versioned? What is the benefit?
• What is the status of incremental xDS support?

Debugging

• Why is Envoy sending internal responses?
• Why is Envoy sending HTTP/2 resets?
• Why is Envoy sending 404s to CONNECT requests?
• Why is Envoy sending 413s?
• Why is my route not found?
• Why is Envoy operating on X-Forwarded-Proto instead of :scheme or vice-versa?

Performance

• How fast is Envoy?
• What are best practices for benchmarking Envoy?

Configuration

• How do I configure Envoy as an edge proxy?
• How do I configure Envoy as a level two proxy?
• How do I configure SNI for listeners?
• How do I configure SNI for clusters?
• How do I configure zone aware routing?
  • Envoy configuration on the source service
  • Envoy configuration on the destination service
  • Infrastructure setup
  • Verification steps
• How do I configure tracing?
• How do I configure flow control?
• How do I configure timeouts?
  • HTTP/gRPC
  • TCP
  • Transport Socket
• How are configuration deprecations handled?
• How does Envoy prevent file descriptor exhaustion?

Load balancing

• I setup health checking. When I fail some hosts, Envoy starts routing to all of them again. Why?
• Why doesn’t RR load balancing appear to be even?
• Is there a way to disable circuit breaking?
• How do I handle transient failures?
  • Circuit Breaking
  • Retries
  • Retries in gRPC services
  • Outlier Detection
• How do I make Envoy fail over to another region during service degradation?

Extensions

• Is there a contract my HTTP filter must adhere to?
• Are there well-known headers that will appear in the given headers map of decodeHeaders()?

Windows

• What are the requirements to run on Envoy on Windows?
• Which Envoy features are not supported on Windows?
• Does Envoy on Windows support FIPS?
• How fast is Envoy on Windows?
• What is the security release process?
• Can I run Envoy on Windows under SCM?