Envoy Proxy Has a Free Edge and Service Proxy Used by Istio and AWS

#proxy #devops #kubernetes #opensource

Envoy is a high-performance edge and service proxy designed for cloud-native applications. It powers Istio, AWS App Mesh, and many other service meshes.

What You Get for Free

L3/L4 filter architecture — TCP proxy, rate limiting
HTTP L7 routing — path, header, query-based routing
gRPC support — native gRPC proxying
Service discovery — DNS, EDS, custom
Health checking — active and passive
Load balancing — round-robin, least-request, ring-hash
Observability — stats, tracing, logging built-in
Hot restart — zero-downtime config updates

Simple Config

static_resources:
  listeners:
  - address:
      socket_address: { address: 0.0.0.0, port_value: 8080 }
    filter_chains:
    - filters:
      - name: envoy.filters.network.http_connection_manager
        typed_config:
          route_config:
            virtual_hosts:
            - name: backend
              routes:
              - match: { prefix: "/" }
                route: { cluster: backend }
  clusters:
  - name: backend
    endpoints:
    - lb_endpoints:
      - endpoint:
          address:
            socket_address: { address: 127.0.0.1, port_value: 3000 }