TCP Network balancer using Envoy

envoy-config.yaml

admin:
  access_log_path: /dev/null
  address:
    socket_address: { address: 127.0.0.1, port_value: 8001 }

static_resources:
  listeners:
  - name: listener1
    address:
      socket_address: { address: 0.0.0.0, port_value: 443 }
    filter_chains:
    - filters:
      - name: envoy.tcp_proxy
        config:
          stat_prefix: ingress1
          cluster: cluster1
          access_log:
            name: envoy.file_access_log
            config:
              path: "/var/log/envoy/envoy-cluster1.log"
          max_connect_attempts: 3
  clusters:
  - name: cluster1
    connect_timeout: 0.25s
    type: EDS
    eds_cluster_config:
      eds_config:
        path: ./envoy-eds-cluster1.yaml
    lb_policy: ROUND_ROBIN
    health_checks:
      - timeout: 1s
        interval: 1s
        no_traffic_interval: 1s
        interval_jitter: 0.1s
        unhealthy_threshold: 2
        healthy_threshold: 2
        tcp_health_check: {}

envoy-eds-cluster1.yaml

version_info: "0"
resources:
- "@type": type.googleapis.com/envoy.api.v2.ClusterLoadAssignment
  cluster_name: cluster1
  endpoints:
  - priority: 0
    lb_endpoints:
    - endpoint:
        address:
          socket_address:
            address: 127.0.0.1
            port_value: 8443
  - priority: 1
    lb_endpoints:
    - endpoint:
        address:
          socket_address:
            address: failover-ip
            port_value: 443