envoy app

Author: ganmacs

envoy/http/app/.bundle/config

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+---
+BUNDLE_PATH: "vendor/bundle"

envoy/http/app/Dockerfile

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+FROM rubylang/ruby:2.6.5-bionic
+
+RUN mkdir -p /app
+
+# bundle install
+COPY Gemfile Gemfile.lock /tmp/
+RUN cd /tmp && bundle install -j4 --deployment --without 'development test'
+
+WORKDIR /app
+COPY . /app
+
+CMD ["bundle", "exec", "ruby", "app.rb"]

envoy/http/app/Gemfile

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+# Gemfile
+source "https://rubygems.org"
+
+gem "sinatra"

envoy/http/app/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    mustermann (1.0.2)
+    rack (2.0.4)
+    rack-protection (2.0.1)
+      rack
+    sinatra (2.0.1)
+      mustermann (~> 1.0)
+      rack (~> 2.0)
+      rack-protection (= 2.0.1)
+      tilt (~> 2.0)
+    tilt (2.0.8)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  sinatra
+
+BUNDLED WITH
+   1.14.6

envoy/http/app/app.rb

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+# app.rb
+require "sinatra"
+
+set :bind, '0.0.0.0'
+set :port,  3000
+
+get "/" do
+
+  puts request.env
+  p request.env
+  # status 500
+  status 200
+  # "Hello World!"
+end

envoy/http/docker-compose.yml

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+version: '2.4'
+services:
+  front-envoy:
+    image: envoyproxy/envoy:v1.15.0
+    container_name: proxy
+    volumes:
+      - ./envoy.yaml:/etc/envoy/envoy.yaml
+    ports:
+      - "80:8080"
+      - "9901:9901"
+  app:
+    build: ./app
+    container_name: app
+    ports:
+      - 8080:8080

envoy/http/envoy.yaml

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+admin:
+  access_log_path: /dev/stdout
+  address:
+    socket_address: { address: 0.0.0.0, port_value: 9901 }
+static_resources:
+  listeners:
+  - name: app
+    address:
+      socket_address: { address: 0.0.0.0, port_value: 8080 }
+    filter_chains:
+    - filters:
+      - name: envoy.filters.network.http_connection_manager
+        typed_config:
+          "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
+          stat_prefix: ingress_http
+          access_log:
+            - name: envoy.access_loggers.file
+              typed_config:
+                "@type": type.googleapis.com/envoy.extensions.access_loggers.file.v3.FileAccessLog
+                path: '/dev/stdout'
+          route_config:
+            name: local_route
+            virtual_hosts:
+            - name: local_service
+              domains: ["*"]
+              routes:
+              - match:
+                  prefix: "/"
+                route:
+                  cluster: backend_cluster
+          http_filters:
+          - name: envoy.filters.http.router
+  clusters:
+  - name: backend_cluster
+    connect_timeout: 0.25s
+    type: LOGICAL_DNS
+    dns_lookup_family: V4_ONLY
+    lb_policy: ROUND_ROBIN
+    load_assignment:
+      cluster_name: app
+      endpoints:
+      - lb_endpoints:
+        - endpoint:
+            address:
+              socket_address: { address: app, port_value: 3000 }