feat: Add support for HTTP load balancing between the proxy and upstream server groups (#2173)

Add initial tests

Newlines

Remove unused variable

Co-authored-by: Richard Hansen <rhansen@rhansen.org>

Change comment value

Co-authored-by: Richard Hansen <rhansen@rhansen.org>

add missing services line

Co-authored-by: Richard Hansen <rhansen@rhansen.org>

Use deploy.replicas

Remove details about choosing a load balancing method

Feedback note

Co-authored-by: Nicolas Duchon <nicolas.duchon@gmail.com>

test/test_loadbalancing.py

@@ -0,0 +1,16 @@
+import pytest
+import re
+
+def test_loadbalance_hash(docker_compose, nginxproxy):
+    conf = nginxproxy.get_conf().decode('ASCII')
+    r1 = nginxproxy.get("http://loadbalance-enabled.nginx-proxy.tld")
+    r2 = nginxproxy.get("http://loadbalance-enabled.nginx-proxy.tld")
+    assert re.search(r"hash \$remote_addr\;", conf)
+    assert r1.status_code == 200
+    assert r2.text == r1.text
+
+def test_loadbalance_roundrobin(docker_compose, nginxproxy):
+    r1 = nginxproxy.get("http://loadbalance-disabled.nginx-proxy.tld")
+    r2 = nginxproxy.get("http://loadbalance-disabled.nginx-proxy.tld")
+    assert r1.status_code == 200
+    assert r2.text != r1.text

test/test_loadbalancing.yml

@@ -0,0 +1,27 @@
+services:
+  loadbalance-hash:
+    image: web
+    expose:
+      - "81"
+    environment:
+      WEB_PORTS: 81
+      VIRTUAL_HOST: loadbalance-enabled.nginx-proxy.tld
+    labels:
+      com.github.nginx-proxy.nginx-proxy.loadbalance: "hash $$remote_addr;"
+    deploy:
+      replicas: 2
+
+  loadbalance-roundrobin:
+    image: web
+    expose:
+      - "82"
+    environment:
+      WEB_PORTS: 82
+      VIRTUAL_HOST: loadbalance-disabled.nginx-proxy.tld
+    deploy:
+      replicas: 2
+
+  sut:
+    image: nginxproxy/nginx-proxy:test
+    volumes:
+      - /var/run/docker.sock:/tmp/docker.sock:ro