build: add Caddy load balancer

Dockerfile

@@ -130,6 +130,9 @@ FROM common AS build-production
 
 ENV ENV=PRODUCTION
 
+# Setup the FPM servie name and port
+RUN sed -i -r "s/LISTEN/${LISTEN}/g" /healthcheck.sh
+
 # Add __ONLY__ compiled extensions & their config files 
 COPY --from=extensions-builder-common /usr/local/lib/php/extensions/*/* /usr/local/lib/php/extensions/no-debug-non-zts-20230831/
 COPY --from=extensions-builder-common /usr/local/etc/php/conf.d/* /usr/local/etc/php/conf.d/

Makefile

@@ -28,7 +28,7 @@ endif
 
 #---
 
-SERVICE_APP   = app
+SERVICE_APP   = app1
 SERVICE_CADDY = caddy
 
 #---
@@ -143,7 +143,7 @@ down: ## Docker: stops the service <env=[dev|prod]>
 .PHONY: logs
 logs: ## Docker: exposes the service logs <env=[dev|prod]>
 	@$(eval env ?= 'dev')
-	@$(eval service ?= 'app')
+	@$(eval service ?= 'caddy')
 	@$(DOCKER_COMPOSE) logs $(service)
 	$(call taskDone)
 

build/dev/Caddyfile → build/Caddyfile

@@ -1,17 +1,17 @@
-(common-server) {
-    tls internal
-
+(generic) {
 	encode zstd gzip
-
     respond /healthcheck 200
-
-    php_fastcgi app:9000
-
     root * /var/www/html/public
-
     file_server
 }
 
-localhost {
-    import common-server
+(ssl) {
+    tls internal
+}
+
+{$HOSTNAME} {
+    import generic
+    import ssl
+
+    php_fastcgi {$PHP_FPM_GATEWAYS}
 }

build/healthcheck.sh

@@ -2,7 +2,7 @@
 
 set -e
 
-output=$(SCRIPT_NAME=/status/ping SCRIPT_FILENAME=/status/ping REQUEST_METHOD=GET cgi-fcgi -bind -connect app:9000 | tail -1)
+output=$(SCRIPT_NAME=/status/ping SCRIPT_FILENAME=/status/ping REQUEST_METHOD=GET cgi-fcgi -bind -connect :9000 | tail -1)
 
 if [ "$output" = "pong" ]; then
     exit 0

docker-compose.override.dev.yml

@@ -1,13 +1,16 @@
 services:
-    app:
-        build:
-            target: build-development
-        image: app:development
-        volumes:
-            - ./coverage:/coverage
-
     caddy:
-        volumes:
-            - ./build/dev/Caddyfile:/etc/caddy/Caddyfile:ro
+        environment:
+            - HOSTNAME=website.localhost
+            - PHP_FPM_GATEWAYS=app1:9000 app2:9000
         healthcheck:
             test: ["CMD", "wget", "--spider", "https://website.localhost/healthcheck"]
+        depends_on:
+            - app1
+            - app2
+
+    app2:
+        extends:
+            file: docker-compose.yml
+            service: app1
+        container_name: app2

docker-compose.override.prod.yml

@@ -1,17 +1,6 @@
 services:
-    app:
-        extends:
-            file: docker-compose.yml
-            service: app
-        build:
-            target: build-production
-        image: app:production
-
     caddy:
-        extends:
-            file: docker-compose.yml
-            service: caddy
-        volumes:
-            - ./build/prod/Caddyfile:/etc/caddy/Caddyfile:ro
+        environment:
+            - HOSTNAME=acme.com
         healthcheck:
             test: ["CMD", "wget", "--spider", "https://acme.com/healthcheck"]

docker-compose.yml

@@ -3,31 +3,38 @@ volumes:
     caddy_config:
 
 services:
-    app:
-        container_name: app
-        build:
-            context: .
-            dockerfile: Dockerfile
-        restart: unless-stopped
-        tty: true
-        volumes:
-            - ./src:/var/www/html
-
     caddy:
         container_name: caddy
         image: caddy:2.8.4-alpine
         restart: unless-stopped
+        environment:
+            - HOSTNAME=localhost
+            - PHP_FPM_GATEWAYS=app1:9000
         volumes:
             - caddy_data:/data
             - caddy_config:/config
             - ./src:/var/www/html
+            - ./build/Caddyfile:/etc/caddy/Caddyfile:ro
         ports:
             - 80:80
             - 443:443
             - 443:443/udp
         healthcheck:
+            test: ["CMD", "wget", "--spider", "https://localhost/healthcheck"]
             interval: 10s
             timeout: 1s
             retries: 3
         depends_on:
-            - app
+            - app1
+
+    app1:
+        container_name: app1
+        build:
+            context: .
+            dockerfile: Dockerfile
+            target: build-development
+        image: app:development
+        restart: unless-stopped
+        tty: true
+        volumes:
+            - ./src:/var/www/html