Add docker-compose to basic app

Author: stfnkth

basic-app/app-core.py

@@ -1,9 +1,12 @@
+import os
+
 from shiny import App, render, ui
 
 app_ui = ui.page_fluid(
     ui.panel_title("Hello Shiny!"),
     ui.input_slider("n", "N", 0, 100, 20),
     ui.output_text_verbatim("txt"),
+    ui.output_text_verbatim("hostname"),
 )
 
 
@@ -12,5 +15,9 @@ def server(input, output, session):
     def txt():
         return f"n*2 is {input.n() * 2}"
 
+    @render.text
+    def hostname():
+        return "hostname: " + os.getenv("HOSTNAME", "env var $HOSTNAME not set")
+
 
 app = App(app_ui, server)

basic-app/app.py

@@ -0,0 +1,23 @@
+import os
+
+from shiny import App, render, ui
+
+app_ui = ui.page_fluid(
+    ui.panel_title("Hello Shiny!"),
+    ui.input_slider("n", "N", 0, 100, 20),
+    ui.output_text_verbatim("txt"),
+    ui.output_text_verbatim("hostname"),
+)
+
+
+def server(input, output, session):
+    @render.text
+    def txt():
+        return f"n*2 is {input.n() * 2}"
+
+    @render.text
+    def hostname():
+        return "hostname: " + os.getenv("HOSTNAME", "env var $HOSTNAME not set")
+
+
+app = App(app_ui, server)

basic-app/docker-compose.lb.yml

@@ -0,0 +1,16 @@
+services:
+  nginx:
+    image: nginx:latest
+    depends_on: 
+      - shiny_app
+    ports:
+      - "8080:80"
+    volumes:
+      - ./files/nginx.conf:/etc/nginx/nginx.conf:ro
+  shiny_app:
+    build:
+      context: .
+    image: local/eoda-dev/basic-app:latest
+    restart: always
+    deploy:
+      replicas: 3

basic-app/docker-compose.yml

@@ -0,0 +1,9 @@
+services:
+  shiny_app:
+    build:
+      context: .
+    image: local/eoda-dev/basic-app:latest
+    pull_policy: always
+    ports:
+      - "3333:3333"
+    restart: always

basic-app/files/nginx.conf

@@ -0,0 +1,26 @@
+events { }
+
+http {
+    map $http_upgrade $connection_upgrade {
+        default upgrade;
+        ''      close;
+    }
+    
+    upstream shiny_app {
+        server shiny_app:3333;
+    }
+
+    server {
+        listen 80;
+        client_max_body_size 20M;
+
+        location / {
+            proxy_pass http://shiny_app;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_http_version 1.1;
+            proxy_set_header Upgrade $http_upgrade;
+            proxy_set_header Connection $connection_upgrade;
+        }
+    }
+}