1) Change the application to read parameters from environment variables if they are supplied. Otherwise read from config.js

2) Add dockerfiles that build container which can be used to run this as a web service.
3) Add dockeer-compolse.yml file which gets everything up and running!
4) To get this quickly working type:
   ```
      TLS_DASHBOARD_HOSTS=google.com,baidu.com,bing.com docker-compose up
```

Author: mvuksano

Dockerfile

@@ -0,0 +1,9 @@
+FROM alpine
+
+RUN apk --update add nodejs
+RUN npm install -g http-server
+
+COPY web_service /root/tls-dashboard/web_service
+WORKDIR /root/tls-dashboard
+
+CMD http-server web_service

Dockerfile.cron

@@ -0,0 +1,10 @@
+FROM alpine
+
+RUN apk --update add nodejs
+
+COPY node_app /root/tls-dashboard/node_app
+WORKDIR /root/tls-dashboard
+
+COPY tasks/renew-cert-info /etc/periodic/15min/renew-cert-info
+
+CMD sh -c '/etc/periodic/15min/renew-cert-info && crond -f -d 8'

docker-compose.yml

@@ -0,0 +1,19 @@
+version: '2'
+services:
+    "tls-dashboard":
+        build: .
+        image: tls-dashboard
+        ports:
+            - "8080:8080"
+        volumes:
+            - /root/tls-dashboard/web_service
+
+    "tls-dashboard-cron":
+        build:
+            context: .
+            dockerfile: Dockerfile.cron
+        image: tls-dashboard-cron
+        volumes_from:
+            - "tls-dashboard"
+        environment:
+            - TLS_DASHBOARD_HOSTS=${TLS_DASHBOARD_HOSTS}

node_app/config.js

@@ -1,9 +1,9 @@
 var config = {
-  connection_timeout : 5000,
+  connection_timeout : process.env.TLS_DASHBOARD_CONNECTION_TIMEOUT || 5000,
   output_file : {
-    path: '../web_service/js/tls-dashboard/',
-    name: 'certificates.js'
+    path: process.env.TLS_DASHBOARD_OUTPUT_DIR || './web_service/js/tls-dashboard/',
+    name: process.env.TLS_DASHBOARD_OUTPUT_FILENAME || 'certificates.js'
   }
 };
 
-module.exports = config;
+module.exports = config;

node_app/monitored_hosts.js

@@ -1,4 +1,4 @@
-var hosts = [
+var hosts =  process.env.TLS_DASHBOARD_HOSTS ? process.env.TLS_DASHBOARD_HOSTS.split(',') : [
   'www.google.com',
   'www.twitter.com',
   'sha256.badssl.com',
@@ -9,4 +9,4 @@ var hosts = [
   'example.dev',
   'vsaq.dev'
 ];
-module.exports = hosts;
+module.exports = hosts;

tasks/renew-cert-info

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+cd /root/tls-dashboard && node /root/tls-dashboard/node_app/get_cert_info.js