add more logging

packages/health-check/Dockerfile

@@ -23,14 +23,15 @@ COPY bin bin
 EXPOSE 3100
 ENV NODE_ENV production
 
-# 1. start dnsmasq in the background with:
+# 1. get public server ip and save it in /etc/environment (passed to cron tasks as env variable)
+# 2. start dnsmasq in the background with:
 #    - alias PORTAL_DOMAIN with current server ip so it overrides potential load balancer request
 #    - default docker nameserver 127.0.0.11 for any other request
-# 2. replace docker nameserver with dnsmasq nameserver in /etc/resolv.conf
-# 3. start crond in the background to schedule periodic health checks
-# 4. start the health-check api service
+# 3. replace docker nameserver with dnsmasq nameserver in /etc/resolv.conf
+# 4. start crond in the background to schedule periodic health checks
+# 5. start the health-check api service
 CMD [ "sh", "-c", \
-      "serverip=$(node src/whatismyip.js) && \
+      "export serverip=$(node src/whatismyip.js) && \
        echo \"export serverip=${serverip}\" >> /etc/environment && \
        dnsmasq --no-resolv --log-facility=/var/log/dnsmasq.log --address=/$PORTAL_DOMAIN/$serverip --server=127.0.0.11 && \
        echo \"$(sed 's/127.0.0.11/127.0.0.1/' /etc/resolv.conf)\" > /etc/resolv.conf && \

packages/health-check/src/checks/middleware.js

@@ -3,11 +3,20 @@ const { ipCheckService, ipRegex } = require("../utils");
 
 const getCurrentAddress = async () => {
   // use serverip env variable when available (set via Dockerfile)
-  if (process.env.serverip) return process.env.serverip;
+  if (process.env.serverip) {
+    if (ipRegex.test(process.env.serverip)) return process.env.serverip;
+
+    // log error to console for future reference but do not break
+    console.log(`Environment variable serverip contains invalid ip: "${process.env.serverip}"`);
+  }
 
   try {
     const { body } = await got(`http://${ipCheckService}`);
-    if (ipRegex.test(body)) return body;
+    if (ipRegex.test(body)) {
+      console.info(`Server public ip: ${body} (source: ${ipCheckService})`);
+
+      return body;
+    }
 
     throw new Error(`${ipCheckService} responded with invalid ip: "${body}"`);
   } catch (error) {

packages/health-check/src/index.js

@@ -42,4 +42,10 @@ server.listen(port, host, (error) => {
   if (error) throw error;
 
   console.info(`Server listening at http://${host}:${port} (NODE_ENV: ${process.env.NODE_ENV})`);
+
+  const { ipRegex } = require("./utils");
+
+  if (ipRegex.test(process.env.serverip)) {
+    console.info(`Server public ip: ${process.env.serverip}`);
+  }
 });