Merge pull request #1543 from hedgedoc/feat/db_reconnect

app.js

@@ -272,6 +272,9 @@ function startListen () {
   }
 }
 
+const maxDBTries = 30
+let currentDBTry = 1
+function syncAndListen () {
   // sync db then start listen
   models.sequelize.authenticate().then(function () {
     models.runMigrations().then(() => {
@@ -283,10 +286,24 @@ models.sequelize.authenticate().then(function () {
           if (!notes || notes.length <= 0) return startListen()
         })
       } else {
-      throw new Error('server still not ready after db synced')
+        logger.error('server still not ready after db synced')
+        process.exit(1)
       }
     })
+  }).catch(() => {
+    if (currentDBTry < maxDBTries) {
+      logger.warn(`Database cannot be reached. Try ${currentDBTry} of ${maxDBTries}.`)
+      currentDBTry++
+      setTimeout(function () {
+        syncAndListen()
+      }, 1000)
+    } else {
+      logger.error('Cannot reach database! Exiting.')
+      process.exit(1)
+    }
   })
+}
+syncAndListen()
 
 // log uncaught exception
 process.on('uncaughtException', function (err) {

public/docs/release-notes.md

@@ -6,6 +6,9 @@
   If you want to continue using Google Analytics or Disqus, you can re-enable them in the config.
   See [the docs](https://docs.hedgedoc.org/configuration/#web-security-aspects) for details.
 
+### Features
+- HedgeDoc now automatically retries connecting to the database up to 30 times on startup.
+
 ### Bugfixes
 - Fix crash when trying to read the current Git commit on startup