do not error if container already exists

src/scheduler.js

@@ -7,6 +7,7 @@ exports = module.exports = {
 let apps = require('./apps.js'),
     assert = require('assert'),
     async = require('async'),
+    BoxError = require('./boxerror.js'),
     constants = require('./constants.js'),
     CronJob = require('cron').CronJob,
     debug = require('debug')('box:scheduler'),
@@ -58,6 +59,7 @@ function createCronJobs(app, schedulerConfig, callback) {
         const cmd = schedulerConfig[taskName].command;
 
         docker.createSubcontainer(app, containerName, [ '/bin/sh', '-c', cmd ], { } /* options */, function (error) {
+            if (error && error.reason === BoxError.ALREADY_EXISTS) return iteratorDone();
             if (error) return iteratorDone(error);
 
             var cronJob = new CronJob({
@@ -90,7 +92,6 @@ function stopJobs(appId, appState, callback) {
         }
 
         const containerName = `${appId}-${taskName}`;
-
         docker.stopContainerByName(containerName, function (error) {
             if (error) debug(`stopJobs: failed to stop task container with name ${containerName} : ${error.message}`);
 
@@ -120,13 +121,14 @@ function sync() {
             gState = _.omit(gState, removedAppIds);
 
             async.eachSeries(allApps, function (app, iteratorDone) {
-                debug(`sync: adding jobs of ${app.id}`);
                 var appState = gState[app.id] || null;
                 var schedulerConfig = app.manifest.addons ? app.manifest.addons.scheduler : null;
 
                 if (!appState && !schedulerConfig) return iteratorDone(); // nothing to do
                 if (appState && _.isEqual(appState.schedulerConfig, schedulerConfig) && appState.cronJobs) return iteratorDone(); // nothing changed
 
+                debug(`sync: adding jobs of ${app.id}`);
+
                 stopJobs(app.id, appState, function (error) {
                     if (error) debug(`sync: error stopping jobs of ${app.id} : ${error.message}`);
 
@@ -143,6 +145,8 @@ function sync() {
                         iteratorDone();
                     });
                 });
+            }, function (error) {
+                if (error) return debug('sync: error creating jobs', error);
             });
         });
     });