diff --git a/src/platform.js b/src/platform.js
index bbbc79bef..446aa13cb 100644
--- a/src/platform.js
+++ b/src/platform.js
@@ -65,7 +65,6 @@ function start(callback) {
         startApps.bind(null, existingInfra),
         graphs.startGraphite.bind(null, existingInfra),
         addons.startAddons.bind(null, existingInfra),
-        pruneInfraImages,
         fs.writeFile.bind(fs, paths.INFRA_VERSION_FILE, JSON.stringify(infra, null, 4))
     ], function (error) {
         if (error) return callback(error);
@@ -86,7 +85,9 @@ function onPlatformReady() {
     debug('onPlatformReady: platform is ready');
     exports._isReady = true;
     taskmanager.resumeTasks();
+
     applyPlatformConfig(NOOP_CALLBACK);
+    pruneInfraImages(NOOP_CALLBACK);
 }
 
 function applyPlatformConfig(callback) {
@@ -110,9 +111,9 @@ function pruneInfraImages(callback) {
     debug('pruneInfraImages: checking existing images');
 
     // cannot blindly remove all unused images since redis image may not be used
-    let images = infra.baseImages.concat(Object.keys(infra.images).map(function (addon) { return infra.images[addon]; }));
+    const images = infra.baseImages.concat(Object.keys(infra.images).map(function (addon) { return infra.images[addon]; }));
 
-    for (let image of images) {
+    async.eachSeries(images, function (image, iteratorCallback) {
         let output = execSync(`docker images --digests ${image.repo} --format "{{.ID}} {{.Repository}}:{{.Tag}}@{{.Digest}}"`, { encoding: 'utf8' });
         let lines = output.trim().split('\n');
         for (let line of lines) {
@@ -120,11 +121,10 @@ function pruneInfraImages(callback) {
             let parts = line.split(' '); // [ ID, Repo:Tag@Digest ]
             if (image.tag === parts[1]) continue; // keep
             debug(`pruneInfraImages: removing unused image of ${image.repo}: ${line}`);
-            shell.execSync('pruneInfraImages', `docker rmi ${parts[0]}`);
-        }
-    }
 
-    callback();
+            shell.exec('pruneInfraImages', `docker rmi ${parts[0]}`, iteratorCallback);
+        }
+    }, callback);
 }
 
 function stopContainers(existingInfra, callback) {
diff --git a/src/shell.js b/src/shell.js
index 87dda5e54..c476307aa 100644
--- a/src/shell.js
+++ b/src/shell.js
@@ -2,6 +2,7 @@
 
 exports = module.exports = {
     spawn: spawn,
+    exec: exec,
     execSync: execSync,
     sudo: sudo,
     sudoSync: sudoSync
@@ -29,6 +30,21 @@ function execSync(tag, cmd, callback) {
     if (callback) callback();
 }
 
+function exec(tag, cmd, callback) {
+    assert.strictEqual(typeof tag, 'string');
+    assert.strictEqual(typeof cmd, 'string');
+    assert.strictEqual(typeof callback, 'function');
+
+    debug(`${tag} exec: ${cmd}`);
+
+    child_process.execSync(cmd, function (error, stdout, stderr) {
+        debug(`${tag} (stdout): %s`, stdout.toString('utf8'));
+        debug(`${tag} (stderr): %s`, stderr.toString('utf8'));
+
+        callback(error);
+    });
+}
+
 function spawn(tag, file, args, options, callback) {
     assert.strictEqual(typeof tag, 'string');
     assert.strictEqual(typeof file, 'string');
@@ -38,7 +54,7 @@ function spawn(tag, file, args, options, callback) {
 
     callback = once(callback); // exit may or may not be called after an 'error'
 
-    debug(tag + ' execFile: %s %s', file, args.join(' '));
+    debug(tag + ' spawn: %s %s', file, args.join(' '));
 
     var cp = child_process.spawn(file, args, options);
     if (options.logStream) {
@@ -50,7 +66,7 @@ function spawn(tag, file, args, options, callback) {
         });
 
         cp.stderr.on('data', function (data) {
-            debug(tag + ' (stderr): %s', data.toString('utf8'));
+            debug(tag + ' (stdout): %s', data.toString('utf8'));
         });
     }