diff --git a/lib/singularity/runner.rb b/lib/singularity/runner.rb
index 3985aae..5b6dfb4 100644
--- a/lib/singularity/runner.rb
+++ b/lib/singularity/runner.rb
@@ -61,6 +61,7 @@ def initialize(commands, uri)
           'cpus' => @cpus,
           'numPorts' => 1
         },
+        'rackAffinity' => ['general'],
         'env' => {
           'APPLICATION_ENV' => 'production'
         },