diff --git a/inventory/group_vars/copr-back b/inventory/group_vars/copr-back
index 152a2258c4..83b0b266d0 100644
--- a/inventory/group_vars/copr-back
+++ b/inventory/group_vars/copr-back
@@ -7,8 +7,8 @@ copr_nova_tenant_name: "copr"
 copr_nova_username: "copr"
 
 # copr_builder_image_name: "Fedora-Cloud-Base-20141203-21"
-copr_builder_image_name: "builder-2015-05-25"
-copr_builder_flavor_name: "m1.builder"
+copr_builder_image_name: "builder-2015-05-27"
+copr_builder_flavor_name: "ms2.builder"
 copr_builder_network_name: "copr-net"
 copr_builder_key_name: "buildsys"
 copr_builder_security_groups: "ssh-anywhere-copr,default,ssh-from-persistent-copr"
diff --git a/inventory/group_vars/copr-back-stg b/inventory/group_vars/copr-back-stg
index db820572f4..49a0a4818f 100644
--- a/inventory/group_vars/copr-back-stg
+++ b/inventory/group_vars/copr-back-stg
@@ -6,8 +6,8 @@ copr_nova_tenant_id: "566a072fb1694950998ad191fee3833b"
 copr_nova_tenant_name: "coprdev"
 copr_nova_username: "copr"
 
-copr_builder_image_name: "builder-2015-05-25"
-copr_builder_flavor_name: "m1.builder"
+copr_builder_image_name: "builder-2015-05-27"
+copr_builder_flavor_name: "ms2.builder"
 copr_builder_network_name: "coprdev-net"
 copr_builder_key_name: "buildsys"
 copr_builder_security_groups: "ssh-anywhere-coprdev,default,ssh-from-persistent-coprdev"
diff --git a/roles/copr/backend/files/provision/files/mock/site-defaults.cfg b/roles/copr/backend/files/provision/files/mock/site-defaults.cfg
index b564371ce5..65b02da63e 100644
--- a/roles/copr/backend/files/provision/files/mock/site-defaults.cfg
+++ b/roles/copr/backend/files/provision/files/mock/site-defaults.cfg
@@ -14,3 +14,10 @@ config_opts['plugin_conf']['bind_mount_enable'] = False
 config_opts['plugin_conf']['compress_logs_enable'] = True
 config_opts['plugin_conf']['compress_logs_opts'] = {}
 config_opts['plugin_conf']['compress_logs_opts']['command'] = "/usr/bin/gzip -9 --force"
+
+config_opts['plugin_conf']['tmpfs_enable'] = True
+config_opts['plugin_conf']['tmpfs_opts'] = {}
+config_opts['plugin_conf']['tmpfs_opts']['required_ram_mb'] = 1024
+config_opts['plugin_conf']['tmpfs_opts']['max_fs_size'] = '50g'
+config_opts['plugin_conf']['tmpfs_opts']['mode'] = '0755'
+config_opts['plugin_conf']['tmpfs_opts']['keep_mounted'] = False