diff --git a/.travis.yml b/.travis.yml
index 6a81584..2b0603e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,54 +3,58 @@
 
 sudo: required
 env:
-  # - >
-  #   DISTRIBUTION=ubuntu-upstart
-  #   DIST_VERSION=14.04
-  #   MONGODB_VERSION=3.2
-  # - >
-  #   DISTRIBUTION=ubuntu-upstart
-  #   DIST_VERSION=14.04
-  #   MONGODB_VERSION=3.0
-  # - >
-  #   DISTRIBUTION=ubuntu-upstart
-  #   DIST_VERSION=14.04
-  #   MONGODB_VERSION=2.6
-  # - >
-  #   DISTRIBUTION=ubuntu-upstart
-  #   DIST_VERSION=12.04-builded
-  #   MONGODB_VERSION=3.2
-  # - >
-  #   DISTRIBUTION=ubuntu-upstart
-  #   DIST_VERSION=12.04-builded
-  #   MONGODB_VERSION=3.0
-  # - >
-  #   DISTRIBUTION=ubuntu-upstart
-  #   DIST_VERSION=12.04-builded
-  #   MONGODB_VERSION=2.6
-  # - >
-  #   DISTRIBUTION=centos
-  #   DIST_VERSION=6
-  #   MONGODB_VERSION=2.6
-  # - >
-  #   DISTRIBUTION=centos
-  #   DIST_VERSION=6
-  #   MONGODB_VERSION=3.0
-  # - >
-  #   DISTRIBUTION=centos
-  #   DIST_VERSION=6
-  #   MONGODB_VERSION=3.2
-  # - >
-  #   DISTRIBUTION=centos
-  #   DIST_VERSION=7
-  #   MONGODB_VERSION=2.6
-  # - >
-  #   DISTRIBUTION=centos
-  #   DIST_VERSION=7
-  #   MONGODB_VERSION=3.0
-  # - >
-  #   DISTRIBUTION=centos
-  #   DIST_VERSION=7
-  #   MONGODB_VERSION=3.2
+  - >
+    DISTRIBUTION=ubuntu-upstart
+    DIST_VERSION=14.04
+    MONGODB_VERSION=3.2
+  - >
+    DISTRIBUTION=ubuntu-upstart
+    DIST_VERSION=14.04
+    MONGODB_VERSION=3.0
+  - >
+    DISTRIBUTION=ubuntu-upstart
+    DIST_VERSION=14.04
+    MONGODB_VERSION=2.6
+  - >
+    DISTRIBUTION=ubuntu-upstart
+    DIST_VERSION=12.04-builded
+    MONGODB_VERSION=3.2
+  - >
+    DISTRIBUTION=ubuntu-upstart
+    DIST_VERSION=12.04-builded
+    MONGODB_VERSION=3.0
+  - >
+    DISTRIBUTION=ubuntu-upstart
+    DIST_VERSION=12.04-builded
+    MONGODB_VERSION=2.6
+  - >
+    DISTRIBUTION=centos
+    DIST_VERSION=6-builded
+    MONGODB_VERSION=2.6
+  - >
+    DISTRIBUTION=centos
+    DIST_VERSION=6-builded
+    MONGODB_VERSION=3.0
+  - >
+    DISTRIBUTION=centos
+    DIST_VERSION=6-builded
+    MONGODB_VERSION=3.2
+  - >
+    DISTRIBUTION=centos
+    DIST_VERSION=6-builded
+    MONGODB_VERSION=3.4
+  - >
+    DISTRIBUTION=centos
+    DIST_VERSION=7-builded
+    MONGODB_VERSION=2.6
+  - >
+    DISTRIBUTION=centos
+    DIST_VERSION=7-builded
+    MONGODB_VERSION=3.0
+  - >
+    DISTRIBUTION=centos
+    DIST_VERSION=7-builded
+    MONGODB_VERSION=3.2
   - >
     DISTRIBUTION=centos
     DIST_VERSION=7-builded
diff --git a/tests/Dockerfile.centos_6-builded b/tests/Dockerfile.centos_6-builded
new file mode 100644
index 0000000..06fb3b3
--- /dev/null
+++ b/tests/Dockerfile.centos_6-builded
@@ -0,0 +1,13 @@
+FROM centos:6
+
+# This is needed so that ansible managed to read "ansible_default_ipv4"
+RUN yum install iproute -y 
+
+# This step is needed since standard CentOS docker image does not come with EPEL installed by default
+RUN yum install epel-release -y
+
+# we can has SSH
+EXPOSE 22
+
+# pepare for takeoff
+CMD ["/usr/sbin/init"]
diff --git a/tests/site.yml b/tests/site.yml
index b6934dc..f6d861f 100644
--- a/tests/site.yml
+++ b/tests/site.yml
@@ -20,10 +20,7 @@
 - hosts: "{{ target }}"
   become: no
   gather_facts: yes
-  pre_tasks:
-    - name: Show hostvars
-      debug:
-        var: "hostvars[inventory_hostname]['ansible_default_ipv4']"
+
   roles:
     - role: greendayonfire.mongodb
       when: "'mongo_master' in group_names"