Support centos6 and centos7

.gitignore

@@ -4,3 +4,4 @@
 .*.sw*
 *~
 .idea/
+*.retry

tests/docker-compose.yml

@@ -1,5 +1,13 @@
 version: "3"
 services:
+  centos6:
+    build: ./dockerfiles/centos6
+    cap_add:
+      - ALL
+  centos7:
+    build: ./dockerfiles/centos7
+    cap_add:
+      - ALL
   debian8:
     build: ./dockerfiles/debian8
     cap_add:
@@ -8,3 +16,11 @@ services:
     build: ./dockerfiles/debian9
     cap_add:
       - ALL
+  ubuntu14:
+    build: ./dockerfiles/ubuntu14
+    cap_add:
+      - ALL
+  ubuntu16:
+    build: ./dockerfiles/ubuntu16
+    cap_add:
+      - ALL

tests/dockerfiles/centos6/Dockerfile

@@ -0,0 +1,11 @@
+FROM centos:6
+
+RUN useradd -ms /bin/bash user
+
+RUN yum update -y && \
+		yum install -y \
+			initscripts \
+			sudo \
+		&& yum clean all
+
+CMD ["/sbin/init"]

tests/dockerfiles/centos7/Dockerfile

@@ -0,0 +1,11 @@
+FROM centos:7
+
+RUN useradd -ms /bin/bash user
+
+RUN yum update -y && \
+    yum install -y \
+			sudo \
+			which \
+		&& yum clean all
+
+CMD ["/usr/sbin/init"]

tests/inventory

@@ -1,3 +1,9 @@
+[centos]
+tests_centos6_1 ansible_connection=docker
+tests_centos7_1 ansible_connection=docker
 [debian]
 tests_debian8_1 ansible_connection=docker
 tests_debian9_1 ansible_connection=docker
+[ubuntu]
+tests_ubuntu14_1 ansible_connection=docker
+tests_ubuntu16_1 ansible_connection=docker