diff --git a/images/centos7.4/Dockerfile b/images/centos7.x/Dockerfile
similarity index 97%
rename from images/centos7.4/Dockerfile
rename to images/centos7.x/Dockerfile
index d4a082b..7026a41 100644
--- a/images/centos7.4/Dockerfile
+++ b/images/centos7.x/Dockerfile
@@ -10,7 +10,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM centos:7.4.1708
+ARG BASE_IMAGE=centos:7.8.2003
+FROM ${BASE_IMAGE}
 ENV container docker
 
 # Delete a number of unit files which might cause issues.
diff --git a/images/centos7.x/README.rst b/images/centos7.x/README.rst
new file mode 100644
index 0000000..00ebf3d
--- /dev/null
+++ b/images/centos7.x/README.rst
@@ -0,0 +1,20 @@
+
+Instructions to build Centos 7.x images to use in a clusterdock topology
+========================================================================
+
+To build a centos 7.x image, use the folowing command.
+
+``docker build . -t clusterdock/topology_nodebase:centos7.8 --build-arg BASE_IMAGE=centos7.8.2003``
+
+The build-arg BASE_IMAGE can take any valid centos 7.x tags from the official centos repo on docker hub. Some examples
+are
+
+========== ===============
+Version    Tag
+========== ===============
+Centos 7.4 centos7.4.1708
+Centos 7.5 centos7.5.1804
+Centos 7.6 centos7.6.1810
+Centos 7.8 centos7.8.2003
+========== ===============
+
diff --git a/images/centos7.4/ssh/id_rsa b/images/centos7.x/ssh/id_rsa
similarity index 100%
rename from images/centos7.4/ssh/id_rsa
rename to images/centos7.x/ssh/id_rsa
diff --git a/images/centos7.4/ssh/id_rsa.pub b/images/centos7.x/ssh/id_rsa.pub
similarity index 100%
rename from images/centos7.4/ssh/id_rsa.pub
rename to images/centos7.x/ssh/id_rsa.pub