Fixed Debian 7 and 8 and Centos7 Dockerfile

centos-7/Dockerfile

@@ -1,6 +1,6 @@
 FROM centos:7
 
-RUN rpm -iU https://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-8.noarch.rpm \
+RUN yum -y install epel-release \
   && yum -y install ansible \
   && yum clean headers \
   && yum clean packages

debian-7/Dockerfile

@@ -1,15 +1,10 @@
 FROM debian:7
 
 RUN apt-get -q update \
-    && apt-get -yq install --no-install-recommends \
-      build-essential \
-      libffi-dev \
-      libssl-dev \
-      python \
-      python-dev \
-      python-pip \
-    && apt-get clean \
-    && pip install --quiet --upgrade setuptools \
-    && pip install --quiet --upgrade ansible
+    && apt-get install -y python-pip python-dev git
+
+RUN pip install --index-url=https://pypi.python.org/simple/ --upgrade pip
+
+RUN pip install git+https://github.com/ansible/ansible.git@devel
 
 CMD ["ansible-playbook", "--help"]

debian-8/Dockerfile

@@ -8,8 +8,10 @@ RUN apt-get -q update \
       python \
       python-dev \
       python-pip \
+      git \
     && apt-get clean \
-    && pip install --quiet --upgrade \
-      ansible
+    && pip install --upgrade pip
+
+RUN pip install git+https://github.com/ansible/ansible.git@devel
 
 CMD ["ansible-playbook", "--help"]