Ansible can be installed on CentOS or other Red Hat based systems. Firstly you should install the prerequisites:
sudo yum -y update
sudo yum -y install gcc libffi-devel openssl-devel python-pip python-devel
then install Ansible with pip:
sudo pip install ansible
I can recommend for you to upgrade the setuptools after the installation:
sudo pip install --upgrade setuptools
You can also use the local Package Manager as well:
yum install ansible