#### 下载并安装 VirtualBox
https://www.virtualbox.org/wiki/Downloads
#### 下载 CentOS 7
https://www.osboxes.org/centos/ 

创建一个centos-template
clone ansible-controller
clone ansible-target1
clone ansible-target2

(1)
#### 修改host name
sudo vi /etc/hostname
sudo vi /etc/hosts
shutdown now -r
(2)
#### ansiblecontroller
[osboxes@ansiblecontroller ~]$ cat /etc/hostname
ansiblecontroller
[osboxes@ansiblecontroller ~]$ cat /etc/hosts
127.0.0.1   localhost ansiblecontroller
::1         localhost ansiblecontroller
[osboxes@ansiblecontroller ~]$
(3)
#### target1
[osboxes@target1 ~]$ cat /etc/hostname
target1
[osboxes@target1 ~]$ cat /etc/hosts
127.0.0.1   localhost target1
::1         localhost target1
[osboxes@target1 ~]$
(4)
#### target2
[osboxes@target2 ~]$ cat /etc/hostname
target2
[osboxes@target2 ~]$ cat /etc/hosts
127.0.0.1   localhost target2
::1         localhost target2
[osboxes@target2 ~]$
==========================================================
#### 该命表示把Centos-7.repo下载到/etc/yum.repos.d/目录下，如果该目录下有CentOS-Base.repo，则会自动覆盖。
curl -o /etc/yum.repos.d/CentOS-Base.repo

yum clean cache
yum makecache
==========================================================
#### 安装 epel 源
yum install epel-release -y
#### 安装依赖工具
yum install git python python-pip -y
==========================================================
#### 设置EPEL仓库
cd /tmp
wget
#### 使用yum安装epel
rpm -ivh epel-release-latest-7.noarch.rpm
#### 安装ansible
yum -y install ansible

[root@ansiblecontroller tmp]# ansible --version
ansible 2.9.18
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /bin/ansible
  python version = 2.7.5 (default, Nov 16 2020, 22:23:17) [GCC 4.8.5 20150623 (Red Hat 4.8.5-44)]
[root@ansiblecontroller tmp]#