什么是ansible?
ansible是基于模块工作的，本身没有批量部署的能力。真正具有批量部署的是ansible所运行的模块，ansible只是提供一种框架.

怎么使用?

这里以2个server(ip1,ip2)上说明
step1:install ansible of each server
yum install -u ansible
step2:change hosts of each server
vim /etc/ansible/hosts
[web_group]
ip1
ip2
step3:add ssh not need passwd to login of each server
ssh-keygen -t rsa
ssh-copy-id -i /root/.ssh/id_rsa.pub ip1
ssh-copy-id -i /root/.ssh/id_rsa.pub ip2
step4:verify
ansible all  -a ''who"

step5:add yml file
vim test.yml
---
- hosts:web_group
  remote_user:root
  tasks:
  - name:install docker
    com: yum install -y install docker
    tags: conf
    notify
    - server restart
  - name: server start
    service: name=docker state=started enabled=true
  handlers:
  - name:server restart
    service: name=docker state=restarted

step6 :run ansible
ansible-playbook install_docker.yuml

其他比较好的文章
http://ju.outofmemory.cn/entry/67581
http://docs.ansible.com/ansible/latest/index.html

遗留问题

yml 文件的格式


ssh-keygen -t rsa:命令的作用将本机的公钥复制到远程机器的authorized_keys文件中么？
我把ip1的/root/.ssh下的id_pub.rsa放到ip2 /root/.ssh下的authorized_keys
service sshd  restart ，
但是ssh ip2:任然需要使用passwd,why?