1.在/etc/hosts 文件中解析4台主机名

2.在/etc/ansible/hosts中添加主机：

[lb]
node1
[tcsrvs]
node[2:3]

3. 基于私钥认证免密码连接：

ssh-keygen -t rsa -P ''
ssh-copy-id -i ~/.ssh/id_rsa.pub root@node{1,2,3,4}

4.ansible all --list-hosts验证是否连接成功

5.对于nginx角色：

mkdir -pv /etc/ansible/roles/{nginx,tomcat}/{files,templates,tasks,handlers,vars,meta,default}

vim task/main.yml
-name: install nginx
  yum : name=nginx state=lastest
  when ：ansible_os_family == "RedHat"
- name : install conf 
  copy ： src = lb.conf dest=/etc/nginx/conf.d
  tags: conf 
  notify: restart nginx
- name : start nginx
  service :name=nginx state=started enabled=yes

vim handlers/main.yml
- name:restart nginx
  service : name=nginx state=restarted

vim files/lb.conf
upstream tcsrvs{
    server node1:8080;
    server node2:8080;
}
server{
    listen 80;
    server_name www.ilinux.io;
    location / {
        proxy_pass http://tcsrvs;
    }
}

mkdir playbook/      cd /playbook
vim nt.yml
- host ： lb
  remote_user: root
  roles:
  - nginx

ansible-playbook -C nt.yml ----->至此nginx主机配置完成   

6 配置tomcat,jdk角色

cd /etc/ansible/roles/tomcat/
vim tasks/main.yml
- name : install package
  yum : name={{ item }} state=lastest
  with_items:
  - tomcat 
  -tomcat-admin-webapps
  -tomcat-webapps
  -tomcat-docs-webapps
  when: ansible_os_faminly == "RedHAT"
  -name : start tomcat
  service: name=tomcat state=started enabled=yes
 因为tomcat需要依赖jdk所以另外需要建立一个jdk的角色：
    mkdir jdk/{files,templates,tasks,vars,handlers}
vim tasks/main.yml 
    -name : install jdk
    yum : name=java-{{ version }}-openjdk-devel state=lastest
    name: install env file
    copy: src=java.sh dest=/etc/profile.d/

vim /files/java.sh
     export ....

vim /vars/main.yml
    vertion: 1.8.0

在之前的nt.yml文件中添加一段：

-host: tcsrvs
remote_user: root
roles:
- jdk
- tomcat

ansible-playbook -C nt.yml