修改文件nginx.conf.j2 下面行为
worker_processes {{ ansible_processor_vcpus }};
cat temnginx2.yml
- hosts: websrvs
remote_user: root
tasks:
- name: template config to remote hosts
template: src=nginx.conf.j2 dest=/etc/nginx/nginx.conf
ansible-playbook temnginx2.yml
Playbook中template算术运算
算法运算：
示例：
vim nginx.conf.j2
worker_processes {{ ansible_processor_vcpus**2 }};
worker_processes {{ ansible_processor_vcpus+2 }};
Playbook中template for if when循环
{% for vhost in nginx_vhosts %}
server { #重复执行server代码
listen {{ vhost.listen | default('80 default_server') }};
{% if vhost.server_name is defined %}
server_name {{ vhost.server_name }};
{% endif %}
{% if vhost.root is defined %}
root {{ vhost.root }};
{% endif %}
{% endfor %}
when条件判断
- hosts: websrvs
remote_user: root
tasks:
- name: add group nginx
tags: user
user: name=nginx state=present
- name: add user nginx
user: name=nginx state=present group=nginx
- name: Install Nginx
yum: name=nginx state=present
- name: restart Nginx
service: name=nginx state=restarted
when: ansible_distribution_major_version == "6"
示例：
tasks:
- name: install conf file to centos7
template: src=nginx.conf.c7.j2 dest=/etc/nginx/nginx.conf
when: ansible_distribution_major_version == "7"
- name: install conf file to centos6
template: src=nginx.conf.c6.j2 dest=/etc/nginx/nginx.conf
when: ansible_distribution_major_version == "6"
迭代：with_items
迭代：当有需要重复性执行的任务时，可以使用迭代机制
> 对迭代项的引用，固定变量名为"item"
> 要在task中使用with_items给定要迭代的元素列表
> 列表格式：
字符串
字典
示例： 创建用户
- name: add several users
user: name={{ item }} state=present groups=wheel #{{ item }} 系统自定义变量
with_items: # 定义{{ item }} 的值和个数
- testuser1
- testuser2
上面语句的功能等同于下面的语句：
- name: add user testuser1
user: name=testuser1 state=present groups=wheel
- name: add user testuser2
user: name=testuser2 state=present groups=wheel
with_items中可以使用元素还可为hashes
示例：
- name: add several users
user: name={{ item.name }} state=present groups={{ item.groups }}
with_items:
- { name: 'testuser1', groups: 'wheel' }
- { name: 'testuser2', groups: 'root' }
ansible的循环机制还有更多的高级功能，具体请参见官方文档
http://docs.ansible.com/playbooks_loops.html
示例：将多个文件进行copy到被控端
---
- hosts: testsrv
remote_user: root
tasks
- name: Create rsyncd config
copy: src={{ item }} dest=/etc/{{ item }}
with_items:
- rsyncd.secrets
- rsyncd.conf
with_itmes 嵌套子变量
with_itmes 嵌套子变量
示例
---
- hosts: testweb
remote_user: root
tasks:
- name: add several users
user: name={{ item.name }} state=present groups={{ item.groups }}
with_items:
- { name: 'testuser1' , groups: 'wheel'}
- { name: 'testuser2' , groups: 'root'}