ansible-语法

--- 
- hosts: test70 
vars: 
testvar1: testfile 
remote_user: root 
tasks: 
- name: task1 
file: 
path: /testdir/{{ testvar1 }} 
state: touch 

vars: 
testvar1: testfile 
testvar2: testfile2 

--- 
- hosts: test70 
remote_user: root 
vars: 
nginx: 
conf80: /etc/nginx/conf.d/80.conf 
conf8080: /etc/nginx/conf.d/8080.conf 
tasks: 
- name: task1 
file: 
path: "{{nginx.conf80}}" 
state: touch 
- name: task2 
file: 
path: "{{nginx.conf8080}}" 
state: touch 

# cat nginx_vars.yml 
nginx: 
conf80: /etc/nginx/conf.d/80.conf 
conf8080: /etc/nginx/conf.d/8080.conf 
--- 
- hosts: test70 
remote_user: root 
vars_files: 
- /testdir/ansible/nginx_vars.yml 
tasks: 
- name: task1 
file: 
path={{nginx.conf80}} 
state=touch 
- name: task2 
file: 
path={{nginx['conf8080']}} 
state=touch 

ansible test70 -m setup 

ansible test70 -m setup -a 'filter=ansible_memory_mb' 
ansible test70 -m setup -a "filter=*mb*" 

//例子1： 通过循环输出为分组的信息 
--- 
- hosts: test70 
remote_user: root 
gather_facts: no 
tasks: 
- debug: 
msg: "{{item}}" 
with_items: "{{groups.ungrouped}}" 
//例子2： 通过debugger输出循环 1 2 3 
--- 
- hosts: test70 
remote_user: root 
gather_facts: no 
tasks: 
- debug: 
msg: "{{item}}" 
with_items: 
- 1 
- 2 
- 3 
//例子3 通过循环创建4个file 
--- 
- hosts: test70 
remote_user: root 
gather_facts: no 
vars: 
dirs: 
- "/opt/a" 
- "/opt/b" 
- "/opt/c" 
- "/opt/d" 
tasks: 
- file: 
path: "{{item}}" 
state: touch 
with_items: "{{dirs}}" 
//例子4 循环体是对象信息 
--- 
- hosts: test70 
remote_user: root 
gather_facts: no 
tasks: 
- debug: 
msg: "{{item.test1}}" 
with_items: 
- { test1: a, test2: b } 
- { test1: c, test2: d } 

//ansible_distribution 是一个变量正常来说是要{{ansible_distribution }}来引用但是在when中不用 
//例子2 只有ansible_distribution 等于 "CentOS"才输出 "System release is centos" 
--- 
- hosts: test70 
remote_user: root 
tasks: 
- debug: 
msg: "System release is centos" 
when: ansible_distribution == "CentOS" 
//例子2 当item 的值大于1才输出 
--- 
- hosts: test70 
remote_user: root 
gather_facts: no 
tasks: 
- debug: 
msg: "{{ item }}" 
with_items: 
- 1 
- 2 
- 3 
when: item > 1 
//例子3 多个条件 
--- 
- hosts: test70 
remote_user: root 
tasks: 
- debug: 
msg: "System release is centos7" 
when: ansible_distribution == "CentOS" and ansible_distribution_major_version == "7" 

when: '"no such file" in super_status.stdout' 
//判断是否含有字符串（从而判断supervisor是否启动supervisor 这个是弱智方法） 
- name: juge supervisor status 
shell: supervisorctl status 
register: super_status 
ignore_errors: yes 
- name: print info 
debug: var=super_status 
- name: start supervisor 
shell: /usr/bin/supervisord -c /etc/supervisor/supervisord.conf 
when: '"no such file" in super_status.stdout' 
改造后的2020.06. 
- name: juge supervisor status 
shell: ps -ef | grep '/usr/bin/supervisord -c /etc/supervisor/supervisord.conf' | grep -v grep | wc -l 
register: super_status 
- name: 'print info super_status' 
debug: 
msg: var=super_status 
- name: start supervisor 
shell: /usr/bin/supervisord -c /etc/supervisor/supervisord.conf 
when: super_status.stdout|int < 1 
//debug引用register变量使用var关键字 并且不能跟msg同时使用 
--- 
- name: chek supervisor is exists 
stat: path=/usr/bin/supervisord 
register: supervisor_bin 
- name: install pip 
easy_install: name=supervisor 
when: not supervisor_bin.stat.exists 
tags: install_pip 
- name: print info 
debug: var=supervisor_bin 

在命令模式下敲斜杆( / )这时在状态栏（也就是屏幕左下脚）就出现了 “/” 然后输入你要查找的关键字敲回车就可以了。 
如果你要继续查找此关键字，敲字符 n 就可以继续查找了。 

ansible这类远程执行的non-login shell 并不会加载/etc/profile和~/.bash_profile下的环境变量 
只是加载“~/.bashrc”和/etc/bashrc 如果需要在ansible中执行需要特定环境变量的命令，可以将环境变量写在~/.bashrc 并 source一下~/.bash_profile 。