06-Ansible判断

[student@workstation ansible]$ cat one.yml
- hosts: all
  remote_user: root
  tasks:
  - name: 0.clean yum
    shell: rm -rf /etc/yum.repos.d/*
    when: ansible_os_family == "RedHat"

  - name: 1.install ali source
    get_url: url=http://mirrors.aliyun.com/repo/Centos-7.repo dest=/etc/yum.repos.d/CentOS-Base.repo mode=0644 force=yes
    when: ansible_os_family == "RedHat"
  
  - name: 2.change yum
    shell: sed -ri 's#\$releasever#7#g' /etc/yum.repos.d/CentOS-Base.repo && yum makecache
    when: ansible_os_family == "RedHat"

  - name: 3-1.Redhat family install web server
    yum: name=httpd state=latest
    when: ansible_os_family == "RedHat"

  - name: 3-2.Debian faily install web server
    apt: name=apache2 state=latest
    when: ansible_os_family == "Debian"

[student@workstation ansible]$ cat when_in.yml 
- hosts: all
  tasks:
  - yum:
     name: httpd
     state: latest
    #如果当前主机在webservers组中就执行安装httpd的任务
    when: ansible_hostname in groups['webservers']

- hosts: all
  tasks:
  - shell: 'reboot now'
    #如果不是admin组的主机就直接重启
    when: ansible_hostname not in groups['admin']

- hosts: all
  remote_user: root

  tasks:
  - name: compare os version

    debug:
     msg: "System is RedHat6 or Redhat7 And host not host2"

    when: ansible_distribution == "RedHat"  and (ansible_distribution_major_version == "6" or ansible_distribution_major_version == "7") and (not ansible_nodename == "host2")

[student@workstation ansible]$ cat var_define.yml
- hosts: servera
  gather_facts: no
  vars:
    keys:
  tasks:
  - debug:
     msg: "ansible_hostname is not defined"
    when: ansible_hostname is undefined
  
  - debug:
     msg: "key is defined"
    when: keys is defined

  - debug:
     msg: "keys is none"
    when: keys is none

[student@workstation ansible]$ cat status.yml
- hosts: servera
  gather_facts: no
  tasks:
  - shell: ls /home/
	register: retmsg

  - debug:
     msg: 
     - "runing successfully"
     - " {{ retmsg.stdout }}"
	when: retmsg is succeeded
	
  - debug:
     msg: 
     - "runing successfully"
     - " {{ retmsg.stdout }}"
	when: retmsg is failed
	
  - debug:
     msg: 
     - "runing successfully"
     - " {{ retmsg.stdout }}"
    when: retmsg is change
    
  - debug:
     msg: 
     - "runing successfully"
     - " {{ retmsg.stdout }}"
    when: retmsg is skipped

[student@workstation ansible]$ cat when_other.yml
- hosts: servera
  gather_facts: no
  vars:
   comment: "wolala wolala wolalala"
   age: 13
  tasks:
  - debug:
     msg: "This is string"
    when: comment is string

  - debug:
     msg: "This is lower"
    when: comment is lower

  - debug:
     msg: "This not upper"
    when: comment is not upper

  - debug:
     msg: "This is not even"
    when: age is not even

  - debug:
     msg: "This is odd"
    when: age is odd

  - debug:
     msg: "This is number"
    when: age is number