ansible 条件判断与test

最新推荐文章于 2024-12-23 15:50:33 发布

转载最新推荐文章于 2024-12-23 15:50:33 发布 · 1.1k 阅读

文章标签：

#ansible #判断 #test #define #number

运维同时被 3 个专栏收录

152 篇文章

订阅专栏

linux

148 篇文章

订阅专栏

ansible

10 篇文章

订阅专栏

本文介绍了Ansible中多种判断的tests。包括针对变量、路径、字符串、整除、版本、子集等方面的判断，如判断变量是否定义、路径是否为文件、字符串大小写、能否整除指定数值等，还提及判断对象是否为字符串或数字。

1、判断的变量的一些tests
defined ：判断变量是否已经定义
undefind ：判断变量是否已经定义
none ：判断变量值是否为空

---
- hosts: test70
  remote_user: root
  gather_facts: no
  vars:
    testvar: "test"
    testvar1:
  tasks:
  - debug:
      msg: "Variable is defined"
    when: testvar is defined
  - debug:
      msg: "Variable is undefined"
    when: testvar2 is undefined
  - debug:
      msg: "The variable is defined, but there is no value"
    when: testvar1 is none

2、判断路径的一些tests
注意：如下tests中的判断均针对于ansible主机中的路径，与目标主机无关
file：判断路径是否是一个文件
directory：判断路径是否是一个目录
link：判断路径是否是一个链接
mount：判断路径是否是一个挂载点
exists：判断路径是否存在

---
- hosts: test70
  remote_user: root
  gather_facts: no
  vars:
    testpath1: "/testdir/test"
    testpath2: "/testdir/"
    testpath3: "/testdir/testsoftlink"
    testpath4: "/testdir/testhardlink"
    testpath5: "/boot"
  tasks:
  - debug:
      msg: "file"
    when: testpath1 is file
  - debug:
      msg: "directory"
    when: testpath2 is directory
  - debug:
      msg: "link"
    when: testpath3 is link
  - debug:
      msg: "link"
    when: testpath4 is link
  - debug:
      msg: "mount"
    when: testpath5 is mount
  - debug:
      msg: "exists"
    when: testpath1 is exists

3、判断字符串的一些tests
lower：判断包含字母的字符串中的字母是否是纯小写
upper：判断包含字母的字符串中的字母是否是纯大写

---
- hosts: test70
  remote_user: root
  gather_facts: no
  vars:
    str1: "abc"
    str2: "ABC"
  tasks:
  - debug:
      msg: "This string is all lowercase"
    when: str1 is lower
  - debug:
      msg: "This string is all uppercase"
    when: str2 is upper

4、判断整除的一些tests
even：判断是否为偶数
even：判断是否为奇数
divisibleby(num)：判断是否可以整除指定的数值num

---
- hosts: test70
  remote_user: root
  gather_facts: no
  vars:
    num1: 4
    num2: 7
    num3: 64
  tasks:
  - debug:
      msg: "An even number"
    when: num1 is even
  - debug:
      msg: "An odd number"
    when: num2 is odd
  - debug:
      msg: "Can be divided exactly by"
    when: num3 is divisibleby(8)

5、判断版本tests
version：可以用于对比两个版本号的大小，或者与指定的版本号进行对比，使用语法为version(‘版本号’,‘比较操作符’)

---
- hosts: test70
  remote_user: root
  vars:
    ver: 7.4.1708
    ver1: 7.4.1707
  tasks:
  - debug:
      msg: "This message can be displayed when the ver is greater than ver1"
    when: ver is version(ver1,">")
  - debug:
      msg: "system version {{ansible_distribution_version}} greater than 7.3"
    when: ansible_distribution_version is version("7.3","gt")

6、判断子集tests
subset：判断一个list是不是另一个list的子集
superset：判断一个list是不是另一个list的父集

---
- hosts: test70
  remote_user: root
  gather_facts: no
  vars:
    a:
    - 2
    - 5
    b: [1,2,3,4,5]
  tasks:
  - debug:
      msg: "A is a subset of B"
    when: a is subset(b)
  - debug:
      msg: "B is the parent set of A"
    when: b is superset(a)

7、判断字符串、数字tests
string：判断对象是否是一个字符串
number：判断对象是否是一个数字

转自：
http://www.zsythink.net/archives/2817