Ansible“当变量==真时"表现不如预期 [英] Ansible "when variable == true" not behaving as expected
问题描述
我正在编写的剧本中有以下任务(结果列在 <> 中的调试语句旁边):
I have the following tasks in a playbook I'm writing (results listed next to the debug statement in <>):
- debug: var=nrpe_installed.stat.exists <true>
- debug: var=force_install <true>
- debug: var=plugins_installed.stat.exists <true>
- name: Run the prep
include: prep.yml
when: (nrpe_installed.stat.exists == false or plugins_installed.stat.exists == true or force_install == true)
tags: ['prep']
- debug: var=nrpe_installed.stat.exists <true>
- debug: var=force_install <true>
- debug: var=force_nrpe_install <false>
- name: Install NRPE
include: install-nrpe.yml
when: (nrpe_installed.stat.exists == false or force_install == true or force_nrpe_install == true)
tags: ['install_nrpe']
vars:
nrpe_url: 'http://url.goes.here'
nrpe_md5: 3921ddc598312983f604541784b35a50
nrpe_version: 2.15
nrpe_artifact: nrpe-{{ nrpe_version }}.tar.gz
nagios_ip: {{ nagios_ip }}
config_dir: /home/ansible/config/
我使用以下命令运行它:
And I'm running it with the following command:
ansible-playbook install.yml -i $invFile --extra-vars="hosts=webservers force_install=True"
第一个包含运行，但第二个跳过此输出:
The first include runs, but the second skips with this output:
skipping: [server1] => {"changed": false, "skip_reason": "Conditional check failed", "skipped": true}
我的印象是条件检查应该对所有这些都通过，因为 force_install == true 评估为 true 这应该使整个 when 评估为真(因为它是一系列或").
I'm under the impression that the conditional check should pass for all of them as force_install == true evaluates to true which should make the whole when evaluate to true (since it's a series of 'OR's).
如何在适当设置变量时获得运行时间?
How do I get the when to run when the variables are set appropriately?
将 Install NRPE 的第二个时间更改为以下工作，但没有解释为什么另一个，Run the prep 正确运行:
Changing the second when for the Install NRPE include to the following works, but doesn't explain why the other one, Run the prep runs appropriately:
工作:
when: (not nrpe_installed.stat.exists or force_install or force_nrpe_install)
也在工作:
when: (nrpe_installed.stat.exists == false or plugins_installed.stat.exists == true or force_install == true)
不工作:
when: (nrpe_installed.stat.exists == false or force_install == true or force_nrpe_install == true)
<小时>
该剧特定部分的截断(删除重复)输出是:
The truncated (duplicates removed) output of that particular section of the play is:
TASK [debug] *******************************************************************
ok: [server2] => {
"nrpe_installed.stat.exists": true
}
TASK [debug] *******************************************************************
ok: [server2] => {
"plugins_installed.stat.exists": true
}
TASK [debug] *******************************************************************
ok: [server2] => {
"force_install": true
}
TASK [Run the prep] ************************************************************
included: /tasks/nrpe-install/prep.yml for server2, server3, server4, server5, server6, server7
TASK [Prep and configure for installation | Install yum packages] **************
ok: [server6] => (item=[u'gcc', u'glibc', u'glibc-common', u'gd', u'gd-devel', u'make', u'net-snmp', u'openssl-devel', u'unzip', u'tar', u'gzip', u'xinetd']) => {"changed": false, "item": ["gcc", "glibc", "glibc-common", "gd", "gd-devel", "make", "net-snmp", "openssl-devel", "unzip", "tar", "gzip", "xinetd"], "msg": "", "rc": 0, "results": ["gcc-4.1.2-55.el5.x86_64 providing gcc is already installed", "glibc-2.5-123.el5_11.3.i686 providing glibc is already installed", "glibc-common-2.5-123.el5_11.3.x86_64 providing glibc-common is already installed", "gd-2.0.33-9.4.el5_4.2.x86_64 providing gd is already installed", "gd-devel-2.0.33-9.4.el5_4.2.i386 providing gd-devel is already installed", "make-3.81-3.el5.x86_64 providing make is already installed", "net-snmp-5.3.2.2-20.el5.x86_64 providing net-snmp is already installed", "openssl-devel-0.9.8e-40.el5_11.x86_64 providing openssl-devel is already installed", "unzip-5.52-3.el5.x86_64 providing unzip is already installed", "tar-1.15.1-32.el5_8.x86_64 providing tar is already installed", "gzip-1.3.5-13.el5.centos.x86_64 providing gzip is already installed", "xinetd-2.3.14-20.el5_10.x86_64 providing xinetd is already installed"]}
TASK [Prep and configure for installation | Make nagios group] *****************
ok: [server2] => {"changed": false, "gid": 20002, "name": "nagios", "state": "present", "system": false}
TASK [Prep and configure for installation | Make nagios user] ******************
ok: [server6] => {"append": false, "changed": false, "comment": "User for Nagios NRPE", "group": 20002, "home": "/home/nagios", "move_home": false, "name": "nagios", "shell": "/bin/bash", "state": "present", "uid": 20002}
TASK [debug] *******************************************************************
ok: [server2] => {
"nrpe_installed.stat.exists": true
}
TASK [debug] *******************************************************************
ok: [server2] => {
"force_install": true
}
TASK [debug] *******************************************************************
ok: [server2] => {
"force_nrpe_install": false
}
TASK [Install NRPE] ************************************************************
skipping: [server2] => {"changed": false, "skip_reason": "Conditional check failed", "skipped": true}
推荐答案
您需要将变量转换为布尔值:
You need to convert the variable to a boolean:
force_install|bool == true
我并不声称我了解其背后的逻辑.在 python 中，任何非空字符串都应该是真实的.但是当直接用于条件时，它的计算结果为 false.
I don't claim I understand the logic behind it. In python any non-empty string should be truthy. But when directly used in a condition it evaluates to false.
bool 过滤器然后再次解释字符串 'yes', 'on', '1', 'true'(不区分大小写)和 1 为真(参见 来源).任何其他字符串都是假的.
The bool filter then again interprets the strings 'yes', 'on', '1', 'true' (case-insensitive) and 1 as true (see source). Any other string is false.
如果 force_install 未定义，您可能还想设置默认值，因为这会导致 未定义变量 错误:
You might want to also set a default value in case force_install is not defined, since it would result in an undefined variable error:
force_install|default(false)|bool == true
这篇关于Ansible“当变量==真时"表现不如预期的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
