The "when not in" condition is particularly useful in scenarios where you need to install certain packages on servers, but only if they are not already present. For example, in a multi-environment setup, you may want to install additional packages on specific servers that are not part of th...
- name: this command prints FAILED when it fails command: /usr/bin/example-command -x -y -z register: command_result failed_when: "'FAILED' in command_result.stderr" 1. 2. 3. 4. 直接通过fail模块和when条件语句: - name: this command prints FAILED when it fails command: /usr/bin/ex...
重点检查一下cpu的变量是否有改变,这里可以看到,跟我们ansible_processor_vcpus的值是一样,这样符合我们预期,此处就展示完毕 条件测试:when语句:在tasks中使用,Jinja2的语法格式; 示例:利用Ansible条件测试在CentOS_6和CentOS_7的启动服务 这边首先增加一台ip为10.1.156.70的CentOS7的主机 然后我们利用setup模块的命令 ...
when: " command_result.stderr and 'FAILED' in command_result.stderr" ansible一旦执行返回失败,后续操作就会中止,所以failed_when通常可以用于满足某种条件时主动中止playbook运行的一种方式。 ansible默认处理错误的机制是遇到错误就停止执行。但有些时候,有些错误是计划之中的。我们希望忽略这些错误,以让playbook继...
This may be useful when # wanting to use, for example, IP information from one group of servers # without having to talk to them in the same playbook run to get their # current IP information. #fact_caching = memory #This option tells Ansible where to cache facts. The value is plugin...
[WARNING]: Could not match supplied host pattern, ignoring: 10.0.0.133 [WARNING]: No hosts matched, nothing to do 使用host文件执行命令 [root@mcw1 ~]$ cat mcw.txt [mcw] 10.0.0.132 #免密 10.0.0.133 #不免密 [root@mcw1 ~]$ ansible -i mcw.txt mcw -m shell -a "hostname" ...
unique, and changing the "name" value will result in a new cron task being created (or a different one being removed). When environment variables are managed, no comment line is added, but, when the module needs to find/check the state, it uses the "name" parameter to find the environ...
examples!removes # a filename,when it does not exist,thisstep will*not*be run.warn #ifcommand warnings are oninansible.cfg,donot warn aboutthisparticular lineifsetto no/false.[root@node1~]#[root@node1~]# ansible-doc-s command-name:Executes a command on a remote nodeaction:command ...
When enabled, this option allows lookup plugins (whether used in variables as {{lookup('foo')}} or as a loop as with_foo) to return data that is not marked ‘unsafe’. By default, such data is marked as unsafe to prevent the templating engine from evaluating any jinja2 templating langua...
When you type something directly at the command line, you may feel that your hand-crafted values should override all others, but Ansible does not work that way. Command-line options have low precedence - they override configuration only. They do not override playbook keywords, variables from inv...