```c [root@mac-vm-temp ~]# ansible-playbook install.yml --syntax-check ERROR! 'when' is not a valid attribute for a Play  The error appears to be in '/root/install.yml': line 1, column 3, but may be elsewhere in the file depending on the exact syntax problem.  The offending line appears to be:   - name: install tools for compiling native addons from npm   ^ here  

 yml内容:`--- - name: install tools   yum: name=open state=present  ~                                ` ```c  把when条件删除后又报错  ```c [root@mac-vm-temp ~]# ansible-playbook install.yml --syntax-check ERROR! 'yum' is not a valid attribute for a Play  The error appears to be in '/root/install.yml': line 1, column 3, but may be elsewhere in the file depending on the exact syntax problem.  The offending line appears to be:   - name: install tools for compiling native addons from npm   ^ here  

怀疑是系统版本或ansible版本版本过低，所以yum模块无法使用，为了验证yum模块的问题，不适用playbook，直接用命令执行

[root@mac-vm-temp ~]# ansible all -m yum -a "name=nginx " 10.0.0.1| SUCCESS => {     "ansible_facts": {         "discovered_interpreter_python": "/usr/bin/python"     },      "changed": false,      "msg": "",      "rc": 0,      "results": [         "1:nginx-1.20.1-10.el7.x86_64 providing nginx is already installed"     ] }  

基本确认不是yum模块问题导致的，所以还是语法上有问题。

--- - hosts: tan   tasks:   - name: install tools     yum:       name: nginx       state: present 

修改后，正常了。
[root@mac-vm-temp ~]# ansible-playbook nginx.yml --syntax-check

playbook: nginx.yml