发表于 |

ansible template 模块讲解

如果 在playbook中使用 template命令的话

ansible会在 ansible runner.py 文件中如下方式 调用 _execute_template 函数

注：至少在v0.0.2 版本的 template命令 依赖于 客户端 需要jinja2 支持

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
runner.py 版本v0.0.2 -------------
       elif self.module_name == 'template':
           result = self._execute_template(conn, host, tmp)
                    -------------
   def _execute_template(self, conn, host, tmp):
       ''' handler for template operations '''
       # load up options
       options  = self._parse_kv(self.module_args)
       source   = options['src']
       dest     = options['dest']
       metadata = options.get('metadata', None)
       if metadata is None:
           if self.remote_user == 'root':
               metadata = '/etc/ansible/setup'
           else:
               metadata = '~/.ansible/setup'
       # first copy the source template over
       tpath = tmp## 随机路径 比如:~/.ansible/xxx_temp_1234/
       tempname = os.path.split(source)[-1]  #源文件 比如 nginx.conf.j2
       temppath = tpath + tempname  #组合后 为：~/.ansible/xxx_temp_1234/nginx.conf.j2
       self._transfer_file(conn, utils.path_dwim(self.basedir, source), temppath)
       # install the template module
       template_module = self._transfer_module(conn, tmp, 'template')
       # run the template module
       #先执行 template_module  
       args = [ "src=%s" % temppath, "dest=%s" % dest, "metadata=%s" % metadata ]
       (result1, executed) = self._execute_module(conn, tmp, template_module, args)
       results1 = self._return_from_module(conn, host, result1, executed)
       (host, ok, data) = results1
       ###如果 template module 执行正常，再调用file，模块修改相关权限
       # magically chain into the file module
       if ok:
           # unless failed, run the file module to adjust file aspects
           old_changed = data.get('changed', False)
           module = self._transfer_module(conn, tmp, 'file')
           args = [ "%s=%s" % (k,v) for (k,v) in options.items() ]
           (result2, executed2) = self._execute_module(conn, tmp, module, args)
           results2 = self._return_from_module(conn, host, result2, executed)
           (host, ok, data2) = results2
           new_changed = data2.get('changed', False)
           data.update(data2)
           if old_changed or new_changed:
               data['changed'] = True
           return (host, ok, data)
       else:
           # copy failed, return orig result without going through 'file' module
           return results1