Ansible - 按最后一个参数（IP 地址）对命令列表进行排序答案

【问题标题】：Ansible - Sort a list of commands by the last argument, an IP addressAnsible - 按最后一个参数（IP 地址）对命令列表进行排序
【发布时间】：2018-02-22 01:45:31
【问题描述】：

我有一个要发送到瞻博网络路由器的命令列表。如何按命令末尾的 ip 地址对列表进行排序？

由此，用 set_fact 和 with_items 生成

"command_list": [
    "show bgp neighbor 1.1.1.1",
    "show bgp neighbor 2.2.2.2",
    "show bgp neighbor 3.3.3.3",
    "show route receive-protocol bgp 1.1.1.1",
    "show route receive-protocol bgp 2.2.2.2",
    "show route receive-protocol bgp 3.3.3.3",
    "show route advertising-protocol bgp 1.1.1.1",
    "show route advertising-protocol bgp 2.2.2.2"
    "show route advertising-protocol bgp 3.3.3.3"
]

到这里，按目标IP排序。

"command_list": [
    "show bgp neighbor 1.1.1.1",
    "show route receive-protocol bgp 1.1.1.1",
    "show route advertising-protocol bgp 1.1.1.1",
    "show bgp neighbor 2.2.2.2",
    "show route receive-protocol bgp 2.2.2.2",
    "show route advertising-protocol bgp 2.2.2.2"
    "show bgp neighbor 3.3.3.3",   
    "show route receive-protocol bgp 3.3.3.3",        
    "show route advertising-protocol bgp 3.3.3.3"
]

【问题讨论】：

标签： python ansible jinja2

【解决方案1】：

对list 使用sorted 操作，并利用其key 参数指定在进行比较之前对每个列表元素调用的函数。

command_list = [
    "show bgp neighbor 1.1.1.1",
    "show bgp neighbor 2.2.2.2",
    "show bgp neighbor 3.3.3.3",
    "show route receive-protocol bgp 1.1.1.1",
    "show route receive-protocol bgp 2.2.2.2",
    "show route receive-protocol bgp 3.3.3.3",
    "show route advertising-protocol bgp 1.1.1.1",
    "show route advertising-protocol bgp 2.2.2.2",
    "show route advertising-protocol bgp 3.3.3.3"
]
def last(a):
    for i in reversed(a.split()):
        return i
print(sorted(command_list, key=last))

输出：

 ['show bgp neighbor 1.1.1.1',
 'show route receive-protocol bgp 1.1.1.1',
 'show route advertising-protocol bgp 1.1.1.1',
 'show bgp neighbor 2.2.2.2', 
 'show route receive-protocol bgp 2.2.2.2', 
 'show route advertising-protocol bgp 2.2.2.2',
 'show bgp neighbor 3.3.3.3',
 'show route receive-protocol bgp 3.3.3.3',
 'show route advertising-protocol bgp 3.3.3.3']

【讨论】：

如何在剧本中使用它？
请参考stackoverflow.com/questions/35139711/…。如果仍然没有回答您的问题，最好作为新的 SO 问题提出。
我应该更具体一点：如何将排序列表从 python 传输回 Ansible？ Register 没有从脚本中捕获标准输出，所以我能想到的唯一解决方案是让脚本将排序列表写入文件，然后让 Ansible 重新导入列表。