通过Jinja2模板对IP进行排序

Question

我有问题通过Jinja2和Ansible排序IP.这是我的变量和ansible模板的jinja2代码.

角色/ DNS /瓦尔/ main.yml:

---
DC1:
   srv1:
     ip: 10.2.110.3
   srv2:
     ip: 10.2.110.11
   srv3:
     ip: 10.2.110.19
   srv4:
     ip: 10.2.110.24

DC2:
   srv5:
     ip: 172.26.158.3
   srv6:
     ip: 172.26.158.11
   srv7:
     ip: 172.26.158.19
   srv8:
     ip: 172.26.158.24

角色/ DNS /模板/ db.example.com.j2:

$TTL 86400
@       IN SOA                  example.com. root.example.com. (
                                2014051001  ; serial
                                      3600  ; refresh
                                      1800  ; retry
                                    604800  ; expire
                                     86400  ; minimum
)

; Name server
                       IN      NS      dns01.example.com.

; Name server A record
dns01.example.com.        IN      A       10.2.110.92


; 10.2.110.0/24 A records in this Domain
{% for hostname, dnsattr in DC1.iteritems() %}
{{hostname}}.example.com.   IN      A       {{dnsattr.ip}}


; 172.26.158.0/24 A records in this Domain
{% for hostname, dnsattr in DC2.iteritems() %}
{{hostname}}.example.com.   IN      A       {{dnsattr.ip}}

角色/ DNS /任务/ main.yml:

- name: Update DNS zone file db.example.com 
  template: 
    src: db.example.com.j2
    dest: "/tmp/db.example.com"
  with_items: "{{DC1,DC2}}"

- name: Restart DNS Server
  service:
    name: named
    state: restarted

DNS区域文件已正确创建,但IP未按数字排序.我试过使用以下但没有运气:

按字母顺序对主机名进行排序

{% for hostname, dnsattr in center.iteritems() | sort %}

找不到属性dnsattr

{% for hostname, dnsattr in center.iteritems() | sort(attribute='dnsattr.ip') %}

找不到属性ip

{% for hostname, dnsattr in center.iteritems() | sort(attribute='ip') %}

Answer 1

要对 IP 进行数字排序，您可以实现并使用您自己的过滤器插件（顺便说一句，我对任何其他解决方案感兴趣）：

在ansible.cfg添加filter_plugins = path/to/filter_plugins.

在path/to/filter_plugins/ip_filters.py：

#!/usr/bin/python

def ip_sort(ip1, ip2):
    # Sort on the last number 
    return int(ip1.split('.')[-1]) - int(ip2.split('.')[-1])

class FilterModule(object):
    def filters(self):
        return {
            'sort_ip_filter': self.sort_ip_filter,
        }

    def sort_ip_filter(self, ip_list):
        return sorted(ip_list, cmp=ip_sort)

然后，在 Ansible 中：

- name: "Sort ips"
  debug:
    msg: vars='{{ my_ips | sort_ip_filter }}'

我还会使用ipaddr过滤器来确保格式正确：

- name: "Sort ips"
  debug:
    msg: vars='{{ my_ips | ipaddr | sort_ip_filter }}'