编写Ansible模块并自定义Facts例子

下面来看一个编写Ansible模块并自定义Facts例子,希望例子能帮助到各位.

背景介绍:Ansible自带的Facts有很多,但很多时候并不够用,比如,Ansible就没有ansible_private_ipv4_address这样一个Facts,用来保存私网IP地址.

而我们恰恰就需要这样的一个Facts,因为我们有很多服务器的默认网卡并非是eth0，有的是bond0,eth1,em0,em1等,而公网IP地址与私网IP地址也并没有固定的绑定在某个网卡上,很多时候还是虚拟网卡.

还好,我们可以通过编写Ansible模块并自定义Facts来实现,具体步骤,代码如下:

1. [root@idc-server2~]#ifconfig
2. eth0Linkencap:EthernetHWaddr1B:2B:3B:4B:5B:6B
3. inetaddr:172.16.1.2Bcast:172.16.1.255Mask:255.255.252.0
4. ...
5. eth1Linkencap:EthernetHWaddr1A:2A:3A:4A:5A:6A
6. inetaddr:100.100.100.100Bcast:100.100.100.255Mask:255.255.255.240
7. ...
8. loLinkencap:LocalLoopback
9. inetaddr:127.0.0.1Mask:255.0.0.0
10. ...
11. [root@idc-server1ansible]#vimmyfacts.yml
12. ---
13. -hosts:idc-server2
14. roles:
15. -myfacts
16. [root@idc-server1ansible]#mkdir-proles/myfacts/{tasks,templates}
17. [root@idc-server1ansible]#vimroles/myfacts/tasks/main.yml
18. ---
19. -name:runmyfactsmoduletogetcustomizedfacts
20. myfacts:get_facts=yes
21. -name:updatefilewiththecustomizedfacts
22. template:src=myfacts.txt.j2dest=/tmp/myfacts.txt
23. [root@idc-server1ansible]#vimroles/myfacts/templates/myfacts.txt.j2
24. ansible_private_ipv4_address:{{ansible_private_ipv4_address}}
25. [root@idc-server1ansible]#mkdir/usr/share/ansible/heylinux
26. [root@idc-server1ansible]#vim/usr/share/ansible/heylinux/myfacts
27. #!/usr/bin/python
28. importsys
29. importjson
30. importshlex
31. importcommands
32. importre
33. defget_ansible_private_ipv4_address():
34. iprex="(^192.168)|(^10.)|(^172.1[6-9])|(^172.2[0-9])|(^172.3[0-1])"
35. output=commands.getoutput("""/sbin/ifconfig|grep"Linkencap"|awk'{print$1}'|grep-wv'lo'""")
36. nics=output.split('n')
37. t_nic_info=""
38. foriinnics:
39. ipaddr=commands.getoutput("""/sbin/ifconfig%s|grep-w"inetaddr"|cut-d:-f2|awk'{print$1}'"""%(i))
40. ifre.match(iprex,ipaddr):
41. ansible_private_ipv4_address=ipaddr
42. returnansible_private_ipv4_address
44. args_file=sys.argv[1]
45. args_data=file(args_file).read()
46. arguments=shlex.split(args_data)
47. forarginarguments:
48. if"="inarg:
49. (key,value)=arg.split("=")
50. ifkey=="get_facts"andvalue=="yes":
51. ansible_private_ipv4_address=get_ansible_private_ipv4_address()
53. printjson.dumps({
54. "changed":False,
55. "ansible_facts":{
56. "ansible_private_ipv4_address":ansible_private_ipv4_address
57. }
58. })
59. sys.exit(0)
60. printjson.dumps({
61. "changed":False
62. })
63. [root@idc-server1ansible]#ansible-playbook-urootmyfacts.yml-ihosts
64. PLAY[idc1-server2]***************************************************************
65. GATHERINGFACTS***************************************************************
66. ok:[idc1-server2]
67. TASK:[myfacts|runmyfactsmoduletogetcustomizedfacts]**************
68. ok:[idc1-server2]
69. TASK:[myfacts|updatefilewiththecustomizedfacts]*********************
70. changed:[idc1-server2]
71. PLAYRECAP********************************************************************
72. idc1-server2:ok=3changed=1unreachable=0failed=0--phpfensi.com
73. [root@idc-server1ansible]#sshidc1-server2'cat/tmp/myfacts.txt'
74. ansible_private_ipv4_address:172.16.1.2