1일차

[student@workstation ~]$ ansible-doc ping

> PING    (/usr/lib/python2.7/site-packages/ansible/modules/system/ping.py)

  A trivial test module, this module always returns `pong' on successful contact. It does not make sense in playbooks, but it is useful from `/usr/bin/ansible' to

  verify the ability to login and that a usable python is configured. This is NOT ICMP ping, this is just a trivial test module.

EXAMPLES:

# Test we can logon to 'webservers' and execute python with json lib.

ansible webservers -m ping

MAINTAINERS: Ansible Core Team, Michael DeHaan

METADATA:

        Status: ['stableinterface']

        Supported_by: core

[student@workstation ~]$

• 사전조건
  • ~/dep-lab/ansible.cfg

    • [student@workstation dep-lab]$ cat ansible.cfg

      [defaults]

      inventory = inventory

      remote_user = devops

      ask_pass = false

      
      

      [privilege_escalation]

      become=false

      become_method=sudo

      become_user=root

      become_ask_pass=false

  • ~/dep-lab/inventory/inventory

    • [student@workstation dep-lab]$ cat inventory/inventory
      [intranetweb]
      servera.lab.example.com
      serverc.lab.example.com
      serverd.lab.example.com
      
      [internetweb]
      
      [everyone:children]
      intranetweb
      internetweb

  • ~/dep-lab/inventory/binventory.py

    • [student@workstation dep-lab]$ cat inventory/binventory.py

      #!/usr/bin/env python

      
      

      from subprocess import Popen,PIPE

      import sys

      import json

      
      

      result = {}

      result['internetweb'] = {}

      result['internetweb']['hosts'] = []

      result['internetweb']['vars'] = {}

      
      

      pipe = Popen(['getent', 'hosts'], stdout=PIPE, universal_newlines=True)

      
      

      for line in pipe.stdout.readlines():

         s = line.split()

         if s[1].startswith('serverb'):

            result['internetweb']['hosts'].append(s[1])

      
      

      if len(sys.argv) == 2 and sys.argv[1] == '--list':

          print(json.dumps(result))

      elif len(sys.argv) == 3 and sys.argv[1] == '--host':

          print(json.dumps({}))

      else:

          print("Requires an argument, please use --list or --host <host>")

      [student@workstation dep-lab]$

• 동적 인벤토리 설명
  • inventory 디렉터리내의 실행권한이 있는 스크립트를 모두 실행하여 동적 inventory를 구성한다.

  • 아래와 같이 binventory 실행결과가 'serverb.lab.example.com'을 반환하고 있으므로, 정적 'inventory'파일에는 포함되어 있지 않지만, 동적스크립트를 통하여 'serverb' 가 추가 되었다. 

    [student@workstation dep-lab]$ inventory/binventory.py --list
    {"internetweb": {"hosts": ["serverb.lab.example.com"], "vars": {}}}
    [student@workstation dep-lab]$