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HomeDatabaseMysql TutorialSaltstack 新特性测试之proxy minion

Saltstack 新特性测试之proxy minion

Jun 07, 2016 pm 04:37 PM
miniproxysaltstacknew featurescharacteristic

salt 目前主要的应用场景是Linux OS下,另外还有Windows Client(Win下没用过,但是看官方issue,应该……),最近关注到官方的一个小模块提到了Proxy minion,群里也多有提及,便想着看看到底是啥存在。 任何设备均可被salt托管 salt proxy minion的出现,

salt 目前主要的应用场景是Linux OS下,另外还有Windows Client(Win下没用过,但是看官方issue,应该……),最近关注到官方的一个小模块提到了Proxy minion,群里也多有提及,便想着看看到底是啥存在。

任何设备均可被salt托管

salt proxy minion的出现,使得网管设备或者哑设备(比如sms gateway)均可被salt统一管理,而实际的管理模块或通讯接口均由用户自行编写好,具体操作内容请参见salt 官网对应的 Proxy Minion 介绍

开发中的新特性

首先需要注意一点,Proxy minion是2014.1.x版本引进的新特性,并且到目前为止仍处于开发阶段,仅可用作测试用途。

测试环境的准备

本人的PC环境:

  • vbox下ubuntu 14.04 LTS Server
  • Salt master & minion 2014.1.7(配置test.ping通,不多说了)

准备好基础环境之后,需要从github下载salt官方开发人员用于测试Proxy Minion的一个小程序(Rest Server,模拟网管设备的管理接口),名字是 salt-proxy-rest。

这个程序可能依赖两个python库,bottle和requests(其实就是web server需要的组件……),安装一下即可。

使用 python rest.py 运行该程序,可以将此作为一个网管设备的Web管理接口:

alt

尝试运行!

至此,准备工作算是完成。在当前环境下,salt-master和salt-minion稳定运行,并且有一个提供REST接口的网管设备在独立工作,我们需要做的便是将其拉进Salt的阵营。

配置pillar

鄙人的minion id是docker,对应的pillar的top.sls内容配置为:

root@docker:/srv/pillar# cat top.sls
base:
  docker:
    - proxyminion

而proxyminion.sls内容则是对应网管设备的描述:

root@docker:/srv/pillar# cat proxyminion.sls 
proxy:
  rest_sample:
    proxytype: rest_sample
    url: http://127.0.0.1:8080/
    id: proxy_docker

这里需要注意的是,proxytype必须是在salt/proxy下已经预先定义好的,而其他的一些参数则是自己网管设备通信需要的一些数据,不一定相同。

定义好pillar数据之后,需要为之添加对应的proxy conn class和grains数据,这里鄙人使用官方sample,就偷个懒:

root@docker:/srv/pillar# cat /usr/lib/python2.7/dist-packages/salt/proxy/rest_sample.py
# -*- coding: utf-8 -*-
'''
This is a simple proxy-minion designed to connect to and communicate with
the bottle-based web service contained in salt/tests/rest.py.
Note this example needs the 'requests' library.
Requests is not a hard dependency for Salt
'''
……

放心,2014.1.7版本已经默认有这个sample代码。 接下来,直接test.ping试试吧!

root@docker:/srv/pillar# salt '*' test.ping -v
Executing job with jid 20140720110315049478
-------------------------------------------
docker:
    True
rest_sample-localhost:
    True

诶,等一下,为什么多出来个key?为什么还能test.ping通?没错!这个就是ProxyMinion,而salt默认已经配置了test.ping方法兼容proxy minion了,只要写好对应的ping模块,就可以使用常规的test.ping来探测!(本例的ping代码如下)

def ping(self):
    '''
    Is the REST server up?
    '''
    r = requests.get(self.url+'ping')
    try:
        if r.status_code == 200:
            return True
        else:
            return False
    except Exception:
        return False

rest_sample还提供很多function,比如鄙人测试的一个service_status,修改对应的模块代码即可使之兼容proxy minion(代码路径为/usr/lib/python2.7/dist-packages/salt/modules/service.py):

def status(name, sig=None):
    '''
    Return the status for a service, 
    returns the PID or an empty string if the
    service is running or not, pass a signature
    to use to find the service via ps
    CLI Example:
    .. code-block:: bash
    salt '*' service.status  [service signature]
    '''
    #wjx add, denote it to work!!
    #if 'proxyobject' in __opts__:
    #    return __opts['proxyobject'].service_status(sig if sig else name)
    return __salt__['status.pid'](sig if sig else name)

那么这时候再看看当前proxy minion管理的服务状态咋样了:

root@docker:/srv/pillar# salt '*' service.status apache
rest_sample-localhost:
    ----------
    comment:
        stopped
    ret:
        True
docker:
    False

完全和普通minion兼容!!rest_sample本身还配置了grain数据,代码位于/usr/lib/python2.7/dist-packages/salt/grains/rest_sample.py,直接敲命令看看:

root@docker:/srv/pillar# salt 'rest_sample-localhost' grains.items
rest_sample-localhost:
    housecat: Are you kidding?
    kernel: 0.0000001
    location: In this darn virtual machine.  Let me out!
    os: RestExampleOS
    os_family: proxy

Awesome!!这样一来,一个基本的salt proxy minion就算是配置完成,Proxy Minion 的类定义代码位于/usr/lib/python2.7/dist-packages/salt/minion.py,有兴趣可以看看。

可能的bug

鄙人在本机测试时,Minion Docker在尝试fork出一个ProxyMinion过程中间报错,说_running参数没有配置,在添加代码后通过(即位于minion.py代码里)

class ProxyMinion(Minion):
'''
This class instantiates a 'proxy' minion--a minion that does not manipulate
the host it runs on, but instead manipulates a device that cannot run a minion.
'''
def __init__(self, opts, timeout=60, safe=True):  # pylint: disable=W0231
    '''
    Pass in the options dict
    '''
    #wjx add, maybe a bug
    self._running = None
    # Warn if ZMQ 
<h4 id="聊聊Proxy-Minion">聊聊Proxy Minion</h4>
<p>Proxy minion使得salt针对网管设备的配置管理成为可能,不过想要实现一个ProxyType的ProxyMinion的完全管理,可能需要编写很多额外的module去支持它的运行。</p>
<p>在大公司复杂的网络环境下,完全可以针对此编写对应SNMP管理模块或者针对OVS编写对应的管理模块,尔后通过salt统一托管,毕竟Salt有一套完善的配置管理体系啊!</p>
    <p class="copyright">
        原文地址:Saltstack 新特性测试之proxy minion, 感谢原作者分享。
    </p>
    
    


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