Ganglia Python插件编写过程笔记

一、Gmond扩展Python度量模块官方：官方文档中文版：

查找本地gmond是否安装# netstat -ano | grep 8649或者# talnet localhost 8649

查找gmond动态链接库文件路径# locate */ganglia/*.so/opt/ganglia/lib/python/gmon/Gmetricmodule.so/opt/ganglia/lib/python/gmon/Networkmodule.so/opt/ganglia/lib/python/gmon/Processmodule.so/usr/local/lib64/ganglia/modcpu.so/usr/local/lib64/ganglia/moddisk.so/usr/local/lib64/ganglia/modload.so/usr/local/lib64/ganglia/modmem.so/usr/local/lib64/ganglia/modmulticpu.so/usr/local/lib64/ganglia/modnet.so/usr/local/lib64/ganglia/modproc.so/usr/local/lib64/ganglia/modpython.so/usr/local/lib64/ganglia/modsys.so# cd /usr/local/lib64/ganglia/modcpu.so moddisk.so modload.so modmem.so modmulticpu.so modnet.so modproc.so modsys.so

安装 ganglia-python-3.3.0-1.x86_64.rpm# rpm -ivh ganglia-python-3.3.0-1.x86_64.rpm# cd /usr/local/lib64/ganglia/# lsmodcpu.so moddisk.so modload.so modmem.so modmulticpu.so modnet.so modproc.so modpython.so modsys.so python_modulesmodpython.so 和 python_modules目录在安装ganglia-python后产生扩展Python度量模块完成

二、开发python模块查找python模块配置文件存放路径# vim /etc/ganglia/gmond.conf/include 搜索，，一般会有如下格式的一行，该目录即为存放路径，如没有这行，手动添加一行include (“/usr/local/etc/conf.d/*.conf”)创建配置文件foo.conf，让gmond知道这里有ganglia插件# cd /usr/local/etc/conf.d# vim foo.conf粘贴下面的配置代码modules { module { name = “foo” #模块名，该文件存放于params = “/usr/lib64/ganglia/python_modules”指定的路径下 language = “python” #声明使用python语言 params = “/usr/local/lib64/ganglia/python_modules” #指定编写的python脚本放置位置，可不写用默认 }}

collection_group { collect_every = 60 time_threshold = 60 metric { name = “foo_count” #python主模块名称 title = “Foo Count” #动态库路径 value_threshold = 1.0 #编写的python脚本放置位置 }}

编写自定义Python模块# cd /usr/local/lib64/ganglia/python_modules# vim foo.py

粘贴以下代码：

#coding=utf-8import randomdef get_foo_count(name): ”’可定制业务方法，返回一个整数值”’ return random.randrange(5, 100) + 10

def metric_init(params): ”’metric”’ global descriptors d1 = { ‘name’: ‘foo_count’, ‘call_back’: get_foo_count, # 名字同业务方法一致 ‘time_max’: 90, # 最大调度间隔时间 ‘value_type’: ‘uint’, ‘units’: ‘C’, ‘slope’: ‘both’, ‘format’: ‘%u’, ‘description’: ‘Number of Foo’, ‘groups’: ‘foo_group’ } descriptors = [d1] return descriptors

def metric_cleanup(): “清除metric”

if __name__ == ‘__main__’: metric_init({}) for d in descriptors: v = d[‘call_back’](d[‘name’]) print ‘value for %s is %u’ % (d[‘name’], v)

三、重启gmond

# /etc/init.d/gmond restart

等待故人的归来。山上的树，大多数是松树比较突出。