使用python监控memcached基本信息

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使用python监控memcached基本信息
　　


使用python监控memcached的基本信息，例如：connections、hitRate、freeMemory、memoryUsage、evictions等等。然后自定义zabbix keys值实现自定义监控模版！

首先安装需要的环境：

pip install python-memcached
话不多说，直接上脚本：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
__author__ = 'chenmingle'
import sys
import subprocess
import json
try:
import memcache
except Exception, e:
print 'pip install python-memcached'
sys.exit(1)
class Memcached(object):
def __init__(self, host_list):
self.mc = memcache.Client(host_list)
try:
self.stats = self.mc.get_stats()[0][1]
except Exception, e:
pass
def get_curr_connections(self):
"""
Get current connections for Memcached
UserParameter: connections
"""
try:
return int(self.stats['curr_connections'])
except Exception, e:
return 0
def get_cache_hit_rate(self):
"""
Get the hit rate for Memcached
UserParameter: hitRate
"""
try:
rate = float(self.stats['get_hits']) / float(self.stats['cmd_get'])
return "%.2f" % (rate * 100)
except Exception, e:
return 0.0
def get_free_memory(self):
"""
Get the free memory in Memcached Byte
UserParameter: freeMemory
"""
try:
free = int(self.stats['limit_maxbytes']) - int(self.stats['bytes'])
return free
except Exception, e:
return 0
def get_memory_usage_rate(self):
"""
Get the memory usage rate in Memcached
UserParameter: memoryRate
"""
try:
rate = float(self.stats['bytes']) / float(self.stats['limit_maxbytes'])
return "%.2f" % (rate * 100)
except Exception, e:
return 0.0
def get_evictions(self):
"""
Get evictd items in Memcached one minute avg
UserParameter: evictions
"""
try:
# minutes = int(self.stats['uptime']) / 60
# return int(self.stats['evictions']) / int(minutes)
return int(self.stats['evictions'])
except Exception, e:
return 0
def test(self):
# print json.dumps(self.stats, indent=4)
print 'connections: %s' % self.get_curr_connections()
print 'hitRate: %s %%' % self.get_cache_hit_rate()
print 'freeMemory: %s Byte' % self.get_free_memory()
print 'memoryUsage: %s %%' % self.get_memory_usage_rate()
print 'evictions: %s' % self.get_evictions()
print 'alive: %s' % check_alive(host_list)
def check_alive(host_list):
host = host_list.split(':')[0]
port = host_list.split(':')[1]
cmd = 'nc -z %s %s > /dev/null 2>&1' % (host, port)
return subprocess.call(cmd, shell=True)
def parse(type, host_list):
mc = Memcached([host_list])
if type == 'connections':
print mc.get_curr_connections()
elif type == 'hitRate':
print mc.get_cache_hit_rate()
elif type == 'freeMemory':
print mc.get_free_memory()
elif type == 'memoryUsage':
print mc.get_memory_usage_rate()
elif type == 'evictions':
print mc.get_evictions()
elif type == 'alive':
print check_alive(host_list)
else:
mc.test()
if __name__ == '__main__':
try:
host_list = sys.argv[1]
type = sys.argv[2]
except Exception, e:
print "Usage: python %s 127.0.0.1:11211 connections" % sys.argv[0]
sys.exit(1)
parse(type, host_list)
例行测试一下脚本的效果：

[root@Memcached zabbix_agentd.d]# /usr/local/bin/python /home/python/check_memcached.py 10.0.0.90:11211 test
connections: 1593
hitRate: 98.15 %
freeMemory: 849551027 Byte
memoryUsage: 80.22 %
evictions: 7477932
alive: 0
现在已经完成一个简单的监控memcached基本信息的脚本了，接下来为了以后方便查看做个自定义监控项加入到zabbix上去。

• 首先定义监控项配置：
  

cd /etc/zabbix/zabbix_agentd.d
cat Memcached.conf
# Memcached
UserParameter=memcached.stats

,/usr/local/bin/python /home/python/check_memcached.py 10.0.0.90:11211 $1

• 在zabbix上配置自定义模版自定义监控项：
  

这样就完成一个简单的监控memcached的自定义模版，如果觉得这文章不错的，请在本人Github上点个star，感谢！！