一个简单的监控redis性能的python脚本

一个简单的监控redis性能的python脚本

上一篇已经讲了如何监控memcached了，现在也顺带讲如何监控redis。

首先介绍下监控redis那些信息：

Redis ping：检验ping

Redis alive：查看检查端口是否alive

Redis connections：查看连接数

Redis blockedClients：正在等待阻塞客户端数量

Redis connectionsUsage：redis的连接使用率

Redis memoryUsage：redis内存使用量

Redis memoryUsageRate：redis内存使用率

Redis evictedKeys：运行以来删除过的key的数量

Redis rejectedConnections：拒绝连接数

Redis ops：redis的OPS

Redis hitRate：redis命中率

安装需要的环境

pip install redis

脚本内容

#!/usr/bin/env python
# -*- coding: utf-8 -*-
__author__ = 'chenmingle'

import sys
import subprocess
import json

try:
import redis
except Exception, e:
print 'pip install redis'
sys.exit(1)

class Redis(object):
def __init__(self, host, port, password=None):
self.host = host
self.port = port
self.password = password
if self.password:
self.rds = redis.StrictRedis(host=host, port=port, password=self.password)
else:
self.rds = redis.StrictRedis(host=host, port=port)
try:
self.info = self.rds.info()
except Exception, e:
self.info = None

def redis_connections(self):
try:
return self.info['connected_clients']
except Exception, e:
return 0

def redis_connections_usage(self):
try:
curr_connections = self.redis_connections()
max_clients = self.parse_config('maxclients')
rate = float(curr_connections) / float(max_clients)
return "%.2f" % (rate * 100)
except Exception, e:
return 0

def redis_used_memory(self):
try:
return self.info['used_memory']
except Exception, e:
return 0

def redis_memory_usage(self):
try:
used_memory = self.info['used_memory']
max_memory = self.info['maxmemory']
system_memory = self.info['total_system_memory']
if max_memory:
rate = float(used_memory) / float(max_memory)
else:
rate = float(used_memory) / float(system_memory)
return "%.2f" % (rate * 100)
except Exception, e:
return 0

def redis_ping(self):
try:
return self.rds.ping()
except Exception, e:
return False

def rejected_connections(self):
try:
return self.info['rejected_connections']
except Exception, e:
return 999

def evicted_keys(self):
try:
return self.info['evicted_keys']
except Exception, e:
return 999

def blocked_clients(self):
try:
return self.info['blocked_clients']
except Exception, e:
return 0

def ops(self):
try:
return self.info['instantaneous_ops_per_sec']
except Exception, e:
return 0

def hitRate(self):
try:
misses = self.info['keyspace_misses']
hits = self.info['keyspace_hits']
rate = float(hits) / float(int(hits) + int(misses))
return "%.2f" % (rate * 100)
except Exception, e:
return 0

def parse_config(self, type):
try:
return self.rds.config_get(type)[type]
except Exception, e:
return None

def test(self):
print 'Redis ping: %s' % self.redis_ping()
print 'Redis alive: %s ' % check_alive(self.host, self.port)
print 'Redis connections: %s' % self.redis_connections()
print 'Redis blockedClients %s' % self.blocked_clients()
print 'Redis connectionsUsage: %s%%' % self.redis_connections_usage()
print 'Redis memoryUsage: %s' % self.redis_used_memory()
print 'Redis memoryUsageRate: %s%%' % self.redis_memory_usage()
print 'Redis evictedKeys: %s' % self.evicted_keys()
print 'Redis rejectedConnections: %s' % self.rejected_connections()
print 'Redis ops: %s' % self.ops()
print 'Redis hitRate: %s%%' % self.hitRate()

def check_alive(host, port):
cmd = 'nc -z %s %s > /dev/null 2>&1' % (host, port)
return subprocess.call(cmd, shell=True)

def parse(type, host, port, password):
rds = Redis(host, port, password)
if type == 'connections':
print rds.redis_connections()
elif type == 'connectionsUsage':
print rds.redis_connections_usage()
elif type == 'blockedClients':
print rds.blocked_clients()
elif type == 'ping':
print rds.redis_ping()
elif type == 'alive':
print check_alive(host, port)
elif type == 'memoryUsage':
print rds.redis_used_memory()
elif type == 'memoryUsageRate':
print rds.redis_memory_usage()
elif type == 'rejectedConnections':
print rds.rejected_connections()
elif type == 'evictedKeys':
print rds.evicted_keys()
elif type == 'hitRate':
print rds.hitRate()
elif type == 'ops':
print rds.ops()
else:
rds.test()

if __name__ == '__main__':
try:
type = sys.argv[1]
host = sys.argv[2]
port = sys.argv[3]
if sys.argv.__len__() >=5:
password = sys.argv[4]
else:
password = None
except Exception, e:
print "Usage: python %s type 127.0.0.1 6379" % sys.argv[0]
sys.exit(1)
parse(type, host, port, password)

测试脚本，查看监控redis信息（假如redis没设置密码，可不填密码执行）：

/bin/python /home/python/check_redis.py test 192.168.4.18 6379 password
Redis ping: True
Redis alive: 0
Redis connections: 447
Redis blockedClients 0
Redis connectionsUsage: 4.47%
Redis memoryUsage: 2885122048
Redis memoryUsageRate: 17.32%
Redis evictedKeys: 0
Redis rejectedConnections: 0
Redis ops: 1050
Redis hitRate: 71.87%

最后加入到zabbix自定义key上

cat /etc/zabbix/zabbix_agentd.d/redis.conf
# Redis
UserParameter=redis.stats[*],/bin/python /home/python/check_redis.py $1 192.168.4.18 6379 password

接下来加入自定义模版的操作可以参考上一篇博客