遇到问题:nginx日志包含非常重要的信息。比如upstream_response_time 和request_time。现需求监控改值。
解决问题:编写python脚本,通过nagios check_nrpe 插件完成监控。
前提了解: nginx日志格式:
log_format main '$remote_addr |$time_local| $request | $status | $body_byte s_sent | $http_referer | $http_user_agent | $upstream_response_time | $request_t ime | $upstream_addr';
日志范例:
10.113.205.117 |13/Sep/2016:21:24:07 +0800| POST /test/test HTTP/1.0 | 200 | 223 | - | Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727) | 0.034 | 0.042 | 10.156.168.193:8001
通过观察nginx日志范例,于是有了监控脚本的思路。 监控日志的最后输出一行,将倒数第二列和倒数第三列拎出来做值的比较大小。值大于10s,则表示该站点响应较慢,应及时报警。 nagios会对脚本执行返回的状态码有一个反馈。返回0,nagios 显示ok;返回2,nagios显示critial,并触发报警。
nagios客户端操作:
nagios客户端添加脚本,python脚本如下:
#!/usr/bin/python # -*- coding:UTF-8 -*-
import subprocess import os import sys
api = ("tail -n 1 /mnt/log/nginx/test.test.cn.log")
def testtime(): child= subprocess.Popen(api,shell=True,stdout=subprocess.PIPE) line = child.stdout.readline() upstream_response_time = float(line.split("|")[-3].strip()) request_time = float(line.split("|")[-2].strip()) line = line.replace('|','')
if upstream_response_time < 10 or request_time < 10 : print "OK - api.test.cn request time ok" sys.exit(0) else: print "CRITIAL- api.test.cn %s %s " % (upstream_response_time ,request_time),"Link is: ",line, sys.exit(2)
if __name__ == '__main__': testtime()
将该脚本添加到 插件目录下,并给执行权限。
[iyunv@nginx101 mcSitesConf]# ll /usr/local/nagios/libexec/check_requestime_test.py -rwxr-xr-x 1 root root 716 Sep 13 14:03 /usr/local/nagios/libexec/check_requestime_test.py [iyunv@nginx101 mcSitesConf]#
nrpe 配置文件添加监控命令:
command[check_requestime_test]=/usr/local/nagios/libexec/check_requestime_test.py
添加完成,重启客户端的nrpe
ps aux | grep nrpe
杀死进程id
启动如下:
/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d
至此,nagios客户端添加完成。可在服务端验证是否成功
nagios服务端操作:
[iyunv@monitor101 ~]# /usr/lib64/nagios/plugins/check_nrpe -H 10.134.6.129 -c check_requestime_test OK - api.test.cn request time ok
验证成功,开始添加监控服务文件
/etc/nagios/conf.d/services/nginx101.cfg 添加以下内容 define service{ hostgroup_name nginx.linux service_description check_requestime_test status use system-level-service check_command check_nrpe!check_requestime_test }
检查nagios配置文件是否正确,并重启nagios
service nagios checkconfig service nagios reload
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