实战ganglia分布式的监控系统（2）——集成nagios报告Ganglia指标
本次实验紧接上次实验，ganglia节点需要开启，且已经安装Nagios，Nagios安装可参考我前面关于nagios的博客：实战Nagios网络监控（1）——监控本机运行状态和Mysq主机注:ganglia与nagios可以部署在不同的主机
主机nagios状态如下:
http://s2.运维网.com/wyfs02/M01/89/6A/wKioL1gSp9KAHjdHAAKfKFi_oNU988.png
主机ganglia状态如下:
server1
http://s5.运维网.com/wyfs02/M01/89/6A/wKioL1gSqk7iFdV3AAEd9BZdVhA356.png
server2
http://s3.运维网.com/wyfs02/M00/89/6A/wKioL1gSqnKTTPl0AAERibGH19U241.png
nagios监控远程主机的方式为nagios+nrpe，而ganglia可以使用客户端daemon(Ganglia Monitoring Daemon(gmond))监控远程主机，本次实验为server1上只装有nagios，server1和server2上没有装nrpe服务，服务端server1无法获取server2的主机资源。添加ganglia服务，ganglia集群资源中有server1和server2服务。利用server1上的nagios集成ganglia服务从而让server1上的nagios监控远程主机server2上的资源。
1.ganglia配置
# cp /root/ganglia-3.4.0/contrib/check_ganglia.py /usr/local/nagios/libexec/
# cd /usr/local/nagios/libexec/
# chown nagios.nagios check_ganglia.py
注:check_ganglia.py 命令仅在阈值过高时发出警告。如果希望在阈值过低时发出警告(在disk_free 中是这样),则需要修改代码。我更改了文件的最后部分,如下所示:
# vim check_ganglia.py
89 if critical > warning:
90 if value >= critical:
91 print "CHECKGANGLIA CRITICAL: %s is %.2f" % (metric, value)
92 sys.exit(2)
93 elif value >= warning:
94 print "CHECKGANGLIA WARNING: %s is %.2f" % (metric, value)
95 sys.exit(1)
96 else:
97 print "CHECKGANGLIA OK: %s is %.2f" % (metric, value)
98 sys.exit(0)
99 else:
100 if critical > value:
101 print "CHECKGANGLIA CRITICAL: %s is %.2f" % (metric, value)
102 sys.exit(2)
103 elif warning >= value:
104 print "CHECKGANGLIA WARNING: %s is %.2f" % (metric, value)
105 sys.exit(1)
106 else:
107 print "CHECKGANGLIA OK: %s is %.2f" % (metric, value)
108 sys.exit(0)
# /usr/local/nagios/libexec/check_ganglia.py -h server2.example.com -m disk_free -w 20 -c 10
CHECKGANGLIA CRITICAL: disk_free is 6.36
2.nagios配置
# cd /usr/local/nagios/etc/objects/
# vim commands.cfg
添加如下内容：
# 'check_ganglia' command definition
define command {
command_name check_ganglia
command_line $USER1$/check_ganglia.py -h $HOSTNAME$ -m $ARG1$ -w $ARG2$ -c $ARG3$
}
# vim templates.cfg
添加如下内容：
define service {
use generic-service
name ganglia-service
hostgroup_name ganglia-servers
service_groups ganglia-metrics
}
# vim hosts.cfg
添加如下内容：
define host{
use linux-server
host_name server2.example.com
alias server2
address 172.25.254.2
icon_image switch.gif
statusmap_image switch.gd2
2d_coords 400,100
3d_coords 400,200,100
}
define hostgroup {
hostgroup_name ganglia-servers
alias ganglia-servers
members server2.example.com
}
# vim services.cfg
添加如下内容：
define servicegroup {
servicegroup_name ganglia-metrics
alias Ganglia Metrics
}
define service{
use ganglia-service
service_description 根分区
check_command check_ganglia!disk_free_percent_rootfs!20!10
}
define service{
use ganglia-service
service_description 系统负载
check_command check_ganglia!load_one!4!5
}
define service{
use ganglia-service
service_description 内存空闲
check_command check_ganglia!mem_free!50000!30000
}
# /etc/init.d/nagios restart
浏览器端刷新查看，servre2端的资源被监控：
http://s3.运维网.com/wyfs02/M00/89/6D/wKiom1gSrNmx9bM-AAHWREVYg-g491.png
等一段时间，状态都变成了OK：
http://s5.运维网.com/wyfs02/M01/89/6B/wKioL1gSrZSRqigmAAGxd3yq6O4346.png
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