nagios分布式监控配置

因为我方与某运营商有合做关系他们出机器，但机器是归咱们管理，因为配置主动监控进不了他们机器，因此有这个被动监控需求。在无聊的值班日把nagios分布式监控给搞定了，也算是一种收获吧，很喜欢街上空荡荡的感受，但却不得不为本身的温饱问题感到担心...
进入主题
1、在分布式机器上安装和nagios主监控机同样配置好，在界面上呈现出相关监控信息后

2、开始安装NSCA模块
下载地址
http://nchc.dl.sourceforge.net/sourceforge/nagios/nsca-2.7.2.tar.gz
安装步骤
./configure && make all
这样就安装完毕了，下面是客户端相关配置
cd nsca-2.7.2
1）拷贝相关文件至nagios目录下，注意权限问题
cp sample-config/send_nsca.cfg /usr/local/nagios/etc/
cp src/send_nsca /usr/local/nagios/bin/

2） /usr/local/nagios/etc/send_nsca.cfg文件的password选项与主监控机的一致
password=xxx
3）nagios.cfg配置该配置文件中不加入send_nsca.cfg
nagios_user=nagios
nagios_group=nagios
#上面根据实际状况更改
ocsp_command=submit_check_result
use_syslog=0#这个写入message刷信息我以为烦把他禁了
enable_notifications=0 #把分布式机器上的nagios通知功能禁用
obsess_over_services=1 #设置为obsess
4）/usr/local/nagios/etc/commands.cfg配置文件与原来监控机配置一致的基础上添加
define command{
command_name submit_check_result
command_line /usr/local/nagios/libexec/submit_check_result $HOSTNAME$ '$SERVICEDESC$' $SERVICESTATE$ '$SERVICEOUTPUT$'
}

5）/usr/local/nagios/libexec/submit_check_result脚本内容
#!/bin/sh

# Arguments:
# $1 = host_name (Short name of host that the service is
# associated with)
# $2 = svc_description (Description of the service)
# $3 = state_string (A string representing the status of
# the given service - "OK", "WARNING", "CRITICAL"
# or "UNKNOWN")
# $4 = plugin_output (A text string that should be used
# as the plugin output for the service checks)
#

# Convert the state string to the corresponding return code
return_code=-1

case "$3" in
OK)
return_code=0
;;
WARNING)
return_code=1
;;
CRITICAL)
return_code=2
;;
UNKNOWN)
return_code=-1
;;
esac
# pipe the service check info into the send_nsca program, which
# in turn transmits the data to the nsca daemon on the central
# monitoring server

/usr/bin/printf "%s\t%s\t%s\t%s\n" "$1" "$2" "$return_code" "$4" | /usr/local/nagios/bin/send_nsca central_server -c /usr/local/nagios/etc/send_nsca.cfg

#########################################
#注意脚本中的central_server为主监控机的IP
#########################################
6）若保留该词，则需更改/etc/hosts文件
xx.xx.xx.xx central_server
当客户端正常工做你能够看到进程会不断变化
[root@TJSJHL241-189 nsca-2.7.2]# ps -ef|grep nsca
nagios   31772 31770 0 11:37 ?        00:00:00 /usr/local/nagios/bin/send_nsca central_server -c /usr/local/nagios/etc/send_nsca.cfg
root     31774 17037 0 11:37 pts/0    00:00:00 grep nsca
[root@TJSJHL241-189 nsca-2.7.2]# ps -ef|grep nsca
nagios   31786 31784 0 11:37 ?        00:00:00 /usr/local/nagios/bin/send_nsca central_server -c /usr/local/nagios/etc/send_nsca.cfg
root     31788 17037 0 11:37 pts/0    00:00:00 grep nsca
[root@TJSJHL241-189 nsca-2.7.2]# ps -ef|grep nsca
nagios   31792 31790 0 11:37 ?        00:00:00 /usr/local/nagios/bin/send_nsca central_server -c /usr/local/nagios/etc/send_nsca.cfg
root     31794 17037 0 11:37 pts/0    00:00:00 grep nsca

本身也能够作个test文件测试客户端到服务端的连通性好比test文件内容为
"rrw-2-1" TestMessage 0 This is a test message.
[root@TJSJHL241-189 etc]# /usr/local/nagios/bin/send_nsca central_server -c /usr/local/nagios/etc/send_nsca.cfg < test
0 data packet(s) sent to host successfully.
只要看到sent to host successfully就能够了
当时一直很苦恼为何个人成功了但发的倒是0，最后我就先不考虑这问题先去配置下了，后来发现，主监控与分布式监控的内容是一致的，嘿嘿，若有人知道的话不妨不说，在此谢过了

7）下面观察下services.cfg的配置
define service{
        hostgroup_name                  rrw-game,rrw-res
        service_description             CPU
        check_command                   check_nrpe_cpu
        contact_groups                   yunwei
        check_period                    24x7
        max_check_attempts              4
        normal_check_interval           10
        retry_check_interval            60
        notifications_enabled           1
        notification_options            u,c,r
        check_freshness                 1
        freshness_threshold             20
        }
这是分布式上的多出的两选项
        check_freshness                 1
        freshness_threshold             20#此处为正常检测间隔的2x

能够观察下nagios.cfg
check_freshness 1 此选项黑认是为1的

分布式机器差很少了，启动nagios便可

3、主监控机配置
下载nsca模块
1）安装如上相同
make all 以后
cp sample-config/nsca.cfg /usr/local/nagios/etc/
cp src/nsca /usr/local/nagios/bin/

vi /usr/local/nagios/etc/nsca.cfg更改下面配置
nsca_user=nagios
nsca_group=nagios
password=xxx
此处我就不交由xinetd啥的管理了，自已直接运行
/usr/local/nagios/bin/nsca -d -c /usr/local/nagios/etc/nsca.cfg
2）rc.local添加开机自启动
/usr/local/nagios/bin/nsca -d -c /usr/local/nagios/etc/nsca.cfg
3）services添加
nsca            5667/tcp                        # NSCA
4）iptables开放5667端口
iptables -I RH-Firewall-1-INPUT -p tcp -m tcp --dport 5667 -j ACCEPT
service iptables save
5）新建一个目录放置分布式机器的相关配置文件hosts.cfg hostgroups.cfg与分布式机器配置一致
services.cfg先拷贝分布式机器的配置文件，完成后的配置参考以下
define service{
        hostgroup_name                  rrw-game,rrw-res
        service_description             CPU
        check_command                   check_nrpe_cpu
        contact_groups                  yunwei
        check_period                    24x7
        max_check_attempts              4
        normal_check_interval           10
        retry_check_interval            60
        notifications_enabled           1
        notification_options            u,c,r
        active_checks_enabled           0
        check_freshness                 0#注意此处若是为1，主监控会主动刷新吧，不等分布式机器递交信息过来就会刷新设置为1时会等分布式机器递交结果过来再刷新
        freshness_threshold             20
        passive_checks_enabled          1 # We want only passive checking
        flap_detection_enabled          0
        is_volatile                     0
        }

6）启动相关服务nsca nagios
/usr/local/nagios/bin/nsca -d -c /usr/local/nagios/etc/nsca.cfg
/usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg

4、主监控与分布式机器
主监控与分布式机器添加新监控点时两个监控机器都得同时添加

说明，参照文档时有提把下面添加到commands.cfg文件，同时在服务里调用些命令，目前我这边却是像没有使用到，不知道运行一段时间会不会出问题，有待观察，嘿嘿，看这块有没有必要须要，具体请参照下面的文档吧
define command{
command_name check_dummy
command_line $USER1$/check_dummy $ARG1$
}

参考文档：
nsca模块里的README
http://nagios.sourceforge.net/download/contrib/documentation/misc/NSCA_Setup.pdf
http://www.packtpub.com/article/passive-checks-nsca-nagios-service-check-acceptor