Nagios监控搭建和配置（笔记）
废话不多说，本博文纯属于个人笔记，可能会出现杂乱无章的感觉，只是把遇到的问题一一的记录下来，方便日后查看，也能帮助遇到类型问题的还在纠结的人。系统版本及信息
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cat /etc/redhat-release
CentOS release 6.2 (Final)
uname -a
Linux2.6.32-220.el6.x86_64x86_64 x86_64 x86_64 GNU/Linux
ifconfig |sed -n 1,2p
eth0 Link encap:EthernetHWaddr 40:F2:E9:29:5F:EA
inet addr:192.168.0.2Bcast:192.168.69.255Mask:255.255.255.0
关闭 Iptablesselinux
软件版本信息
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LAMP/LNMP 忽略，任何一个环境都可以，我这里是yum 安装的LNMP环境
nagios-4.0.5.tar.gz
nagios-plugins-1.4.16.tar.gz
nrpe-2.15.tar.gz
pnp4nagios-0.6.19.tar.gz
安装Nagios软件准备工作
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确保 yum 能正常使用，建议是配置网络 yum ，安装系统所需库文件
yum groupinstall "Compatibility libraries" "Base" "Development tools"
安装lamp及所需包
yum -y install http* php* mysql* perl* net-snmp* openssl* glibc rrdtoolrrdtool-devel rrdtool-perl rrdtool-php
chkconfig mysqld on
chkconfig httpd on
chkconfig snmpd on
service httpdstart
service mysqld start
service snmpd start
测试ok 继续下一步
ps -ef | grep -v grep | grep http mysql snmp #分别查看，web页面访问测试
安装Nagios
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1、创建nagios程序用户、组
# useradd -s /sbin/nologin nagios
# mkdir /usr/local/nagios
# chown -R nagios.nagios /usr/local/nagios/
2、编译安装nagios
# tar zxf nagios-4.0.5.tar.gz
# cd nagios-4.0.5
# ./configure --prefix=/usr/local/nagios
# make all &&make install && make install-init && make install-commandmode&& make install-config && make install-webconf
# echo $?
0
3、加入开机启动
chkconfig --add nagios
chkconfig nagios on
chkconfig--list nagios
安装nagios-plugins 插件
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# tar zxf nagios-plugins-1.4.16.tar.gz
# cd nagios-plugins-1.4.16
# ./configure --prefix=/usr/local/nagios/
# make
# make install
# echo $?
0
编辑http.conf配置文件
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cd /etc/httpd/conf
cp -a httpd.conf httpd.conf.bak
vim httpd.conf # 添加在最后面即可
####### setting for nagios #######
ScriptAlias /nagios/cgi-bin "/usr/local/nagios/sbin"
AuthType Basic
Options ExecCGI
AllowOverride None
Order allow,deny
Allow from all
AuthName "nagios access"
AuthUserFile /usr/local/nagios/etc/htpasswd
Require valid-user
Alias /nagios "/usr/local/nagios/share"
AuthType Basic
Options ExecCGI
AllowOverride None
Order allow,deny
Allow from all
AuthName "nagios access"
AuthUserFile /usr/local/nagios/etc/htpasswd
Require valid-user
修改
DirectoryIndex index.html index.html.var
为
DirectoryIndex index.php index.html index.html.var
修改
Options Indexes FollowSymLinks
为
Options FollowSymLinks #防止网站列目录
service httpd restart
增加nagios登陆认证文件，一定要用默认的nagiosadmin作为用户，否则需要修改其他文件，修改之前备份，这里就不备份了
# cd /usr/local/nagios/etc
# sed -i s@nagiosadmin@nagiosadmin,admin@g cgi.cfg
# sed -i s@#default_user_name=guest@default_user_name=admin@g cgi.cfg
# htpasswd -c /usr/local/nagios/etc/htpasswd admin
New password: ******
Re-type new password:******
安装 Nrpe 插件
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# tar zxf nrpe-2.15.tar.gz
# cd nrpe-2.15
# ./configure;make all;make install-plugin;make install-daemon;make install-daemon-config
启动Nrpe
# /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d
# netstat -antl |grep 5666
tcp 0 0 0.0.0.0:5666 0.0.0.0:* LISTEN
#/usr/local/nagios/libexec/check_nrpe -H 127.0.0.1
NRPE v2.15
关闭Nrpe
# ps -ef | grep -v grep | grep nrpe
# kill -9 进程号
检测nagios
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# /usr/local/nagios/bin/nagios-v /usr/local/nagios/etc/nagios.cfg
Total Warnings: 0
Total Errors: 0 表示OK
启动nagios
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# service nagios startstoprestart 开启停止重启
http://IP/nagios
安装 pnp4nagios 插件
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# tar zxf pnp4nagios-0.6.19.tar.gz
# cd pnp4nagios-0.6.19
#./configure
make all
make install
make install-config
make install-init
make install-webconf
创建默认配置文件
cd /usr/local/pnp4nagios/etc
cp misccommands.cfg-sample misccommands.cfg
cp nagios.cfg-sample nagios.cfg
cp rra.cfg-sample rra.cfg
cd pages
cp web_traffic.cfg-sample web_traffic.cfg
cd ../check_commands/
cp check_all_local_disks.cfg-samplecheck_all_local_disks.cfg
cp check_nrpe.cfg-sample check_nrpe.cfg
cp check_nwstat.cfg-sample check_nwstat.cfg
cp /usr/local/pnp4nagios/libexec/* /usr/local/nagios/libexec/
vim /usr/local/nagios/etc/nagios.cfg
检查
enable_environment_macros=1
process_performance_data=1
host_perfdata_command=process-host-perfdata
service_perfdata_command=process-service-perfdata
提示：如果nagios版本是4.X，上面配置会导致后面，生成不了流量图，报如下错误
PNP4Nagios Version 0.6.19
Please check the documentation for information about the following error.
perfdata directory "/usr/local/pnp4nagios/var/perfdata/localhost" for host "localhost" does not exist.Read FAQ online
file :
application/models/data.php :
back
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出现这个错误的原因是参照
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解决方案是使用 Bulk Mode方式
vim /usr/local/nagios/etc/nagios.cfg
检查
enable_environment_macros=1
process_performance_data=1
添加到最后即可
# service performance data
service_perfdata_file=/usr/local/pnp4nagios/var/service-perfdata
service_perfdata_file_template=DATATYPE::SERVICEPERFDATA TIMET::$TIMET$ HOSTNAME::$HOSTNAME$ SERVICEDESC::$SERVICEDESC$ SERVICEPERFDATA::$SERVICEPERFDATA$ SERVICECHECKCOMMAND::$SERVICECHECKCOMMAND$ HOSTSTATE::$HOSTSTATE$ HOSTSTATETYPE::$HOSTSTATETYPE$ SERVICESTATE::$SERVICESTATE$ SERVICESTATETYPE::$SERVICESTATETYPE$
service_perfdata_file_mode=a
service_perfdata_file_processing_interval=15
service_perfdata_file_processing_command=process-service-perfdata-file
# host performance data starting with Nagios 3.0
host_perfdata_file=/usr/local/pnp4nagios/var/host-perfdata
host_perfdata_file_template=DATATYPE::HOSTPERFDATA TIMET::$TIMET$ HOSTNAME::$HOSTNAME$ HOSTPERFDATA::$HOSTPERFDATA$ HOSTCHECKCOMMAND::$HOSTCHECKCOMMAND$ HOSTSTATE::$HOSTSTATE$ HOSTSTATETYPE::$HOSTSTATETYPE$
host_perfdata_file_mode=a
host_perfdata_file_processing_interval=15
host_perfdata_file_processing_command=process-host-perfdata-file
保存
vim/usr/local/nagios/etc/objects/commands.cfg
define command{
command_name check_nrpe
command_line $USER1$/check_nrpe-H $HOSTADDRESS$ -c $ARG1$
} #这一段放在上面即可
如下：同步模式设定方法添加到末尾就可以，记住在这个配置文件里面， 默认有这个配置，需要找到注释掉，然后将下面的配置添加，如果不注释掉，在你检查nagios的配置文件的时候会报错
define command{
command_name process-service-perfdata-file
command_line /usr/local/pnp4nagios/libexec/process_perfdata.pl --bulk=/usr/local/pnp4nagios/var/service-perfdata
}
define command{
command_name process-host-perfdata-file
command_line /usr/local/pnp4nagios/libexec/process_perfdata.pl --bulk=/usr/local/pnp4nagios/var/host-perfdata
}
定义pnp的主机和服务两个模版添加在最后面
vim /usr/local/nagios/etc/objects/templates.cfg
define host {
name host-pnp
action_url /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=_HOST_
register0
}
define service {
name service-pnp
action_url /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=$SERVICEDESC$
register0
}
也可以添加在，其他参数下面省略了，下面这个方法可以减少很多配置主机启用pnp时的时间
vim /usr/local/nagios/etc/objects/templates.cfg
define host {
action_url /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=_HOST_
}
define service {
action_url /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=$SERVICEDESC$
}
先做一下pnp4nagios环境测试添加在httpd.conf最后面
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vim /etc/httpd/conf/httpd.conf
Alias /pnp4nagios "/usr/local/pnp4nagios/share"
AllowOverride None
Order allow,deny
Allow from all
AuthName "Nagios Access"
AuthType Basic
AuthUserFile /usr/local/nagios/etc/htpasswd
Require valid-user
RewirteEngine On
Options FollowSymLinks
RewirteBase /pnp4nagios
RewirteRule ^(application|modules|system) -
RewirteCond %{REQUEST_FILENAME} !-f
RewirteCond %{REQUEST_FILENAME} !-d
RewirteRule .* index.php/$0
service httpd restart
访问 http://IP/pnp4nagios
cd /usr/local/pnp4nagios/share/
mv install.php install.php.bak
编辑nagios.cfg文件
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vim /usr/local/nagios/etc/nagios.cfg
cfg_file=/usr/local/nagios/etc/objects/commands.cfg
cfg_file=/usr/local/nagios/etc/objects/contacts.cfg
cfg_file=/usr/local/nagios/etc/objects/timeperiods.cfg
cfg_file=/usr/local/nagios/etc/objects/templates.cfg
cfg_file=/usr/local/nagios/etc/objects/localhost.cfg
cfg_file=/usr/local/nagios/etc/objects/hosts.cfg
cfg_file=/usr/local/nagios/etc/objects/hostgroup.cfg
cfg_file=/usr/local/nagios/etc/objects/services.cfg
或者
cfg_file=/usr/local/nagios/etc/objects/commands.cfg
cfg_file=/usr/local/nagios/etc/objects/contacts.cfg
cfg_file=/usr/local/nagios/etc/objects/timeperiods.cfg
cfg_file=/usr/local/nagios/etc/objects/templates.cfg
cfg_file=/usr/local/nagios/etc/objects/localhost.cfg
cfg_dir=/usr/local/nagios/etc/objects/apps
提示：此操作只是启用了linux主机监控，没有启用windows和switch，如果需要把注释去掉即可，第一种和第二种都可以
区别是：第一种共同使用一个配置文件，第二种独立使用配置文件，这里我都会演示，下面以第一种和第二种进行区分
添加主机配置，第一种方法
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默认nagios/etc/objects/ 下面没有 service.cfg host.cfg hostgroup.cfg 这几个配置文件，需要手动添加
vim hosts.cfg
define host{
use linux-server,host-pnp #这个是根据templates.cfg信息定义，如果上面定义的模板host-pnp添加在define host和define sevice里面，这儿host-pnp可以不用加，因为linux-server已经包含了
host_name cacti #必须是 被监控的主机名
alias cacti-web #别名随便定义
address 192.168.0.3 #主机ip地址
contact_groups admins #邮件组，下面会演示
}
define host{
use linux-server,host-pnp
host_name nginx
alias nginx-web
address 192.168.0.4
contact_groups admins
}
有多少机器就这样添加多少台
vim hostgroup.cfg
define hostgroup{
hostgroup_name servers #组名
alias servers_group #别名
members cacti,nginx #主机名 多个 逗号 隔开
}
vim service.cfg #所有主机在同一配置文件，很乱
#### set cacti host
define service{
use local-service,services-pnp
host_name cacti
service_descriptionhttp
check_command check_http
contact_groups admins
flap_detection_enabled 0
}
define service{
use local-service,services-pnp
host_name cacti
service_description SSH_port
check_command check_tcp!22
contact_groups admins
flap_detection_enabled 0
}
define service{
use local-service,services-pnp
host_name cacti
service_description check_/
check_command check_nrpe!check_/#使用nrpe检测，客户端需要定义
contact_groups admins
flap_detection_enabled 0
}
#### set nginx host
define service{
use local-service,service-pnp
host_name nginx
service_description Check_free_mem
check_command check_nrpe!check_free_mem
contact_groups admins
flap_detection_enabled 0
}
define service{
use local-service,services-pnp
host_name nginx
service_description check_/
check_command check_nrpe!check_/#使用nrpe检测，客户端需要定义
contact_groups admins
flap_detection_enabled 0
}
有多少就需要添加多少，第一种方法 end
添加主机配置，第二种方法
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cd nagios/etc/objects/
mkdir app
cd app
vim 192.168.0.2.cfg#在一个独立的文件定义所有监控对象，这个没有定义组，意义不大
###定义host
define host{
use linux-server,host-pnp #这个是根据templates.cfg信息定义，如果上面定义的模板host-pnp添加在define host和define sevice里面，这儿host-pnp可以不用加，因为linux-server已经包含了
host_name nginx #必须是 被监控的主机名
alias nginx-web #别名随便定义
address 192.168.0.4 #主机ip地址
contact_groups admins #邮件组，下面会演示
}
###定义service
define service{
use local-service,service-pnp
host_name nginx
service_description Check_free_mem
check_command check_nrpe!check_free_mem
contact_groups admins
flap_detection_enabled 0
}
define service{
use local-service,services-pnp
host_name nginx
service_description check_/
check_command check_nrpe!check_/#使用nrpe检测，客户端需要定义
contact_groups admins
flap_detection_enabled 0
}
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vim 192.168.0.3.cfg
###定义host
define host{
use linux-server,host-pnp #这个是根据templates.cfg信息定义，如果上面定义的模板host-pnp添加在define host和define sevice里面，这儿host-pnp可以不用加，因为linux-server已经包含了
host_name cacti #必须是 被监控的主机名
alias cacti-web #别名随便定义
address 192.168.0.3 #主机ip地址
contact_groups admins #邮件组，下面会演示
}
###定义service
define service{
use local-service,service-pnp
host_name cacti
service_description Check_free_mem
check_command check_nrpe!check_free_mem
contact_groups admins
flap_detection_enabled 0
}
define service{
use local-service,service-pnp
host_name cacti
service_description Check_free_mem
check_command check_nrpe!check_free_mem
contact_groups admins
flap_detection_enabled 0
}
这种办法比第一种方便许多，添加主机2种方法 END
nagios邮件报警设置
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# vim contacts.cfg#参数详解，请百度
define contact{
contact_name nagiosadmin
use generic-contact
alias Nagios Admin service_notification_period 24x7
host_notification_period 24x7
service_notification_options w,u,c,r
host_notification_options d,u,r
service_notification_commands notify-service-by-email
host_notification_commands notify-host-by-email
email xxxx@163.com
}
define contactgroup{
contactgroup_name admins#这个就是上面那个admins
alias Nagios Administrators
members nagiosadmin
}
检查配置文件是否有错
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/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
Total Warnings: 0
Total Errors: 0
Things look okay - No serious problems were detected during the pre-flight check
service nagios restart
服务端配置 end
客户端安装配置
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需要安装net-snmp，如果有其他错误根据提示进行解决
yum -y install net-snmp*
1、创建nagios程序用户、组
# useradd -s /sbin/nologin nagios
# mkdir /usr/local/nagios
# chown -R nagios.nagios /usr/local/nagios/
2、安装nagios-plugins 插件
# tar zxf nagios-plugins-1.4.16.tar.gz
# cd nagios-plugins-1.4.16
# ./configure --prefix=/usr/local/nagios/
# make
# make install
# echo $?
0
3、安装 Nrpe 插件
# tar zxf nrpe-2.15.tar.gz
# cd nrpe-2.15
# ./configure;make all;make install-plugin;make install-daemon;make install-daemon-config
编辑nrpe.cfg
sed -I 's/allowed_hosts=127.0.0.1/allowed_hosts=127.0.0.1,192.168.0.2/g' /usr/local/nagios/etc/nrpe.cfg
vim /usr/local/nagios/etc/nrpe.cfg
command=/usr/local/nagios/libexec/check_swap -w 20% -c 10%
command=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /data
command=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /
command=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z
command=/usr/local/nagios/libexec/check_procs -w 150 -c 200
保存
echo "/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg-d" >> /etc/rc.local
启动Nrpe
# /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d
# netstat -antl |grep 5666
tcp 0 0 0.0.0.0:5666 0.0.0.0:* LISTEN
这个在服务端操作，确保ok，如果不能请检查客户端防火墙和网络是否允许通信
#/usr/local/nagios/libexec/check_nrpe -H 192.168.0.3
NRPE v2.15
关闭Nrpe
# ps -ef | grep -v grep | grep nrpe
# kill -9 进程号
pnp不出图时候，查看日志
vim /usr/local/pnp4nagios/etc/process_perfdata.cfg
修改
LOG_LEVEL = 0
为
LOG_LEVEL = 2
more /usr/local/pnp4nagios/var/perfdata.log
提示：nagios 监控进程时候，即便pnp配置ok，也不会出图，例如下面的
Total Processes
OK10-20-2014 16:44:4583d 1h 9m 16s1/3PROCS OK: 503 processes
zombie_procs
OK10-20-2014 16:46:0083d 1h 7m 58s1/3PROCS OK: 0 processes with STATE = Z
PNP4Nagios Version 0.6.19
Please check the documentation for information about the following error.XML file "/usr/local/pnp4nagios/var/perfdata/app-11/Total_Processes.xml" not found. Read FAQ online
file :application/models/data.php :
back
至于原因可以参考，非常详细
http://storysky.blog./628458/583787/
Nagios如果系统监控插件满足不了需求，可以自行开发插件
例如下面是一个内存监控插件，插件是百度找的还是不错的，我这里借用一下
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vim /usr/local/nagios/libexec/check_mem
#!/bin/bash
STAT_OK=0
STAT_WARNING=1
STAT_CRITICAL=2
STAT_UNKNOWN=3
total_mem=`free -m |awk 'NR==2{print $2}'`
used_mem=`free -m |awk 'NR==3{print $3}'` #取的是系统真正用掉的内存
free_mem=`free -m |awk 'NR==3{print $4}'` #取的是free+cache的内存
use_per=`echo "scale=2;$used_mem/$total_mem"|bc|sed 's/^.//g'`
help() {
echo "USAGE:`basename $0` [-w][-c][-h]"
exit -1
}
while getopts ":w:c:h" opt
do
case $opt in
w) warning=$OPTARG
;;
c) critical=$OPTARG
;;
h) help
;;
?) unkown=$OPTARG
echo "error,plase check for help,USAGE:./`basename $0` -h"
exit $STAT_UNKNOWN
;;
esac
done
if [[ $use_per -lt $warning ]];
then
echo "OK - total:$total_mem MB,used:$used_mem MB,free:$free_mem MB | total_mem=$total_mem used_mem=$used_mem free_mem=$free_mem"
exit $STAT_OK
elif [[ $use_per -ge $warning ]] && [[ $use_per -lt $critical ]];
then
echo "WARNING - total:$total_mem MB,used:$used_mem MB,free:$free_mem MB | total_mem=$total_mem used_mem=$used_mem free_mem=$free_mem"
exit $STAT_WARNING
else
echo "CRITICAL - total:$total_mem MB,used:$used_mem MB,free:$free_mem MB | total_mem=$total_mem used_mem=$used_mem free_mem=$free_mem"
exit $STAT_CRITICAL
fi
fi
保存
chown nagios.nagios check_mem
chmod +x check_mem
./check_mem -w 80 -c 90
OK - total:15926 MB,used:1839 MB,free:14086 MB | total_mem=15926 used_mem=1839 free_mem=14086
vim /usr/local/nagios/etc/nrpe.cfg
添加
command=/usr/local/nagios/libexec/check_mem -w 80 -c 90
重启nrpe
在编辑/usr/local/nagios/etc/objects/app/的文件
添加
define service{
use local-service,service-pnp
host_name cacti
service_description Check_free_mem
check_command check_nrpe!check_free_mem
contact_groups admins
flap_detection_enabled 0
}
检查nagios 重启nagios
Windows和交换机监控配置不难，只要思路清晰，肯定能弄出来，nagios配置其实不难，就是有点麻烦而已，只要把配置文件的关系弄明白，一切都很简单
到此全部结束
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