【nagios 二】nagios配置篇

旃麒雅 · 发表于 2019-1-15 09:36:02

　　上篇“自动化安装nagios”完成了nagios的服务器端的安装，现需要对nagios进行配置，实现基本的监控功能。
　　参考文章：老男孩的博客
　　南非蚂蚁的博客
　　实验环境：

CentOS 6.3 X86_64, VirtualBox 4.1.14
关闭防火墙和SELinux
nagios版本nagios-3.4.1
插件版本nagios-plugins-1.4.16
nrpe版本nrpe-2.13

　　实现步骤：

添加被监控服务器的机器名到配置文件hosts.cfg
添加被监控服务器的机器名到所属组的配置文件hostgrps.cfg
添加被监控服务器的服务类型到配置文件services.cfg
将nrpe添加到命令配置文件commands.cfg
将上述配置文件的路径放在nagios的主配置文件nagios.cfg里声明

　　开始配置：
　　声明一个变量为nagios安装路径

nagios_dir="/usr/local/nagios"

　　一，添加被监控的主机到hosts.cfg

cd $nagios_dir/etc/objects #进入nagios配置文件所在目录
[ -f new.host ] && rm -f new.host #判断new.host文件是否存在，若在则删除旧主机文件
exec < hosts.list #hosts.list为手动创建的文件，用于指定主机名和IP
while read line #从hosts.list提取主机名和IP并添加到new.host文件
do
echo "define host {" >> new.host
echo " use linux-server" >> new.host
echo " host_name `echo $line|awk '{print $1}'`" >> new.host
echo " alias `echo $line|awk '{print $1}'`" >> new.host
echo " address `echo $line|awk '{print $2}'`" >> new.host
echo "}" >> new.host
echo >> new.host
done
cat new.host >> hosts.cfg #将做好的主机模板添加到hosts.cfg文件

　　hosts.list文件需手动创建，格式为“主机名 IP地址”，可以一次添加多个,
　　若以后有新主机需要增加，则直接在hosts.list里清空旧内容，将新主机信息添加进去

test-machine1 192.168.0.100
test-machine2 192.168.0.101
test-machine3 192.168.0.102

　　new.host为生成的主机模板

define host {
use linux-server
host_name test-machine1
alias test-machine1
address 192.168.0.100
}

　　最后将生成好的主机模板添加到nagios所需要的主机文件hosts.cfg，里面都是生成好的所定义的被监控主机模板。
　　二，添加主机所属组
　　将被监控主机归到一个监控组里，这里仅生成一个组，其他以此类推

cd $nagios_dir/etc/objects
newhosts=`cat hosts.list|awk '{print $1}'|tr '\n' ','` #提取host.list文件里的主机名
if [ ! -f hostgrps.cfg ]; then #判断hostgrps.cfg文件是否存在
echo "define hostgroup {" >> hostgrps.cfg #添加hostgrps.cfg文件正文
echo " hostgroup_name lnx-srvs" >> hostgrps.cfg
echo " alias lnx-srvs" >> hostgrps.cfg
echo " members $newhosts" >> hostgrps.cfg
echo "}" >> hostgrps.cfg
sed -i.bak '/members/ s/,$//' hostgrps.cfg #去掉主机名结尾的逗号
else
sed -i.bak '/members/ s/^.*$/&,'$newhosts'/' hostgrps.cfg #若hostgrps文件已存在，则仅将新主机名追加到members那一列最后
sed -i.bak '/members/ s/,$//' hostgrps.cfg
fi

　　最终所生成的hostgrps.cfg文件名格式为

define hostgroup{
hostgroup_name lnx_srvs
alias lnx_srvs
members test-machine1,test-machine2
}

　　三，将nrpe添加到命令配置文件

echo"
define command{
command_name nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}" >> $natios_dir/etc/objects/commands.cfg

　　四，添加服务文件
　　接下来是比较重要的nagios监控的服务文件services.cfg

cd $nagios_dir/etc/objects
newhosts=`cat hosts.list|awk '{print $1}'|tr '\n' ','` #定义变量newhosts为提取的主机名
if [ ! -f services.cfg ]; then #判断services.cfg文件是否存在
echo " #若不存在则新增模板正文
define service{
use remote-service
host_name '$newhosts'
service_description Current Users On Remote System
check_command nrpe!check_users #监控主机当前登录的用户数量
}
define service{
use remote-service
host_name '$newhosts'
service_description Current System Loads
check_command nrpe!check_load #监控系统的负载
}
define service{
use remote-service
host_name '$newhosts'
service_description Zombie Processes On Remote System
check_command nrpe!check_zombie_procs #监控主机僵尸进程数量
}
define service{
use remote-service
host_name '$newhosts'
service_description Total Processes On Remote System
check_command nrpe!check_total_procs #监控主机总进程数量
}
define service{
use remote-service
host_name '$newhosts'
service_description Disk Using Of Remote System
check_command nrpe!check_disk #监控磁盘空间
}
define service{
use remote-service
host_name '$newhosts'
service_description Swap Using Of Remote System
check_command nrpe!check_swap #监控交换分区空间
}" > serverces.cfg
sed -i.bak '/host_name/ s/,$//' services.cfg #去掉host_name最后的逗号
else
sed -i.bak '/host_name/ s/^.*$/&,'$newhosts'/' services.cfg #若services.cfg已存在，则直接追加新主机名即可
sed -i.bak '/host_name/ s/,$//' services.cfg
fi

　　五，重启nagios服务
　　以上配置文件都需在nagios主配置文件nagios.cfg里声明

cfg_file=/usr/local/nagios/etc/objects/hosts.cfg
cfg_file=/usr/local/nagios/etc/objects/hostgrps.cfg
cfg_file=/usr/local/nagios/etc/objects/services.cfg

　　重启nagios服务

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
service nagios restart

　　至此，nagios服务器端配置基本完成，剩下的则需要在被监控主机做相关配置。
　　完整的配置脚本如下：

#!/bin/bash
#auto configure nagios settings
#2012-11-28
nagios_dir="/usr/local/nagios"
function Hosts_cfg()
{
cd $nagios_dir/etc/objects
[ -f new.host ] && rm -f new.host
exec < hosts.list
while read line
do
echo "define host {" >> new.host
echo " use linux-server" >> new.host
echo " host_name `echo $line|awk '{print $1}'`" >> new.host
echo " alias `echo $line|awk '{print $1}'`" >> new.host
echo " address `echo $line|awk '{print $2}'`" >> new.host
echo "}" >> new.host
echo >> new.host
done
cat new.host >> hosts.cfg
}
function Hostgrps_cfg()
{
cd $nagios_dir/etc/objects
newhosts=`cat hosts.list|awk '{print $1}'|tr '\n' ','`
if [ ! -f hostgrps.cfg ]; then
echo "define hostgroup {" >> hostgrps.cfg
echo " hostgroup_name lnx-srvs" >> hostgrps.cfg
echo " alias lnx-srvs" >> hostgrps.cfg
echo " members $newhosts" >> hostgrps.cfg
echo "}" >> hostgrps.cfg
sed -i.bak '/members/ s/,$//' hostgrps.cfg
else
sed -i.bak '/members/ s/^.*$/&,'$newhosts'/' hostgrps.cfg
sed -i.bak '/members/ s/,$//' hostgrps.cfg
fi
}
function Add_command()
{
echo"
define command{
command_name nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}" >> $natios_dir/etc/objects/commands.cfg
}
function Services_cfg()
{
cd $nagios_dir/etc/objects
newhosts=`cat hosts.list|awk '{print $1}'|tr '\n' ','`
if [ ! -f services.cfg ]; then
echo "
define service{
use remote-service
host_name '$newhosts'
service_description Current Users On Remote System
check_command nrpe!check_users
}
define service{
use remote-service
host_name '$newhosts'
service_description Current System Loads
check_command nrpe!check_load
}
define service{
use remote-service
host_name '$newhosts'
service_description Zombie Processes On Remote System
check_command nrpe!check_zombie_procs
}
define service{
use remote-service
host_name '$newhosts'
service_description Total Processes On Remote System
check_command nrpe!check_total_procs
}
define service{
use remote-service
host_name '$newhosts'
service_description Disk Using Of Remote System
check_command nrpe!check_disk
}
define service{
use remote-service
host_name '$newhosts'
service_description Swap Using Of Remote System
check_command nrpe!check_swap
}" > services.cfg
sed -i.bak '/host_name/ s/,$//' services.cfg
else
sed -i.bak '/host_name/ s/^.*$/&,'$newhosts'/' services.cfg
sed -i.bak '/host_name/ s/,$//' services.cfg
fi
}
function Restart_service()
{
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
service nagios restart
}
case $1 in
host)
Hosts_cfg
;;
group)
Hostgrps_cfg
;;
command)
Add_command
;;
service)
Services_cfg
;;
restart)
Restart_service
;;
*)
echo "Usage: ./setnagios.sh {host|group|command|service|restart}"
;;
esac

　　需要相应的功能时则运行脚本带上相应参数即可

./setnagios.sh host #添加主机
./setnagios.sh group #添加组或修改组成员
./setnagios.sh command #将nrpe添加到命令配置文件
./setnagios.sh service #添加服务文件或修改主机成员
./setnagios.sh restart #重启nagios 服务

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