Nagios是一款Linux上成熟的监视系统运行状态和网络信息的开原IT基础设施监视系统，Nagios能监视所指定的本地或远程主机及服务，例如HTTP服务、FTP服务等，同时提供异常通知、事件处理等功能，当主机或服务出现故障时，Nagios还可以通过邮件、手机短信等形式在第一时间进行通知。Nagios可运行在Linux和Unix平台上，同时提供一个可选的基于浏览器的Web界面，方便系统管理员查看系统的运行状态、网络状态、各种系统问题及日志异常等。
环境： 192.168.0.201 mysql主机 rhel6.4
192.186.0.202 nagios主机 rhel6.4
安装相关软件包：
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yum install httpd gcc make perl-ExtUtils-Embed.x86_64 -y
yum localinstall gd-devel-2.0.35-11.el6.x86_64.rpm -y
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安装nagios：
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useradd nagios
usermod -G nagios apache
#编译所需软件包
#运行 nagios 服务的用户
#使 apache 用户对 nagios 目录具有写权限,不然 web 页面操作失败
tar jxf nagios-cn-3.2.3.tar.bz2
#nagios 软件安装
cd nagios-cn-3.2.3
./configure –enable-embedded-perl
make all //根据提示完成安装
make install
make install-init
make install-commandmode
make install-config
make install-webconf //在apache下通过这条命令可以快速整合
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安装nagios-plugins：
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yum install mysql-devel openssl-devel -y
tar zxf nagios-plugins-1.4.15.tar.gz
cd nagios-plugins-1.4.15
./configure --with-nagios-user=nagios --with-nagios-group=nagios --enable-extra-opts --enable-libtap --enable-perl-modules
make
make install
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配置nagios：
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vi /usr/local/nagios/etc/nagios.cfg
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#cfg_file=/usr/local/nagios/etc/objects/localhost.cfg #注释掉localhost.cfg文件
cfg_file=/usr/local/nagios/etc/objects/services.cfg #新建 services.cfg 文件,存放服务与服务组定义
cfg_file=/usr/local/nagios/etc/objects/hosts.cfg #新建 hosts.cfg 文件,存放主机与主机组定义
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配置hosts.cfg：
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vi /usr/local/nagios/etc/objects/hosts.cfg
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define host{ //主机的管理
use linux-server //使用默认的主机规则
host_name vm2.example.com //主机名
alias Nagios vm2 //主机别名
address 127.0.0.1 //主机ip地址
icon_image switch.gif //图标
statusmap_image switch.gd2
2d_coords 100,200 //2D图像坐标
3d_coords 100,200,100 //3D图像坐标
}
define hostgroup{ //主机组的管理
hostgroup_name linux-servers //主机组名字
alias Linux Servers //别名
members * //*代表上面所有主机
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配置mysql
----建立nagdb专用数据库
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mysql> create database nagdb default CHARSET=utf8;
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Query OK, 1 row affected (0.01 sec)
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mysql> grant select on nagdb.* to 'nagios'@'%';
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Query OK, 0 rows affected (0.00 sec)
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mysql> update mysql.user set 'Password' = PASSWORD('nagios') where 'User'='nagios';
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ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''Password' = PASSWORD('nagios') where 'User'='nagios'' at line 1
mysql> update mysql.user set Password = PASSWORD('nagios') where user='nagios';
Query OK, 1 row affected (0.03 sec)
Rows matched: 1 Changed: 1 Warnings: 0
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mysql> flush privileges;
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Query OK, 0 rows affected (0.00 sec)
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----用以下命令来验证一下：
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[root@node2 etc]# /usr/local/nagios/libexec/check_mysql -H 192.168.1.152 -u nagios -d nagdb -p nagios
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Uptime: 3374 Threads: 1 Questions: 11 Slow queries: 0 Opens: 33 Flush tables: 1 Open tables: 26 Queries per second avg: 0.003
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备注:如果出现：/usr/local/nagios/libexec/check_mysql: error while loading shared libraries: libmysqlclient.so.18: cannot open shared object file: No such file or directory
请查看$MYSQL_HOME/lib
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[root@node2 lib]# ln -s ./libmysqlclient.so.18.0.0 /usr/lib/libmysqlclient.so.18
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配置nrpe.cfg
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[root@node2 etc]# tail /usr/local/nagios/etc/nrpe.cfg
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command[check_mysql]=/usr/local/nagios/libexec/check_mysql -H 192.168.1.152 -u nagios -d nagdb -p nagios //加入此行
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配置nagios服务端
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[root@node1 etc]# cat services.cfg //加入下面内容
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define service{
use local-service
host_name node2
service_description mysql
check_command check_nrpe!check_mysql
notifications_enabled 1
}
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最后重启nrpe和服务端的nagios。