nagios

环境为centos8.5，记得换指令

一. 服务端安装准备

需要LNMP环境

1. 更新源

sed -i 's/enabled=1/enabled=0/g' /etc/yum.repos.d/*

[BaseOS]
name=BaseOS
baseurl=file:///media/cdrom/BaseOS
enabled=1
gpgcheck=0
[AppStream]
name=AppStream
baseurl=file:///media/cdrom/AppStream
enabled=1
gpgcheck=0

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2. 解决perl软件编译问题

echo 'export LC_ALL=C' >>/etc/profile
source /etc/profile
 
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3. 关闭防火墙和selinux

/etc/init.d/iptables stop
chkconfig iptables off
 
sed -i 's/SELINUX=enforcing/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
setenforce 0
 
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4. 解决系统时间同步问题
   crontab -e中添加
   */5 * * * * /usr/sbin/ntpdate pool.ntp.org > /dev/null 2>&1

systemctl restart chronyd
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5. 安装服务器所需软件包

yum install -y gcc glibc glibc-common gd gd-devel mysql-server httpd php php-gd -y
 
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6. 创建nagios服务器所需用户及组

useradd nagios
useradd apache -M -s /sbin/nologin
groupadd nagcmd
usermod -aG nagcmd nagios
usermod -aG nagcmd apache
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7. 启动HTTP服务

/etc/init.d/httpd start
检查 lsof -i :80
 
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二. 安装配置 nagios服务端

1. 下载nagios并编译

wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.5.0.tar.gz(需FQ）
tar xf nagios-3.5.0.tar.gz
cd nagios
./configure --with-command-group=nagcmd
make all
make install
make install-init
make install-commandmode
make install-config
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2. 安装nagios web配置文件及创建登陆用户

make install-webconf
htpasswd -bc /usr/local/nagios/etc/htpasswd.users syh 123    #设置nagios页面用户名和密码
/etc/init.d/httpd reload
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3. 添加监控报警信息接收的email地址
   vim /usr/local/nagios/etc/objects/contacts.cfg +35
   ******@qq.com
   修改原email地址为接收报警的邮箱地址

4. 安装第三方邮件服务

yum install mailx
修改/etc/mail.rc，添加如下配置
set from=pshyms@163.com
set smtp=smtp.163.com
set smtp-auth-user=pshyms
set smtp-auth-password=xxxx  #这里要写SMTP授权码，需要到邮箱设置中开通
set smtp-auth=login
 
使用mail命令发送邮件:
echo "邮件内容"|mail -s 标题 xxx@163.com
mail -s 标题 xxx@163.com < file
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5. 配置启动Apache服务

/etc/init.d/httpd start
chkconfig httpd on
此时浏览器访问http://192.168.0.236/nagios(ip 为服务端地址）会出现用户名和密码提示窗口
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6. 安装nagios插件软件包

yum install perl-devel openssl-devel -y
wget http://nagios-plugins.org/download/nagios-plugins-2.3.3.tar.gz
tar xf 
cd 
./configure --with-nagios-user=nagios \
--with-nagios-group=nagios \
--enable-perl-modules \
--with-mysql
make && make install

ls /usr/local/nagios/libexec/| wc -l

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7. 安装nrpe软件

wget http://downloads.sourceforge.net/project/nagios/nrpe-2.x/nrpe-2.14/nrpe-2.14.tar.gz
或wget https://jaist.dl.sourceforge.net/project/nagios/nrpe-2.x/nrpe-2.12/nrpe-2.12.tar.gz

tar zxvf nrpe-2.14.tar.gz
cd nrpe-2.14
./configure
make all
make install-plugin
make install-daemon
make install-daemon-config
 
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8. 配置并启动nagios服务

chkconfig nagios on
或者 echo "/etc/init.d/nagios start >> /etc/rc.local
验证nagios配置文件（检查语法） /etc/init.d/nagios checkconfig
使用命令检查报错 /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
启动nagios服务 /etc/init.d/nagios start
 
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三. 客户端安装

1. 安装初始化软件

yum install gcc glibc glibc-common mysql-server perl-devel perl-CPAN openssl-devel -y
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2. 添加nagios用户
   useradd nagios -M -s /sbin/nologin

3. 安装nagios-plugins插件

wget http://nagios-plugins.org/download/nagios-plugins-2.3.3.tar.gz
tar xf 
cd 
./configure --with-nagios-user=nagios \
--with-nagios-group=nagios \
--enable-perl-modules \
--with-mysql
make && make install
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4. 安装nrpe软件

wget http://downloads.sourceforge.net/project/nagios/nrpe-2.x/nrpe-2.14/nrpe-2.14.tar.gz
tar zxvf nrpe-2.14.tar.gz
cd nrpe-2.14
./configure
make all
make install-plugin
make install-daemon
make install-daemon-config
 
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yum install sysstat -y  #系统监控包
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配置监控内存，磁盘I/O脚本插件

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5. 配置nagios客户端nrpe服务

cd /usr/local/nagios/etc/nrpe.cfg的79行添加监控端IP，例如allowed_hosts=127.0.0.1,192.168.0.236

在199-203行为监控内容，需要根据需求进行调整修改
注释掉老的


command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
command[check_disk]=/usr/local/nagios/libexec/check_disk -w 15% -c 7% -p /
command[check_swap]=/usr/local/nagios/libexec/check_swap -w 20% -c 10%

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启动nrpe守护进程

/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrep.cfg -d
netstat -lntup | grep nrpe
ps -ef | grep nrpe
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需要注意的是每次修改nrpe.cfg文件都需要重启守护进程，可以pkill nrpe，再执行上面命令

可将上面命令加入/etc/rc.local中进行nrpe开机自启动