Nagios+pnp两键轻松搞定

近期在做一个Nagios，果然如其名--“难过死”，不过做出来之后，还是蛮爽的，然后感觉不尽兴，就写了两个脚本实现起功能。

  系统环境：centos5.7 x86_64 

  硬件环境：XenServer

  内存3G，一颗双核CPU

    Nagios是一款开源的免费网络监视工具，能有效监控Windows、Linux和Unix的主机状态，交换机路由器等网络设置，打印机等。在系统或服务状态异常时发出邮件或短信报警第一时间通知网站运维人员，在状态恢复后发出正常的邮件或短信通知。

Nagios具有的功能：

1. 监控网络服务（SMTP、POP3、HTTP、NNTP、PING等）；
2. 监控主机资源（处理器负荷、磁盘利用率等）；
3. 简单地插件设计使得用户可以方便地扩展自己服务的检测方法；
4. 并行服务检查机制；
5. 具备定义网络分层结构的能力，用"parent"主机定义来表达网络主机间的关系，这种关系可被用来发现和明晰主机宕机或不可达状态；
6. 当服务或主机问题产生与解决时将告警发送给联系人（通过EMail、短信、用户定义方式）；
7. 可以定义一些处理程序，使之能够在服务或者主机发生故障时起到预防作用；
8. 自动的日志滚动功能；
9. 可以支持并实现对主机的冗余监控；
10. 可选的WEB界面用于查看当前的网络状态、通知和故障历史、日志文件等；

首先要了解nagios的工作原理，他是通过插件管理的，这些插件均可以自己编写：

 

接下来就是简单的脚本实现Nagios+pnp绘图过程，首先是服务端脚本：

#!/bin/bash
#:Title:Nagios server install
#:Synopsis:
#:Data:2012-07-18 13:36:32
#:Version:1.1
#:Author:LuoWei <luoweiro@126.com>
#:Options:
#This is an install Nagios's script

Nagios_user=nagios
Nagios_password=baison
Pack_path=`pwd`
Mail=282127408@qq.com

yum -y install httpd gettext mysql mysql-server mysql-devel php53 php53-mysql php-pear
yum install   perl  perl-DBI perl-DBD-MySQL gcc glibc glibc-common gd gd-devel openssl-devel -y

useradd $Nagios_user && echo $Nagios_password |passwd --stdin $Nagios_user
usermod -s /sbin/nologin $Nagios_password
groupadd nagcmd
usermod -G nagcmd $Nagios_password
usermod -G nagcmd apache

#install nagios
cd $Pack_path
  tar xf nagios-cn-3.2.3.tar.bz2
  cd  nagios-cn-3.2.3
  ./configure --prefix=/usr/local/nagios --with-nagios-user=nagios --with-nagios-group=nagios --with-command-group=nagcmd
  make all
  make install
  make install-init
  make install-commandmode
  make install-config
  make install-webconf
  make install-commandmode

#install nagios-plugins
cd $Pack_path
  tar xf nagios-plugins-1.4.15.tar.gz
  cd nagios-plugins-1.4.15
  sed -i 's/email.*/email  '$Mail'/'  /usr/local/nagios/etc/objects/contacts.cfg
  ./configure --with-nagios-user=nagios --with-nagios-group=nagios
  make && make install

#install nagios-snmp-plugins
#cd $Pack_path
#tar xf nagios-snmp-plugins.1.1.1.tgz
#cd nagios_plugins/
ln -sv /usr/local/nagios/bin/nagios /usr/local/bin/
sed -i "/^#ServerName/i\ServerName 127.0.0.1:80" /etc/httpd/conf/httpd.conf

chkconfig --add nagios
chkconfig nagios on
chkconfig httpd on
chkconfig mysqld on
service nagios start
service httpd start
service mysqld start

cp /usr/local/nagios/etc/nagios.cfg{,.bak}
#nrpe install
cd $Pack_path
  tar xf nrpe-2.12.tar.gz
  cd nrpe-2.12
  ./configure
  make && make install
  chown -R nagios:nagios /usr/local/nagios

#install pnp
cd $Pack_path
  tar xf rrdtool-1.4.5.tar.gz
  cd rrdtool-1.4.5
  yum install -y pango pango-devel freetype freetype-devel libpng libpng-devel gettext gettext-devel libjpeg libjpeg-devel gd gd-devel libxml2 libxml2-devel libiconv libiconv-devel  qpixman qpixman-devel glib glib-devel cairo cairo-devel libart*  php53-gd
  ./configure --prefix=/usr/local/rrdtool
  make && make install

cd $Pack_path
  tar xf pnp4nagios-0.6.6.tar.gz
  cd pnp4nagios-0.6.6
  ./configure --prefix=/usr/local/pnp4nagios --with-rrdtool=/usr/local/rrdtool/bin/rrdtool --with-nagios-user=nagios --with-nagios-group=nagcmd
  make all
  make install
  make install-webconf
  make install-config
  make install-init
  make fullinstall
  cd /usr/local/pnp4nagios/etc/
  mv misccommands.cfg-sample misccommands.cfg
  mv nagios.cfg-sample nagios.cfg
  mv rra.cfg-sample rra.cfg
  cd pages/
  mv web_traffic.cfg-sample web_traffic.cfg
  cd ../check_commands/
  mv check_all_local_disks.cfg-sample check_all_local_disks.cfg
  mv check_nrpe.cfg-sample check_nrpe.cfg
  mv check_nwstat.cfg-sample check_nwstat.cfg
  cp /usr/local/nagios/etc/nagios.cfg{,.bak}
  sed -i 's@#host_perfdata_command=process-host-perfdata@host_perfdata_command=process-host-perfdata@' /usr/local/nagios/etc/nagios.cfg
  sed -i '/cfg_file=.*localhost.cfg/d' /usr/local/nagios/etc/nagios.cfg
  cp /usr/local/pnp4nagios/libexec/process_perfdata.pl /usr/local/nagios/libexec/
  cp /usr/local/src/pnp4nagios-0.6.6/contrib/ssi/status-header.ssi /usr/local/nagios/share/ssi/
  cp /usr/local/nagios/etc/objects/commands.cfg{,.bak}
  sed -i '227,247d' /usr/local/nagios/etc/objects/commands.cfg
  cat >>/usr/local/nagios/etc/objects/commands.cfg <<EOF
define command {
    command_name process-host-perfdata
    command_line /usr/bin/perl /usr/local/pnp4nagios/libexec/process_perfdata.pl -d HOSTPERFDATA
}
define command {
    command_name process-service-perfdata
    command_line /usr/bin/perl /usr/local/pnp4nagios/libexec/process_perfdata.pl
}
EOF

  cp /usr/local/nagios/etc/objects/templates.cfg{,.bak}
  cat >>/usr/local/nagios/etc/objects/templates.cfg <<EOF
define host {
    name host-pnp
    register 0
    action_url /pnp4nagios/index.php?host=\$HOSTNAME\$
}
define service {
    name srv-pnp
    register 0
    action_url /pnp4nagios/index.php?host=\$HOSTNAME\$&srv=\$SERVICEDESC\$
}
EOF

mv /usr/local/pnp4nagios/share/install.php /usr/local/pnp4nagios/share/install.php.bak
sed -i  's/use_authentication=1/use_authentication=0/' /usr/local/nagios/etc/cgi.cfg
mkdir -pv /usr/local/nagios/etc/{hosts,services}
sed -i "/#cfg_dir.*servers/i\cfg_dir=/usr/local/nagios/etc/hosts" /usr/local/nagios/etc/nagios.cfg
sed -i "/#cfg_dir.*servers/i\cfg_dir=/usr/local/nagios/etc/services" /usr/local/nagios/etc/nagios.cfg

#config the commands.cfg to supports check_nrpe command
cat >>/usr/local/nagios/etc/objects/commands.cfg <<EOF
define command{
        command_name check_nrpe
        command_line \$USER1\$/check_nrpe -H \$HOSTADDRESS\$ -c \$ARG1\$
        }
EOF

cat >/usr/local/nagios/etc/objects/contacts.cfg <<EOF
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,notify-service-by-sms
    host_notification_commands  notify-host-by-email,notify-host-by-sms
        email                    $Mail
        pager                   13524942642
        }
define contactgroup{
        contactgroup_name       admins
        alias                   Nagios Administrators
        members                 nagiosadmin
        }
EOF

#install fetion
cd $Pack_path
cd fetion/lib64/
chmod +x *
cp *.so *.so.4 /usr/lib/
cp fetion /usr/local/bin/

cd $Pack_path
tar xf check_mysql_health-2.1.tar.gz
  cd check_mysql_health-2.1
  ./configure
  make
  make install
yum install perl-DBD* -y

cat >>/usr/local/nagios/etc/objects/commands.cfg <<EOF
define command{
        command_name    check_mysql_health
        command_line    \$USER1\$/check_mysql_health --hostname \$ARG1\$ --port \$ARG2\$ --username \$ARG3\$ --password \$ARG4\$ --mode \$ARG5\$ --warning \$ARG6\$ --critical \$ARG7\$
        }
EOF
htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin