搭建 CentOS 6 服务器(17) - Cacti、Nagios

（一）Cacti
*** 需要先安装Apache + MySQL + PHP（php-snmp）

（1）安装Net-SNMP
# yum -y install net-snmp
# cp -p /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.org
# vi /etc/snmp/snmpd.conf

引用

  #       sec.name  source          community
  #com2sec notConfigUser  default       public　←注释掉
  com2sec local localhost private　←
  com2sec mynetwork 192.168.21.0/24 public　←

  #       groupName      securityModel securityName
  #group   notConfigGroup v1c           notConfigUser　←注释掉
  #group   notConfigGroup v2c           notConfigUser　←注释掉
  group MyROGroup v1 local　←
  group MyROGroup v2c local　←
  group MyROGroup v1 mynetwork　←
  group MyROGroup v2c mynetwork　←

  # Make at least  snmpwalk -v 1 localhost -c public system fast again.
  #       name           incl/excl     subtree         mask(optional)
  #view    systemview    included   .1.3.6.1.2.1.1　←注释掉
  #view    systemview    included   .1.3.6.1.2.1.25.1.1　←注释掉
  view all included .1 80　←

  # Finally, grant the group read-only access to the systemview view.

  #       group          context sec.model sec.level prefix read   write  notif
  #access  notConfigGroup ""      any       noauth    exact  systemview none none　←注释掉
  access MyROGroup "" any noauth exact all none none　←
  access MyRWGroup "" any noauth exact all all none　←

  # Check the / partition and make sure it contains at least 10 megs.
  #disk / 10000
  disk / 10000　←

# /etc/init.d/snmpd start

（2）安装RRDtool & cacti
# vi /etc/yum.repos.d/CentOS-Base.repo

引用

  [dag]
  name=Dag RPM Repository for Red Hat Enterprise Linux
  baseurl=http://ftp.riken.jp/Linux/dag/redhat/el$releasever/en/$basearch/dag/
  gpgcheck=1
  enabled=0

# wget http://dag.wieers.com/packages/RPM-GPG-KEY.dag.txt
# rpm --import RPM-GPG-KEY.dag.txt
# yum -y install --enablerepo=dag rrdtool
# yum -y install --enablerepo=dag cacti

（3）设置

创建数据库
# mysql -u root -p

引用

  mysql> create database cacti;
  mysql> GRANT ALL ON cacti.* TO cacti@localhost IDENTIFIED BY 'your-password-here';
  mysql> FLUSH privileges;
  mysql> quit;

# rpm -ql cacti | grep cacti.sql
  /usr/share/doc/cacti-0.8.8b/cacti.sql
# mysql -u cacti -p cacti < /usr/share/doc/cacti-0.8.8b/cacti.sql

设置cacti
# vi /etc/cacti/db.php

引用

  $database_type = "mysql";
  $database_default = "cacti";
  $database_hostname = "localhost";
  $database_username = "cacti";
  $database_password = "your-password-here";
  $database_port = "3306";
  $database_ssl = false;

设置Apache
# vi /etc/httpd/conf.d/cacti.conf

引用

  Alias /cacti/ /var/www/cacti/
  <Directory /var/www/cacti/>
        DirectoryIndex index.php
        Options -Indexes
        AllowOverride all
        order deny,allow
        deny from all
        allow from 127.0.0.1
        allow from 192.168.1.0/24　←
        AddType application/x-httpd-php .php
        php_flag magic_quotes_gpc on
        php_flag track_vars on
  </Directory>

# /etc/init.d/httpd restart

设置自动收集数据
# vi /etc/cron.d/cacti

引用

  */5 * * * *    cacti   /usr/bin/php /usr/share/cacti/poller.php > /dev/null 2>&1

（4）确认
http://<youripaddress>/cacti/
第一次需要按照向导设置。

（二）Nagios
# yum -y install gd-devel
# useradd -d /usr/local/nagios/ -M nagios

安装Nagios
# cd /usr/local/src
# wget http://jaist.dl.sourceforge.net/sourceforge/nagios/nagios-4.0.8.tar.gz -O nagios-4.0.8.tar.gz
# tar zxvf nagios-4.0.8.tar.gz
# cd nagios-4.0.8
# ./configure && make all && make fullinstall && make install-config

安装插件
# cd /usr/local/src
# wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz
# tar zxvf nagios-plugins-2.0.3.tar.gz
# cd nagios-plugins-2.0.3
# ./configure && make && make install

# cp contrib/check_mem.pl /usr/local/nagios/libexec/
# vi /usr/local/nagios/libexec/check_mem.pl

引用

  $command_line = `vmstat | tail -1 | awk '{print \$4,\$5}'`;
  ↓
  $command_line = `free | head -3 | tail -1 | awk '{print \$3,\$4}'`;　←

# chmod +x /usr/local/nagios/libexec/check_mem.pl

设置Nagios
# vi /usr/local/nagios/etc/nagios.cfg

引用

  cfg_dir=/usr/local/nagios/etc/servers　←去掉注释
  date_format=iso8601　←日期格式：YYYY-MM-DD HH:MM:SS

# vi /usr/local/nagios/etc/cgi.cfg

引用

  ttf_file=/usr/local/nagios/etc/font/font.ttf　←去掉注释

# mkdir /usr/local/nagios/etc/servers
# vi /usr/local/nagios/etc/objects/contacts.cfg

引用

  define contact{
        contact_name               nagiosadmin             ; Short name of user
        use                            generic-contact        ; Inherit default values from generic-contact template (defined above)
        alias                           Nagios Admin            ; Full name of user

        email                           <email>　←管理员邮件地址
  }

# vi /usr/local/nagios/etc/objects/localhost.cfg

引用

  define service{
        use                             local-service         ; Name of service template to use
        host_name                    localhost
        service_description          SSH
        check_command             check_ssh
        notifications_enabled        1　←
  }

  define service{
        use                             local-service         ; Name of service template to use
        host_name                    localhost
        service_description         HTTP
        check_command             check_http
        notifications_enabled        1　←
  }

# vi /usr/local/nagios/etc/objects/commands.cfg

# usermod -G nagios apache
# vi /etc/httpd/conf.d/nagios.conf

# /etc/rc.d/init.d/httpd reload
# htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

# /etc/rc.d/init.d/nagios start