1、查看check_disk脚本

[oracle@rhel5 ~]$ /usr/local/nagios/libexec/check_disk --hcheck_disk v1.4.15 (nagios-plugins 1.4.15)Copyright (c) 1999 Ethan Galstad 
     
      Copyright (c) 1999-2008 Nagios Plugin Development Team    
      
       This plugin checks the amount of used disk space on a mounted file systemand generates an alert if free space is less than one of the threshold valuesUsage: check_disk -w limit -c limit [-W limit] [-K limit] {
   -p path | -x device}[-C] [-E] [-e] [-g group ] [-k] [-l] [-M] [-m] [-R path ] [-r path ][-t timeout] [-u unit] [-v] [-X type]Options: -h, --help    Print detailed help screen -V, --version    Print version information -w, --warning=INTEGER    Exit with WARNING status if less than INTEGER units of disk are free -w, --warning=PERCENT%    Exit with WARNING status if less than PERCENT of disk space is free -c, --critical=INTEGER    Exit with CRITICAL status if less than INTEGER units of disk are free -c, --critical=PERCENT%    Exit with CRITCAL status if less than PERCENT of disk space is free -W, --iwarning=PERCENT%    Exit with WARNING status if less than PERCENT of inode space is free -K, --icritical=PERCENT%    Exit with CRITICAL status if less than PERCENT of inode space is free -p, --path=PATH, --partition=PARTITION    Path or partition (may be repeated) -x, --exclude_device=PATH 
       
            Ignore device (only works if -p unspecified) -C, --clear    Clear thresholds -E, --exact-match    For paths or partitions specified with -p, only check for exact paths -e, --errors-only    Display only devices/mountpoints with errors -g, --group=NAME    Group paths. Thresholds apply to (free-)space of all partitions together -k, --kilobytes    Same as '--units kB' -l, --local    Only check local filesystems -L, --stat-remote-fs    Only check local filesystems against thresholds. Yet call stat on remote filesystems    to test if they are accessible (e.g. to detect Stale NFS Handles) -M, --mountpoint    Display the mountpoint instead of the partition -m, --megabytes    Same as '--units MB' -A, --all    Explicitly select all paths. This is equivalent to -R '.*' -R, --eregi-path=PATH, --eregi-partition=PARTITION    Case insensitive regular expression for path/partition (may be repeated) -r, --ereg-path=PATH, --ereg-partition=PARTITION    Regular expression for path or partition (may be repeated) -I, --ignore-eregi-path=PATH, --ignore-eregi-partition=PARTITION    Regular expression to ignore selected path/partition (case insensitive) (may be repeated) -i, --ignore-ereg-path=PATH, --ignore-ereg-partition=PARTITION    Regular expression to ignore selected path or partition (may be repeated) -t, --timeout=INTEGER    Seconds before connection times out (default: 10) -u, --units=STRING    Choose bytes, kB, MB, GB, TB (default: MB) -v, --verbose    Show details for command-line debugging (Nagios may truncate output) -X, --exclude-type=TYPE    Ignore all filesystems of indicated type (may be repeated)Examples: check_disk -w 10% -c 5% -p /tmp -p /var -C -w 100000 -c 50000 -p /    Checks /tmp and /var at 10% and 5%, and / at 100MB and 50MB check_disk -w 100 -c 50 -C -w 1000 -c 500 -g sidDATA -r '^/oracle/SID/data.*$'    Checks all filesystems not matching -r at 100M and 50M. The fs matching the -r regex    are grouped which means the freespace thresholds are applied to all disks together check_disk -w 100 -c 50 -C -w 1000 -c 500 -p /foo -C -w 5% -c 3% -p /bar    Checks /foo for 1000M/500M and /bar for 5/3%. All remaining volumes use 100M/50MSend email to nagios-users@lists.sourceforge.net if you have questionsregarding use of this software. To submit patches or suggest improvements,send email to nagiosplug-devel@lists.sourceforge.net
       
      
     

    举例：

    Usage: check_disk -w limit -c limit {-p path | -x device}

    格式：check_disk -w 低限% -c 低限% -p 磁盘设备文件或则分区文件的绝对路径

    Options:

    选项

    -w, --warning=PERCENT%

        设定告警通知百分比数，空间低于该百分比则发出告警通知。

    -c, --critical=PERCENT%

        设定严重告警通知百分比数，空间低于该百分比则发出严重告警通知。

    -p, --path=PATH, --partition=PARTITION

        指定磁盘设备文件或则分区文件的绝对路径。

    #如果要监控根目录,达到80%报警,达到90%为严重危险

    check_disk -w 80% -c 90% -p /dev/hda1   #-p后面接需要监控的硬盘分区，如果是SCSI硬盘就是sda1，当然此时被监控端的nrpe配置文件要进行相应的修改

    其中check_disk主要是检查磁盘的未用空间。

    2、修改nagios主机上被监控主机的配置文件

[root@rhel5 ~]# cat /usr/local/nagios/etc/services.cfg define service{         use    generic-service         host_name oracle         service_description check-disk         check_command    check_nrpe!check_orcl         }

    3、修改被监控主机上的nrpe配置文件

[root@rhel5 ~]# cat /usr/local/nagios/etc/nrpe.cfgcommand[check_orcl]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/mapper/vg_orcl-orcl

[oracle@rhel5 orcl]$ df -h文件系统              容量  已用 可用 已用% 挂载点/dev/sda1             7.8G  3.4G  4.1G  46% /tmpfs                 355M  196M  159M  56% /dev/shm/dev/mapper/vg_orcl-orcl                       15G  8.4G  5.6G  60% /u01/dev/mapper/vg_mysql-mysql                      1.9G  576M  1.3G  32% /mysql

    查看一下页面：

 

    拷贝一些文件到/u01目录下，再df -h查看一下：

[oracle@rhel5 oradata]$ df -h文件系统              容量  已用 可用 已用% 挂载点/dev/sda1             7.8G  3.4G  4.1G  46% /tmpfs                 355M  196M  159M  56% /dev/shm/dev/mapper/vg_orcl-orcl                       15G   12G  3.0G  80% /u01/dev/mapper/vg_mysql-mysql                      1.9G  576M  1.3G  32% /mysql

    最后看一下页面：