【Nagios】Linux监控软件安装与配置（二）

一、安装扩展源

[root@www ~]# rpm -ivh http://mirrors.yun-idc.com/epel/6/i386/epel-release-6-8.noarch.rpm

二、安装Nagios相关软件包

[root@www ~]# yum -y install httpd nagios nagios-plugins nagios-plugins-all nrpe nagios-plugins-nrpe

三、设置nagios后台登录用户名和密码

[root@www ~]# htpasswd -c /etc/nagios/passwd nagiosadmin  #这里指定用户名为nagiosadmin，而不是其他 New password:  Re-type new password:  Adding password for user nagiosadmin

四、检查Nagios配置

[root@www ~]# nagios -v /etc/nagios/nagios.cfg  Nagios Core 3.5.1 Copyright (c) 2009-2011 Nagios Core Development Team and Community Contributors Copyright (c) 1999-2009 Ethan Galstad Last Modified: 08-30-2013 License: GPL Website: http://www.nagios.org Reading configuration data...    Read main config file okay... Processing object config file '/etc/nagios/objects/commands.cfg'... Processing object config file '/etc/nagios/objects/contacts.cfg'... Processing object config file '/etc/nagios/objects/timeperiods.cfg'... Processing object config file '/etc/nagios/objects/templates.cfg'... Processing object config file '/etc/nagios/objects/localhost.cfg'... Processing object config directory '/etc/nagios/conf.d'...    Read object config files okay... Running pre-flight check on configuration data... Checking services...	Checked 8 services. Checking hosts...	Checked 1 hosts. Checking host groups...	Checked 1 host groups. Checking service groups...	Checked 0 service groups. Checking contacts...	Checked 1 contacts. Checking contact groups...	Checked 1 contact groups. Checking service escalations...	Checked 0 service escalations. Checking service dependencies...	Checked 0 service dependencies. Checking host escalations...	Checked 0 host escalations. Checking host dependencies...	Checked 0 host dependencies. Checking commands...	Checked 24 commands. Checking time periods...	Checked 5 time periods. Checking for circular paths between hosts... Checking for circular host and service dependencies... Checking global event handlers... Checking obsessive compulsive processor commands... Checking misc settings... Total Warnings: 0 Total Errors:   0 Things look okay - No serious problems were detected during the pre-flight check

五、启动Nagios和http服务

[root@www ~]# /etc/init.d/httpd start Starting httpd:                                            [  OK  ] [root@www ~]# /etc/init.d/nagios start Starting nagios: done.

六、浏览器访问

七、Nagios添加被监控客户端主机

1、安装Nagios服务

[root@sh ~]# rpm -ivh epel-release-6-8.noarch.rpm [root@sh ~]# yum -y install nagios-plugins nagios-plugins-all nrpe nagios-plugins-nrpe

2、修改/etc/nagios/nrpe.cfg文件

[root@sh ~]# vim /etc/nagios/nrpe.cfg

 81 allowed_hosts=127.0.0.1,192.168.1.21 #添加nagios服务端IP  97 dont_blame_nrpe=1   #0改为1

3、启动nrpe

[root@sh ~]# /etc/init.d/nrpe start Starting nrpe:                                             [  OK  ]

4、Nagios服务端添加被监控客户端主机

[root@www ~]# cd /etc/nagios/conf.d/ [root@www conf.d]# ls [root@www conf.d]# vim 192.168.1.251.cfg define host{         use                     linux-server         host_name           192.168.1.251         alias                       1.251         address                 192.168.1.251         } define service{         use                     generic-service         host_name               192.168.1.251         service_description     check_ping         check_command           check_ping!100.0,20%!200.0,50%         max_check_attempts 5         normal_check_interval 1 } define service{         use                     generic-service         host_name               192.168.1.251         service_description     check_ssh         check_command           check_ssh         max_check_attempts      5  #当nagios检测到问题时，一共尝试检测5次都有问题才会告警，如果该数值为1，那么检测到问题立即告警         normal_check_interval   1  #重新检测的时间间隔，单位是分钟，默认是3分钟         notification_interval   60 #在服务出现异常后，故障一直没有解决，nagios再次对使用者发出通知的时间。如果你认为，所有的事件只需要一次通知就够了，可以把这里的选项设为0 } define service{         use                     generic-service         host_name               192.168.1.251         service_description     check_http         check_command           check_http         max_check_attempts      5         normal_check_interval 1 }

5、检查配置

[root@www conf.d]# nagios -v /etc/nagios/nagios.cfg 

6、重启nagios

[root@www conf.d]# /etc/init.d/nagios restart Running configuration check...done. Stopping nagios: done. Starting nagios: done.

7、查看效果

八、添加nrpe支持的监控服务

1、添加nrpe服务

[root@www ~]# vim /etc/nagios/objects/commands.cfg  ################################################################################ # 'notify-host-by-email' command definition define command{         command_name    notify-host-by-email         command_line    /usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\nHost: $HO STNAME$\nState: $HOSTSTATE$\nAddress: $HOSTADDRESS$\nInfo: $HOSTOUTPUT$\n\nDate/Time: $LONGDATETIME$\n" | /bin/mail -s "** $NOTIFICATIONTYPE$ Host Alert: $HOSTNAME$ is $HOSTSTATE$ **" $CONTACTEMAIL$         } # 'notify-service-by-email' command definition define command{         command_name    notify-service-by-email         command_line    /usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\n\nService : $SERVICEDESC$\nHost: $HOSTALIAS$\nAddress: $HOSTADDRESS$\nState: $SERVICESTATE$\n\nDate/Time: $LONGDATETIME$\n\nAd ditional Info:\n\n$SERVICEOUTPUT$\n" | /bin/mail -s "** $NOTIFICATIONTYPE$ Service Alert: $HOSTALIAS$/$SERVICEDESC$ is $SERVICESTATE$ **" $CONTACTEMAIL$         } define command{         command_name    check_nrpe  #自定义check         command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$         } ################################################################################

2、添加nrpe服务脚本

[root@www ~]# vim /etc/nagios/conf.d/192.168.1.251.cfg ...... #check_nrpe define service{         use     generic-service         host_name       192.168.1.251         service_description     check_load  #监控负载         check_command           check_nrpe!check_load         max_check_attempts 5         normal_check_interval 1 } define service{         use     generic-service         host_name       192.168.1.251         service_description     check_disk_sda1         check_command           check_nrpe!check_hda1  #check_nrpe为前面自定义的模块名称，check_hda1为被监控主机/etc/nagios/nrpe.cfg文件里定义的脚本名称         max_check_attempts 5         normal_check_interval 1 } #define service{    #可以添加多块磁盘监控 #        use     generic-service #        host_name       192.168.1.251 #        service_description     check_disk_hda2 #        check_command           check_nrpe!check_hda2 #        max_check_attempts 5 #        normal_check_interval 1 #}

[root@www ~]# nagios -v /etc/nagios/nagios.cfg  ....... Total Warnings: 0 Total Errors:   0 Things look okay - No serious problems were detected during the pre-flight check

3、被监控主机通过nrpe.cfg文件定义的脚本命令

[root@sh ~]# vim /etc/nagios/nrpe.cfg # The following examples use hardcoded command arguments... command[check_users]=/usr/lib64/nagios/plugins/check_users -w 5 -c 10 command[check_load]=/usr/lib64/nagios/plugins/check_load -w 15,10,5 -c 30,25,20 command[check_hda1]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p /dev/sda1 #command[check_hda2]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p /dev/hda2 command[check_zombie_procs]=/usr/lib64/nagios/plugins/check_procs -w 5 -c 10 -s Z command[check_total_procs]=/usr/lib64/nagios/plugins/check_procs -w 150 -c 200

4、重启服务

[root@www ~]# /etc/init.d/nagios restart Running configuration check...done. Stopping nagios: done. Starting nagios: done.

[root@sh ~]# /etc/init.d/nrpe restart Shutting down nrpe:                                        [  OK  ] Starting nrpe:                                             [  OK  ]

5、web页面查看结果

6、查看nagios日志文件

[root@www ~]# ls /var/log/nagios/ archives  nagios.log  objects.cache  retention.dat  spool  status.dat

[root@www ~]# cat /var/log/nagios/nagios.log  [1449405095] Nagios 3.5.1 starting... (PID=1319) [1449405095] Local time is Sun Dec 06 20:31:35 CST 2015 [1449405095] LOG VERSION: 2.0 [1449405095] Finished daemonizing... (New PID=1320) [1449405217] SERVICE ALERT: localhost;HTTP;WARNING;SOFT;1;HTTP WARNING: HTTP/1.1 403 Forbidden - 5159 bytes in 0.001 second response time [1449405277] SERVICE ALERT: localhost;HTTP;WARNING;SOFT;2;HTTP WARNING: HTTP/1.1 403 Forbidden - 5159 bytes in 0.001 second response time [1449405337] SERVICE ALERT: localhost;HTTP;WARNING;SOFT;3;HTTP WARNING: HTTP/1.1 403 Forbidden - 5159 bytes in 0.001 second response time [1449405397] SERVICE ALERT: localhost;HTTP;WARNING;HARD;4;HTTP WARNING: HTTP/1.1 403 Forbidden - 5159 bytes in 0.001 second response time [1449405683] Caught SIGTERM, shutting down... [1449405683] Successfully shutdown... (PID=1320) [1449405684] Nagios 3.5.1 starting... (PID=1474) [1449405684] Local time is Sun Dec 06 20:41:24 CST 2015 [1449405684] LOG VERSION: 2.0 [1449405684] Finished daemonizing... (New PID=1475) [1449408863] Caught SIGTERM, shutting down... [1449408863] Successfully shutdown... (PID=1475) [1449408863] Nagios 3.5.1 starting... (PID=1833) [1449408863] Local time is Sun Dec 06 21:34:23 CST 2015 [1449408863] LOG VERSION: 2.0 [1449408863] Finished daemonizing... (New PID=1834) [1449408913] SERVICE ALERT: 192.168.1.251;check_http;CRITICAL;SOFT;1;connect to address 192.168.1.251 and port 80: Connection refused [1449409033] SERVICE ALERT: 192.168.1.251;check_http;CRITICAL;SOFT;2;connect to address 192.168.1.251 and port 80: Connection refused [1449409153] SERVICE ALERT: 192.168.1.251;check_http;CRITICAL;SOFT;3;connect to address 192.168.1.251 and port 80: Connection refused [1449409273] SERVICE ALERT: 192.168.1.251;check_http;CRITICAL;SOFT;4;connect to address 192.168.1.251 and port 80: Connection refused [1449409393] SERVICE ALERT: 192.168.1.251;check_http;CRITICAL;HARD;5;connect to address 192.168.1.251 and port 80: Connection refused [1449409393] SERVICE NOTIFICATION: nagiosadmin;192.168.1.251;check_http;CRITICAL;notify-service-by-email;connect to address 192.168.1.251 and port 80: Connection refused [1449410874] Caught SIGTERM, shutting down... [1449410874] Successfully shutdown... (PID=1834) [1449410874] Nagios 3.5.1 starting... (PID=2330) [1449410874] Local time is Sun Dec 06 22:07:54 CST 2015 [1449410874] LOG VERSION: 2.0 [1449410874] Finished daemonizing... (New PID=2331) [1449411134] SERVICE ALERT: 192.168.1.251;check_http;OK;HARD;5;HTTP OK: HTTP/1.1 200 OK - 3910 bytes in 0.001 second response time [1449411134] SERVICE NOTIFICATION: nagiosadmin;192.168.1.251;check_http;OK;notify-service-by-email;HTTP OK: HTTP/1.1 200 OK - 3910 bytes in 0.001 second response time [1449411714] Caught SIGTERM, shutting down... [1449411714] Successfully shutdown... (PID=2331) [1449411714] Nagios 3.5.1 starting... (PID=2614) [1449411714] Local time is Sun Dec 06 22:21:54 CST 2015 [1449411714] LOG VERSION: 2.0 [1449411714] Finished daemonizing... (New PID=2615)

九、Nagios配置邮件警告

1、增加define contact和define contactgroup配置

[root@www ~]# vim /etc/nagios/objects/contacts.cfg  # We only have one contact in this simple configuration file, so there is # no need to create more than one contact group. define contactgroup{         contactgroup_name       admins         alias                   Nagios Administrators         members                 nagiosadmin         } # add mail addressee define contact{         contact_name               admin         use                             generic-contact         alias                           administrator         email              741616710@qq.com         } define contact{         contact_name               ming         use                             generic-contact         alias                            HM         email              root@huangmingming.cn         } define contactgroup{         contactgroup_name          common         alias                            common         members                          admin,ming         }

2、修改define service，增加相应配置

[root@www ~]# vim /etc/nagios/conf.d/192.168.1.251.cfg

    define service{

            use                     generic-service

            host_name               192.168.1.251

            service_description     check_http

            check_command           check_http

            max_check_attempts      5

            normal_check_interval   1

            contact_groups        common

            notifications_enabled   1

            notification_period   24x7

            notification_options w,u,c,r

    }  

[root@www ~]# nagios -v /etc/nagios/nagios.cfg