金鱼哥RHCA回忆录：RH236使用Nagios监控Red Hat Gluster存储

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原理是安装一台Nagios的服务器，服务端通过NRPE组件与被监控端交互，glusterfs已自带安装了NRPE组件，只要基本配置下即可：

安装nagios服务器

环境只提供了rhel6的安装包，所以要提前安装一台rhel6机器，并且安装监控glusterfs的相关插件：

yum源：rhs-nagios-3-for-rhel-6-server-rpms

# yum install nagios-server-addons

配置所有gluster节点

添加nrpe服务允许访问的IP：
# vim /etc/nagios/nrpe.cfg 
allowed_hosts=127.0.0.1,nagios-server-ip 
重启nrpe及glusterpmd服务：
# systemctl restart nrpe 
# systemctl restart glusterpmd 

在nagios服务器配置监控

# configure-gluster-nagios -c cluster-name -H HostName-or-IPaddress 
#只需指定一个gluster集群中的一台机器，其它机器自动添加

打开nagios图形

https://nagios-server-ip/nagios
默认账号密码都为：nagiosadmin

开启报警

打开host报警，services报警同理

点击红框内的链接，进入节点配置：

点击“Enablenotificationforallserviceonthishost”，开启服务通知选项。

点击commit完成设置

邮件报警

# vim /etc/nagios/gluster/gluster-contacts.cfg 
修改contact_name,alias,email，定义联系人或联系人组
define contact { #定义联系人 
contact_name                 Contact1               #联系人名称 
alias                          contack1               #别名 
email                         test@example.com      #邮箱 
service_notification_period    24x7                    #服务报警时间 
service_notification_options    w,u,c,r                  #服务报警选项，服务处于什么状态才报警 
service_notification_commands notify-service-by-email  #服务报警方式 
服务状态有多种：w:警告(warning)、u:未知(unkown)、c:严重(critical)、r:恢复(recover)、f:闪断(flapping)、s:计划内宕机(scheduled downtime events)

设置主机报警配置：
define hosts { 
host_notification_period              24x7 
host_notification_options             d,u,r 
host_notification_commands          notify-host-to-ovirt 
can_submit_commands               1 
_ovirt_rest_api                        http://ovirt.com:8080/ovirt-engine/api 
_ovirt_user                           admin@internal 
} 
主机状态也有多种：d:宕机(down)、u:主机不能到达(unreachable)、r:恢复（recover）、f:闪断(flapping)、s:计划内宕机(scheduled downtime events)
define contactgroup{                        #定义联系人组 
contactgroup_name       Group1           #组名 
alias                      GroupAlias        #别名 
members                 Contact1,Contact2 #组成员 
} 
PS：组设置有模板，请参考/etc/nagios/objects/contacts.cfg

# vim /etc/nagios/gluster/gluster-templates.cfg
#在模板中定义
#在指定主机或服务定义中，指定联系人或联系人组，此主机或服务的所有报警都会发给这个联系人或联系人组
define host{
 name                  gluster-generic-host
 use                    linux-server notifications_enabled 1
 notification_period     24x7
 notification_interval    120
 notification_options    d,u,r,f,s
 register                0
 contact_groups         Group1 #添加联系人组 
contacts                user1,user2 #添加联系人
} 
define host{
   name                         gluster-generic-host
   use                          linux-server
   notifications_enabled        1
   notification_period          24x7
   notification_interval        120
   notification_options         d,u,r,f,s
   register                     0
   contacts                     +snmp, Contact1
}
define service {
   name                         gluster-service
   use                          generic-service
   notifications_enabled       1
   notification_period          24x7
   notification_options         w,u,c,r,f,s
   notification_interval        120
   register                     0
   contacts                     +snmp, Contact1
   _gluster_entity              Service
}

重启服务

# service nagios restart

课本练习（以练习来进行了解）

[root@workstation ~]# lab rhsc-nagios setup

1. 配置servera防火墙规则。

[root@servera ~]# firewall-cmd --permanent --add-port=5666/tcp
success
[root@servera ~]# firewall-cmd --reload 
success

2. 配置serverb防火墙规则。

[root@serverb ~]# firewall-cmd --permanent --add-port=5666/tcp
success
[root@serverb ~]#  firewall-cmd --reload
success

3. 配置servera和serverb以允许对NRPE的访问。

# vim /etc/nagios/nrpe.cfg

# ALLOWED HOST ADDRESSES
# This is an optional comma-delimited list of IP address or hostnames 
# that are allowed to talk to the NRPE daemon. Network addresses with a bit mask
# (i.e. 192.168.1.0/24) are also supported. Hostname wildcards are not currently 
# supported.
#
# Note: The daemon only does rudimentary checking of the client's IP
# address.  I would highly recommend adding entries in your /etc/hosts.allow
# file to allow only the specified host to connect to the port
# you are running this daemon on.
#
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

allowed_hosts=127.0.0.1,manager.lab.example.com


# systemctl restart nrpe

4. 配置nagios以监视gluster-cluster。

[root@manager ~]# configure-gluster-nagios -c gluster-cluster -H servera.lab.example.com
Cluster configurations changed

Changes :
Hostgroup gluster-cluster - ADD
Host gluster-cluster - ADD
	 Service - Volume Utilization - prod-vol -ADD 
	 Service - Volume Split-brain status - prod-vol -ADD 
	 Service - Volume Status - prod-vol -ADD 
	 Service - Cluster Utilization -ADD 
	 Service - Cluster - Quorum Status -ADD 
	 Service - Cluster Auto Config -ADD 
Host servera.lab.example.com - ADD
	 Service - Brick Utilization - /bricks/brick-a1/brick -ADD 
	 Service - Brick - /bricks/brick-a1/brick -ADD 
Host serverb.lab.example.com - ADD
	 Service - Brick Utilization - /bricks/brick-b1/brick -ADD 
	 Service - Brick - /bricks/brick-b1/brick -ADD 
Are you sure, you want to commit the changes? (Yes, No) [Yes]: 
Enter Nagios server address [manager.lab.example.com]: 
Cluster configurations synced successfully from host servera.lab.example.com
Do you want to restart Nagios to start monitoring newly discovered entities? (Yes, No) [Yes]: 
Nagios re-started successfully

5. 验证Nagios配置。

[root@manager ~]# 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
…………
Total Warnings: 13
Total Errors:   0

Things look okay - No serious problems were detected during the pre-flight check

6. 配置nagios将glusterd的电子邮件通知发送给student用户。

[root@manager ~]# vim /etc/nagios/gluster/gluster-contacts.cfg
define contact {
       contact_name                  student
       alias                         student
       email                         student@manager.lab.example.com
       service_notification_period   24x7
       service_notification_options  w,u,c,r,f,s
       service_notification_commands notify-service-by-email
       host_notification_period      24x7
       host_notification_options     d,u,r,f,s
       host_notification_commands    notify-host-by-email
}
[root@manager ~]# vim /etc/nagios/gluster/gluster-templates.cfg
define host{
   name                         gluster-generic-host
   use                          linux-server
   notifications_enabled        1
   notification_period          24x7
   notification_interval        120
   notification_options         d,u,r,f,s
   register                     0
   contacts                     +snmp,student
}
define service {
   name                         gluster-service
   use                          generic-service
   notifications_enabled       1
   notification_period          24x7
   notification_options         w,u,c,r,f,s
   notification_interval        120
   register                     0
   contacts                     +snmp,student
   _gluster_entity              Service
}

添加配置用于通过电子邮件的通知服务和通过电子邮件的通知主机
[root@manager ~]# cat /etc/nagios/objects/commands.cfg （在 | /bin/mail -s 前添加）
$NOTIFICATIONCOMMENT$\n
$NOTIFICATIONCOMMENT$\n

[root@manager ~]# service nagios restart

7. 配置MTA以侦听远程连接。

[root@manager ~]# cat /etc/mail/sendmail.mc
dnl # The following causes sendmail to only listen on the IPv4 loopback address
dnl # 127.0.0.1 and not on any other network devices. Remove the loopback
dnl # address restriction to accept email from the internet or intranet.
dnl # DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
dnl #

[root@manager ~]# chkconfig sendmail on
[root@manager ~]# service sendmail restart

可去图形界面手动再点击启用告警通知，具体可看课程笔记。
可进行邮件发送测试：
[root@manager ~]# echo test |mail -s test student@manager.lab.example.com

按课本要求对serverb进行关机后，可收到邮件
[student@manager ~]$ mail
Heirloom Mail version 12.4 7/29/08.  Type ? for help.
"/var/spool/mail/student": 10 messages 4 unread
    1 nagios@manager.lab.e  Mon Dec 14 16:28  35/1149  "** PROBLEM Service Alert: gluster-cluster/Cl"
>U  2 nagios@manager.lab.e  Mon Dec 14 16:28  35/1148  "** PROBLEM Service Alert: gluster-cluster/Cl"
 U  3 nagios@manager.lab.e  Mon Dec 14 16:28  36/1161  "** PROBLEM Service Alert: servera.lab.exampl"
 U  4 nagios@manager.lab.e  Mon Dec 14 16:28  36/1161  "** PROBLEM Service Alert: serverb.lab.exampl"
 U  5 root                  Mon Dec 14 16:32  21/829   "test"
    6 nagios@manager.lab.e  Mon Dec 14 16:45  30/1111  "** PROBLEM Host Alert: serverb.lab.example.c"
& 6
Message  6:
From nagios@manager.lab.example.com  Mon Dec 14 16:45:32 2020
Return-Path: <nagios@manager.lab.example.com>
From: nagios@manager.lab.example.com
Date: Mon, 14 Dec 2020 16:45:32 +0800
To: student@manager.lab.example.com
Subject: ** PROBLEM Host Alert: serverb.lab.example.com is DOWN **
User-Agent: Heirloom mailx 12.4 7/29/08
Content-Type: text/plain; charset=us-ascii
Status: RO

***** Nagios *****

Notification Type: PROBLEM
Host: serverb.lab.example.com
State: DOWN
Address: serverb.lab.example.com
Info: CRITICAL: NRPE service on the host is down or not responding

Date/Time: Mon Dec 14 16:45:32 CST 2020

8. 脚本评分。

[root@workstation ~]# lab rhsc-nagios grade

总结

RHCA认证需要经历5门的学习与考试，还是需要花不少时间去学习与备考的，好好加油，可以噶🤪。

以上就是【金鱼哥】对 第十四章 使用Nagios监控Red Hat Gluster存储 的简述和讲解。希望能对看到此文章的小伙伴有所帮助。

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