Nagios: installation and configuration

Nagios: installation and configuration

Unix/linux monitoring software

Nagios

Nagios is an open-source free network monitoring tool that can effectively monitor the status of Windows, Linux, and Unix hosts, vswitches, routers, and other network settings,

Printers, etc.

Cacti

Cacti is a set of graphic analysis tools for network traffic monitoring developed based on PHP, MySQL, SNMP, and RRDTool.

Zabix

Zabbix?Bix) is an enterprise-level open source solution that provides distributed system monitoring and network monitoring functions based on the WEB interface.

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Install and configure nagios

Zlib, libpng, ligjpeg, gd, php, apache (httpd)/nginx must be installed.

Installation:

Nagios-core

Nagios-plugins

Nagios-frontends (Monitoring clients with different themes)

Nagios-addons (including nrpe and nsclient ++)

Nrpe: Remote Control on linux/unix

Nsclient ++: Remote Control client on windows

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Install nagios-core

Create a nagios user and group and modify permissions at the same time

Groupadd nagios

Useradd-s/bin/false-g nagios

Useradd-s/bin/false-g nagios nagioscmd

./Configure -- with-command-user = nagioscmd

Install to/usr/local/Nagios/

Make devclean

./Configure -- with-gd-lib =/usr/lib -- with-gd-inc =/usr/include/-- with-command-user = nagioscmd

Make all

Make install

Make install-init

Make install-commandmode

Make install-config

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Install the nagios-plugin plug-in:

Nagios itself cannot monitor the system information of the local machine. You need to install this plug-in:

Compile and install the nagios plugin nagios-plugins.

Plug-ins in/usr/local/Nagios/libexec/

./Configure

Make

Make install

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After nagios configuration is complete, you need to configure apache:

Generate password:

Sudohtpasswd-c/usr/local/nagios/etc/htpasswd. users nagiosadmin

This can be used in the httpd. conf file:

CdNagios-XXX

Makeinstall-webconf

Modify the following configuration file:

/Etc/apache2/apache2.conf or/usr/local/conf/httpd. conf

ScriptAlias/nagios/cgi-bin "/usr/local/nagios/sbin"

<Directory "/usr/local/nagios/sbin">

Options ExecCGI

Order allow, deny

Allow from all

AuthName "Nagios Access"

AuthType Basic

AuthUserFile/usr/local/nagios/etc/htpasswd. users

Require valid-user

</Directory>

Alias/nagios "/usr/local/nagios/share"

<Directory "/usr/local/nagios/share">

Options None

AllowOverride None

Order allow, deny

Allow from all

AuthName "Nagios Access"

AuthType Basic

AuthUserFile/usr/local/nagios/etc/htpasswd. users

Require valid-user

</Directory>

After configuration, You need to reload apache2:

Sudo service apache2 reload

Check nagios Configuration:

Sudo/usr/local/nagios/bin/nagios-v/usr/local/nagios/etc/nagios. cfg

Start nagios:

Sudoservice Nagios start

Test on the web page:

Http: // localhost/nagios/

Enter nagiosadmin and password

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Nagios can only monitor the system information of the Local Machine (cpu, disk, memory, etc.), and uses nrpe for remote monitoring.

Nrpe is divided into two parts:

Check_nrpe, running on the monitoring host

NRPE daemon runs on the monitored host.

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To be monitored (remote machines), you need to install the following content ):

Add a nagios User:

Useradd-s/sbin/nologin nagios

Passwd nagios

Install the nagios Plugin:

./Configure

Make

Make install

Modify directory permissions:

Chown-R nagios: nagios/usr/local/nagios

Install nrpe deamon:

./Configure

Make all

Make install-daemon

Make install-daemon-config

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Install and Configure xinetd (the default system has been installed ):

Make install-xinetd

Configure the/etc/xinetd. d/nrpe file to add the monitoring host ip Address:

Only_from = ip address # Add the address of the monitoring host here.

Add the nrpe service to the/etc/services file:

Nrpe 5666/tcp # nrpe

Restart xinetd:

Service xinetd restart

The returned nrpe version number is correct:

/Usr/local/nagios/libexec/check_nrpe-H localhost

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Configure the/usr/local/nagios/etc/nrpe. cfg file for nrpe:

This file checks the user, cpu load, hda1 capacity, zombie process, and total process.

Check_users, check_load, check_hda1, check_zombie_procs, and check_total_procs.

Information about swap to be added:

Command [check_swap] =/usr/local/nagios/libexec/check_swap-w 20%-c 10%

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To monitor remote machine system information, you need to install check_nrpe on the monitoring machine:

Install check_nrpe:

./Configure

Makeall

Makeinstall-plugin

If the nrpedaemon of the monitored machine is installed, the version information returned by the test is correct:

/Usr/local/Nagios/libexec/check_nrpe-H remote_ip

Add check_nrpe in/usr/local/nagios/etc/objects/commands. cfg:

Define command {

Command_name check_nrpe

Command_line/usr/local/nagios/libexec/check_nrpe-H $ HOSTADDRESS $-c $ ARG1 $ # You can also replace the path with $ USER1 $.

Add five monitoring services in/usr/local/nagios/etc/objects/services. cfg:

Define service {

Host_name ip # Add the ip address of the remote machine, which must be defined in hosts. cfg

Service_description service-name # service name

Check_command check_nrpe \

! Check_users/check_load/check_hda1/check_zombie_procs/check_total_procs/check_swap # define these services in the same way.

}

Restart nagios to monitor remote unix/linux machines.

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The following three methods are available for nagios to monitor remote windows machines:

Nrpe

Check_NT

NSCP (NSClient ++) (use this now)

Nrpe is divided into two parts:

1. Check_nrpe, running on the monitoring host

2. NRPE daemon runs on the monitored host.

Check_NT:

This plug-in is the simplest. You only need to install it on the monitoring machine and connect to the remote machine through the network protocol.

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Install NSCP on the monitored windows machine:

In cmd:

Cd C: \ NSClient

Nsclient ++/install

Nsclient ++ SysTray

Open service. msc to check whether the nsclient has been started.

Service. msc-> NSClientpp-> login-> allow services to interact with the Desktop

Modify the configuration file C: \ NSClient \ NSC. ini:

Remove the comments before all modules in the [modules] section except CheckWMI. dlland RemoteConfiguration. dll.

In the [Settings] section, set the 'Password' option to set the password, which is required when nagios is connected. This step is optional and is convenient for me.

Skip it. Do not use a password.

Remove the comment of the 'allowed _ hosts' option in the [Settings] section, and add the IP address of the monitoring host running nagios. I will change it to the following

Example: allowed_hosts = 127.0.0.1/32,192.168 .0.111 is separated by commas (,). This field supports subnets. If it is written as 192.168.0.0/24, it indicates that

Can be accessed by all hosts. If this field is blank, all hosts can be connected. Note that [Settings] is part of [NSClient].

This option is also available in some cases.

Ensure that the 'Port' option of [NSClient] is not commented out and its value is '123456'. This is the default listening port of NSClient.

Restart:

Nsclient ++/start

Add a port to the firewall:

Windows Firewall-> enable

Windows Firewall-> exception-> Add port-> NSClient ++ 12489

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Install and configure NSCP on the monitoring machine:

1. check_nt has been installed by default

2. Define commands

Define command {

Command_name check_nt

Command_line $ USER1 $/check_nt-H $ HOSTADDRESS $-p 12489-v $ ARG1 $ ARG2 $

}

Test NSClient:

/Usr/local/Nagios/libexec/check_nt-H remote_ip-p 12489-v CLIENTVERSION

Test the connectivity of a windows Server:

/Usr/local/nagios/libexec/check_ping-H remote_ip-p 12489-s password-w 200.0, 20%-c 500.0, 60%

Add five monitoring services to the Monitoring Project/usr/local/Nagios/etc/objects/services. cfg:

Define service {

Host_name ip # Add the ip address of the remote machine, which must be defined in hosts. cfg

Service_description service-name # service name

Check_command check_nt \

! UPTIME \ CPULOAD \ MEMUSE \ USEDDISKSPACE \ SERVICESTATE \ PROCSTATE # define these services in the same way.

}

Restart nagios to monitor remote windows machines.

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