Install and configure nagios

Nagios is an open-source monitoring solution. It can be used to monitor the status of linux, windows, and unix hosts and send alarms to users through text messages and emails. Another advantage is that it is an open-source solution that allows you to write monitoring scripts that you need in comparison. There are also a lot of off-the-shelf scripts available for reference on the Internet. In short, open source is free.

The installation process is as follows:

Version: rhel6.3 + nagios 4.0.2

ServerYou must install nagioscore, nagios nrpe, and nagios plugin software. The IP address is 10.4.1.11.

Windows ClientNSClient ++ needs to be installed

Linux ClientYou need to install nrpe and nagiosplugin.

Install and configure the nagios Monitoring Server

1. Configure the yum source and install related software packages.

Mount 10.1.1.11: // RHEL-INSTALL-REPO // nfsshare

[Root @ Stylog3 software] # mount 10.1.1.11:/RHEL-INSTALL-REPO // nfsshare

Vi/etc/yum. repos. d/rhel5.repo

[Server]

Name = rhel5server

Baseurl = file: // nfsshare/rhel-5.9-repo/install

Enable = 1

Gpcheck = 1

Gpgkey = file: // nfsshare/rhel-5.9-repo/install/RPM-GPG-KEY-redhat-release

Mkdir/nfsshare

Mount 10.1.1.11:/RHEL-INSTALL-REPO // nfsshare/

For convenience, you can directly use the httpd service provided by linux.

Yum install-y httpd php gcc glibcglibc-common gd-devel make net-snmp

2. Create a user

Useradd nagios

Passwd nagios

3. Compile and install nagios core

Tar-zxvf nagios-4.0.2

Cd nagios-4.0.2

./Configure

Make all

Make install

Make install-init

Make install-commandmode

Make install-config

4. Configure the web interface

Cd nagios-4.0.2

Make install-webconf

Create users for security purposes

Htpasswd-s-c/usr/local/nagios/etc/htpasswd. users nagiosadmin

Start http service

Service httpd start

5. Install nagios plugin

Tar-zxvf nagios-plugins-1.5.tar.gz

Cd nagios-plugins-1.5

./Configure

Make

Make install

6. Modify and verify the configuration file.

The configuration files are in the/usr/local/nagios/etc/directory.

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

7. log on to the website for verification. Is the installation correct?

Http: // Your-server-IP-address/nagios

8. For details about how to install the clinet client, see the following section.

You only need to add the relevant commands in the nrpe. cfg file. A corresponding command must be added for each service.

Cat/usr/local/nagios/etc/nrpe. cfg

Add the following similar content

Command [check_disk] =/usr/local/nagios/libexec/check_disk-w 15%-c 10%-p/home

Added a windows monitoring client.

1. install the software nscp

Installed in C: \ Program Files \ NSClient ++ by default. The configuration file is nsclient. ini, and the default monitoring port is 12489.

Install the windows monitoring plug-in on the server (check_nt is already installed by default)

2. Define commands

Vi/usr/local/nagios/etc/objects/commands. cfg

# 'Check _ nt 'command definition

Define command {

Command_name check_nt

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

}

3. Define the Project services to be monitored

Vi/usr/local/nagios/etc/objects/windows_stysql1.cfg

Vi/usr/local/nagios/etc/nagios. cfg

Export _file =/usr/local/nagios/etc/objects/windows_stysql1.cfg

Add a linux Server monitoring Client

1. Upload and install the nagios plugin installation software

Scp/monitor/software/nrpe-2.12.tar.gz hadoop @ stylog2:/monitor/software

Scp hadoop@10.1.1.5:/monitor/software/nagios-plugins-1.5.tar.gz/monitor/software/

Scp hadoop@10.1.1.5:/monitor/software/nrpe-2.12.tar.gz/monitor/software/

Tar-zxvf nagios-plugins-1.5.tar.gz

2. Configure the yum source and install related software packages.

Vi/etc/yum. repos. d/rhel6.repo

[Server]

Name = rhel6server

Baseurl = file: // nfsshare/rhel-6.3-repo/RHEL63/Server

Enable = 1

Gpcheck = 1

Gpgkey = file: // nfsshare/rhel-6.3-repo/RHEL63/RPM-GPG-KEY-redhat-release

Mkdir/nfsshare

Mount 10.1.1.11:/RHEL-INSTALL-REPO // nfsshare/

3. Create a user

Useradd nagios

Passwd nagios

4. Compile nagios plugin

[Root @ tydb nagios] # cd nagios-plugins-1.5

[Root @ tydb nagios] #./configure

[Root @ tydb nagios] # make

[Root @ tydb nagios] # make install

5. Modify permissions

Chown nagios: nagios/usr/local/nagios

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

6. Install xinetd.

Yum install xinetd

7. Install nrpe

Note:Checkingfor SSL headers... configure: error: Cannot find ssl headers

Yum-y install openssl-devel

Scphadoop @ stylog1:/monitor/software/nrpe-2.12.tar.gz/monitor/software/

Tar-xvf nrpe-2.12.tar.gz

Cd nrpe-2.12

[Root @ tydb] #./configure

[Root @ tydb] # make all

[Root @ tydb] # make install-plugin

[Root @ tydb] # make install-daemon

[Root @ tydb] # make install-daemon-config

Make install-xinetd

8. modify the configuration

Vi/etc/xinetd. d/nrpe

Only_from = 127.0.0.1 localhost <nagios_ip_address>

Vi/etc/services

Nrpe 5666/tcp NRPE

Restart service

Service xinetd restart

9. verify whether the installation is successful.

[Root @ stylog2 nrpe-2.12] # netstat-at | grep nrpe

Tcp 0 0 *: nrpe *: * LISTEN

[Root @ stylog2 nrpe-2.12] #/usr/local/nagios/libexec/check_nrpe-H localhost

NRPE v2.12

10. Add monitoring configurations.

Vi/usr/local/nagios/etc/nrpe. cfg

Added by default

Command [check_users] =/usr/local/nagios/libexec/check_users-w 5-c 10

Command [check_load] =/usr/local/nagios/libexec/check_load-w 15, 10, 5-c 30, 25, 20

Command [check_zombie_procs] =/usr/local/nagios/libexec/check_procs-w 5-c 10-s Z

Command [check_total_procs] =/usr/local/nagios/libexec/check_procs-w 1000-c 1500

# Command [check_ftp] =/usr/local/nagios/libexec/check_ftp-w 150-c 200

Command [check_ssh] =/usr/local/nagios/libexec/check_ssh10.1.1.5

Command [check_disk] =/usr/local/nagios/libexec/check_disk-w 15%-c 10%-p/

You can test whether the related commands can be executed normally.

/Usr/local/nagios/libexec/check_nrpe-Hlocalhost-c check_users

You can also add the command as needed.

11. The monitoring server also needs simple configuration

A. Make sure that nrpe and nrpe client are installed.

B. Check the connection to the newly added monitored server.

[Root @ stadmin ~] #/Usr/local/nagios/libexec/check_nrpe-H 10.1.1.6

NRPE v2.12

C. Add the hosts

Vi/usr/local/nagios/etc/hosts. cfg

Definehost {

Use linux-tydb2; Inherit default values from atemplate

Host_name stylog1; The name we're re giving tothis server

Alias stylog1; A longer name for the server

Address 10.1.1.5; IP address of Remote Linux host

}

Define host {

Use linux-tydb2; Inherit default values from atemplate

Host_name stylog2; The name we're re giving tothis server

Alias stylog2; A longer name for the server

Address 10.1.1.6; IP address of Remote Linux host

}

D. Create a service configuration file.

Vi service_linux.cfg

In this example, only one service is added. In fact, more metric item definitions may be required.

Define service {

Use generic-service

Host_name stylog2

Service_description FileSystem Usage

Check_command check_nrpe! Check_disk

}

E. Restart nagios.

Service nagios restart

Add a Metric

Added linux File System Monitoring

The default configuration file is in the/usr/local/nagios/etc directory.

A. Add the configuration file in nagios. cfg.

Export _file =/usr/local/nagios/etc/servicesi_linux.cfg

B. Add servicecheck_disk TO THE service_linux.cfg configuration file.

Define service {

Use generic-service

Host_name stylog1

Service_description File System Usage

Check_command check_nrpe! Check_disk

}

C. Add commands to the commands. cfg file of the client server.

Cat/usr/local/nagios/etc/objects/commands. cfg

# 'Check _ disk' command definition

Define command {

Command_name check_disk

Command_line $ USER1 $/check_disk-w $ ARG1 $-c $ ARG2 $-p $ ARG3 $

}

References

Http://www.tecmint.com/install-nagios-in-linux/

Http://www.tecmint.com/how-to-add-linux-host-to-nagios-monitoring-server/

Http://www.tecmint.com/how-to-add-windows-host-to-nagios-monitoring-server/