Install Nagios monitoring server and client

Nagios is a monitoring system that monitors system running status and network information. Nagios can monitor specified local or remote hosts and services, and provide exception notification functions. Nagios can run on Linux/Unix platforms, at the same time, an optional browser-based WEB interface is provided to facilitate system administrators to view the network status, various system problems, and logs.

I. MAIN FEATURES OF Nagios:

• Monitoring Network Services (SMTP, POP3, HTTP, NNTP, PING, etc)
• Monitor host resources (processes, disks, etc)
• The monitoring function of Nagios can be easily expanded with Simple plug-in design.
• Concurrent processing of services and other monitoring

Prepare the software package:

• Nagios Core nagios-3.2.2.tar.gz
• Nagios Plugins nagios-plugins-1.4.15.tar.gz
• Nagios Addons nrpe-2.12.tar.gz

Ii. Server Installation

1. View the Server installation environment (LAMP)
2. # Rpm-qa | grephttpd
3. # Rpm-qa | grepphp
4. If not, install
5. # Yum-yinstallgccglibcglibc-commongdgd-develphpopenssl-develhttpd
6. Create a user:
7. # Useradd-m-s/bin/bashnagios
8. # Groupaddnagios
9. # Usermod-Gnagiosnagios
10. # Vi/etc/passwd
11. Nagios: x: 500: 500:/home/nagios:/sbin/nologin
12. Changed:
13. Nagios: x: 500: 500:/home/nagios:/bin/bash
14. Create a user group named nagcmd to execute External commands from the Web interface. Add both nagios users and apache users to this group.
15. Because the CGI Web monitoring panel is used, we need to add a nagcmd group for CGI to execute related commands.
16. #/Usr/sbin/groupaddnagcmd
17. #/Usr/sbin/usermod-Gnagcmdnagios
18. #/Usr/sbin/usermod-a-gnag1_daemon (because apache is compiled and installed, it is run by the daemon user by default)

Download the related software packages. The server needs to install the following three packages. The client only needs to install the last two plug-in packages:

1. [Root @ server ~] # Cd/usr/local/src/tarbag/
2. [Root @ servertarbag] # wgethttp: // prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.2.2.tar.gz
3. [Root @ servertarbag] # wgethttp: // prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.15.tar.gz
4. [Root @ servertarbag] # wgethttp: // prdownloads.sourceforge.net/sourceforge/nagios/nrpe-2.12.tar.gz

Decompress and compile and install Nagios:

1. #Tarxvzfnagios-3.2.2.tar.gz
2. # Cdnagios-3.2.2

Run the Nagios configuration script and use the previously opened users and user groups:

1. #./Configure -- prefix =/usr/local/nagios -- with-command-group = nagcmd

Compile the Nagios package source code:

1. # Makeall

Install the binary program, initialize the script, configure the file sample, and set the running directory permissions:

1. # Makeinstall
2. # Makeinstall-init // install the startup script in/etc/rc. d/init. d.
3. # Makeinstall-config // install the sample configuration file. The installation path is/usr/local/nagios/etc.
4. # Makeinstall-commandmode // configure Directory Permissions
5. # Ls/usr/local/nagios/
6. Binetclibexecsbinsharevar

3. Configure nagios

The configuration file of the sample is installed in the directory/usr/local/nagios/etc by default. You can configure Nagios to run the sample file properly. You only need to make a simple modification... use the editor software you are good at to edit this/usr/local/nagios/etc/objects/contacts. in the cfg configuration file, change the email information in the contact definition information of the e-mail address nagiosadmin to your EMail information to receive alerts.

1. Vi/usr/local/nagios/etc/objects/contacts. cfg

1. Install the nagios plugin

1. # Cd ../
2. #Tarzxvfnagios-plugins-1.4.16.tar.gz
3. # Cdnagios-plugins-1.4.16
4. #./Configure -- with-nagios-user = nagios -- with-nagios-group = nagios -- prefix =/usr/local/nagios // specify the installation directory and users and groups
5. # Make; makeinstall
6. Configure httpd
7. Generate the Apache configuration file for Nagios
8. # Cdnagios-3.2.2
9. # Makeinstall-webconf
10. /Usr/bin/install-c-m644sample-config/httpd. conf/etc/httpd/conf. d/nagios. conf
11. # Cdsample-config
12. Add sample-config/httpd. conf to the httpd. conf configuration file of Apache.
13. Create a nagiosadmin user for logging on to the Apache interface of Nagios. Write down the logon password you set and you will use it later.
14. #./Htpasswd-c/usr/local/nagios/etc/htpasswd. usersnagiosadmin
15. Password: nagiosmonitor
16. Restart the Apache service to make the settings take effect.
17. Install the NRPE plug-in. To obtain more detailed information on the client, you must also install the NRPE plug-in on the server and client.
18. # Cd ..
19. #Tarzxvfnrpe-2.14.tar.gz
20. # Cdnrpe-2.14
21. #./Configure -- with-nagios-user = nagios -- with-nagios-group = nagios -- prefix =/usr/local/nagios/
22. # Makeall
23. # Makeinstall-plugin; makeinstall-daemon-config
24. # Ls/usr/local/nagios/libexec/
25. Check_aptcheck_ftpcheck_mailqcheck_overcrcheck_tcp .......
26. Verify the Nagios sample configuration file
27. #/Usr/local/nagios/bin/nagios-v/usr/local/nagios/etc/nagios. cfg
28. If no error is reported, you can start the Nagios service.
29. Start and verify the httpd and nagios services
30. # Chkconfig -- addnagios // set nagios and http to boot automatically
31. # Chkconfignagioson
32. # Chkconfighttpdon
33. # Servicenagiosstart
34. # Servicehttpdstart

2. Client installation

1. # Useradd-s/sbin/nologinnagios // Add a nagios user
2. Install nagios-plugins
3. #Tar-zxvfnagios-plugins-1.4.15.tar.gz
4. # Cdnagios-plugins-1.4.15
5. #./Configure -- prefix =/usr/local/nagios
6. # Make
7. # Makeinstall
8. # Chownnagios. nagios/usr/local/nagios/
9. # Chown-Rnagios.nagios/usr/local/nagios/libexec/
10. Install the nrpe plug-in
11. #Tar-zxvfnrpe-2.12.tar.gz
12. # Cdnrpe-2.12
13. #./Configure -- prefix =/usr/local/nagios/
14. # Makeall
15. # Makeinstall-plugin install the check_nrpe plugin
16. # Makeinstall-daemon install daemon
17. # Makeinstall-daemon-config
18. If an error is reported during installation: checkingforSSLheaders... configure: error: Cannotfindsslheaders
19. # Rpm-qa | grepopenssl
20. Openssl-devel-0.9.8e-12.el5_4.6
21. Openssl-0.9.8e-12.el5_4.6
22. Yuminstallopenssl-devel
23. Or download: http://www.openssl.org/source/
24. Tarzxvfopenssl-1.0.0a.tar.gz
25. Cdopenssl-1.0.0a
26. ./Config
27. Make
28. Maketest
29. Makeinstall
30. Modify the client configuration file
31. Vi/usr/local/nagios/etc/nrpe. cfg
32. Server_port: 5666
33. Allowed_hosts = 127.0.0.1, 192.168.1.95 // Add a server IP Address
34. Specify the nagios monitoring host ip address. Multiple ip addresses are separated by commas (,). The following ip address is the ip address of the nagios server. That is to say, only the specified ip address can be used to obtain information about the local machine through the port 5666 opened by nrpe.
35. Modify the command section in nrpe. cfg.
36. Start the NRPE daemon: (you can add this command to/etc/rc. local for Automatic startup)
37. #/Usr/local/nagios/bin/nrpe-c/usr/local/nagios/etc/nrpe. cfg-d
38. You can add this command to/etc/rc. local to enable automatic startup upon startup.
39. Echo "/usr/local/nagios/bin/nrpe-c/usr/local/nagios/etc/nrpe. cfg-d">/etc/rc. local
40. # Netstat-utpln | grepnrpe // check whether the nrpe process has started properly
41. #/Usr/local/nagios/libexec/check_nrpe-H127.0.0.1NRPEv2.14 // nrpe test results, the result is nrpe has been working properly
42. Then test on the nagios Monitoring Server
43. #/Usr/local/nagios/libexec/check_nrpe-H192.168.1.77 // ip address of the monitored host
44. Return information about the NRPE version installed on the monitored server: NRPEv2.12

3. Define monitoring content

1. # Vi/usr/local/nagios/etc/nrpe. cfg // define monitoring server content
2. Command [check_users] =/usr/local/nagios/libexec/check_users-w5-c10 # monitor the number of login users
3. Command [check_load] =/usr/local/nagios/libexec/check_load-w15, 10, 5-c30, 25, 20 # monitor CPU load
4. Command [check_sda2] =/usr/local/nagios/libexec/check_disk-w20 %-c10 %-p/dev/sda2 # monitor disk utilization, where sda2 must be the actual hard disk partition, you can use fdisk-l to query
5. Command [check_swap] =/usr/local/nagios/libexec/check_swap-w20-c10 # monitor swap space command [check_zombie_procs] =/usr/local/nagios/libexec/check_procs-w5-c10-sZ # monitor botnets in the process
6. Command [check_total_procs] =/usr/local/nagios/libexec/check_procs-w150-c200 # monitor all processes
7. Note: The content in the brackets after the command is the defined variable. The variable name can be specified at will. It only needs to be consistent with that in the server configuration file.