Shulou(Shulou.com)06/01 Report--

The purpose of this article is to share with you about how RHEL4U5 builds the network inspection service SNMP. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

The system used is RHEL4U5, and the native IP address is 192.168.1.100

1. Make sure that the following software packages are installed on your system

[root@zone src] # rpm-qa | grep snmp

Net-snmp-5.1.2-11.EL4.10

Net-snmp-utils-5.1.2-11.EL4.10

Net-snmp-devel-5.1.2-11.EL4.10

Net-snmp-libs-5.1.2-11.EL4.10

Note that the system may prompt you to install

Beecrypt-devel-3.1.0-6.i386.rpm

Elfutils-devel-0.97.1-4.i386.rpm

Elfutils-libelf-devel-0.97.1-4.i386.rpm

These documents are on the second and fourth disks, respectively.

two。 Modify / etc/snmp/snmpd.conf

Remove the comments from the following line

View mib2 included .iso.org.dod.internet.mgmt.mib-2 fc

Add the following line at about 55 lines

View systemview included .1.3.6.1.2.1.2

Such as the following line

Access notConfigGroup "" any noauth exact systemview none none

Changed to:

Access notConfigGroup "" any noauth exact mib2 none none

3. Enable the snmpd service

# service snmpd start

# chkconfig-- levle 2345 snmpd on

4. Check the opening status of the port

# netstat-tunlp | grep snmp

Tcp 0 0 0.0.0. 0 199 0.0.0. 0. 0. 0. V * LISTEN 4973/snmpd

Udp 0 0 0.0.0. 0 161 0.0.0. 0. 0. 0. 0. 0.

Second, MRTG to generate images for browsing needs the support of httpd services, but also needs the support of gd, libpng and zlib software packages, and the normal operation of gd also needs several other software, which are installed below.

# rpm-qa | grep libpng

Libpng-1.2.7-1

Libpng10-1.0.16-1

Libpng10-devel-1.0.16-1

Libpng-devel-1.2.7-1

# rpm-qa | grep ^ libxml

Libxml2-python-2.6.16-6

Libxml2-devel-2.6.16-6

Libxml2-2.6.16-6

# rpm-qa | grep ^ gd-

Gd-2.0.28-4

Gd-devel-2.0.28-4

# rpm-qa | grep jpeg

Libjpeg-6b-33

Libjpeg-devel-6b-33

# rpm-qa | grep zlib

Zlib-1.2.1.2-1.2

Zlib-devel-1.2.1.2-1.2

# rpm-qa | grep freetype

Freetype-2.1.9-1

Freetype-devel-2.1.9-1

Mine has already been installed, if not, please check and fill the gap according to your own situation.

Please make sure that the version number of your package is equal to or higher than the version shown above.

3. Install and configure MRTG

1. Download mrtg. The latest version is mrtg-2.15.2.tar.gz.

# tar zxvf mrtg-2.15.2.tar.gz

# cd mrtg-2.15.2

# / configure-- prefix=/usr/local/mrtg-- sysconfdir=/etc/mrtg-- with-gd=/usr/local/gd2/include-- with-gd-lib=/usr/local/gd2/lib-- with-gd-inc=/usr/local/gd2/include-- with-png=/usr/local/include-- with-png-lib=/usr/local/lib-- with-png-inc=/usr/local/include-- with-zlib=/usr/local/zlib/include-- with-zlib- Lib=/usr/local/zlib/include-with-zlib-inc=/usr/local/zlib/include

# make

# make install

3. Basic configuration

Generate the master configuration file

# / usr/local/mrtg/cfgmaker public@localhost > / etc/mrtg/mrtg.cfg

Edit / etc/mrtg/mrtg.cfg

Set

# WorkDir:/home/http/mrtg

Remove the comments and change to

WorkDir: / usr/local/apache/htdocs/mrtg (here is the default home directory of your httpd)

Remove the comments such as the following line

# Options [_]: growright, bits

Add the following line to realize the display of Chinese characters in the web page

Language:gb2312

Generate the main page file of MRTG web page

# / usr/local/mrtg/bin/indexmaker / etc/mrtg/mrtg.cfg-output=/usr/local/apache/htdocs/mrtg/index.html-title= "My MRTG"

4. Start MRTG

# env LANG=C / usr/local/mrtg/bin/mrtg / etc/mrtg/mrtg.cfg

This command will output some error messages, which can be safely ignored and can be executed three times in a row.

The web page generated by 5.MRTG is static. In order to refresh it constantly, you need to add the above command to crontab.

# crontab-e

Add the following line

* / 3 * env LANG=C / usr/local/mrtg/bin/mrtg / etc/mrtg/mrtg.cfg

Note: this line means that it is refreshed every three minutes, and you can modify the refresh interval according to your needs.

6. After the installation, you can check the results and enter the following address in the browser

Http://192.168.1.100/mrtg (the IP address is your machine IP)

Fourth, an example: memory usage monitoring

1. Create a new folder where scripts are stored

# mkdir-pv / usr/local/apache/htdocs/mrtgsh

two。 Create a script file

# vi / usr/local/apache/htdocs/mrtgsh/mrtg.memory

Add the following script:

#! / bin/bash

# run this script to check the mem usage.

Totalmem= `/ usr/bin/free | grep Mem | awk'{print $2}'`

Usedmem= `/ usr/bin/free | grep Mem | awk'{print $3}'`

UPtime= `/ usr/bin/uptime | awk'{print $3 "" $4 "" $5}'`

Echo $totalmem

Echo $usedmem

Echo $UPtime

Let it have the permission to run

# chmod 755 / usr/local/apache/htdocs/mrtgsh/mrtg.memory

3. Edit / etc/mrtg/mrtg.cfg

Add the following

Target [memory]: `/ usr/local/apache/htdocs/mrtgsh/ mrtg.roomy`

MaxBytes [memory]: 4096000

Title [memory]: Memory Usages

ShortLegend [memory]: &

Kmg [memory]: kB,MB

Kilo [memory]: 1024

YLegend [memory]: Memory Usage:

Legend1 [memory]: Total Memory:

Legend2 [memory]: Used Memory:

LegendI [memory]: Total Memory:

LegendO [memory]: Used Memory:

Options [memory]: growright,gauge,nopercent

PageTop [memory]: Memory Usages

4. Regenerate the main page file

# / usr/local/mrtg/bin/indexmaker / etc/mrtg/mrtg.cfg-output=/usr/local/apache/htdocs/mrtg/index.html-title= "My MRTG"

5. Restart MRTG as appropriate, and then you can see the effect.

Detect CPU load

Create script mrtg.cpu

#! / bin/bash

Cpuusr= `/ usr/bin/sar-u 1 3 | grep Average | awk'{print $3}'`

Cpusys= `/ usr/bin/sar-u 1 3 | grep Average | awk'{print $5}'`

UPtime= `/ usr/bin/uptime | awk'{print $3 "" $4 "" $5}'`

Echo $cpuusr

Echo $cpusys

Echo $UPtime

Echo www.zhang.org, write your host name here.

# vi / etc/mrtg/mrtg.cfg

Add the following

Target [localhost]: `/ usr/local/apache/htdocs/mrtg/cpu/ mrtg.cpu`

MaxBytes [localhost]: 100

Options [localhost]: gauge, nopercent, growright

YLegend [localhost]: CPU loading (%)

ShortLegend [localhost]:%

LegendO [localhost]: CPU user license

LegendI [localhost]: CPU system administrator

Title [localhost]: CPU? t???v

PageTop [localhost]: VBird host CPU failure rate

System: RedHat 6.1 in Linux Kernel 2.2.19

At the same time, we can also detect the number of people online immediately.

Create script mrtg.person.sh

#! / bin/bash

# this program is mainly used to calculate how many people are connected to our mainframe in the way of WWW!

# 1. Calculate the number of connections

Echo `netstat-a | grep www | awk'{print$ 5}'| sort | wc-l | awk'{print$1-1}'`

# netstat-a | grep www | awk'{print $5}'| sort | uniq

# 2. Calculate the number of connections:

Echo `netstat-a | grep www | awk'{print $5}'| cut-d ":"-F1 | sort | uniq | wc-l | awk'{print $1-1}'`

# netstat-a | grep www | awk'{print $5}'| cut-d ":"-F1 | sort | uniq

# 3. Output time

UPtime= `/ usr/bin/uptime | awk'{print $3 "" $4 "" $5}'`

Echo $UPtime

Echo your.host.name

# vi / etc/mrtg/mrtg.cfg

Add the following

# CPU Loading detecting...

Target [tsai.adsldns.org _ person]: `/ usr/local/mrtg-2/bin/ mrtg.person.sh`

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