Install MRTG in Linux to check CPU, network, and memory usage

Preparations

# yum -y install gd-devel# yum -y install libmcrypt# yum -y install libmcrypt-devel# yum -y install freetype# yum -y install freetype-devel# yum -y install libtool-ltdl# yum -y install libtool-ltdl-devel# yum -y install libjpeg-devel# yum -y install libpng-devel# yum -y install libmcrypt# yum -y install libmcrypt-devel# yum -y install zlib-1.2.3

1. Install SNMP in yum

1.

# yum -y install net-snmp*

2. Modify/etc/snmp/snmpd. conf

# vim /etc/snmp/snmpd.conf

Find the following line:

# sec.name source community com2sec notConfigUser default public

Set public
Change to another name. To prevent hacker attacks, I changed it to jdeyes.

Remove the comment of the following line.

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

Add the following row to row 55th:

view    systemview    included   .1.3.6.1.2.1.2

Set the following lines

access  notConfigGroup ""      any       noauth    exact  systemview none none

Modified:

access  notConfigGroup ""      any       noauth    exact  mib2 none none

3. Enable the snmpd service

# service snmpd start# chkconfig snmpd on

4. view the port enabling status

# netstat -tunlp |grep snmptcp        0      0 0.0.0.0:199             0.0.0.0:*               LISTEN      4973/snmpd          udp        0      0 0.0.0.0:161             0.0.0.0:*                           4973/snmpd    

Ii. install and configure MRTG

1. Download MRTG

# wget http://oss.oetiker.ch/mrtg/pub/mrtg-2.17.4.tar.gz

2. Install mrtg-2.17.4

# tar zxvf mrtg-2.17.4.tar.gz# cd mrtg-2.17.4 # ./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 main configuration file

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

Edit/etc/mrtg. cfg

# vim /etc/mrtg.cfg

Set

# WorkDir:/home/http/mrtg

Remove the comment and change it

Workdir:/home/htdocs/monitor/MRTG (here is the default home directory of your httpd)

Remove the comment of the following line

# Options[_]: growright, bits

Generate the MRTG webpage homepage File

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

4. Start MRTG

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

This command outputs some error information, which can be safely ignored. You can execute this command three times in a row.

5. The web pages generated by MRTG are static. to refresh the pages continuously, add the preceding commands to crontab.

# vim /etc/crontab 

Add the following line

*/5 * * * * root env LANG=C /usr/local/mrtg/bin/mrtg /etc/mrtg.cfg

Note: This row indicates that the refresh interval is refreshed every three minutes. You can modify the refresh interval as needed.

Restart the SNMP service:

# sudo /etc/init.d/snmpd restart

You can run the following command:

# snmpwalk -v 2c -c ferdinand localhost system

To check whether the installation is successful.

Iii. Example: memory usage monitoring

1. Create a folder to store scripts

# mkdir -pv /home/htdocs/monitor/mrtg/sh

2. Create a script file

# vim /home/htdocs/monitor/mrtg/sh/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 $totalmemecho $usedmemecho $UPtimeecho localhost

3. grant it the operation permission.

# chmod +x /home/htdocs/monitor/mrtg/sh/mrtg.memory

4. Example: CPU usage monitoring

Sysstat
Install with yum

# yum install sysstat

Sysstat installation package is: sysstat-5.0.5-1.i386.rpm, installed sysstat-5.0.5-1.i386.rpm
Then there will be iostat, mpstat, SAR, sa function, sysstat-5.0.5-1.i386.rpm

Start sysstat

# /etc/init.d/sysstat start

Set sysstat to start automatically

# /sbin/chkconfig sysstat on

1. Create a script file

# vim /home/htdocs/monitor/mrtg/sh/mrtg.cpu

Add the following script:

#! /Bin/bash # This program is a small external program used to compute CPU! #1. start to use SAR to reset the CPU user and system memory usage rate 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 localhost

2. grant it the operation permission.

# chmod +x /home/htdocs/monitor/mrtg/sh/mrtg.cpu

Edit the MRTG configuration file

# vim /etc/mrtg.cfg

Add

# Memorytarget [Memory]: '/home/htdocs/monitor/MRTG/SH/mrtg. memory 'maxbytes [Memory]: 4096000 title [Memory]: Memory usagesshortlegend [Memory]: & kmg [Memory]: kb, mbkilo [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, nopercentpagetop [Memory]: 
Now, MRTG has been installed and configured. You only need to configure an access address on nginx or Apache!
The final effect is as follows: