1.Repository EPEL for CentOS Stream 8 & 9 Version

dnf install epel-release epel-next-release

2 : Install Apache web server.

#yum -y install httpd
#systemctl start httpd.service
#systemctl enable httpd.service

3 : Install MRTG through YUM

 yum -y install net-snmp mrtg net-snmp-utils

4 : Configure SNMP

For monitor network interface and other resources like CPU , memory , we should configure snmpd “/etc/snmp/snmpd.conf” .

5 : Edit the configuration file.

vim /etc/snmp/snmpd.conf

Now make change as i have describe below.

(a) comment the line with hash on line number 41 like below.

com2sec notConfigUser default public

(b) uncomment the line number 74,75 ,remove NETWORK/24 and replace with your network.

Before changes
#com2sec local localhost COMMUNITY
#com2sec mynetwork NETWORK/24 COMMUNITY

After Changes 
com2sec local localhost techtransit
com2sec mynetwork 172.24.0.0/24 techtransit

(c) un comment the line 78,79 . Replace techtransit from your any word.

group MyRWGroup v2c local
group MyROGroup v2c mynetwork

(d) uncomment the line 85 .

view all included  .1  80

(f) uncomment the line 93,94 . Replace techtransit from your name.

access MyROGroup "" v2c noauth 0 all none none
access MyRWGroup "" v2c noauth 0 all all all

6 : Start the snmpd service and enable from autoboot .

#systemctl start snmpd.service
#systemctl enable snmpd.service

7 :

show status (replace the “techtransit” to your comunity name)

[root@server ~]# snmpwalk -v2c -c techtransit localhost system

SNMPv2-MIB::sysDescr.0 = STRING: Linux server.techtransit.org 3.10.0-229.14.1.el7.x86_64 #1 SMP Tue Sep 15 15:05:51 UTC 2015 x86_64
SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (8004) 0:01:20.04
SNMPv2-MIB::sysContact.0 = STRING: Root <root@localhost> (configure /etc/snmp/snmp.local.conf)
SNMPv2-MIB::sysName.0 = STRING: server.techtransit.org
SNMPv2-MIB::sysLocation.0 = STRING: Unknown (edit /etc/snmp/snmpd.conf)
SNMPv2-MIB::sysORLastChange.0 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORID.1 = OID: SNMP-MPD-MIB::snmpMPDCompliance
SNMPv2-MIB::sysORID.2 = OID: SNMP-USER-BASED-SM-MIB::usmMIBCompliance
SNMPv2-MIB::sysORID.3 = OID: SNMP-FRAMEWORK-MIB::snmpFrameworkMIBCompliance
SNMPv2-MIB::sysORID.4 = OID: SNMPv2-MIB::snmpMIB
SNMPv2-MIB::sysORID.5 = OID: TCP-MIB::tcpMIB
SNMPv2-MIB::sysORID.6 = OID: IP-MIB::ip
SNMPv2-MIB::sysORID.7 = OID: UDP-MIB::udpMIB
SNMPv2-MIB::sysORID.8 = OID: SNMP-VIEW-BASED-ACM-MIB::vacmBasicGroup
SNMPv2-MIB::sysORID.9 = OID: SNMP-NOTIFICATION-MIB::snmpNotifyFullCompliance
SNMPv2-MIB::sysORID.10 = OID: NOTIFICATION-LOG-MIB::notificationLogMIB
SNMPv2-MIB::sysORDescr.1 = STRING: The MIB for Message Processing and Dispatching.
SNMPv2-MIB::sysORDescr.2 = STRING: The management information definitions for the SNMP User-based Security Model.
SNMPv2-MIB::sysORDescr.3 = STRING: The SNMP Management Architecture MIB.
SNMPv2-MIB::sysORDescr.4 = STRING: The MIB module for SNMPv2 entities
SNMPv2-MIB::sysORDescr.5 = STRING: The MIB module for managing TCP implementations
SNMPv2-MIB::sysORDescr.6 = STRING: The MIB module for managing IP and ICMP implementations
SNMPv2-MIB::sysORDescr.7 = STRING: The MIB module for managing UDP implementations
SNMPv2-MIB::sysORDescr.8 = STRING: View-based Access Control Model for SNMP.
SNMPv2-MIB::sysORDescr.9 = STRING: The MIB modules for managing SNMP Notification, plus filtering.
SNMPv2-MIB::sysORDescr.10 = STRING: The MIB module for logging SNMP Notifications.
SNMPv2-MIB::sysORUpTime.1 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORUpTime.2 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORUpTime.3 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORUpTime.4 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORUpTime.5 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORUpTime.6 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORUpTime.7 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORUpTime.8 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORUpTime.9 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORUpTime.10 = Timeticks: (2) 0:00:00.02

Creating MRTG Configuration :

Now we will create a configuration file for mrtg data storage, run the command below and output will redirect in the mrtg configuration file.Replace your community name and ip of your server.You can also change WorkDir .

[root@server ~]#cfgmaker --snmp-options=:::::2 --ifref=descr --ifdesc=descr --global 'WorkDir: /var/www/html/mymrtg' techtransit@172.24.0.69 > /etc/mrtg/mrtg.cfg

If you want the graph data in bits instead of bytes , uncomment the below lines from /etc/mrtg/mrtg.cfg configuration file.

#vim /etc/mrtg/mrtg.cfg

Options[_]: growright, bits

Uncomment the below line , which should on line 75 and save and exit from the configuraiton file.

Target[172.24.0.69_eth0]: \eth0:techtransit@172.24.0.69:::::2
noHC[172.24.0.69_eth0]: yes
SetEnv[172.24.0.69_eth0]: MRTG_INT_IP="172.24.0.69" MRTG_INT_DESCR="eth0"
MaxBytes[172.24.0.69_eth0]: 250000000
Title[172.24.0.69_eth0]: eth0 -- server.techtransit.org
PageTop[172.24.0.69_eth0]: <h1>eth0 -- server.techtransit.org</h1>

Create Index File on mrtg document root through below command.

indexmaker --columns=1 /etc/mrtg/mrtg.cfg > /var/www/html/mymrtg/index.html

Now MRTG Configure on apache configuration file.

Edit the mrtg apache configuration file.

#vim /etc/httpd/conf.d/mrtg.conf

Edit the file like below , change the ip with your ip .

Alias /mrtg /var/www/html/mymrtg

<Location /var/www/html/mymrtg>
Require local
Require ip 172.24.0.69
# Require host example.org
</Location>

Start Apache :

#systemctl start httpd.service

Now configuration of mrtg has been done and access URL for MRTG Graph will be like below.

http://server-hostname or IP Address/mymrtg