Configure SNMP in Linux [RHEL7/RHEL8/CentOS]

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Configure SNMP in Linux [RHEL7/RHEL8/CentOS]

Packages for required for SNMP
-------------------------------------------
net-snmp.x86_64                                                                                                   
net-snmp-agent-libs.x86_64                                                                             
net-snmp-libs.x86_64                                                                                     
net-snmp-utils.x86_64         
---------------------------------------------

Check if all required packages installed, if not installed install as below:

# yum list *snmp*

Available packages
net-snmp.x86_64                   @rhel-7-server-rpms                                                                               
net-snmp-agent-libs.x86_64  @rhel-7-server-rpms                                                                               
net-snmp-libs.x86_64            @rhel-7-server-rpms                                                                               
net-snmp-utils.x86_64           @rhel-7-server-rpms

# yum install net-snmp.x86_64 net-snmp-agent-libs.x86_64 net-snmp-libs.x86_64 net-snmp-utils.x86_64

Configure snmp configuration file:

# vi /etc/snmp/snmpd.conf (Go to end of the file and check if snmp users are configured as below)
rouser <snmpuser>
rouser <snmpuser>

Use below command to add user in snmpd.conf file:
# net-snmp-create-v3-user -ro -A <password> -X <password> -a MD5 -x DES <user_name>

Will add the following line to /var/lib/net-snmp/snmpd.conf:
   createUser <User_Name> MD5 "<Password>" DES <Password>en

Will add the following line to /etc/snmp/snmpd.conf:
   rouser <User_Name>

# /bin/systemctl status snmpd.service

● snmpd.service - Simple Network Management Protocol (SNMP) Daemon.
   Loaded: loaded (/usr/lib/systemd/system/snmpd.service; disabled; vendor preset: disabled)
   Active: inactive (dead)

# /bin/systemctl start snmpd.service

# systemctl enable snmpd.service

# systemctl is-enabled snmpd.service

# systemctl list-unit-files --type service

Created symlink from /etc/systemd/system/multi-user.target.wants/snmpd.service to /usr/lib/systemd/system/snmpd.service.

# snmpwalk -v 3 -u <User_Name> -a MD5 -A <Password> -l authPriv -x DES -X <Password>en <IP_xxx.xxx.xxx.xxx>

# snmpwalk -v 3 -u <User_Name> -a MD5 -A <Password> -l authPriv -x DES -X <Password>en localhost

# /bin/systemctl restart snmpd.service

----------------------------------------------------------------------------------------------------
OR Configure manually as below:
----------------------------------------------------------------------------------------------------

Edit the snmp configuration file "snmpd.conf" :

# vi /var/lib/net-snmp/snmpd.conf (Change below line)

createUser admin MD5 "<Password>" <Password>

# vi /etc/snmp/snmpd.conf (At the end of file add as below)
rwuser <User_Name>

# service snmpd restart

# /bin/systemctl restart snmpd.service
# systemctl enable snmpd.service

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