How to Install and Configure SNMP in CentOS
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To Install and Configure SNMP in CentOS
SNMP stands for Simple Network Management Protocol. It is an internet standard protocol that can retrieve the operational statistics of the routers and firewalls remotely. This article explains the installation and configuration process of the SNMP in CentOS.
Installation of SNMP
Utilize the ' yum' command to install SNMP packages.
[root@linuxhelp ~]# yum -y install net-snmp net-snmp-utils
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirror.fibergrid.in
* extras: mirror.fibergrid.in
* updates: mirror.fibergrid.in
Resolving Dependencies
--> Running transaction check
---> Package net-snmp.x86_64 1:5.7.2-24.el7_2.1 will be installed
--> Processing Dependency: net-snmp-libs = 1:5.7.2-24.el7_2.1 for package: 1:net-snmp-5.7.2-24.el7_2.1.x86_64
--> Processing Dependency: net-snmp-agent-libs = 1:5.7.2-24.el7_2.1 for package: 1:net-snmp-5.7.2-24.el7_2.1.x86_64
--> Processing Dependency: libnetsnmptrapd.so.31()(64bit) for package: 1:net-snmp-5.7.2-24.el7_2.1.x86_64
--> Processing Dependency: libnetsnmpmibs.so.31()(64bit) for package: 1:net-snmp-5.7.2-24.el7_2.1.x86_64
.
.
Installed:
net-snmp.x86_64 1:5.7.2-24.el7_2.1
Dependency Installed:
net-snmp-agent-libs.x86_64 1:5.7.2-24.el7_2.1
Updated:
net-snmp-utils.x86_64 1:5.7.2-24.el7_2.1
Dependency Updated:
net-snmp-libs.x86_64 1:5.7.2-24.el7_2.1
Complete!
Once the SNMP packages is installed, add the basic configuration for SNMP.
[root@linuxhelp ~]# mv /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.orig
Move the SNMP configuration to an alternate location, /etc/snmp/snmpd.conf.orig.
Now its time to create a new file and add the following lines as shown below,
[root@linuxhelp ~]# vim /etc/snmp/snmpd.conf
# Map ' idv90we3rnov90wer' community to the ' ConfigUser'
# Map ' 209ijvfwer0df92jd' community to the ' AllUser'
# sec.name source community
com2sec ConfigUser default idv90we3rnov90wer
com2sec AllUser default 209ijvfwer0df92jd
# Map ' ConfigUser' to ' ConfigGroup' for SNMP Version 2c
# Map ' AllUser' to ' AllGroup' for SNMP Version 2c
# sec.model sec.name
group ConfigGroup v2c ConfigUser
group AllGroup v2c AllUser
# Define ' SystemView' , which includes everything under .1.3.6.1.2.1.1 (or .1.3.6.1.2.1.25.1)
# Define ' AllView' , which includes everything under .1
# incl/excl subtree
view SystemView included .1.3.6.1.2.1.1
view SystemView included .1.3.6.1.2.1.25.1.1
view AllView included .1
# Give ' ConfigGroup' read access to objects in the view ' SystemView'
# Give ' AllGroup' read access to objects in the view ' AllView'
# context model level prefix read write notify
access ConfigGroup " " any noauth exact SystemView none none
access AllGroup " " any noauth exact AllView none none
Save and exit the file.
Restart the SNMP to take effect.
[root@linuxhelp ~]# service snmpd restart
Redirecting to /bin/systemctl restart snmpd.service
Configure SNMP to start when the server boots:
[root@linuxhelp ~]# chkconfig snmpd on
Note: Forwarding request to ' systemctl enable snmpd.service' .
ln -s ' /usr/lib/systemd/system/snmpd.service' ' /etc/systemd/system/multi-user.target.wants/snmpd.service'
Try out the following two commands to test the SNMP configuration file.
[root@linuxhelp ~]# snmpwalk -v 2c -c idv90we3rnov90wer -O e 127.0.0.1 SNMPv2-MIB::sysDescr.0 = STRING: Linux linuxhelp 3.10.0-123.el7.x86_64 #1 SMP Mon Jun 30 12:09:22 UTC 2014 x86_64 SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10 DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (19818) 0:03:18.18 SNMPv2-MIB::sysContact.0 = STRING: root@localhost SNMPv2-MIB::sysName.0 = STRING: linuxhelp SNMPv2-MIB::sysLocation.0 = STRING: Unknown SNMPv2-MIB::sysORLastChange.0 = Timeticks: (5) 0:00:00.05 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::sysORUpTime.9 = Timeticks: (5) 0:00:00.05 SNMPv2-MIB::sysORUpTime.10 = Timeticks: (5) 0:00:00.05 HOST-RESOURCES-MIB::hrSystemUptime.0 = Timeticks: (178268) 0:29:42.68 HOST-RESOURCES-MIB::hrSystemUptime.0 = No more variables left in this MIB View (It is past the end of the MIB tree) [root@linuxhelp ~]# snmpwalk -v 2c -c 209ijvfwer0df92jd -O e 127.0.0.1 SNMPv2-MIB::sysDescr.0 = STRING: Linux linuxhelp 3.10.0-123.el7.x86_64 #1 SMP Mon Jun 30 12:09:22 UTC 2014 x86_64 SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10 DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (25414) 0:04:14.14 SNMPv2-MIB::sysContact.0 = STRING: root@localhost SNMPv2-MIB::sysName.0 = STRING: linuxhelp SNMPv2-MIB::sysLocation.0 = STRING: Unknown SNMPv2-MIB::sysORLastChange.0 = Timeticks: (5) 0:00:00.05 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 . . . SCTP-MIB::sctpRtoInitial.0 = Gauge32: 0 milliseconds SCTP-MIB::sctpMaxAssocs.0 = INTEGER: 0 SCTP-MIB::sctpValCookieLife.0 = Gauge32: 0 milliseconds SCTP-MIB::sctpMaxInitRetr.0 = Gauge32: 0
The result for your first command is about 33 lines and contain some basic system information. But the second command will display the information about the system and likely be thousands of lines.
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