Voir la source de SNMP - Configure SNMP service for Linux

= Introduction =

SNMP configuration on Linux may be complex.

Many documentation exist on Internet but they describe so many different methods it makes it difficult to identify THE best way to do it.

This article will try to identify a kind of procedure to install and configure the service.

= Useful links =

* [https://www.sugarbug.fr/atelier/techniques/monitoring_lan/snmp/ SNMP et la supervision].
* [https://manpages.ubuntu.com/manpages/xenial/man1/snmpusm.1.html snmpusm man page].
* [https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-an-snmp-daemon-and-client-on-ubuntu-18-04 Configure an SNMP daemon and client on Ubuntu 18.04].
* [https://net-snmp.sourceforge.io/docs/README.snmpv3.html net-snmp documentation on SourceForge].
* [https://doc.ubuntu-fr.org/snmp Doc UbuntuFr sur le SNMP].
* [https://www.loriotpro.com/ServiceAndSupport/How_to/UCD-SNMP_ConfigSNMPv1-v1.2.php Configuration de l’agent SNMP V3 Unix].
* ...

= Useful tools =

* [https://linux.die.net/man/1/snmpwalk snmpwalk].
* [https://www.paessler.com/tools/snmptester Paessler SNMP Tester].

= Install and configure the service =

'''Note''': for the moment let's focus on SNMPv3. SNMPv2 should be documented later on.

== Ubuntu / Debian ==

Useful packages:
* snmp
* snmpd
* libsnmp-dev
* snmp-mibs-downloader

Dependencies:
* libsnmp-base
* libsnmp35:amd64

Packages installation:

 apt-get install snmp
 apt-get install snmpd
 apt-get install libsnmp-dev
 apt-get install snmp-mibs-downloader

Service stop:

 systemctl stop snmpd.service

Service configuration:

 vi /etc/snmp/snmpd.conf
 ...
 sysLocation    <location description>
 sysContact     <your sysops contact>
 ...
 agentaddress  127.0.0.1,[::1],<IP of your server>
 ...
 
 net-snmp-config --create-snmpv3-user

'''Note regarding the use of MIBS downloader''': to use it, comment the line in ''/etc/snmp/snmp.conf'':
 # mibs :

'''Note regarding the user creation''': not sure this behavior is systematic but you may have to add such a line to ''/etc/snmp/snmpd.conf'' for your user to be properly created at service restart. This line may be deleted from ''/etc/snmp/snmpd.conf'' after service restart.

 createUser username (MD5|SHA|SHA-512|SHA-384|SHA-256|SHA-224) authpassphrase [DES|AES] [privpassphrase]

Service start:

 systemctl start snmpd.service

'''Note''': think about allowing flows on the firewall you use on or around the system.

[[Category:Howto]]
[[Category:SNMP]]
[[Category:Monitoring]]
[[Category:Linux]]
[[Category:A MODIFIER]]