How Do You Install and Configure SNMP on CentOS 7 Linux?

[Fazza]

I'm trying to add our Snipe-IT server to our Mutiny network monitoring system but it's not working!

 

Snipe-IT is installed on CentOS 7 so it's this I need to install and configure SNMP on.

 

This is what I've done so far:

 

• # yum -y install net-snmp net-snmp-utils
  
• I then copied across the pre-configured files from Mutiny's website (snmpd.conf and snmpd.local.conf)
  
• # systemctl enable snmpd && systemctl start snmpd
  
• restarted the server
  

 

When connecting via SNMP it's saying there is no SNMP response so either something is missing or it's getting blocked somehow?

[computer_expert]

Have you allowed the SMNP ports through firewalld?

 

I think it is something like port 161 for SNMP but you'll need to double check

[Fazza]

Have you allowed the SMNP ports through firewalld?

 

I think it is something like port 161 for SNMP but you'll need to double check

 

Nope!

 

No idea how so I'll search for a command that does that then

[computer_expert]

This should do the trick (assuming you are using the public zone):

sudo firewall-cmd --zone=public --add-service=snmp --permanent 

 

There is a good article on firewalld here https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-using-firewalld-on-centos-7

Edited July 19, 2018 by computer_expert

[JackCPickup]

If amending the firewall doesn't do the trick try troubleshooting with Paessler's SNMP Tester.

[Fazza]

This should do the trick (assuming you are using the public zone):

sudo firewall-cmd --zone=public --add-service=snmp --permanent 

 

Thanks for that!

 

I've renamed 'public' to 'rainbow' - that's a lie, it's not rainbow but I'm not putting the one I actually use online!

 

Do I need to ammend the above command to say --zone=public to --zone=rainbow or is that not what public in this instance is referring to?

[JackCPickup]

Thanks for that!

 

I've renamed 'public' to 'rainbow' - that's a lie, it's not rainbow but I'm not putting the one I actually use online!

 

Do I need to ammend the above command to say --zone=public to --zone=rainbow or is that not what public in this instance is referring to?

 

It is the same as the zones in Windows; Public, Private, Domain, except there are quite a few more zones available. They enable predefined firewall features based on the level of trust each zone represents.

[kmount]

Fazza, I think you mean the community public in snmp you renamed - this isn't the same thing. It's the firewall zone and I suspect yours will still be public.

[JackCPickup]

sudo firewall-cmd --get-default-zone

 

To verify which you need to configure.

[Fazza]

Worked like a dream - thanks!