Cacti Monitoring Linux Hosts

1 to monitor a Linux host, you need to install the NET-SNMP related package on the monitored host, and the CentOS installation can use the "yum-y install NET-SNMP" command:
# yum-y Install Net-snmp
Setting up Install Process
Setting up repositories
Reading repository metadata in from local files
Parsing Package Install arguments
Resolving Dependencies
--Populating transaction set with selected packages. Please wait.
---> Package net-snmp.x86_64 0:5.1.2-18.el4 Set updated
--Running Transaction check

Dependencies resolved

=============================================================================
Package Arch Version Repository Size 
=============================================================================
Installing:
NET-SNMP x86_64 5.1.2-18.el4 Base 509 K

Transaction Summary
=============================================================================
Install 1 package (s) 
Update 0 Package (s) 
Remove 0 Package (s) 
Total Download size:509 k
Downloading Packages:
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
INSTALLING:NET-SNMP ######################### [1/1]

Installed:net-snmp.x86_64 0:5.1.2-18.el4
complete!

2 Modify the configuration file command:
# vi/etc/snmp/snmpd.conf
Make sure that the following green content is included in the snmpd.conf file:
Com2sec notconfiguser Default Public
Group Notconfiggroup v1 Notconfiguser
Group Notconfiggroup v2c Notconfiguser
View SystemView included. 1
Access Notconfiggroup "" Any noauth exact systemview none None
Syslocation Www.cactiez.com
Syscontact Root [email protected]
Pass. 1.3.6.1.4.1.4413.4.1/usr/bin/ucd5820stat
Press ESC when the input is complete, and then press "ZZ" (uppercase)

3 Restart SNMPD Service:
# Service SNMPD Restart
stopping snmpd: [FAILED]
Starting snmpd: [OK]

4 set SNMPD to start automatically at each boot:
# chkconfig SNMPD on
No results are returned when the command finishes executing

5 Check if the SNMPD service is already running:
# Netstat-nlup | grep ": 161"
UDP 0 0 0.0.0.0:161 0.0.0.0:* 16986/snmpd
This command checks if the local is already listening on UDP port 161, and if a similar result is returned, it indicates that the SNMPD service started successfully

6 Ubuntu You can install the SNMPD package using the "Apt-get install snmpd" command:
$ sudo apt-get install SNMPD
Reading Package List ... Complete
Analyzing Dependency tree for Package
Reading status information ... Complete
The following "new" packages will be installed:
Snmpd
0 packages were upgraded, 1 new packages were installed, 0 packages were uninstalled, 67 packages were not upgraded.
You need to download the 0B/92.1KB package.
After decompression, it consumes 377kB of extra space.
"Warning": The following packages cannot be verified!
Snmpd
Do you want to install these packages without verification? [y/n] Y
Pre-Set Package ...
A package snmpd that was previously deselected was selected.
(Reading Database ... The system currently has a total of 195,416 files and directories installed. )
Extracting snmpd (from .../snmpd_5.4.3~dfsg-1ubuntu3_i386.deb) ...
Processing triggers for man-db ...
Processing triggers for ureadahead ...
Setting SNMPD (5.4.3~DFSG-1UBUNTU3) ...
UPDATE-RC.D:WARNING:SNMPD Stop RunLevel Arguments (1) do not match LSB default-stop values (0 1 6)
* Starting Network Management Services: 
Processing triggers for python-central ...

7 Ubuntu configuration files and check methods with CentOS

8 Login Cactiez-web Interface, click on: "Console", "Host", "Add". Similar to the following settings:


8 If everything is OK, you will see a message similar to the following:
Linux hosts (10.1.254.121) 
SNMP Information
Operating system: Linux test-bbs.idc1.cn0571 2.6.9-89.elxenu #1 SMP Mon June
x86_64
Operating time: 169738 (0 days, 0 hours, 28 minutes)
Host Name: test-bbs.idc1.cn0571
Position: Www.cactiez.com
Contact Person: Root [email protected]

If not, please check the community name, IP address, firewall, etc.

9 After the host is added, you need to add graphics, click "Add graphics to this host" in the top right

9.1 Select all objects in the graphics template area:
Added: UCD/NET-CPU utilization 
Added: ucd/net-load average 
Add: Ucd/net-tcp Register 
Added: ucd/net-tcp Number of connections 
Added: ucd/net-Memory utilization 
Add: Host MIB-Number of processes 
Add: Host MIB-Logged in user 

9.2 in the "Data query [SNMP-get disk IO]" area check the name of the disk you need to monitor:
such as SDA,SDB,HDA, etc.
Note that disk IO has two indicators to monitor, one is "disk Io Bytes/sec" and the other is "disk IO Transmit/sec", but only one can be added at a time, if you want to monitor two metrics, you need to add two times

9.3 In the "Data query [SNMP-get processor information]" area check your logical processor, if you have only one logical processor, then this will not be selectable

9.4 In the "Data query [SNMP-Get mounted partition]" area check the name of the disk you need to monitor:
such as "Real Memory", "Swap Space", "/" and so on, depending on your needs hook-and-choose

9.5 Check your network device, such as "eth0", in the "Data query [SNMP-Interface statistics]" area
If the host is a 64-bit host, select incoming/outgoing bit (64 bit)
If the host is a 32-bit host, select incoming/outgoing bits to

10 Click "Add" to complete the setup again.

11 View host status, click on the "Monitor" button above

Cacti Monitoring Linux Hosts