Use python to expand SNMP

During this period of time, the server status is monitored.SNMPProtocol.SNMPInstallation configuration andPythonExtensionSNMPRecord it for later reference.

I. Installation SNMP 1 , Linux Install Net-snmp

Environment:Centos 6.3 _ 64

1.1PassYumSearchSNMPComplete name

Yum search SNMP

1.2InstallNet-snmp

Yum install net-snmp-y

Installed successfully. Version:5.5:

1.3Change configuration file

File Path:/Etc/snmp/snmpd. conf

Modify the following key points based on the default configuration file:

Note:

41The default value does not need to be changed.PublicThe key is to use it later.

47Rows and48Row isSNMPProtocol version.

57Rows and64Row useAllOpen the permission (note that this is onlyDemo)

1.4StartSNMPService

/Etc/init. d/snmpd start

Or

Service snmpd start

Configure boot start:

Chkconfig snmpd on

1.5VerifySNMP

Snmpwalk-V 1-C public ipaddr. 1

Appendix:

If the service cannot run properly after it is started, first check the Firewall Status:/Etc/init. d/iptables status

Perform the following operations as needed:

Temporarily disable the Firewall:/Etc/init. d/iptables stop

Permanently disable the Firewall:Chkconfig -- level 35 iptables off

Set161Port and162Port setting through Firewall:

VI/etc/sysconfig/iptables

Add the following content:

-A input-M state -- state new-m udp-p udp -- dport 161-J accept

-A input-M state -- state new-m udp-p udp -- dport 162-J accept

:

RestartIptablesService:

Service iptables restart

Or

/Etc/init. d/iptables restart

2 , Windows Install Net-snmp

URL:Http://sourceforge.net/projects/net-snmp/files/

Download path:Http://hivelocity.dl.sourceforge.net/project/net-snmp/net-snmp%20binaries/5.5.1-binaries/net-snmp-5.5.1-1.x86.exe

There are more detailed tutorials on the Internet, so I will not go into details here,

For details, refer to here:Http://www.cnblogs.com/VRS_technology/archive/2010/08/12/1798191.html

Key point: in the path (software installation path)\ Etc \ SNMP \, Add a fileSnmpd. conf(My approach isLinuxUnderSnmpd. confFile directlyCopy).

Ii. Use Python Extension SNMP

InSnmpd. confThe file containsBashExample of extension ,:

My version is5.5I don't know why, although the configuration file is usedExecBut I found thatExtend.

BashConfiguration:

Extend. 1.3.6.1.4.1.23456.51 shelltest2/bin/sh/tmp/test1.sh

PythonConfiguration:

Extend. 1.3.6.1.4.1.23456.52 pythontest/usr/bin/Python/tmp/test1.py 

Test1.shThe content is as follows:

 
#! /Bin/ShEcho "123"Exit22
 

Test1.pyThe content is as follows:

 
#! /Usr/bin/PythonPrint "Just a test"
 

RestartSnmpdService:

Service snmpd restart

SnmpwalkAccess:

Snmpwalk-V 1-C public localhost. 1.3.6.1.4.1.23456.50.4.1

Snmpwalk-V 1-C public localhost. 1.3.6.1.4.1.23456.51.4.1

Snmpwalk-V 1-C public localhost. 1.3.6.1.4.1.23456.52.4.1

Execution result

We can see thatExtendBoth configurations are successfully executed.

If the following error occurs, disableSELinux:

String: "/usr/bin/Python: Can't open file '/tmp/test1.py': [errno 13] Permission denied"

Appendix:

ViewSELinuxStatus:Getenforce

Temporarily closeSELinux(No need to restart ):Setenforce 0

Permanently closeSELinux(Restart required ):

VI/etc/SELinux/config

SetSELinux = enforcingChangeSELinux = Disable,:

3. Implement Custom Service Status Monitoring

This is actually something in the second part. It is listed separately to introduce a cross-platform server status monitoring.PythonModule:Psutil

PsutilIs used to obtain information about running processes and systemsCPUAnd memory usage (supportedLinux, OS X, and FreeBSDAndWindowsSystem ).

URL:Https://github.com/elventear/psutil

PythonCode(Getcpuusage. py):

#! /Usr/bin/PythonImportPsutilPrintPsutil. cpu_percent ()
 

Snmpd. confConfiguration:

Extend. 1.3.6.1.4.1.23456.60 getcpuusage/usr/bin/Python/tmp/getcpuusage. py