.::: How to configure remote logging with rsyslog(Enable syslog) On Linux/Rhel/Centos :::.

In RHEL-6 rsyslog is default logging daemon, In RHEL-5 rsyslog is available but not installed by default.

1. Install rsyslog
# yum -y install rsyslog 

2. Configure the remote server(CLIENT) to accept remote log messages using TCP/UDP.
Uncomment the following lines in the MODULES section of /etc/rsyslog.conf
[root@TeguhClientSyslog ~]# cat /etc/rsyslog.conf
.....
# Provides UDP syslog reception
#$ModLoad imudp
#$UDPServerRun 514

.::: OID Memory Utilization for Monitoring Windows, Linux :::.

This resource displays linear or radial gauges of both the percentage load on the CPU of the selected node and the percentage of available MEMORY on the selected node over the current monitoring period. Reported values are updated regularly, on the Polling Interval.

1. OID for Memory Utilization
hrSWRunIndex hrSWRunIndex     1.3.6.1.2.1.25.4.2.1.1 Memory Index
hrSWRunName hrSWRunName     1.3.6.1.2.1.25.4.2.1.2 Memory Name
hrSWRunPerfMem hrSWRunPerfMem     1.3.6.1.2.1.25.5.1.1.2   Memory Usage
hrMemorySize hrMemorySize     1.3.6.1.2.1.25.2.2 mem total Memory Total
[root@TeguhLab ~]# snmpwalk -v2c -c public 10.10.10.10 sysDescr
SNMPv2-MIB::sysDescr.0 = STRING: Hardware: Intel64 Family 6 Model 62 Stepping 4 AT/AT COMPATIBLE - Software: Windows Version 6.0 (Build 6002 Multiprocessor Free)
[root@TeguhLab ~]#

.::: OID CPU Utilization for Monitoring CPU Windows, Linux, Appliance & Other :::.

CPU utilization is the sum of work handled by a Central Processing Unit. It is also used to estimate system performance. CPU utilization can vary according to the type and amount of computing task because some tasks require heavy CPU time while others require less CPU time. Process time is another name for CPU time and is the amount of time used by a CPU for processing instruction of an operating system or a computer program. CPU time is quantified in clock ticks or seconds. CPU utilization shows the burden on a processor in terms of percentage that indicates if any changes are to be made in the system otherwise it may get exhausted of capacity.

CPU utilization can be calculated by using the following formulas.

Let us define CPU utilization as U


U = 100% - (Percentage of time that is spent in idle task)


% time in idle task =

(Take the average time period of background task without load) * 100%
-------------------------------------------------------------------------------------------------------
(Avg. period of background task including some load)