.::: Enable CPU Temperature Information on Linux (Rhel6/Centos6),(Rhel7/Centos7) Using lm_sensors :::.

lm_sensors (Linux monitoring sensors) is a free and open-source application that provides tools and drivers for monitoring temperatures, voltage, and fans. This document explains how to install, configure, and use lm_sensors.

A. Enable Temperature using lm_sensors

1. Download rpm lm_sensors if you using offline

For Rhel6/Centos6 Download rpm lm_sensors-3.1.1-17.el6.x86_64.rpm then copy to server

# wget  http://mirror.centos.org/centos/6/os/x86_64/Packages/lm_sensors-3.1.1-17.el6.x86_64.rpm

For Rhel7/Centos7 Download lm_sensors-libs-3.4.0-4.20160601gitf9185e5.el7.x86_64.rpm, lm_sensors-3.4.0-4.20160601gitf9185e5.el7.x86_64.rpm

# wget http://mirror.centos.org/centos/7/os/x86_64/Packages/lm_sensors-libs-3.4.0-4.20160601gitf9185e5.el7.x86_64.rpm

# wget https://www.rpmfind.net/linux/centos/7.4.1708/os/x86_64/Packages/lm_sensors-3.4.0-4.20160601gitf9185e5.el7.x86_64.rpm

.::: Install Cacti 1.0.x on Centos 7/Rhel 7 Using MariaDB :::.

Cacti is a complete frontend to RRDTool, it stores all of the necessary information to create graphs and populate them with data in a MySQL database. The frontend is completely PHP driven. Along with being able to maintain Graphs, Data Sources, and Round Robin Archives in a database, cacti handles the data gathering. There is also SNMP support for those used to creating traffic graphs with MRTG.

UPDATE:
Since new release is out, I added the procedures for upgrading cacti 1.0.1 to 1.0.x; and from 1.0.x to 1.1.x
1. Disable SELinux
[root@TeguhLab data]# cat /etc/selinux/config | grep SELINUX
# SELINUX= can take one of these three values:
SELINUX=disabled
# SELINUXTYPE= can take one of three two values:
SELINUXTYPE=targeted
[root@TeguhLab data]#

.::: Install MariaDB 10.1 On Centos/Rhel 7 Using Yum Repository :::.

MariaDB Server is one of the most popular database servers in the world. It’s made by the original developers of MySQL and guaranteed to stay open source. Notable users include Wikipedia, WordPress.com and Google.

MariaDB turns data into structured information in a wide array of applications, ranging from banking to websites. It is an enhanced, drop-in replacement for MySQL. MariaDB is used because it is fast, scalable and robust, with a rich ecosystem of storage engines, plugins and many other tools make it very versatile for a wide variety of use cases.

MariaDB is developed as open source software and as a relational database it provides an SQL interface for accessing data. The latest versions of MariaDB also include GIS and JSON features.

1. Add MariaDB Yum Repository
Start by adding the MariaDB YUM repository file MariaDB.repo for RHEL/CentOS and Fedora systems.
# vi /etc/yum.repos.d/MariaDB.repo

Now add the following lines to your respective Linux distribution version as shown.

On CentOS 7

[mariadb]
name = MariaDB
baseurl = http://yum.mariadb.org/10.1/centos7-amd64
gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
gpgcheck=1

.::: Troubleshoot Error 'X-Frame-Options' to 'sameorigin'or Load denied by X-Frame-Options does not permit cross-origin framing :::.

some application. You can't change the web security setting in Application. The only way to add or remove header options would be to proxy it, e.g with haproxy. Troubleshoot Error 'X-Frame-Options' to 'sameorigin'or Load denied by X-Frame-Options does not permit cross-origin framing

1. Log Error

Error 'X-Frame-Options' to 'sameorigin'or Load denied by X-Frame-Options does not permit cross-origin framing

.:: Generate Triger Alarm Alcatel Lucent/Nokia 7750, 7450, 7210, 7705 :::.

1. Check snmp & snmptrap community
A:TeguhRouter# show system security snmp community

==============================================================================
Communities
==============================================================================
community           access  view                version   group name
------------------------------------------------------------------------------
cli-li-readwrite    n/a     li-view             v2c       cli-li-readwrite
cli-readonly        r       iso                 v2c       cli-readonly
cli-readwrite       rw      iso                 v2c       cli-readwrite
public              r       no-security         v1 v2c    snmp-ro
public              n/a     n/a                 v2c       snmp-trap
teguht              rwa     iso                 v2c       snmp-rwa
------------------------------------------------------------------------------
No. of Communities: 9
==============================================================================
A:TeguhRouter# show log snmp-trap-group       

.::: Install/Upgrade Minimal to Desktop Environment on Centos/RHEL(Redhat Enterprise Linux ) :::.

1. List Installed and Available Groups
[root@TeguhLab ~]# yum grouplist
Loaded plugins: fastestmirror
There is no installed groups file.
Maybe run: yum groups mark convert (see man yum)
Loading mirror speeds from cached hostfile
 * base: sumberterbuka.beritagar.id
 * extras: sumberterbuka.beritagar.id
 * updates: sumberterbuka.beritagar.id
Available environment groups:
   Minimal Install
   Compute Node
   Infrastructure Server
   File and Print Server
   Basic Web Server
   Virtualization Host
   Server with GUI
   GNOME Desktop
   KDE Plasma Workspaces
   Development and Creative Workstation

.::: How To Enable SNMP & SNMPTrap on Alcatel Lucent/Nokia Router(7750, 7710, 7705,7750) :::.

A. Enable SNMP Router Alcatel Lucent

1. Check snmpwalk router

# snmpwalk -v2c -c teguht 10.10.10.10 sysDescr

# snmpwalk -v2c -c teguht 10.10.10.10 1.3.6.1.2.1.1

[root@TeguhLab ~]# snmpwalk -v2c -c teguht 10.10.10.10 sysDescr

Timeout: No Response from 10.10.10.10

[root@TeguhLab ~]# snmpwalk -v2c -c teguht 10.10.10.10 1.3.6.1.2.1.1

Timeout: No Response from 10.10.10.10

[root@TeguhLab ~]#

.::: How To Commission & Enable SNMP an OmniSwitch Alcatel Lucent for NMS :::.

Before you begin. See the appropriate OmniSwitch documentation for more information about the CLI command syntax and SNMP.

Note: The NMS cannot discover an OmniSwitch that is configured with the factory default settings.

Note: You must use a direct console port connection to access an OmniSwitch for the first time. All other management methods such as SNMP, Telnet, FTP, and HTTP, are disabled until you enable them.

1. Open a console window using a direct console port connection to the OmniSwitch.

2. Create a Loopback0 interface and assign an IP address to the interface by entering

the following:

ip interface Loopback0 address xxx.xxx.xxx.xxx

where

xxx.xxx.xxx.xxx is the IP address of the interface

.::: How to Check License subscription-manager RHEL(Red Hat Enterprise Linux) :::.

Red Hat Enterprise Linux Server subscription is available at no cost for development purposes. Developers need to register for the Red Hat Developer Program and agree to licensing terms forbidding production use. This free developer subscription was announced on March 31, 2016.

There are also "Academic" editions of the Desktop and Server variants. They are offered to schools and students, are less expensive, and are provided with Red Hat technical support as an optional extra. Web support based on number of customer contacts can be purchased separately.

1. Sample command
# subscription-manager orgs
# subscription-manager refresh
# subscription-manager status
# subscription-manager list
# subscription-manager list --consume

.::: How To Upgrade Cacti on Linux :::.

note: this cace, upgrade cacti 0.8.8.b to 0.8.8.h
1. Backup the old Cacti database
mysqldump -l --add-drop-table <db_name> -u <user> -p  > mysql.cacti
[root@TeguhLab data]# mysqldump -l --add-drop-table cacti -u root -p > mysql.cacti
Enter password:
[root@TeguhLab data]# ls
mysql.cacti  rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
[root@TeguhLab data]# ls -lh
total 156K
-rw-r--r-- 1 root root 138K Aug  3 14:45 mysql.cacti
-rw-r--r-- 1 root root  13K Mar 20  2013 rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
[root@TeguhLab data]#

.::: How To Install Cacti On Linux :::.

Cacti is a complete frontend to RRDTool, it stores all of the necessary information to create graphs and populate them with data in a MySQL database. The frontend is completely PHP driven. Along with being able to maintain Graphs, Data Sources, and Round Robin Archives in a database, cacti handles the data gathering. There is also SNMP support for those used to creating traffic graphs with MRTG.

Note : using mysql 5.1.73 & cacti 0.8.8.b

1. Disable SE Linux
[root@TeguhLab ~]# cat /etc/selinux/config

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
SELINUX=disabled

.::: Different Output OID ifDescr & ifAlias :::.

1. Different ifDescr, ifName & ifAlias
ifDescr OBJECT-TYPE
    SYNTAX      DisplayString (SIZE (0..255))
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "A textual string containing information about the
            interface.  This string should include the name of the
            manufacturer, the product name and the version of the
            interface hardware/software."
    ::= { ifEntry 2 }