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software management yum and rpm

rpm => rpm is powerful package managers which can be used to build, install, query, verify, update and erase individual packages. yum => yellowdog updater modified. it is automatic updater and package installation and removal for rpm. 1> install #rpm

Posted in Fundamental

How to upgrad Kernel

How to upgrad Kernel What is Kernel : Kernel is a heart of linux OS. It manages resouces of linux OS. Resouces means facilites available in linux. eg. facility to store data, print data on printer, memory manages, file management,

Posted in Fundamental

Iptables

Iptables By default Iptable work on accept policy. Means if rule not match then it is accepted. In this case we add rule for deny. ===================================================================================================== Change policy default value to Drop => if rule not match it will drop

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CronJob

CronJob cron is the time based job schedular in unix like computer OS. cron enable users to schedule jobs ( command or script ). to run periodically at certain time or dates. It is commanly used to automate system maintenance

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Editors

Editors : ======================================================================================= 1> nano : user friendly test editor #nano filename ======================================================================================= 2> vi editor : It work in 3 different mode 1. command / default mode : It use for cut, copy, paste, delete and read the contects.

Posted in Fundamental

Manage Services

Manage Services 2 Types of services 1. Self service => They have their own daemon. eg. httpd, sshd etc. 2. xinetd services => services do not have own daemon. eg. telnet, rlogin, tftp, pixi, talk. =============================================================================================== 1. How to start/stop/restart/reload

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Networking

Networking ====================================================================================== classes of IP address check first octect of IP address A => 1 to 126 / 255.0.0.0 B => 128 to 191 / 255.255.0.0 C => 192 to 223 / 255.255.255.0 eg. 192.168.1.0 => network ID 192.168.1 And

Posted in Fundamental

Printer Installation

Printer Installation ================================================================== 1> Locally Installation System => administation => printing OR #system-config-printer i. New ii. Select port where printer attached to computer eg. serial port #1 iii. chooose printer driver and company eg. select printer from database HP iv.

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Remote Login

Remote Login =============================================================================================== 1> Linux to Linux Shell access : SSH (secure socket) – encrypted way port no : 22 SSH support both SSL and TLS. In the previous technology it uses protocol telnet Old technology : telnet and rlogin

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Runlevel

Runlevel : Runlevel defins what services or processes should be running on the system. The init process can run the system in one of seven runlevels. The system runs only one of the seven runlevel at a time. Main run

Posted in Fundamental