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NTP server : Network time protocol Port : 123

NTP server : Network time protocol Port : 123 OR remote time server NTP server is used to set same time on client machines. Manually it is not possible to configure same time on multiple machine. ======================================================================================================= ***** server configuration

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SMTP server port no : 25

SMTP server port no : 25 SMTP : Simple mail Transfer protocol LMTP : local mail transfer protocol SMTP is used when mail is delivered from an email client such as outook to an email server or when delivered from

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steps to create yum server

steps to create yum server 1. insert linux dvd and mount it #mount /dev/cdrom /mnt or #mount -o file.iso /mnt [ mount iso directory ] 2> copy packages #cd /mnt #cd Packages 3> install ftp service #rpm -ivh vsftpd* other

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Telnet server (23)

Telnet server (23) this is used for remote login, but it is not secure as SSH. server side 1> #yum install telnet-server telnet -y 2> #vim /etc/xinetd.d/telnet disable=no [ by default disable so enable it as putting no value ]

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SSH 22

SSH 22 SSH ( secure Shell server ) is a program for login into a remote machine. and for executing commands on a remote machine. It is a replace to rlogin, telnet and rsh protocol. SSH provide secure encrypted communications

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LDAP port no 389

LDAP port no 389 LightWeight Directory Access Protocol The LDAP is an application protocol for accessing and maintaining distributed directory information services over an internet protocol (IP) network Directory services may provide any organized set of records often with hierarchical

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FTP servers port no : 20/21

FTP servers port no : 20/21 the file transfer protocal (ftp) is used as one of the most common means of copying files between servers over the internet. Most of web based download sites use the built in FTP capabilites

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DNS server : 53

DNS server : 53 Domain name system / service => DNS service is needed for resolving the hostname to IP address. port 53 udp : dns quries 53 tcp : zone transfer and dns quries ============================================================ configure DNS server 1>

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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