terminal

Linux SSH (Secure Shell)

SSH is a network protocol. It allows data to be exchanged using a secure channel between two networked devices. Same protocol is used for: ssh sftp scp RPM packages required to rum ssh includes: Openssh.rpm…


file tansfer

File Transfer Protocol (FTP)

Package: vsftpd—-.rpm Configuration file: /etc/vsftpd/vsftpd.conf Package: ftp (client) Two types of login: (a) Anonymous login: Anyone can login using the username “anonymous” or “ftp”, with password field blank. Here the user will be restricted to…


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Bind DNS Service

DNS is a structured database system that maps a computer’s fully qualified domain name into an IP address. Computers in a network use IP addresses to locate and connect to each other, but IP addresses…


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Linux SWAP Memory

Listed delow is the procedure to create a swap space in Linux: # fdisk /dev/sda : Create a partition in Linux # mkswap -v1 /dev/sda10 : Make and format swap partition using this command #…


redhat

Redhat Linux User Administration

User ID = uid. The uid of root is 0. UID from 1 to 499 is reserved for system services such as the user apache, nagios, etc The first user created by root will always…


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Redhat Package Manager (RPM)

Set of binary files, which are compiled programs. This is similar to add/remove programs in windows. RPM is used to manage installation packages including installation and un-installation. The database that contains information of all rpms…


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Linux File Attributes

Listed below are few attributes that can be assigned to a file: # chattr +i /etc/passwd : i = immutable (cannot remove, edit, rename or move) # chattr -i /etc/passwd : Remove the above attribute…


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RedHat Linux FSTAB

Syntax:   Mount options: rw x ro : Read only / Read & write exec x noexec suid x nosuid auto x noauto : Should this device be mounted in boot-up automatically or not user…


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Linux File System Management

Disk Druid: The only tool used for partitioning management at the time of installation Partitioning management utilities available after installation: fdisk parted sfdisk Total partitions allowed is 63. From the fifth, it will be extended…