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…
Linux
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…
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…
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 Linux User Administration (RHEL 4)
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…
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…
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…
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…
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…
Installing and Configuring Spamassassin to work with Postfix SMTP server
Email spam, which is also know as junk email, are identical email messages sent to several email recipients. This could be emails sent by companies for marketing purposes, email sent bring user to phishing web…