Yum Detailed configuration according to specific requirement: Introduction: YUM (Yellowdog Updater Modifier) is the package manager which contains the RPM package files for Linux. RPM package file is a Red Hat Package Manager file that enables easy software installation on Red Hat/CentOS Linux. YUM Repositories hold RPM package files and enable download and installation of… Read More »
A must have handy tool for Linux Admins: Knoppix Knoppix is Linux Live CD, with a collection of GNU/Linux software, automatic hardware detection, and support for most of the graphics card, sound cards, SCSI and USB devices and other peripherals. Knoppix can be used as a Linux demo, educational CD, rescue system, there is no… Read More »
In this example’s iam checking the servicename “iptables” Method 1: Using the service name Example: #service iptables status Output of the above command #iptables(pid 3243) is running… Method 2: Using init.d scripts from the /etc/init.d folder Example: #/etc/init.d/iptables status Output of the above command #iptables start/running, process 3231 Method3: Using status command Example: #status iptables… Read More »
Portnumber……..Service 22…………….SSH 25…………….SMTP 23…………….TELNET 53…………….DNS 80…………….HTTP 443……………HTTPS 110……………pop3 465……………SMTP(SSL) 143……………IMAP4 993……………IMAP4(SSl) 2082…………..cpanel 2083…………..cpanel(SSL) 3128…………..Squid 3306…………..MySql 5432…………..PortgreSQL
tcpdump is a powerful command-line packet analyzer, its an excellent way to capture raw traffic and then run it through various tools later. Example to use tcpdump & exclude my ssh session traffic. tcpdump -i eth0 -s 1500 port not 22 Example to skip additional ports including ssh port: tcpdump -i eth0 -s 1500 port… Read More »
/bin – This directory contains most non-privileged system commands such as ls, mkdir, rm, etc. /boot – Contains the systems boot image, boot loader, and the kernel /dev – Contains Symbolic links to system devices such as optical and removable drives /etc – Contains all system configuration files and most configurations for installed packages /home… Read More »
Boot Process Very Brief :1 As The Linux Machine is switched ON: 1. A boot loader finds the kernel image on the disk, loads it into memory, and starts it. 2. The kernel initializes the devices and its drivers. 3. The kernel mounts the root filesystem. 4. The kernel starts a program called init. 5.… Read More »