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Connecting to Your Linux Instance from Windows Using PuTTY

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1.     To generate an RSA key pair to work with version 2 of the protocol, type the following command at a shell prompt: 2.   ssh-keygen -t rsa [pravesh@localhost ~]$ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/pravesh/.ssh/id_rsa): pravesh Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in pravesh. Your public key has been saved in pravesh.pub. The key fingerprint is: ed:5e:fb:5d:87:a2:12:ac:5d:98:1c:59:df:e3:81:1a pravesh@localhost.localdomain The key's randomart image is: +--[ RSA 2048]----+ |                 | |          .      | |         o . o   | |        o.E o +  | | ...
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Install and configure rsyslog Centralized logging server in CentOS

 Install and configure rsyslog Centralized logging server in CentOS 6.5 In this tutorial we will learn, how to install and configure rsyslog 7.6 version on RHEL 6.5/CentOS 6.5 .The scenario is, install and setup rsyslog Centralized Logging Server in RHEL/CentOS 6.5. All the logs from client servers will be sent to Centralized logging server i.e rsyslog server. Check Pre-installed rsyslog package Step 1: First of all check the rsyslog package is installed in your system.Generally by-default we get rsyslog version 5.x , after minimal installation of CentOS 6.x / RHEL 6.x We will install the latest rsyslog package. At the time of writing this post, rsyslog stable version 7.6 was available. You can find the latest package information from rsyslog official website Note: By default, RHEL 6.x and CentOS 6.x has rsyslog version 5.x. So here we will update the rsyslog with new version. You can get the rsyslog version information, by using below given two commands rpm -qa|grep rsy...
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How to scan new iSCSI disks in Linux ?

How to scan new iSCSI disks in Linux ? 1.First check which are the existing disk available on linux server from fdisk. [root@Centos7 ~]# fdisk -l 2>/dev/null | egrep '^Disk' | egrep -v 'dm-|type|identifier' Disk /dev/xvda: 53.7 GB, 53687091200 bytes, 104857600 sectors Disk /dev/mapper/cl-root: 10.7 GB, 10737418240 bytes, 20971520 sectors Disk /dev/mapper/cl-swap: 5368 MB, 5368709120 bytes, 10485760 sectors Disk /dev/mapper/cl-usr: 10.7 GB, 10737418240 bytes, 20971520 sectors Disk /dev/mapper/cl-home: 2147 MB, 2147483648 bytes, 4194304 sectors Disk /dev/mapper/cl-var: 5444 MB, 5444206592 bytes, 10633216 sectors Disk /dev/mapper/cl-tmp: 2147 MB, 2147483648 bytes, 4194304 sectors 2.Find out how many SCSI controller configured. [root@Centos7 ~]# ls -l /sys/class/scsi_host/ total 0 lrwxrwxrwx 1 root root 0 Dec 11 12:09 host0 -> ../../devices/pci0000:00/0000:00:01.1/ata1/host0/scsi_host/host0 lrwxrwxrwx 1 root root 0 Dec 11 12:09 host1 -> ../../dev...
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