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Howto to setup Unix/Linux SSH key authentication

Howto to setup Unix/Linux SSH key authentication

We normally setup ssk key authentication to automate some of the jobs. If you have more than few hundred of servers and if you need to login reguarly, then better to have SSH key setup. You don’t need to enter password all the time.

* Creating keys * […]

Linux Bonding

Linux Bonding

Iinexpensive way to double up Ethernet interfaces to get more more bandwidth and reliability is called Ethernet bonding. While Gigabit Ethernet is all exciting and the hot new fad, you can get a lot of mileage out of using Ethernet bonding to give your existing gear a nice boost without spending much extra […]

Check Uptime on multiple hosts

If you want to find out up time on multiple hosts. You can use the following script. It’s a simple script, but will do your job. Enjoy


PWD=`pwd` SERVERS=`cat $PWD/server_list` USR=”userID” LOG=”$PWD/uptime_report” >$LOG

for hosts in $SERVERS do echo “——————————–” >>$LOG echo “* HOST: $hosts ” >>$LOG upinfo=`ssh $USR@$hosts uptime` echo “$upinfo”>> $LOG […]

How to check filesystem type

Linux has different types of file system. If you want to find what type of file system is using, then you can use mount command.

[root@superhost ~]# mount

/dev/mapper/VolGroup00-root on / type ext3 (rw) none on /proc type proc (rw) none on /sys type sysfs (rw) none on /dev/pts type devpts (rw,gid=5,mode=620) /dev/sda1 on /boot […]

RHCE exam preparation

If you are preparing for RHCE exam, here is some information: If you have any experience, feel free to share with us.


This guide provides information candidates may use in preparing to take the RHCT or RHCE exam. Red Hat is not responsible for the content or accuracy of other guides, books, online resources, […]

LVM (Logical volume managerment)

VM (Logical volume managerment)

A physical disk is divided into one or more physical volumes (PVs), and logical volume groups (VGs) are created by combining PVs.

Advantages of using LVM: 1. Logical volumes cab be resized while they are mounted removing the downtime associated with adding or deleting storage from a Linux server.

2. Data […]