Are you a system architect ? Are you planning to convert the physical servers to VM ? If yes, perform the IOPS test on the physical machines prior to migrating it to VM. If you have test virtual machine in the targeted VMware infrastructure, perform the similar IOPS test to compare the results. If the […]
Redhat-LINUX
How to Rebuild Hardware RAID from OS level ?
How to rebuild the hardware RAID from the operating system ? Is it possible ? Yes . Using the MegaCLI or LSIutil , we can re-build the hardware RAID for Non-OS disks from the OS. In my case , We have lost the one of the HDD which was part of RAID 0 . It contains […]
GHOST GLIBC LIBRARY VULNERABILITY – Redhat
The another heartbreaking news for Linux administrators and users. The serious vulnerability has been detected on the Linux glibc library and they named this vulnerability as “GHOST” .The GNU C Library (glibc) is an implementation of the standard C library and a core part of the Linux operating system. This vulnerability allows hackers/attackers to take complete control of the […]
Shellshock bug – vulnerability on Bash shell
Millions of computers are using bash shell (command interpreter ). New security flaw has been found on bash(Bash Code Injection Vulnerability (CVE-2014-6271) and it allows attackers can take the system control remotely. Heartbleed wave was just over on last april (Openssl vulnerability ).Is Shell-shock hurts more than Heartbleed ? Off-course Yes. Heartbleed was all about sniffing the system […]
Openssl Heartbleed bug on Solaris and Linux
Most of the system administrators and developers are re-directed to fix the openssl’s most threatening bug which is named as heartbleed .Two years ago , openssl has added new extension called heartbeat. Heartbeat actually keep the session alive for a bit ,so that communication will not be broken.Where as in typical SSL, connection will be […]
How To Increase Ulimit Values in Redhat Linux ?
Shells like bash/csh/ksh are responsible to provide the control over various system resources to the user. Otherwise, one normal user may utilize the complete system resources and system won’t be available for other users. So setting the limit to users is very important and you need to be very careful before granting shell limits to […]
What is XFS ? The Default Redhat Linux Filesystem
XFS(Extend File system) is a default root filesystem in Redhat Linux ES 7 onwards. This shows redhat has plan to shift from ext filesystems. XFS filesystem is originally developed by Silicon Graphics. XFS is a highly scalable, high-performance file system compare to ext4 and it supports up to 16 exabytes filesystem and 8 exabytes files. XFS supports metadata […]
Linux – Performance Issues Troubleshooting
When it comes to performance issues on any operating systems ,then you need lot of patience to troubleshoot it before contacting the operating system vendors.Here we are going to see how to troubleshoot the Redhat Linux performance issues. The performance issue mainly raises due to system resource shortage. If the application is not properly configured according to the system […]
How to Find Out Linux CPU Utilization?
Due to huge resources demands from the newer applications , anytime your Linux box in to CPU bottle neck.As a system admin, we need to find out who and what has occupied the system CPU’s.To free up the CPU usage , you may need to contact the owner of the process and it most likely […]
Linux- How to Install Redhat Cluster Software ?
I have been trying to post about redhat cluster from quite long time.But today only I got a time to write about it. Redhat Linux become quite popular and most of the low end and mid-range server are migrating from Unix to Redhat Linux.Once of the recent survey stated that RISC servers(Oracle’s SPARC/IBM’s POWER) shipment is keep on reducing every year and […]