This article will provide the step by step procedure to recover the GRUB on REHL 7 / CentOS 7. GRUB corruption / lost is one of the most common issues on Linux servers/workstations. The possible reasons for grub corruption could be due to bad disk/bug on the firmware or powered off the system abruptly. Systems ships […]
Redhat-LINUX
How to find Linux is under BIOS or UEFI mode ?
How would you find your Linux server booted in BIOS mode or UEFI mode? What’s the main difference between BIOS and UEFI? Servers which had shipped prior to the 2011 year have only BIOS firmware installed by default. BIOS is legacy firmware used only on X86 hardware and its 16-bit code. BIOS will take more time for […]
How to Upgrade/Update Redhat Linux to Specific version ? RHSM
This article will talk about how to update / upgrade Redhat Enterprise Linux to specific minor release when you use in Red Hat Subscription Manager. It will also discuss about how to prevent YUM from updating kernel and packages but only to the security updates. In many cases , you might need to tie with specific version […]
How to Merge/Update Redhat Linux YUM Repositories ?
Redhat Linux YUM repository is useful for installing packages , updating the packages and upgrade the operating system with automatic dependency selection method. In larger environment , we need to setup the repository via HTTP to make the YUM repository to be available over network. At the same time , you might have different RHEL […]
How to Upgrade Red Hat Enterprise Linux 7.0 to 7.5 ? What’s New in RHEL 7.5
Redhat Enterprise Linux 7.5 released on April 2018. Redhat is continuously showing more interest in Microsoft Products integration to increase RHEL foot print in Azure cloud computing platform. Redhat Claims that “Red Hat Enterprise Linux 7.5 brings you enhanced interoperability, storage efficiency on-premise and in the cloud, and multi-platform support for building network-intensive applications, massively scalable data […]
How to fix Meltdown & Spectre Vulnerabilities on Redhat Linux?
Redhat is closely working with Intel and AMD to mitigate the risk of micro-architectural (hardware) implementation issues which are named as Meltdown and Spectre. These vulnerabilities are mostly affecting many modern microprocessors which include Intel, AMD, IBM power and ARM processors. These issues can be overcome by updating Linux kernel, virtualization-related components, and/or in combination with […]
Meltdown and Spectre Vulnerabilities – Big Threats
Meltdown and Spectre Vulnerabilities have made 80% of servers as Vulnerable in overnight, thanks to Google Project Zero team and other security researchers who have brought such a worst vulnerabilities to the world (At least now). Meltdown vulnerability basically melts security boundaries which are normally enforced by the hardware (CPU). Spectre name is based on the root cause, “speculative […]
LINUX – SCSI Device Management – Identifying Devices
This article is going to share very least used SCSI commands on Linux operating systems. These commands will be very useful to identifying SCSI devices and tuneable parameters. There are few utilities which can be used to get the detailed information about the scsi devices. lsscsi is most command tool which scans sysfs pseudo file […]
Configuring NFS HA using Redhat Cluster – Pacemaker on RHEL 7
This article will help you to setup High Availability NFS server using Pacemaker on Redhat Enterprise Linux 7. From the scratch ,we will build the pacemaker blocks which includes package installation , configuring the HA resources, fencing etc. NFS shares are used for setting up the home directories and sharing the same content across multiple […]
Let’s Start exploring the Docker – Container World
Virtualization industry is bringing up many interesting and yet useful products in the market to reduce the IT cost. VMware revolution demonstrated that how to utilize the hardware effectively using hypervisor and other sibling products. Similarly openstack development also going on aggressive pace to reduce the virtualization product cost by utilizing opensource technologies. Docker was no […]