How to install docker on Redhat Linux (RHEL) and CentOS? How to setup the docker environment to start the first container to start exploring the container world? In this article, we are going to demonstrate the docker community edition deployment on RHEL/CentOS. We will also launch the Docker containers to test the deployment. Docker […]
RHEL7
RHEL7/CentOS 7 – Recover/Reinstall GRUB2 with UEFI
This article will provide the step by step procedure to recover the GRUB RHEL7 / CentOS7 which uses UEFI. In last article, we have demonstrated the BIOS-based system’s GRUB recovery. The newer system ships with UEFI firmware and here is the way to identify BIOS vs UEFI on Linux servers. To recover GRUB2 on RHEL7 /CentOS 7 with […]
How to Recover GRUB on RHEL 7 / CentOS 7 ?
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 […]
How to Install Python 3 on Redhat Enterprise Linux 7.x ?
Python is available on most of the operating systems in the world. By default Redhat provides 2.7x version on Redhat Enterprise Linux 7.x. But the new development is mostly happening on Python 3.x version since 2.x is legacy. If you need python 3.x, then you need to install it using the Redhat software repository (if […]
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 […]
RHEL7 – Configuring GFS2 on Pacemaker/Corosync Cluster
This article will briefly explains about configuring the GFS2 filesystem between two cluster nodes. As you know that GFS2 is cluster filesystem and it can be mounted on more than one server at a time . Since multiple servers can mount the same filesystem, it uses the DLM (Dynamic Lock Manager) to prevent the data corruption. […]
RHEL 7 – How to configure the Fencing on Pacemaker ?
Fencing (STONITH) is an important mechanism in cluster to avoid the data corruption on shared storage. It also helps to bring the cluster into the known state when there is a split brain occurs between the nodes. Cluster nodes talks to each other over communication channels, which are typically standard network connections, such as Ethernet. Each […]