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 […]
RHEL7
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 […]
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 […]
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 […]
RHEL 7 – Accessing the Pacemaker WEB UI (GUI) – Part 11
Pacemaker offers web based user interface portal to manage the cluster. It also provides an interface to manage multiple clusters in single web UI. We can’t really say that WEB UI has all the options to manage the cluster. I would say that command line is much easier and simple when you compare to GUI. However , […]
RHEL 7 – Pacemaker – Configure Redundant Corosync Links on Fly– Part 10
Corosync cluster engine provides the reliable inter-cluster communications between the cluster nodes. It syncs the cluster configuration across the cluster nodes all the time. It also maintains the cluster membership and notifies when quorum is achieved or lost. It provides the messaging layer inside the cluster to manage the system and resource availability. In Veritas cluster , this functionality has […]