Category: CentOS 7

Setup Hostname without DNS Server on CentOS 7

Let’s say that you have a cluster of 6 nodes and you do not have a DNS server. How do you map the IPs to their perspective hostnames properly so that every node in the cluster can detect the other node’s hostname? We need to bypass the automatic lookup. I...

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How to Mount USB Flash Drive on CentOS 7

In this blog article, I’ll show you how to mount a USB Flash Drive on CentOS 7 terminal. In my case, I needed to mount a USB Flash Drive on my minimal CentOS 7 machine to copy a file to the USB Flash Drive. USB Flash Drive The file system...

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How to Install Ansible on CentOS 7

Ansible is a useful configuration automation software that allows you to automate the setup of your machines. In comparison to other configuration automation out there like Chef or Puppet, I’ve found it to be much simpler to use for cluster setup. Installation First, I normally update the EPEL on CentOS...

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How to Install Slurm on CentOS 7 Cluster

Slurm is an open-source workload manager designed for Linux clusters of all sizes. It’s a great system for queuing jobs for your HPC applications. I’m going to show you how to install Slurm on a CentOS 7 cluster. Delete failed installation of Slurm Install MariaDB Create the global users Install...

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How to Install GlusterFS on CentOS 7

GlusterFS is a scale-out network-attached storage file system. In this tutorial, we’ll be setting up GlusterFS on a cluster with CentOS 7.  Our cluster has 6 nodes connected through a switch. I’ll be using all 6 nodes as servers for distributed replicated storage with opportunity for more nodes to be...

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How to Install Ganglia on CentOS 7

Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. Ganglia is useful when monitoring nodes of a cluster. Setting up Ganglia on CentOS 7 with a bunch of nodes can be confusing. In this blog, I’ll show you how to setup Ganglia and...

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How to Bypass Intel PXE Boot

You might encounter a PXE Boot loading screen on your cluster, but you don’t have PXE Boot. And your network isn’t even configured yet! Many machines built to be part of clusters will pop up to this PXE screen and will loop forever! What do you do?   Change the...

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How to Setup the Intel Compilers on a Cluster

Intel compilers like icc or icl are very useful for any cluster with Intel processors. They’ve been known to produce very efficient numerical code. If you are still a student, you can grab the student Intel Parallel Studio XE Cluster Edition, which includes Fortran and C/C++ for free for a...

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yum [Errno 14] HTTP Error 404 – Not Found

When you run a yum command like: yum install vim You may get the following error: Loaded plugins: fastestmirror http://repo.dimenoc.com/pub/centos/7.1.1503/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 – Not Found Trying other mirror. Is this ok [y/d/N]: y Downloading packages: Delta RPMs disabled because /usr/bin/applydeltarpm not installed. vim-enhanced-7.4.160-1.el7.x86 FAILED http://ftp.linux.ncsu.edu/pub/CentOS/7.1.1503/os/x86_64/Packages/vim-enhanced-7.4.160-1.el7.x86_64.rpm: [Errno 14]...

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