Tagged: CentOS

Setting Up Infiniband in Centos 6.7

Installing Infiniband Drivers In Centos/RHEL, software support for Mellanox infiniband hardware is found in the package group “Infiniband Support”, which can be installed with yum: $yum -y groupinstall “Infiniband Support” This will install the required kernel modules, and the infiniband subnet manager opensm. Several optional packages are also available that make configuring and trouble shooting the network easier: $yum -y install infiniband-diags perftest gperf inifiniband-diags is a network diagnostic package containing useful analysis tools such as ibping and ibstat. perftest...

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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 have 6 nodes with the following IPs and hostnames. 128.197.115.158 buhpc1 128.197.115.7 buhpc2 128.197.115.176 buhpc3 128.197.115.17 buhpc4 128.197.115.9 buhpc5 128.197.115.15 buhpc6 Now, we edit every node’s /etc/hosts file. For all...

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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 ¬†Munge Install Slurm Use Slurm Cluster Server and Compute Nodes I configured our nodes with the following hostnames using these steps. Our server is: buhpc3 The clients are: buhpc1 buhpc2...

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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 Boot Order Let’s say that all I want to do is boot the machine and install a new operating system. I have my trusty CentOS 7 Bootable USB installer drive...

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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] HTTP Error 404 – Not Found To fix the error: yum clean all yum update Now try again: yum install vim The command should continue normally.

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