Questions tagged [cluster]

A cluster consists of a set of connected computers that work together so that they can be viewed as a single system.

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Why a non-root installed software can work across the whole cluster?

I recently installed a new python3 and another python package locally in my account folder on a cluster with a dozen of nodes (each node with several cores). I originally thought that I can python3 ...
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GlusterFS cluster in unknown state after mirror-link (bond) went offline

I'm currently running two GlusterFS servers that have two bonds. bond0 is connected directly to the other GlusterFS server via 2x 10 GE fiber (mirror-link) and bond1 is attached to the storage network ...
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What does 50/50 mean in cluster quorum?

What does 50/50 mean in cluster quorum? Link to table: https://docs.microsoft.com/en-us/azure-stack/hci/concepts/quorum#cluster-quorum-overview
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Pacemaker Check if master

I have a few shell scripts running while loops and they're extremely expensive because they check to see if the system is master by running "pcs status". Does anyone else know of a cheaper ...
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Ansible playbook hangs in interactive mode

If I run the command (redis-cli --cluster create 192.168.1.10:6379 192.168.1.11:6379 192.168.1.15:6379) from the host(192.168.1.10) it prompts me for "yes" and it's working but in ansible ...
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Connecting two desktops by an infiniband interconnect

I am a scientist working in a high performance computing project(the computational programming aspect) and I have no idea of networking or networking hardware required to answer my question. A ...
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sharing usb ports of a worker node to the master node in a cluster

i want to run the turing pi as a desktop computer. but i heard that the usb 3 ports are connected to node 4 (https://www.jeffgeerling.com/blog/2021/turing-pi-2-4-raspberry-pi-nodes-on-mini-itx-board). ...
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Connect Portable Cluster to Different LANs Dynamically

I just got a job that requires me to relocate every few months. I can't take my homelab rack with me so I'm building a small portable ITX TrueNAS cluster (microwave size). I don't know much about ...
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NTFS Sectors per Cluster for 2MB cluster size

Formatted a disk partition using DiskGenius for NTFS with (maximum) cluster size of 2048KB (2MB). I notice Windows itself also can format NTFS with this cluster size in Disk Management. This setting ...
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How do I send files from my personal computer to a cluster?

I know to send files onto my laptop from the cluster, I do something like: scp username@remotecomputer:/path/to/file/you/want/to/copy where/to/put/file/on/laptop But what about uploading a file from ...
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Excel - Stacked Cluster X-axis label has extra space at end?

I don't know why my chart has an extra line in my last Year of data... I added an extra space at the end for a buffer for spacing/presentation, but can't figure out why that line is still there! Any ...
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DNS Configuration: server can't find ****: NXDOMAIN

Sorry if the question title is not descriptive enough, I'm a noob @ this kind of Linux sysadmin stuff Hi for a college project I have to configure a Oracle RAC environment, for this task I chose this ...
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OpenMPI configuration and tuning manual

Preface I am a sysadmin of a small insitute cluster at a university, with a 10Gbps ethernet network running SLURM where the default MPI implementation is MPICH (with MVAPICH 2.3b being the newest ...
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Using rpm to install sw locally on RHEL cluster [duplicate]

I am new to shared Linux environments and have always had root privileges on my own machines, working without these privileges has been an exercise in how to go about working in a local setting. I am ...
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Secure a folder in a cluster

I have a folder in a cluster that I want to secure by allowing access to me only (read, write and execute). I am new in using clusters, what are the command lines I can use? I have used umask u=rwx,g=,...
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Can I connect 2 laptops one asus another acer together so they can share their ram

So the issue is I want to run a R code estimating R0 values for a city to find this I run bootstrap simulation of 11000, for the city the code stops as I don't have the required memory in a single ...
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Percentage Overlap of 95% confidence ellipses in a PCA plot

I've generated some plots with the below code: #Remove group label from the dataframe data_just_feats <- data[ , -which(names(data) %in% c("Group"))] # Pca Plot plot_1 <- autoplot(...
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How can I install tree on CentOS cluster?

How can I install tree program on a CentOS cluster where I do not have sudo privileges?
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oVirt hosted engine install error: Failed to verify Power Management configuration

I am new to ovirt and I am trying to install it on minimal-install CentOS 7. I have been able to iron out all the wrinkles to create the host-engine, except for this error: [ ERROR ] fatal: [...
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Let's encrypt, multiple webserver, one certificate

Im searching for a long time now. What is the best way to share a let's encrypt certificate across multiple webserver ? As example for a HA Cluster. One way i tought about was, to create a "dummy"...
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How can I reinstall a Ubuntu with a configuration from a specific point in time?

I am setting up a database cluster on Ubuntu using XtraDB. When I do this I can happily run apt update && apt upgrade -y since this is the primordial server configuration. Now, imagine that I ...
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I want to run software on a GPU in a cluster. Does the software have to be on my machine or on the cluster?

My laptop runs Linux. If I need to run any (deep learning) code on a GPU, I do so on a university cluster that I have access to (which also runs Linux). I want to use a piece of commercially ...
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difference bwtween redis force failover and automatic failover caused by a master down

I want to use go-redis NewFailoverClinet as a client to set data into my database(redis-3.2.6) in a loop. Result shows using command sentinel failover <MasterName> to trigger failover could ...
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Does a kubernetes master node contribute?

Does the master node contribute processing power to the cluster? Can it? I am interested in making a small cluster from old computers at home and I want to know where I should put the most powerful ...
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Windows Server 2016 - how do I migrate non-clustered Hyper-V VMs to a new cluster?

I just created a cluster with a single node to which I need to move all of our VMs so I can rebuild the other server and add it to the cluster. I've set up shared storage and configured hyperv on the ...
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bin file unavailable in Apache Drill

I installed Drill according to Drill Documentation. I have java installed. These are the steps I followed wget http://apache.mirrors.hoobly.com/drill/drill-1.16.0/apache-drill-1.16.0-src.tar.gz Then ...
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Python script fails when submitted to PBS

I'm trying to submit a simple python script to PBS using the command: qsub -l procs=1 -q copperhead test.py, but the command fails with the error file (i.e., test.py.e--) saying: /var/spool/torque/...
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How to use iscsi to share disk which is CSV file system

I want to share folder between some windows server, but I can not use smb(cfs). I want to use iscsi to share disk, but I donot not how to use CSV(cluster share volume) to as they file syetem to avoid ...
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Db Mirror Issue

We are having a Weird issue with the DB Mirroring and to post the the issue I will have to explain our Architecture first. We have a TWO Nodes [NODE 1 and NODE 2] cluster with Two FCIs Installed on ...
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Why does every interface in a cluster of network devices needs its own IP address?

When I have a cluster of i.e. firewalls handling multiple networks, why do they all need their own IP address additionally to the virtual cluster IP address? Isn't this a waste of addresses? EDIT: I ...
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Create a High Avaiebily cluster Centos in NON-Geograpical regions

I have been looking to create an Extreme High available cluster in Centos 7.6. They have to be at least 2 in same data center 3 or more different Non- geographical locations Ability to expand cluster ...
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Pacemaker/Corosync Cluster Monitoring Action keeps failling (Wildfly)

I have a 2-node cluster without STONITH based on the following software: Ubuntu 18.04.1 LTS Pacemaker 1.1.18 Corosync Cluster Engine, version '2.4.3' It is not the first cluster I build but the first ...
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How to cancel a job that is on completing (CG) state?

I normally submitted some jobs using sbatch and canceled some of them after using scancel. However, they are in state CG and I cannot remove the jobs from my list. There is any way to get ride off ...
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ImportError: /lib64/libstdc++.so.6: version `CXXABI_1.3.8' not found

I'm trying to run a deep learning model on a university cluster. When I write the command to run the model, I receive this error. 15CS10019@cpusrv-gpu-112:~/Tushar/Rod-keras_yolo2-master$ python3 ...
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Failed Stackdriver email notification for newly created cluster

I want to create monitoring and altering notification whenever someone creates a new k8s cluster. Method: Find methodName: google.container.v1beta1.ClusterManager.CreateCluster Create Log metrics ...
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Galera cluster is still accepting writes on a single node when 2 of 3 nodes are down

I am running a 3 clusters galera database, and during redundancy tests, I saw that if I shutdown properly 2 of 3 nodes, the last one still accepts writes, even being the only only one up. I am not ...
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Removing cluster node from always on cluster

I have an alwaysOn configuration for SqlServer 2012 that is installed in two node windows cluster. We had a disk failure on the second node, and there is no way to recover it, so I should run a new ...
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4 votes
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Why is nodes=n:ppn=m request not being properly honored by torque/moab?

On an inherited cluster that runs torque/moab scheduler, I find that the nodes:ppn requests are not properly honored. The nodes are allocated as per the value of ppn regardless of the value of node. ...
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Openshift (OKD) 3.11 - Resuming cluster installation

I'm installing OKD 3.11 using the ansible playbooks. Running the playbook deploy_cluster.yml fails every time because the script /etc/NetworkManager/dispatcher.d/99-origin-dns.sh messes up my /etc/...
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Is it essential to use clusterwares for active-active cluster using SAN?

I want to use SAN storage as shared disk for two active nodes running on Linux, and I want to use it as raw device (without file system). At first I thought it would have no problem if the disk is ...
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YARN 3 and Spark: allocate a GPU

I can't find the working Spark option to require executors with a GPU. I'm trying to setup a HADOOP cluster in order to run Machine Learning algorithms on available GPUs via Spark. So far I'm trying ...
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1 vote
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Over 100% objects are degraded, how this is possible?

Situation Running a really small ceph cluster: with three nodes (each containing mon, osd and mds) an admin VM (containing also a mgr-service) a pool replicating three times Just to play around ...
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Can I combine the computing power of two laptops for everyday use? [closed]

I have two laptops by different makers, both running Windows 10. Neither of them is comfortable enough for MS Office use or normal Web browsing. One has a better display, a quicker but smaller SSD, ...
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No output and error file after running job in TORQUE

I installed mpich-3.2.1, torque-5.1.0 and maui-3.3.1 on Debian 9. I have one master and one node. I use NFS file system for sharing, and ssh passwordless. When I run a job with a user that this user ...
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Terminating a SLURM zombie job

I have encountered the following problem during a first hard shutdown of the department cluster I am in charge of. The system is running SLURM 17.11 and using MariaDB/SQL to store accounting data. To ...
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pipenv module install fails with lmod modules enabled

Recently I've been experimenting with cluster computing/administration. I've got a small RasPi cluster with shared storage. On the NFS storage, Python 3.6 is installed to a folder. I'm using LMOD to ...
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PostgreSQL Native Replication | Master - Master

I am configuring a high availability environment with Debian 9.4 machine, in which I have a Heartbeat working and need to include native PostgreSQL 9.6 replication, but by default this method of ...
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4 votes
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Configuring Heartbeat to run shell script

I set up a high availability system with Heartbeat, I wish that when there was a drop in the main cluster and the secondary cluster was activated, Heartbeat start in it and execute a shell script. ...
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3 votes
1 answer
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Hyper V fail over cluster

I have two Hyper V host. One with Intel adapter and other with Broadcom. Is this configuration supported.? While running validation test I am getting error message. Node 'HOST1.poc.lab' is missing a ...
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Run the CPUMiner-multi mining package with the Mosix clustering package

When I run the CPUMiner-multi package for 'xmr' digital coin mining in Ubuntu Linux under the Mosix-4.4.4 clustering package with two nodes $ ./mosrun -e ./minerd -a cryptonight -p stratum+tcp://...
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