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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Heartbeat token failed

I have a new one today : this ! root@lab-web2:/etc/heartbeat# systemctl status heartbeat ● heartbeat.service - Heartbeat High Availability Cluster Communication and Membership Loaded: loaded (/lib/...
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I need simple key-value or SQL DB with master-master replication

I'm creating self-hosted DNS-service, that can be run by any user on it's servers. The purpose is to parent-control of the available websites and block adverstments and phishing sites by publicly ...
MihanEntalpo's user avatar
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60 views

2 laptops and a Raspberry Pi = General purpose cluster? [duplicate]

have a few old laptops and some raspberrypi's and was wondering if it would be possible to cluster them together for general tasks/3D modeling? im not asking if this is practical. im asking if its ...
Ayden Quinn's user avatar
1 vote
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Kubernetes Environment Setup on VirtualBox to learn CI/CD Pipeline (DevSecOps)

I am just planning to learn K8s. I am interested in learning about its interconnected technologies, such as the CI/CD pipeline and devsecops. I know all of them are broad topics. But I believe the ...
zakadmin's user avatar
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Druid coordinator cannot talk to the rest of the cluster

I'm deploying a 5-KVM cluster with Hadoop, Spark and Apache Druid for testing purposes, and I'm stuck on an issue about Druid. The running cluster is organized as this: hadoop-master: also hosts ...
Juliano B. Nequirito's user avatar
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1 answer
312 views

Samba mounts hangs the system

I set up a cluster using pcs with 2 nodes + quorum [root@konor2 etc]# pcs status Cluster name: wildflycluster Status of pacemakerd: 'Pacemaker is running' (last updated 2023-06-01 09:52:35 +02:00) ...
Ondřej Žižka's user avatar
2 votes
1 answer
52 views

Managing raid6 device with pacemaker

I am setting up 4 hosts, each exporting one local storage device over iscsi with target. Every other hosts imports it such that each host has concurrent access to all 4 each storage devices. I built a ...
Nykau's user avatar
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Why does 'module load intel' fail to load libfftw3?

I am in a cluster (centos) trying to run a program (pw.x) that requires loading three modules: intel, impi, and quantum-espresso. Now, I am getting an error saying pw.x: error while loading shared ...
Abdul Muhaymin's user avatar
1 vote
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294 views

How can I add 2 missing nodes to a galera cluster that has one node that is accepting reads and writes?

I am running a galera cluster with 3 nodes, having 3TB of data. Last night due to a short power cut and a faulty UPS I completely lost 2 of the nodes and everything in /var/lib/mysql folder. At this ...
netrangermike's user avatar
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AWS EKS Cluster : InvalidParameterException: Unsupported Kubernetes minor version update ,Gitlab CI, Terraform

The following errors occur every time I run the pipeline │ Error: error updating EKS Cluster (business-staging) version: InvalidParameterException: Unsupported Kubernetes minor version update from 1....
sam23's user avatar
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How to sync UIDs and GIDs across multiple machines with minimal impact on users' experience?

I have two workstations, WS 1 and WS 2, and a server, S, all running Ubuntu 22.04. These machines were previously managed independently, so users could have accounts on some or all of them, and ...
Matt's user avatar
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Home server with different OS's instead of multiple PC? [closed]

I'm just thinking about that instead of buying powerful notebooks and PC-s for my family members is that possible to create just one powerful PC, with the different OS preinstalled on it, and just ...
Korte Alma's user avatar
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81 views

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 ...
xiaohuamao's user avatar
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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
variable's user avatar
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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 ...
choseph's user avatar
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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 ...
rdaniel's user avatar
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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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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 ...
Chris Parker's user avatar
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211 views

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 ...
user2561523's user avatar
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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 ...
StackedClusterHelp's user avatar
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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 ...
Jeremy's user avatar
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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 ...
ghidalgo's user avatar
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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=,...
user1447888's user avatar
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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 ...
Aviraj Mehta's user avatar
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2 answers
2k views

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(...
Becky Heath's user avatar
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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?
Rageful's user avatar
2 votes
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883 views

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: [...
Fawzi Masri's user avatar
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44 views

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"...
Marc's user avatar
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35 views

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 ...
koenig's user avatar
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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 ...
user1551817's user avatar
1 vote
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42 views

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 ...
uraphaelp's user avatar
1 vote
1 answer
64 views

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 ...
chilipepperhott's user avatar
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1 answer
350 views

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 ...
Daemach's user avatar
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2 votes
1 answer
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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 ...
Himsara Gallege's user avatar
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0 answers
199 views

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/...
shambakey1's user avatar
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1 answer
221 views

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 ...
user1083325's user avatar
1 vote
0 answers
33 views

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 ...
Vikas's user avatar
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1 answer
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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 ...
Lithilion's user avatar
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1 vote
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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 ...
Mike van Eckendonk's user avatar
1 vote
0 answers
380 views

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 ...
pToker's user avatar
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3 votes
2 answers
7k views

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 ...
Iago Carvalho's user avatar
1 vote
2 answers
22k views

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 ...
Tushar Sinha's user avatar
1 vote
0 answers
24 views

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 ...
DingOps's user avatar
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1 vote
1 answer
865 views

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 ...
Dazul's user avatar
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1 answer
339 views

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 ...
user1018847's user avatar
4 votes
0 answers
87 views

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. ...
Ketan Maheshwari's user avatar
0 votes
1 answer
433 views

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/...
Juan H. Veras's user avatar
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1 answer
96 views

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 ...
M.Woo's user avatar
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1 vote
1 answer
950 views

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 ...
Kévin Azoulay's user avatar
1 vote
0 answers
116 views

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 ...
michi.0x5d's user avatar