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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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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Trouble switching between servers in a cluster using PuTTy on Windows

I am trying to connect to a cluster and I'm not very experienced in it. I generated the two keys using PuTTy gen and then I tried to connect to the cluster using PuTTy configure. After I logged in, I ...
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Can we run any program in MPI cluster? [duplicate]

I have a few idle desktop PCs (Ubuntu/Intel i5/4GB) which I intend to cluster using MPI. Once clustered can I run any program on these system or is there a need to configure each program to make use ...
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Why is there such a big difference between Size and Size on Disk on External HDD when Internal HDD has same cluster size and no difference [duplicate]

I have two external hard drive from WD Elements connected to a raspberry pi 4 used as a NAS system. The raspberry is running raspbian lite. On my computer running Windows 10, I have an hard drive ...
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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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Running BOINC in cluster computing—Help Wanted

In a magazine I learned how to cluster compute with mpi. I would like to cluster compute BOINC to a) learn about cluster computing and b) help out researchers. But all the magazine showed was ...
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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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throwable caught when submitting- druid coordinator

I have upgraded my druid cluster from 0.12 to 0.16 recently. coordinator-overload log is flooded with bellow exception now. 2019-10-25T16:57:12,257 ERROR [Master-PeonExec--0] org.apache.druid.server....
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What are the difference between NGINX Plus and NGINX Community edition? Doubts about NGINX installation and configuration

I am absolutly new in NGINX and I have the following doubts about this product. I have to create a WSO2 EI cluster (but I think that my doubts are not strictly related to this specific technology) and ...
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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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Deleting AWS EMR Cluster using cli

As the title. I'm running aws emr terminate-clusters --cluster-ids j-xxxxxxx but I'm getting the following error An error occurred (ValidationException) when calling the SetTerminationProtection ...
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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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ZooKeeper with Solr - import configuration

EDIT: resolved !!! schema.xml was bad :D So configs below are valid. I have 3 servers in Zookeper-Solr cluster: - solr-1 - solr-2 - solr-3 Directory structure and configuration on solr-1 : /opt/...
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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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MariaDB/Galera SST sync, foreign key issue?

I am having a bit of an issue with a MariaDB Galera cluster. Its a two node cluster, was going to increase to three soon. Two servers: ptdb01 ptdb02 The ptdb01 server left the cluster for some ...
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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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Databricks: install PYODBC failling on cluster and on random occasions when installing using a notebook

I am using pyodbc in my codes and tried installing pyodbc using PyPI on the actual cluster, however it failed. (DBX cluster runtime = 5.1ML Demo, Python version 3(i.e. 3.5)). To solve this issue I'...
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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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354 views

hat does the message “A processor failed, forming new configuration.” from corosync mean on a RHEL 7 cluster node?

May 7 18:37:11 node2 corosync[12718]: [TOTEM ] A processor failed, forming new configuration. May 7 18:37:23 node2 corosync[12718]: [QUORUM] Members[2]: 2 3 May 7 18:37:23 node2 corosync[...
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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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Rabbitmq with Mqtt plugin is not working on cluster

I have set up 3 node rabbitMq cluster and using it as mqtt broker . So whenever I am publishing a retained msg on on node then ideally it should be replicated through out the cluster nodes. But its ...
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212 views

PMM Status Code 502 (text/html)

We are running a PMM(Percona Monitoring & Management) Server via Docker Container. Recently we have removed pmm-data container directly & again created new container & ran pmm-server ...
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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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183 views

How to setup nodes on EC2 for a SLURM cluster properly?

I have installed a Burstable and Event-driven HPC Cluster on AWS Using Slurm according to this tutorial. I have build/installed OpenMPI on the head node with PMI2 support according to this guide. I ...
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496 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 ...
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Corosync caused a 100% CPU load after a node disappeared. How to fix it?

A general setup (the very first for me) of Corosync + Pacemaker is made upon 4 Virtual Servers with a VirtualIP, a private network is organised with a help of OpenVPN. corosync-2.4.3-4.el7.x86_64 ...
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Hadoop Mapreduce job doesn't start properly

in the last few days I've been playing with Hadoop, and I've been trying to implement the k-meters count (find the absolute frequencies of different words lengths) Everything is implemented following ...
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2k 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 ...
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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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235 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 ...
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142 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 ...
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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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338 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/...
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54 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 ...
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1answer
528 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 ...
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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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1k views

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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1answer
33 views

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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393 views

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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64 views

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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375 views

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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412 views

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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1answer
22 views

Can I make two node Hadoop 2 Cluster on two different VirtualBoxes on two different lap-tops on the same network?

So I have two lap-tops with VirtualBox both running Ubuntu 18.4 and I am trying to set up Hadoop 2 Cluster. One VB to be the master and one VB to be the slave is it possible and how? Because all the ...
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730 views

Lots of disk errors but no hardware alert. Is this hardware related or software?

Summary: Random disks on one datanode of an Hadoop cluster keeps getting read-only. Jobs fails but there is no hardware alert on server. Hello, I am administring an Hadoop cluster which runs on ...