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

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Is there a way to check resource utilization on a cluster running SLURM?

Not sure if this question fits better here or at Unix.SE but I figured it feels more appropriate here. I am running some computation-heavy research on a national cluster which uses SLURM for ...
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1answer
2k views

Intel MPI Gives 'channel initialization failed' error (mpirun)

I'm trying to setup a small cluster consisting of 3 servers. Their hardware is identical, and they are running CentOS 7. I'm using Intel's cluster compiler and MPI implementation. Everything is setup: ...
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1answer
2k views

Apache Kafka consumer client connecting to Apache Zookeeper: EndOfStreamException

I get an error when trying to 'consume' messages from Kafka (2.9.2-0.8.1) with a Zookeer stand-alone (3.4.5). You can see the source code below as well as the error message and logfile from Zookeeper. ...
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5answers
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What's the best way in Windows to manage multiple ssh sessions (via putty?) to look at clustered servers?

There's a tool called cssh for linux that has simular use to what I'd like to have on Windows. Basically I'm logging into servers that are identical to each other and I'd like to be able to type the ...
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1answer
1k views

Pacemaker/corosync timeout before resource transfers

This seems like a simple question, but one I can't seem to find the answer for despite going over the pacemaker documentation multiple times. I've got corosync set up with pacemaker to share a ...
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19 views

ElasticSearch Cluster fails 5 minutes after starting on Azure

I am trying to build an ElasticSearch cluster on Azure. I have done it successfully for testing purposes with 3 VM's under the same virtual network. It functioned very good. Because of my ...
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1answer
2k views

Tomcat mod_jk cluster skip 404 http status

I am trying Tomcat Clustering with mod_jk for months and so far not so bad but facing a problem during deployment. I am using FarmDeployer to copy and deploy the WAR to other nodes in the cluster but ...
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2answers
52 views

Replacing failed hardware in a hyper-converged cluster node [closed]

Is it possible to replace failed physical components (such as disk, RAM, or power supply) in a hyper-converged node (such as VXrail or Nutanix) without taking the node offline?
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1answer
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clvmd problems during the RHEV cluster deployment

We are deploying Red Hat Enterprise Virtualization cluster and we faced a problem attempting to start clvmd service after the lvm partition creating. The following has been completed successfully: ...
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1answer
19 views

MongoDB, How can I migrate database to new cluster with higher version without an outage

We are having our mongodb cluster at AWS and our production DB mongo is very old - we are still using version 2.6 then latest version at the moment is 3.2.7. We need to upgrade mongodb binaries to the ...
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19 views

Private IP Addresses not shown for blades

I have 2 IBM bladecenters with a total of 9 blades. I am currently setting them up to do cluster simulations. I installed ubuntu 14.04 on all of them. Also, the blades are not connected to the ...
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27 views

Can't ssh from nodes to VM Proxmox 4.2

SOLVED: I edited the /etc/ssh/sshd_config and changed "PermitRootLogin" to "yes" instead of "without-password". For whatever reason by default it is set to yes for each node, but in the VM it's set ...
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2answers
3k views

How to set up Zabbix to monitor SQL Server Failover Active-Passive Cluster?

It should be simple, so it is just most likely my approach being totally off and someone will hopefully prod me into the right direction. We have a Zabbix 2.0.3 server instance set up monitoring a ...
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1answer
14 views

How does spinning up a node within a cluster reduce CPU load?

I have a VM (representing a baremetal server) with a load balancer and a cluster of 3 container nodes that requests distribute to. Say some threshold is hit and I scale up a 4th node in the cluster. ...
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2answers
2k views

Apache load balancer for mod_proxy_wstunnel?

We are in the process of developing a JavaEE 7 application to be deployed on JBoss/Wildfly that will make extensive use of Web Sockets. We're using mod_proxy_wstunnel for web socket support, and we'...
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2answers
840 views

Failover Cluster Quorum Failing

I have two nodes which boots from iscsi to implement windows 2008 cluster. And I'm using disk majority option as quorum over iscsi. But when the quorum's iscsi connection failed(May be san server ...
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2answers
85 views

Unable to communicate with pacemaker host while authorising

I'm trying to configure pacemaker cluster with two hosts, I'm using two centos 7(CentOS Linux release 7.2.1511 (Core)) virtual machines. What I did so far: I installed packages: yum install ...
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1answer
31 views

Error AMQ4036 when trying to add a QueueManager to a Cluster in IBM MQ?

I am trying to setup a MQ Cluster that has the following config There are 3 host machines, ubuntuvm-1, ubuntuvm-2 and ubuntuvm-3 ubuntuvm-1 has one Full repository queue manager and one partial ...
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2answers
68 views

How can I run Spark on a cluster using Slurm?

I have written a program example.jar which uses a spark context. How can I run this on a cluster which uses Slurm? This is related to http://stackoverflow.com/questions/29308202/running-spark-on-top-...
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0answers
30 views

“Authetication key already exists” error while adding computer to cluster proxmox

I had 2 computers running proxmox which were set up in a cluster called "cluster1". For simplicity the computers were named computer1 and computer2. computer1 was the primary, and computer2 was added ...
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2answers
1k views

Novell Clustering Problem

I am trying to cluster 3 servers to then mount an NSS. I have all 3 configured and ready to roll. The only problem is none of them are apart of any cluster. When I run the: "cluster join" command I ...
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3answers
107 views

How to SSH to all instances in EC2 cluster?

I just created a cluster using spark-ec2. I followed steps here http://spark.apache.org/docs/latest/ec2-scripts.html . Now I want to configure all slaves (150), i.e., install Java 8 for both master ...
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2answers
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Load Balancing and Clustering using mod_proxy_ajp on Apache HTTP Server 2.2.21 and Tomcat 7.0.23

I've been struggling to make load balancing and clustering working using these combination: Apache HTTP Server 2.2.21 (httpd-2.2.21-win32-x86-openssl-0.9.8r) using mod_proxy_ajp with sticky session ...
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2answers
1k views

What's the best way to manage product images in a Magento Cluster?

I'm running Magento CE on multiple web node. The Admin Backend is always running on the same server, so all the images are uploaded on this server. On my
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1answer
17 views

Kubernetes cluster ip not answering

We've setup a kubernetes cluster with 3 masters and 3 workernodes. Then we've installed the kubernetes-dashboard which failes because it can't connect to kubernetes (api-server). It's looking for ...
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21 views

How can I launch graph500 benchmark on nVidia GPU with CUDA?

How can I launch graph500 benchmark on nVidia GPU with CUDA? There is written: https://devblogs.nvidia.com/parallelforall/gpus-graph-predictive-analytics/ At the IEEE Bigdata conference later in ...
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1answer
74 views

Postgresql replication with pgpool or pgbouncer

I'm looking for a good configuration for a postgresql replication with a robust failover strategy (self hosted). Actually, I configured two postgresql instances in master / slave with repmgr. Now, I ...
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2answers
1k views

Is there a way to get a list of Hadoop cluster machines from one of the data nodes?

I have access to a data node in a Hadoop cluster, and I'd like to find out the identity of the name nodes for the same cluster. Is there a way to do this?
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33 views

Rancher usage of mariadb galera cluster

I was deploying mariadb galera cluster at ranhcer environment and have a problem of node hosts: 6/3/2016 7:11:39 PM160603 15:11:39 mysqld_safe WSREP: Recovered position 00000000-0000-0000-0000-...
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1answer
9k views

How to get cluster information remotely via Powershell?

I've been trying to find a good way to gather various pieces of a windows cluster setup remotely, preferably via WMI, as we are not yet at a point where Powershell remoting is implemented (and I know ...
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3answers
762 views

Emulate a SMP server with a Linux Cluster?

Is it possible to combine a few machines into a cluster and have it appears as a single server? For example, with such a cluster we can run a 32-thread CPU-bound process on 8 quad-core machines. Are ...
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3answers
89 views

HyperV Failover Cluster (with/without CSV)

Been browsing a few websites, and it seems right now all hyper-v clusters are build on CSV ( clustered share volume ). I have a current setup (2 node window failover cluster). I have 2 vms running ...
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2k views

Windows Failover Cluster - Create Cluster Wizard: error occurred while creating the cluster

I have 2 identical Windows Server 2008 R2 servers which I am trying to setup a failover cluster on. The "Validate a Configuration" passes, but the actual creation process produces an error: An error ...
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32 views

LSF nodes die after exhausting all memory

I have a LSF cluster and experience the following problems. After some time, random OS processes start to die (they become zombies or defunct), and the LSF nodes do not report any troubles back to ...
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1answer
31 views

Slurm: Have two separate queues for GPU and CPU-only jobs

At the moment, we have set up Slurm to manage a small cluster of six nodes with four GPUs each. That has been working great so far, but now we want to utilize the Intel Core i7-5820K CPUs for jobs ...
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29 views

How to allocate drives with SLURM

I need to share drives (SSDs or hard drives) in a compute node. The Generic Resource (GRES) Scheduling is a Slurm module designed to manage different kind of resources. For instance it gets a plugin ...
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1answer
63 views

Four node asterisk cluster

I have a question regarding Asterisk servers. I have a client that have two locations connected with fiber optic. On both locations they have PRI ISDN-s. On one location there are 4 PRI ISDN, and on ...
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1answer
44 views

Unison / file syncing between servers without using root account

I have setup 3 servers one with a load balancer and the other 2 will host the websites files and I have a replicated MySQL database on both too. I have installed ispconfig on both and it's set to ...
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40 views

How can I configure a single-node cluster on RHEL 7?

For particular purposes, I'd like to know how can I configure a RHEL 7 HA cluster with only one node (of course, no HA will be available in this scenario). The following article says that single-node ...
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4answers
391 views

Apache clustering

I know how to run two or more tomcats under one apache server. I want to know how to run two or more apache servers in a cluster and run my application. I know it's possible. can someone suggest a ...
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2answers
173 views

Windows 2012 R2 Hyper-V cluster without shared hardware

I have several servers with local SATA/SAS RAID arrays. I would like to run there virtual machines with some level of automated failover - sync VM to secondary node in 1 minute interval and automated ...
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Percona XtraDB Cluster 5.6 does not start

All the good days. I want to run for test purposes Percona XtraDb Cluster on ubuntu 14.04. The basis here took these two articles https://habrahabr.ru/post/152969/ https://www.percona.com/doc/...
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2answers
20k views

How to setup STONITH in a 2-node active/passive linux HA pacemaker cluster?

I am trying to setup an active/passive (2 nodes) Linux-HA cluster with corosync and pacemaker to hold a PostgreSQL-Database up and running. It works via DRBD and a service-ip. If node1 fails, node2 ...
0
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1answer
23 views

Mongodb sharded cluster architecture

I have a mongodb cluster on aws. In order to reduce network latency I want to have multiple shards in different regions. In each region there will be the application nodes that connect to the ...
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0answers
39 views

Lustre alternative for 70-node scientific cluster

Our lab has a cluster with 70 compute nodes 4 IO nodes Infiniband QDR interconnection 12T disk array accessed using IB SRP protocol The major application is debugging and running MPI-based ...
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1answer
74 views

Is there a difference between LVM and HA-LVM or is it just how you use it.

I am studying up on HA Clusters using pacemaker and corosync. The Red Hat documentation treats LVM, HA-LVM and CLVM as separate topics. I understand the added features and benefits of CLVM over HA-...
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24 views

mysql ndb cluster - Management node and data node go down together

I have an NDB scenario with the following details: Blade 1: VM 1 : Management Node (Active) VM 2 : Data Node VM 3 : SQL Node Blade 2: VM 1 : Management Node VM 2 : Data Node VM 3: SQL Node If ...
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1answer
62 views

Windows Server 2012 WSFC and NLB together

I am looking to run a combination of WSFC and NLB in my service stack. I have a stateless service that I want to load-balance with NLB, and several "singleton" services that need to be run with fail-...
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3answers
20k views

How does one cluster multiple machines to act as one to run multiple virtual machines on this single-seeming machine? [duplicate]

How does one take multiple computers and make them act as one, such that all their processors and memory are combined now and you are running any application such that yo are running them on a single ...
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2answers
29 views

Is it necessary to secure TCP traffic for PHP FPM over shared private VPS network?

There are lots of recommended practices and tutorials for securing various components of a LEMP/LAMP stack when running in a cluster whose private network traffic is shared by other, potentially ...