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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2
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3answers
34 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 ...
4
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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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0answers
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 ...
2
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0answers
23 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 ...
0
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1answer
17 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 ...
1
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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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0answers
24 views
+50

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 ...
0
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0answers
16 views

cluster server between two networks with connectivity of 95% of times [closed]

I have a server, now I want to cluster it between two networks, that 5% of times this two networks are disconnected from each other. I don't know what's happened in this interval. I read some about ...
0
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1answer
41 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 ...
0
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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
0
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1answer
20 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 ...
0
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0answers
10 views

SQL Server 2014 HA Setup [closed]

Hi i am trying to find the best way to make our new SQL cluster we have 2 Nimble Sans with 10G link in 2 datacenters and a SQL server at the to datacenters and i will like to make a SQL cluster where ...
1
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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. ...
0
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1answer
15 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 ...
0
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0answers
29 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 ...
3
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1answer
3k views

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: ...
1
vote
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 ...
4
votes
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 ...
0
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4answers
388 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 ...
5
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2answers
157 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 ...
1
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0answers
19 views

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/ ...
3
votes
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 ...
6
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2answers
19k 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
votes
1answer
20 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 ...
0
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0answers
14 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 ...
2
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0answers
33 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 ...
1
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1answer
31 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 ...
0
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2answers
1k 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 ...
0
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0answers
15 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 ...
0
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1answer
48 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 ...
-2
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0answers
28 views

single server implementation for scraping 1.5billion urls in 24 hours [duplicate]

I have a list 1.5 billion urls, where I want scrape content off them. To get that data it takes .5sec on each url to get the data which is essentially a line of data like: Date, id, name, # of ...
5
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3answers
18k 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 ...
0
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2answers
26 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 ...
0
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1answer
52 views

Passing SAN Storage to Virtual Machine in active/passive HA Cluster

I need to attach a fibre channel SAN disk to one virtual machine that resides on an active/passive cluster (pacemaker, corosync). As it is the backup storage, corruption has to be strongly avoided. ...
3
votes
0answers
43 views

RabbitMQ two node high availability cluster intermittently breaks with Veeam backup jobs

The environment consists of two 2012R2 Virtual Machines running RabbitMQ in high availability (ha-all) on their Queues. I use Veeam to create snapshot backups that are sent offsite as part of the DR ...
0
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0answers
13 views

PowerHA 7 for AIX 6.1: Modifying the IP source for outgoing packages

I've clusterized a server which has ip address 10.10.10.10/24 (example ip) For that I added two new nodes with ips 10.10.10.11 and 10.10.10.12 and changed the ip 10.10.10.10 to the service IP ...
1
vote
1answer
34 views

ceph - can't start osd on rebooted cluster host

I've rebooted the server (one of ceph's hosts). Started the cluster, but the osd, that's on the host, which was rebooted is down. The osd's # is 2, so when I try: sudo /etc/init.d/ceph start osd.2 ...
1
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0answers
9 views

Opendaylight Cluster : Error resolving artifactorg.jolokia:jolokia-osgi:jar:1.1.5:Could not transfer artifact

I'm using the integration distribution of Karaf (0.4.1-Beryllium) to deploy a 3 node cluster with Opendaylight Controller. After using the deploy.py script and checking all the configuration files on ...
0
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0answers
30 views

windows 2012 r2 guest OS cluster in SUSE KVM environment steps

We are trying to configure the windows 2012 R2 guest OS cluster in SUSE KVM environment we are getting message no disk were found on which server we need to perform cluster validation test. As we ...
0
votes
2answers
75 views

window server 2012 r2 clustering - shared storage required or not

I just came to know that we can setup a 2 node window failover cluster without using shared storage (SAN) In that case, how does services running on 1 node failover to another when their data is not ...
0
votes
1answer
46 views

Can't start VM OpenNebula

I have 3 nodes with CephRBD + OpenNebula + Corosync + Pacemaker + Galera + crmsh. Software: OpenNebula 4.14.2, CentOS 7.1 All works, but when I instantiate VM, a get an error and VM in PENDING ...
1
vote
4answers
65 views

Good generic term for a 'domain' or 'network boundary'

I'm trying to find a term...and its harder to find than I thought. Given a group of computers are within a network boundary, and have a set of user accounts (system admins) setup to oversee computers ...
-1
votes
1answer
24 views

Servers, cloud and network

I need so help so I have few questions. I work in small company and we are going to be buying one or two servers for our needs. We are in area that isn't well equip with internet (only ADSL or WiMAX) ...
0
votes
0answers
14 views

Rabbitmq clustering - Client configuration

Let's say I have setup a rabbitmq cluster on node1 and node2. Node1 is master and other is slave. Now how should we configure the clients? Do we need a load balanced hostname which will distribute ...
3
votes
2answers
82 views

Hyper-v failover or replication in 2 node cluster

I'm trying to setup some form of a failover cluster between 2 hosts. I want to be able to have high availability on 2 of my VMs. It seems that some form of shared storage is required for this to work ...
1
vote
1answer
29 views

Why won't 'docker run' on a swarm show output from a command?

I've successfully setup a Docker Swarm cluster consisting of one master and two nodes. Everything works as expected, only one thing deviates from the documentation. According to the docs (look for ...
2
votes
1answer
29 views

In a Pacemaker cluster, is there any way to set start-failure-is-fatal on a per resource basis?

I've got it set cluster-wide currently, but I'd really like it to be set to 'true' by default and false for only my Slave DRBD resource. Using Pacemaker 1.1.12 and Corosync 1.4.8.
1
vote
3answers
76 views

Must all nodes of an Elasticsearch cluster be identical?

In an Elasticsearch cluster, must all nodes be identical i.e. having the same: Operating System Amount of RAM CPU speed and number of cores etc. or is it allowed for the nodes to be different? ...
2
votes
2answers
41 views

Proper way to distribute binaries to linux cluster

I recently had a disagreement with my boss over the proper way to distribute executable binaries across compute nodes in a Linux cluster. All the compute nodes are running the distro and the same ...
0
votes
2answers
124 views

DRBD - no resources defined

I have some problems getting a drbd cluster running. When I want to start creating my storage, i get the following error: root@raspberrypi-ha1~# drbdadm create-md drbd1 no resources defined But ...