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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13 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
8 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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0answers
17 views

Centos Cluster Two Nodes only

I am trying to create a two node cluster with Centos for the purpose of availability and redundancy. Currently I have two servers with ricci, lucy, conga and kvm installed. I am reading as many ...
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0answers
9 views

Can we implement Least Connection algorithms simulation using NS-2? [on hold]

I am searching for this algorithm to make a simulation on ns2 but on my friend google has not to much information.
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0answers
29 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
15 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 ...
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7 views

Handling time based events within a cluster [closed]

I have a Java app which loads up records from a database and then executes something every x mins/seconds, in a one machine environment, this works fine, however if this was to be run in a cluster, I ...
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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 ...
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0answers
8 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
19 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 ...
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0answers
19 views

Beginner explanation on MySQL cluster? [closed]

I am a beginner on MySQL and so far I have a web application with only one MySQL server running. I want to add more MySQL servers and started to read about MySQL clustering, but have a problem with ...
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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 ...
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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 ...
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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2answers
22 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 ...
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1answer
41 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. ...
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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: ...
3
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0answers
32 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 ...
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0answers
8 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 ...
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1answer
22 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 ...
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0answers
6 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 ...
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0answers
21 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 ...
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2answers
69 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 ...
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1answer
27 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 ...
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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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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 ...
4
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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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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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1answer
22 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) ...
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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 ...
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: ...
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11 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
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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 ...
3
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2answers
63 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 ...
0
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1answer
20 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
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1answer
24 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.
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3answers
70 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
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2answers
38 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 ...
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2answers
100 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 ...
2
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2answers
3k views

Redis high availability and load balancing

I'm using Redis for some time and now we want to move to a redundant cluster which would be fault tolerant, highly available and load balanced. I principally use Redis for some PHP web application ...
2
votes
2answers
36 views

Pacemaker and DRBD on Hyper-V

I need to setup two-node Web cluster for Apache web site. I have Hyper-V infrastructure and only two nodes. The points are load-balancing and high availability. I installed and configured two VMs ...
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0answers
16 views

Performance concern with hosting large clustered DBs on VPS cloud servers

I wonder if anybody else bumped into this issue? You get a couple of beefy 12-core VPS instances in some cloud like DigitalOcean and set up a database on them in "active-passive" cluster ...
0
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1answer
34 views

CIB not supported: validator 'pacemaker-2.0', release '3.0.9'

I am trying to make two node clusters with pacemaker and corosync. When I want to change config with crm I get the following error: CIB not supported: validator 'pacemaker-2.0', release '3.0.9' ...
0
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1answer
53 views

Postgres server not starting on drbd + pacemaker

I am trying to bring up the postgres server over ubuntu 14.04 with drbd and fiesystem. Service state as below: Last updated: Mon Mar 14 01:16:45 2016 Last change: Mon Mar 14 01:05:53 2016 via ...
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0answers
9 views

Is it possible to run CMAN without configfs?

I run a custom 3.18.x kernel that does not have configfs enabled. Is it possible to run CMAN cluster management without configfs? If necessary it would be much easier for me to rebuild CMAN than it ...
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0answers
18 views

Trying to get qsub to work on my cluster

Trying to get qsub to work on my cluster (single node right now but more are coming) So far trying to submit with qsub was returning error: commlib error: got select error (Connection refused) ...
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0answers
68 views

Cluster red hat add a default route , no RIP protocol is enabled

We have a couple of Red Hat Enterprise linux server with clustering uname -a: Linux deda-ora1 2.6.18-194.el5 #1 SMP Mon Mar 29 22:10:29 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux rpm -qf ...
2
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1answer
3k views

Failover Cluster Client Access Point Only Responds to Pings on the Owner Node

Background We're running two VMs (Windows Server 2012 R2) on Azure with SQL Server installed, set up as an availability group. We also, of course, have another VM as a dedicated DC. These are all ...
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1answer
40 views

Openstack cluster for parallel execution?

I want to try Ubuntu OpenStack with Metal-as-a-Service (MaaS) for web application purposes. I would be using Apache2, PHP, MySQL and Postgres. If I got 5 or more machines setup and installed all ...
3
votes
3answers
4k views

mod_jk produces Error smh errno=13

I am trying to use mod_jk for load balancing. Loadbalancer: 172.17.8.189 (HTTPD+mod_jk) Node1: 172.17.8.193 (apache tomcat instance 1) Node2: 172.17.8.196 (apache tomcat instance 2) I checked my ...