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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Hosting self hosted WebAPI in Windows Failover Cluster

I've got a windows service that is self-hosting the Asp.Net WebAPI. This works great and I can send GET requests successfully. However I am also trying to host this service in a Windows 2012 ...
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2answers
241 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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1answer
239 views

Windows 2012 R2 Hyper-V vs Datacenter edition

We need to deploy a Windows 2012 R2 Hyper-V cluster with 4 physical server. We going to use Datacenter edition licencing, but consider installing the Hyper-V edition on the serveres. Just to install ...
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122 views

Mounted gluster volume only accessible by root

I have a 2-node cluster with each node having two HDDs. The home directory of mpiuser is shared between the nodes via NFS(Used guide here). The 2nd HDD of each node was used to create a gluster ...
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54 views

How do I know which node in a cluster answers?

I have set up an NLB with two servers (nodes) which are running the same service. The filtering is single host, because I don’t want them to run at the same time, because there is data in the cache ...
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44 views

Setup Galera Cluster with two servers

Can I Create Gallera Cluster with two servers ?? Actually I have 6 servers: 2 Server for Load Balancer 2 Server for Apache Or anyone here can suggest me how to create High Availability Web Server ...
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0answers
21 views

How to make shared space from HDDs of nodes in a cluster?

I have a 2-node cluster with each node having two HDDs. I want make a scratch space common to both nodes using the second HDD of each cluster. I mounted the 2nd HDD of master node as /home and have an ...
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1answer
166 views

HPC Cluster (SLURM): recommended ways to set up a secure and stable system

I'm working with a SLURM driven HPC Cluster, containing of 1 control node and 34 computation nodes and since the current system is not exactly very stable I'm looking for guidelines or best practices ...
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66 views

Webmin slave DNS

I setup slave DNS server for my master, I configured everything, all domains was transfered to the slave server, I can add new domain, edit existing domain, but in the logs I've got problems. There ...
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1answer
41 views

Process can't see recently created symlink on NFS

I have a small amount of old ubuntu desktops connected by a switch acting as a mini test cluster. The workers take commands from a master node via the SLURM queue manager. They share a data mount and ...
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1answer
65 views

Creating a scalable back-up cluster with one interface and retention

Currently I'm running a number of back-up servers to back-up other servers with, e.g. b01, b02, .., bn, all with their own IP's, running their own FTP / SSH services. However, I would like to create ...
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178 views

RHEL/Centos 6 Cluster multi-site configuration with Pacemaker and split brain situation

I would configure a 4-nodes cluster using RHEL 6.5 and Pacemaker as reported in the official documentation ...
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54 views

Weblogic Cluster returns URL of dead instance in WSDL

We have a clustered Oracle 11g (in fact an OSB) that exposes a JAX-RPC service. When we call http://host2:7102/Foo/FooSvc?WSDL (host2), we get back: <L5G3N2:service name="FooService"> ...
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4answers
217 views

How do I change multiple linux servers' /etc/fstab simultaneously

We have plenty of linux server that will mount a few linux file server by NFS or SMB using /etc/fstab But manually changing each server's /etc/fstab is very tedious. Is there any way to edit ...
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1answer
142 views

IBM V7000 firmware upgrade effect on mounted LUN

We've IBM storwize V7000 Storage where the firmware is going to be upgraded to latest version.. This will require a reboot to the storage. I've got arround 10 LUN's (almost 10TB) coming from this ...
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2answers
85 views

Adding a 3rd node to an existing DRBD cluster

We currently have a 2 node DRBD cluster running which we would like to add a third node to. I have so far been unable to find any resources on whether it is possible to add a third node to an existing ...
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1answer
70 views

Monitoring heartbeat centos

I am using HAproxy on two servers and for high availability using heartbeat and everything is okay, but I want to monitoring heartbeat I have a long search and get clustat command but can't find it on ...
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1answer
145 views

Riak does not allow to add a node because it is in its own cluster

(this is a repost of my question from stack overflow, it was offtopic there, here is right place to ask it) I was trying to build a Riak cluster on Raspberry Pi. Created an image with Erland and ...
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1answer
55 views

Riak all_nodes_down error but they are up

I built a Riak cluster on three Raspberry Pi computers. vm.args and app.config files are double checked on each node (static IP addresss are correct). All nodes are valid: # ./riak-admin ...
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1answer
91 views

How remote instances work on Coldfusion Clustering?

I have just decided to set up my site using ColdFusion clustering in the staging environment. I need to find out what code adjustments are required when we move to a cluster environment. I have two ...
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1answer
43 views

PostgreSQL asynchronous cluster with partial synchronous commits

We`re planning a complete synchronous PG Cluster with 3 nodes but we asked ourselves if its possible to have an asynchronous cluster with partial synchronous commits. Normally you make your cluster ...
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3answers
60 views

Is it safe to have backup and production servers in the same cluster?

I have two virtual servers maintained by the same provider. I asked them to place them on different physical machines. They told me that they placed them in different nodes of one cluster. I do not ...
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1answer
389 views

Load balancing glassfish v4.0 CLUSTER with apache HTTP server: Location of apache

I am teaching myself to build clustered Java EE 7 applications. I am focused on Glassfish Server v4.0. Based on the official documentation (Chapter 7 page 133) , Glassfish can be loadbalanced using ...
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1answer
64 views

Tomcat cluster - how to verify node starvation?

We have a tomcat cluster with a load balancer (haproxy). As part of our upgrade script we would like to starve a single tomcat in the cluster of 3, wait until all the requests are handled for that ...
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1answer
115 views

Does ColdFusion single server clustering using multiple instances provides any performance enhancement?

I have few doubts regarding Coldfusion clustering. Is there any benefits of Creating multiple instances of a single ColdFusion server, Create a cluster by adding those instances and host the ...
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2answers
122 views

Can I format a Veritas cluster shared volume from windows?

We have a Microsoft Failover Cluster with dynamic disks managed by Veritas Storage Foundation. Today the sysadmins added a new disk for SQL Server but the cluster size on the volume was wrong, so I ...
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503 views

Using Openfire for distributed XMPP-based video-chat

I have been tasked with setting up a distributed video-chat system built on XMPP. Currently my setup looks like this: Openfire (XMPP server) + JingleNodes plugin for video chat OpenLDAP (LDAP ...
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2answers
1k views

Make a Docker application write to stdout

I'm deploying a 3rd-party application in compliance with the 12 factor advisory, and one of the points tell that application logs should be printed to stdout/stderr: then clustering software can ...
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1answer
279 views

IIS Shared Configuration Share for Cluster FTP Service on Server 2008 R2

Microsoft gives the following order for setting up the Clustered FTP (after installing IIS, FTP Service, and setting up your Cluster): Set up a file share that will be used for IIS Shared ...
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53 views

What do I need to increase my processing power?

Ok so I have written this program in Python 2.7 that runs on a desktop machine running Arch Linux. Without getting into the big details, this program takes a data-point, performs a series of ...
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5answers
121 views

send files to dozens of servers quickly

We have a cluster of machines (around 50 and growing). Each machine has a search index that needs to be updated multiple times per day. We currently update the index on each machine individually, but ...
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115 views

Homogeneous cluster versus heterogeneous cluster

By homogeneous cluster I mean a cluster of nodes that all have the same services running. I am trying to set up a cluster of nodes that offer a set of services. The cluster can respond to HTTPS ...
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1answer
163 views

DFS Replication Manager on Failover Cluster Nodes

I currently have a VM architecture setup for high availability / manageability. The one point of failure is that I have a single windows 2008 machine that runs DFS replication across the servers in my ...
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1k 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
64 views

MSTDC in SQL Server 2012 - Windows Server 2012 R2 with high availability

We had implemented SQL Server High Availability on two physical servers over the VPN network. SQL Server 2012, Windows Server 2012 R2. It was noted that, Distributed Transaction was working perfectly ...
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1answer
195 views

Using DHCP, is it possible to obtain an IP address & MAC address for a cluster? [closed]

I know that DHCP assigns IP addresses, but does it also assign a MAC address? Is this a commonly used paradigm for cluster/cloud computing? Perhaps DHCP could be used to dynamically assign a new IP ...
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2answers
128 views

High Low priority queues SGE

I would like to have two queues in a CPU/GPU cluster, one with high priority and one with low priority. Thus, jobs that are submitted in the high priority queue will be bumped to the top of the list ...
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0answers
100 views

How can I run a CentOS (Red Hat) cluster in degraded mode?

I've installed Red Hat's cluster software on an install of CentOS 6.5, and use it to provide redundant routing from one network to another. This works fine, and I have a pair of boxes providing the ...
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1answer
242 views

Beowulf cluster storage setup [closed]

I'm a Computer Engineering student working on a project with a Verari blade cluster, a bit outdated for today standards. I had acquired some Unix experience but I'm not an expert at all. This Verari ...
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0answers
27 views

How to Install CentOS on a Cluster

I want to install CentOS on a cluster with a main node and five identical slave nodes. I have installed CentOS 6.5 on my head node and I have ssh as root. I moved /dev/sda from the first slave to the ...
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21 views

What mysql configuration offers the highest write performance

Which multiple mysql server configuration offers the highest write performance? We are looking at changing a web application which is heavy write and want to know what configuration is going to give ...
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0answers
124 views

starcluster ec2 403 forbidden

I am trying to setup a Hadoop cluster using MIT's starcluster tool, I have modified the configuration file with my AWS information, but am getting the following error message: !!! ERROR - ...
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1answer
329 views

Pgpool configuration with Liferay cluster

I'm using a Liferay cluster connected to pgpool2 and when I run heavy user activity against the web servers I see a lot of exceptions regarding liferay unable to establish a connection to the DB. ...
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67 views

Redundant load balancing using Apache

I have a cluster of 5 application servers with a single Apache HTTP server sitting in front of them acting as a load balancer (using mod_proxy_ajp). This works well, but the problem is that the load ...
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1answer
1k 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
225 views

MariaDB how to handle 2/3 node failure in multi master cluster.

I run 3 node multi master MariaDB galera cluster. It basically works for me how it is. When one node fails, two other work and it's fine. But I'm wondering is there a way for it to keep working on ...
2
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1answer
220 views

How can I store my ElasticSearch indexes/shards?

I'm trying to figure out how can I store the ES indexes. Actually I have two VMs running on 2 ESXi hosts, using 32GB vmdk... Wondering if i could share those data or is it necessary to have duplicate ...
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1answer
89 views

JBOD or RAID on a streaming server setup

Currently my setup is 1 main server which holds all the mp4 videos and 3 other servers which holds portions of this video. The process is: when a user uploads a video, it is stored into the main ...
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2answers
966 views

SQL Clustering or Hyper V Clustering

We will soon be implementing our Dynamics AX installation. Our aim is to have high availability and we are working closely with our implementers. We raised the question to them about SQL and Hyper-V ...
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0answers
345 views

Cannot ping Windows Cluster Nodes with Cluster IP on same subnet

I am facing a strange problem here, I have a 2 Node cluster, Node A and Node B. I cannot ping Nodes one another in MSCS Cluster with the Cluster IP even if they are on same subnet. I can ping one ...