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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Secondary floating IP on TUN/TAP interface

I'm currently working on a HA Cluster implemented using Corosync 2 and Pacemaker and I've run into a network limitation beyond my control that prevents me from implementing floating virtual IPs. Now ...
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1answer
843 views

Creating a stable, auto-scaling app server cluster

I have two servers, each running anywhere from 50-100 different legacy webapps, written in languages ranging from PHP to Python to Ruby-on-rails to NodeJS. We're wanting to kill off these machines ...
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3answers
72 views

Web-based System High Availability [closed]

I'm a SysAdmin in one of the construction sites in a remote place. There is no reasonable internet speed can be reached there except a poor 3G/4G signal coverage which provide the users with ...
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1answer
65 views

A server cluster for static files

I apologize in advance if this question may (by necessity) be somewhat broad. I will try my best to keep it in the format of a valid question. I am currently setting up a backend for serving large ...
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1answer
703 views

redhat cluster failover not working (corosync [TOTEM ] Retransmit List)

I'm using following: [root@kpdbm01 ~]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 6.5 (Santiago) [root@kpdbm01 ~]# uname -a Linux kpdbm01 2.6.32-431.20.3.el6.x86_64 #1 SMP Fri ...
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1answer
78 views

Avoiding a Single Point of Failure with link aggregation

I have a requirement for a system with no Single Point of Failure. The client have offered two Ethernet cables per server. Each of the servers will connect into their network, however I want to ...
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0answers
190 views

RabbitMQ - How I do configure servers for zero-downtime upgrades?

Having read through the docs and RabbitMQ in Action, creating a RabbitMQ cluster seems straightforward enough, but upgrading or patching an existing RabbitMQ cluster seems to require the whole cluster ...
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1answer
432 views

iptable CLUSTERIP doesn't work

We have some requirements which explained here. We tried to satisfy them without any success as described. Here is the brief information: Here are requirements: High Availability Load Balancing ...
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1answer
183 views

Multiple Postgres Servers (one writer, multiple reader) with Shared Disk

Here's the scenario: One shard disk (Gluster) Multiple Postgres servers Requirements: Use the shared disk to store the database files Use a configuration which provide maximum efficiency ...
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17 views

Are there any tools/APIs to check consistency of a windows cluster?

Things to be checked: Directory structures (recursive, with any attributes and properties) Configuration (equiv and partial conf, format specific or generic, with regex) Registry (presence of keys, ...
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1answer
161 views

What are the options for a HA system?

I'm looking into creating a HA Linux machine for my client's website. What are the main options I have, or a place/article where I can find out more? I would LOVE if it was a single-image, too, so ...
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1answer
69 views

Is MOSIX the easiest way to build a redundant system?

I'm trying to figure out the easiest way to build a server with HA. I looked into Linux-HA, Heartbeat, Mesos. I then found MOSIX. I don't know if it's a thing from the past that no one uses, but ...
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1answer
210 views

slaves get a connection timed out with hdfs

I have 3 node instances - master, slave1 and slave2 SSHing between these nodes works fine. Here is the processes that starts on each node when I say ./sbin/start-dfs.sh master: SecondaryNameNode ...
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2answers
206 views

New 2012r2 hyper-v cluster, GUI or server core? [closed]

I have not worked with a Server Core install before. We will soon be moving from old hardware running Server 2012 (with GUI) for our hyper-v cluster to new hardware and plan to install Server 2012r2. ...
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2answers
195 views

Setting up Windows Server 2012 Cluster for distributed computing with Matlab

My aim is to setup Matlab properly for distributed computing on many physical nodes. What have I done? I have installed Windows Server 2012 r2 on my local network server, installed Failover Cluster ...
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1answer
252 views

Building Windows server cluster hpc

I'm trying to set up a Windows Server cluster with a head node and 2x compute nodes. So far, i've managed to install : (thanks to this tutorial http://msdn.microsoft.com/en-us/library/jj884142.aspx) ...
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1answer
177 views

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
627 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
539 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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1answer
499 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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1answer
78 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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1answer
60 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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25 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
491 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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1answer
192 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
66 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
93 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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311 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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0answers
98 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
359 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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2answers
309 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
427 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
101 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
291 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
92 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
170 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
81 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
64 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
767 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
78 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
179 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
211 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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688 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
3k 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
536 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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1answer
1k views

Does CoreOS have a cluster aware job scheduler?

Ive been checking out CoreOS and I'm impressed. Before I found CoreOS I was looking at the Mesos/Marathon/Chronos stack as a "cluster kernel". Given the following comparison: init.d == ...
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61 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
144 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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1answer
463 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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1answer
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. ...