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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PostgreSQL replication techniques

I pretend to install a HA postgres 9.3 cluster, as far as I see here there are a lot of options. I count with hardware to support shared disk or distributed file systems but as far as I see using ...
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18 views

pulling latest software version onto new server

Currently, we have a cluster of around 60 machines. When we perform a software push, we push to a central distribution server, then use lsyncd/rsync to distribute the files to each machine in the ...
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clustat : How to get a list of logical services included in a cluster service?

When I use the command clustat, I get a list of cluster services like sOPS sQRY sBCK How can I get a list of services like dns, filesharing, ... running inside a cluster service?
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8 views

Windows Server 2012 Cluser on VMware esxi 5.5: Rebooting passive node causes san reset on active node

I'm running a SQL Cluster on windows server 2012 on VMWare 5.5 and find that when I restart the passive node to install a patch, the active node is affected. This appears to be covered by the kb ...
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1answer
26 views

Scaling a web application horizontally in Tomcat (load balancing / clustering)

I develop a simple REST-style web application consisting of 2 basic modules. Module#1: server exposing REST web services, stateless, deployed in Tomcat Module#2: REST client There is one Tomcat ...
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29 views

Get-Cluster cmdlet fails when using -Name param

Summary When I call Get-Cluster powershell returns the name of my cluster. For simplicity sake, lets call it Cluster1. If I call Get-Cluster -Name Cluster1 it fails with an error. Error: ...
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Howto use some variables in Haproxy error pages [closed]

I need change haproxy error page (for example 503.http) with haproxy variables. If backends down, haproxy must return page with http code 503 and text: Host $hostname is down, where $hostname - ...
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6 views

Configuring Maui/Torque to map different queues to same nodes based on availability

I want to setup Maui/Torque to have queues mapping to specific nodes. I currently have 2 queues (main, priv) and 2 nodes (node1, node2). What I would like to achieve is the following: *queues* -> ...
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2answers
184 views

Best ways to discover servers in a public cloud? [closed]

I want to make a ubuntu server image to run in a public cloud that discovers when other servers from the same image come online. I came up with this list of solutions, but I'm not sure what is best? ...
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2answers
80 views

Centos 6.5 configuring HA cluster

I need to configure HA cluster using 2 computers. But I've got a problem, when I'm trying to start a heartbeat service it starts but throws an error. Here's the error message: Starting ...
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1answer
57 views

High Availability/Failover hardware hookup

I'm learning about clustering and high availability techniques, and stumbled upon an article about configuring a network with a pair of servers, using DRBD for replication and heartbeat for monitoring ...
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82 views

Virtualization-(Cluster) with KVM/libvirt on top of a FC SAN

I'd like to set up a 2-node HA-Cluster based on Ubuntu and KVM running about 30 VM's. Both nodes are connected to a HP MSA(5TB) via Fibre Channel. Multipathing's already working and the nodes are able ...
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28 views

Cassandra 2.x - cluster does not rebalance after adding new nodes

I had 3 nodes, all with ~550GB, and added 4 more. I hoped that data would migrate on its own from old servers to new ones. Unfortunately after one day, data seems to stay in old places. In parallel, ...
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1answer
14 views

Setup MongoDB on MS Azure virtual machine to access it from an azure website

I have setup a MongoDB replica cluster on 3 virtual machines (Ubuntu 14), on MS azure cloud. The mongodb cluster has been setup with MMS (https://mms.mongodb.com amazing tool btw) and it works fine. ...
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1answer
66 views

Persistent Disk Name in RedHAt Cluster on VMWare Workstation-10.01

I am trying to implement a 2 Node REDHAT HA cluster. The following is my environment. VMWare WorkStation 10.01 Node-1 >> CentOS-6.3 x86_64 Node-2 >> CentOS-6.3 x86_64 Node-3 >> CentOS-6.3 x86_64 [ ...
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51 views

Is it viable to create CoreOS VMs with Proxmox?

I want to create clusters of CoreOS VMs on our machines. We are already using Proxmox to manage our KVM and OpenVZ containers on these machines, so I am wondering if it is practical to create and ...
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24 views

MSSQL High Availability Advice Required

I'm looking to implement a high availability SQL installation using MSSQL2012 or 2014 and there is 1 part of this I'm not sure about. I plan to have a SQL cluster at site a, and a secondary SQL ...
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1answer
18 views

pg_createcluster ssl cert behaviour different for 9.1 and 9.3 on Debian Squeeze

I think i found a bug in pg_createcluster when creating a 9.3 cluster. At first, my configuration: Debian Squeeze with PostgreSQL 9.1 from squeeze-backports and PostgreSQL 9.3 from apt.postgresql.org ...
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17 views

Glassfish 2.0 - per node JVM config

I have a Glassfish (2.0) cluster with two nodes. I want to pass some extra JVM settings to a single node only. Is this configurable? At least from the console I see, this selective configuration is ...
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1answer
95 views

Unresponsive ESXi 5.5 server

I have a host that is part of a 4 host cluster in HA. Sometime yesterday I noticed the host stopped responding, in the vsphere console it shows up greyed out as (not responding) and all VMs on it ...
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1answer
37 views

redhat, multipath on cluster node display different result

I've a cluster with two nodes installed with "RedHat Entreprise Linux Server 5.6" If I execute "multipath -ll" on them, I do not get the same result. I've checked within "multipathd -k" with "show ...
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21 views

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
131 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
61 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
31 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
159 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
45 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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42 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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83 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
36 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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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
128 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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37 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
38 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
101 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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68 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
74 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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78 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
179 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
134 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
90 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
50 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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37 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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19 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
112 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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52 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
37 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
61 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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157 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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43 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"> ...