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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MySQL Server 5 with Galera on Debian [on hold]

i have installed Debian 7.7 with mysql-server 5.5.34-25.9 and galera 25.2.9. all working fine, my Cluster is running perfectly. for load balancing i use ha_proxy. now i have a few questions: 1) if ...
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0answers
12 views

CoreOS cluster for development / testing [migrated]

I'm setting up a CoreOS cluster and want to write a bootstrap script which all developers can run to get a local virtual cluster running. Mostly I'm wondering about etcd, how I can pre-set a few ...
0
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1answer
9 views

Clustered Apache 2.4 LoadBalancer displays no content on /balancer-manager

I have a Clustered Loadbalancer (pacemaker, corosync, apache 2.4) on CentOS 7. There are two configuration files, one for the actual balanced site and one for the balancer-manager. When I access the ...
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0answers
6 views

Parallel Distributed Filesystem like Gluster on Solaris 11 or Zpool mirroring with Solaris HAStoragePlus

I'm building a proof of concept lab at work I'm looking to provide HA storage with two solaris cluster nodes. ZFS is a must in this situation and I need Solaris 11 for the Proprietary features. Disks ...
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0answers
24 views

Monitor network statistics with vnstat on CoreOS?

I notice that vnstat isn't installed on CoreOS. Is there a comparable way to monitor network usage on a CoreOS cluster? Certainly one could run vnstat through a Docker container but I assume that ...
2
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1answer
28 views

Using a JBOD for redundant NFS

I have a Xyratex sp-2224 JBOD enclosure (dual controller) and a pair of Dell servers with SAS HBAs installed that I'm looking to utilize in a redundant NFS cluster. The hardware isn't what I'm ...
3
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0answers
26 views

Test-Cluster Powershell cmdlet List vs Validate

The Powershell cmdlet Test-Cluster queries a myriad of data and performs validation tests which it wraps into a pretty report. If you run Test-Cluster -List you get a list of item's you can ...
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0answers
16 views

Can Windows Cluster Aware Updating be configured to allow for downtime?

I thought I'd ask here before giving up completely on this. We have a Windows 2012 Cluster with two nodes and quorum type as "Node and File Share Majority". Failover is not allowed to happen ...
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1answer
29 views

apache proxypassreverse ServerName not working

I have a secondary development wordpress site. (Centos 6.6 x86 ,LAMP) Since the size of the site is growing. (300GB+). Now I divide it into 3 server. domain: www.example.com server1 46.192.22.01 ...
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1answer
41 views

centos single domain multiple server

I have a secondary development wordpress site. (Centos 6.6 x86 ,LAMP) Since the size of the site is growing. (300GB+). Now I have 3 server totally. domain: www.example.com server1 172.192.22.01 ...
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0answers
39 views

Migrating windows server 2008 r2 hyper-v cluster to Server 2012 r2

I did some browsing of the existing articles regarding this question but I couldn't find it so I apologize if I simply missed it. My current setup: 1 x 2008 R2 Hyper-V Cluster 3 x Windows Server ...
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25 views

PBS, adding job - job added, seems that it didnt run at all

First of all, Im very new to clusters and PBS systems. I was told to prepare a simple script (which I did): #PBS -S /bin/bash #PBS -o host_out #PBS -e host_err #PBS -q batch hostname date exit 0 ...
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1answer
41 views

High Load Website. how to load balancing? [closed]

i have the following problem: i have two servers (intel xeon 3,4 GHZ with 32GB RAM and RAID 10 (4x1TB Enterprise Harddiscs). all servers are installed with vmware esxi 5.5 (free). webserver, ...
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1answer
33 views

How to setup a group profile based for terminal server via LDAP?

I have 4 terminal server "they are clustered together." All of them have the same specs and same configuration. and have Windows Server 2008 R2 installed on them. All users are using LDAP to log in. ...
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2answers
19 views

Rsync through secure head-node on storage cluster

I wish to use a specific head-node as contact address for my rsync backups, I do no wish to have the backend accessed directly, as it is not as hardened, nor as compatible with the rest of my ...
0
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0answers
26 views

mkfs.gfs2 failing silently on centos7 cluster?

I'm building a test cluster using centos7 and pacemaker, with shared storage on GFS2 over clustered LVM. I've set up a 2-node cluster, dlm and clvmd, both nodes can see the clustered logical volumes. ...
2
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1answer
47 views

How do I set the pacemaker cluster name with pcs?

I'm running two pacemaker clusters on the corosync stack on CentOS 7 with all packages up to date with the distro release/updates packages. Both clusters shows no cluster name with the command pcs ...
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0answers
9 views

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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24 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 ...
1
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1answer
66 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 ...
2
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1answer
66 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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23 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* -> ...
1
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2answers
191 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
132 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
70 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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121 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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1answer
64 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, ...
1
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1answer
42 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. ...
1
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1answer
94 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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0answers
134 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 ...
0
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26 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 ...
0
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1answer
30 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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0answers
20 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 ...
2
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1answer
168 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 ...
0
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1answer
47 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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0answers
28 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
234 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
62 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 ...
0
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1answer
38 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 ...
1
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1answer
270 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 ...
0
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1answer
50 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
69 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 ...
0
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1answer
136 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 ...
0
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1answer
50 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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0answers
13 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, ...
2
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1answer
134 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
44 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 ...
0
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1answer
66 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
123 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. ...
1
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2answers
91 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 ...