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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Tomcat Clustering With Apache-[warn] proxy: No protocol handler was valid for the URL /. If you are using a DSO version of mod_proxy

I am new to apache and tomcat, and trying to implement clustering with mod_proxy and able get run multiple tomcat instances but got stuck. Here is my config: httpd.conf: LoadModule proxy_module ...
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3 views

SQL alwaysON and WSFC

I have a WSFC configured on 2 (hardware)nodes with SQL AlwaysOn group. The problem is, if the node Where I have created the cluster goes down the cluster is not available for second node and here ...
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1answer
31 views

Merge Live VMware hosts into existing vcenter

We currently have 3 VMware hosts, all running ESXi 4.1. They are all HP DL380 G7's, two of them having dual Xeon E5620 cpus with 96GB RAM, and the third having dual Xeon E5645 cpus and 64GB RAN. The ...
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1answer
30 views

Setting up Windows Server Failover Clustering in SoftLayer

I'm trying to create a Windows Server Failover Cluster. I've already create Active Directory successfully. I'm currently at this stage: On the screenshot, the blurred place has subnet/network id, ...
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1answer
38 views

Microsoft windows 2012 clustering

I have 2 hardware servers with Microsoft windows server 2012 R2 standard. One of them is our production server and running on it our application. I was thinking to configure the second in a cluster to ...
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1answer
36 views

Cluster computing over Wifi

I was recently reading about Cluster Computing and how it used Ethernet as preferred interface. My question is why not use WiFi? It has a 300Mbps (802.11n) throughput and without all the wiring ...
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23 views

2012R2 Cluster - Add host without downtime

Essentially just want to confirm my current thoughts - have a 3-node 2012R2 Cluster. We are replacing two of the hosts. At the point when you add a new host to the cluster and run the validation, the ...
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40 views

Best scenario for global data replication and distribution between multiple servers [closed]

I need to store and serve about 30TB of data (for now) and the number will increase pretty fast. I also have to keep costs low, so I will have servers with no RAID at all. Instead data should be ...
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10 views

Deploy from Eclipse to Tomcat cluster

I've the following cluster configuration in server.xml on each server (there are two): <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"> <Deployer ...
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27 views

Watchguard HA Cluster Issue

I am trying to setup a Watchguard Firecluster in our rack and am having issues with the setup. We have two Ethernet up links provided by the Data center that go to their VRRP/HSRP configured routers ...
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16 views

Diskless cluster using Perceus: nodes don't boot

I'm constructing diskless cluster using Perceus. Few days ago, I succeed Clustering using Perceus. Nodes are booted well and i can use ssh to nodes. Even i run mpi program. Today, I tried to ...
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30 views

How can I create a small cluster and include non dedicated servers?

We want to set up a small cluster, witch will store some databases and testing services at first. The cluster will initially launched on 8 dedicated servers (HP G3/G5). 6 of the servers in in the same ...
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64 views

Failover pacemaker cluster with two network interfaces?

So, i have two test servers in one vlan. srv1 eth1 10.10.10.11 eth2 10.20.10.11 srv2 eth1 10.10.10.12 eth2 10.20.10.12 Cluster VIP - 10.10.10.100 Corosync config with two interfaces: ...
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1answer
75 views

Split brain on DRBD and Pacemaker cluster

I want to put into your consideration the following situation that is currently happening on our active-passive cluster (DRBD, Pacemaker, Corosync, PostgreSQL) OS: Ubuntu server 14.04 x64 DRBD: 8.4 ...
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103 views

monitor of systemd resource with pacemaker & corosync returns “not running” when cloned while it is

The setup: - OS: CentOS 7, latest versions op Corosync, Pacemaker & PCS - two node active/active cluster with a virtual IP - on both nodes Exim is running for outoging mail (SMTP), nothing special ...
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2answers
33 views

WildFly 8.1 domain mode with shared properties

I'm trying to configure a WildFly 8.1 cluster and I have not found any satisfying answer for sharing common property files. In standalone mode I've added some property files to the configuration ...
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51 views

Configuring Proxmox Cluster Storage

We are configuring proxmox on our servers at two locations each location has; 1 x hp c7000 enclosures with 16 blades 1 x hp proliant dl585 We also plan to add a 24TB SAN to each location. We are ...
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1answer
68 views

What is the proper way to shutdown an iSCSI target with connected clients?

iSCSI with two DRBD primary nodes is a bad idea to use if the two paths get concurrent write requests. But I am thinking about using this idea as backend storage for an ESXi 5.5U2 host. I already did ...
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1answer
26 views

why configure cluster nodes to reboot when out of memory

I have access to a research HPC cluster which is configured so that if your job tries to use more memory than the node has available the node crashes and automatically reboots. This appears to be ...
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1answer
74 views

Does hardware RAID1 offer significant advantages to S/W RAID in a computer cluster that's highly redundant?

I'm about to set up a Linux cluster of 5 physical server nodes (more nodes to be added later, probably). the cluster will be managed by Proxmox (and yes, it works in software RAID) shared storage ...
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1answer
52 views

Windows cluster has lost or discarded the CLUSDB

Both nodes of a two node windows failover cluster on 2008R2 have lost the CLUSDB file. I think this happened because an inexperienced admin came to a cluster with a reserved disk issue and ...
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2answers
47 views

What is optimal sql server cluster storage solution?

I have been assigned a project where sql server is running on a single server with single raid 1 volume. This setup has worked fine until hardware failure resulted in about a day worth of downtime ...
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22 views

JBOSS cluster cannot access master or Slave individually

I have setup a JBOSS cluster using two VM nodes as Master and Slave. The Mod-Cluster-manager console shows that all the traffic has been redirected to only the master Both the JBOSS nodes are running ...
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1answer
102 views

Apache Tomcat 7.0.57 Cluster & mod_proxy / mod_proxy_ajp

I have set up an Apache Tomcat Cluster with an Apache HTTP server and load balancing on CentOS 6.6 the following way: + 1 VM running HTTP server & 1 Tomcat instance (used for deployment, not ...
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45 views

Clustering with Jboss EAP and Load balancing with Haproxy

I'm doing load balancing with HAProxy and use JBoss EAP as application servers. The Haproxy server is configured to route incoming requests to the application servers. How can I integrate Jboss EAP ...
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40 views

Direct server return loadbalancer for mariadb galera cluster with 2 networks

Is it possible to configure LVS (keepalived) loadbalancer with direct server return (DSR) for 2 leg network setup? The desired architecture is as follows: mariadb galera cluster, where each node has ...
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61 views

Windows 2012 R2 Hyper-V cluster without shared hardware

I have several servers with local SATA/SAS RAID arrays. I would like to run there virtual machines with some level of automated failover - sync VM to secondary node in 1 minute interval and automated ...
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35 views

Python libraries slow to load from NFS mount point

Several of our computers are diskless, and they load their Python libraries from an NFS mount point across the network. This means it can take up to three minutes to start up a Python process that ...
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1answer
122 views

CoreOS Cluster DNS setup

I'm unsure of how to setup DNS for a coreos cluster. Currently I have all of my api instances behind a haproxy load balancer and a DNS A record which points to the (elastic) ip of the load balancer. ...
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1answer
188 views

Redis/Sentinel cluster failover results in “failover-abort-not-elected master”

I have a 2 node Redis cluster set-up. [master] 192.168.56.102: Redis Master (:6379), Redis Slave (:6380), Sentinel(:26379), Sentinel#2(:26380) [rescue] 192.168.56.103: Redis Master (:6379), Redis ...
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43 views

Adding hosts to existing 2012r2 Hyper-V cluster

Situation: Two separate clusters, server 2012 and server 2012r2 In process of disassembling the 2012 cluster and upgrading those hosts to 2012r2 Prior to this I must move all of the guests to the ...
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Does Stop-CauRun Stop the Current Server or the Whole CAU action?

When using a PreUpdateScript or PostUpdateScript with "Windows Cluster Aware Updating" and "Updating Run Profiles" would calling the cmdlet Stop-CauRun do any of the following: Would it actually ...
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1answer
83 views

“Applications and Services” is missing from Failover Cluster Manager

Microsoft instructions advise to use "Services and Applications" but it's missing from the Failover Cluster Manager. For example, the documentation for Test the Failover of a Clustered Service or ...
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240 views

Windows Failover Cluster - Create Cluster Wizard: error occurred while creating the cluster

I have 2 identical Windows Server 2008 R2 servers which I am trying to setup a failover cluster on. The "Validate a Configuration" passes, but the actual creation process produces an error: An error ...
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47 views

“A virtual machine fails to power on with the error: Thin/TBZ disks cannot be opened in multiwriter mode” - after disk size change in client

I tried to increase the size of my clustered virtual disk (2 vms) though the vSphere client. Big mistake apparently. Now when I attempt to start the vms, I get "A virtual machine fails to power on ...
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1answer
189 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: ...
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1answer
118 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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93 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
77 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 ...
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4answers
262 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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44 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
115 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
60 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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1answer
355 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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27 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
65 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
59 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
24 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 ...
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88 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
101 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 ...