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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Difference between all servers in one cluster and more than one cluster with servers? [closed]

Not sure I understand what´s the difference or how it works when servers a running in one cluster or if there are more than one clusters with servers in it - regard High availability & Load ...
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1answer
61 views

SNMP walk on Virtual Ip not working? what can be the reason

I have two MSSQLcluster, at a time VIP [virtual ip] that will be assigned to on of the master. The problem is when i try to do any snmpwalk on VIP from a different machine its returning me a time out. ...
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50 views

Number of public ips for wackamole

I am trying to configure a highly available cluster consisting of three boxes with public ips. How many public IP addresses will I require for this? Can I configure spread on a private NIC and manage ...
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2answers
41 views

How to broadcast a command on Windows

I am going to frequently deploy different versions of a program on a cluster of Windows machines (mostly Windows XP), so I am willing to use a command-line broadcasting tool (either built-in or ...
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1answer
92 views

Galera Cluster starting backup can't find innobackupex in the path

I am trying to get a Galera cluster running. I have the first node up and ready for connections. My second node, however, when trying to run wsrep_sst_xtrabackup gets the error "Can't find ...
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84 views

How should I setup outgoing smtp for app emails on load balanced Windows servers

I've recently setup a small group of servers to host a couple dozen asp.net applications that send out emails for things like customer registrations, purchase receipts, error alerts, nightly batch ...
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63 views

Balanced WCF- Local MSMQ or MSMQ Cluster

Hello I need a professional advice on MSMQ. The setup is the following: SOAP Client -> SOAP Message -> NLB WCF Web Service Node -> The node sends the message to a local MSMQ transactional queue. ...
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1answer
109 views

pbs check how much cpu a job is using / job % cpu usage

On a cluster a job is submitted to run on N CPUs. qstat -f doesn't show how much CPU resources the job is using other than the time. How does one check whether 100% of each CPU power is used? It is ...
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1answer
85 views

Is there any way to achieve a network fault-tolerant print server?

Our infrastructure is actually composed by a main datacenter in headquarters, where are centralized almost all of the services and aplications, and a smaller datacenter, in a building accross the ...
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28 views

Matlab & clusters & batch

My school will get one small cluster for Matlab. The cluster will run Linux and "MDCS" - MATLAB Distributed Computing Server (http://www.mathworks.com/products/distriben/). I'm "trying" to understand ...
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2answers
292 views

Graphite/Carbon cluster returning incomplete data

Trying to setup a Graphite/Carbon cluster. I have an elastic load balancer that directs traffic between two nodes in my cluster, each with one web app, relay, and cache. In this example, I sent 1000 ...
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212 views

No disks were found on which to perform cluster validation tests

I am trying to make a cluster of two Hyper-V machines running Windows Server 2012. There is a SAN available in which I have created several partitions to use such as J drive, K drive L drive etc. ...
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121 views

IOException: Operation not permitted; No faulty members identified

I am running a tomcat cluster with three tomcat instances and one Apache server. I have all MAC server except one RHEL box, on RHEL server my tomcat-cluster is not starting properly which is causing ...
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1answer
202 views

Apache with mod_jk with glassfish instances, large number of established connections for low number of users [duplicate]

I making a tuning for our production servers for a portal, we have 4 servers, 2 for web and 2 for app, and there is a firewall before and after web servers (so yes there is a firewall between app and ...
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0answers
39 views

Windows program started with conhost.exe has no access rights to network shared drives

We clustered a Liferay portal that runs on Glassfish application server (java). The newest Glassfish works in the way that it has a central node that can start other nodes on other computers with ...
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58 views

PostgreSQL replication lag Ubuntu 11.10/12.04

I've a PostgreSQL cluster running on Amazon AWS EC2 instances with streaming replication and "hot standby" option enabled. I'm now gradually upgrading it from Ubuntu 11.10 to Ubuntu 12.04 LTS and I've ...
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1answer
413 views

MariaDB Galera Clustering - Active Active - Operation not permitted error

I am having issues with MariaDB and Galera running on RHEL 6.4 & 6.2 64bit servers and getting them to cluster. I installed the required RPM's for Galera clustering: MariaDB-Galera-server ...
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42 views

Firewall rules between windows cluster

I have been given the task to define firewall rules between 2 Windows clusters. The first cluster hosts a clustered middleware application and the second cluster hosts SQL Server. The 2 clusters are ...
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1answer
88 views

HAProxy SSL connection error

Brand new to setting up SSL with HAProxy and Litespeed load balancer, just generated my certificate using the .csr and am trying to have HAProxy terminate SSL before sending it to the web worker ...
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1answer
27 views

Running jobs in a HPC cluster [closed]

I'm quite new to HPC environment. Is there any difference in running a job on a node utilizing 8 cores and running the same job on 8 nodes utilizing I core in terms of performance or walltime used. ...
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1answer
71 views

Liferay cluster with SAN storage with ext3 [duplicate]

I'm deploying an liferay portal in a cluster which has 2 node load balanced, and config both to access to the same data location in a SAN storage devide. The problem is each node can not see the other ...
1
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1answer
33 views

How to create a slurm queue for the headnode

Is there a way to create a SLURM queue that runs on the headnode? I'd like to be able to do this as a first level testing queue sort of, before trying to run on multiple nodes. I've tried stuff ...
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2answers
137 views

MySQL geographic replication cloud

I currently have a standard local LAMP setup, (2 web servers, master/slave MySQL, load balancer). This is severing me well locally, but my global users experience slowness. I want to setup some ...
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2answers
85 views

Oracle Weblogic 10.3.5 Cluster creation issues

I'm trying to create a two node cluster with Oracle Weblogic 10.3.5. During the "Fusion Middleware Configuration Wizard" setup process, I'm not sure what to put in for the "Cluster Address" if I ...
2
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2answers
410 views

Why has Red Hat Cluster Suite stopped working?

I've been testing the Cluster Suite on CentOS 6.4, and had it working fine, but I noticed today [8th August, when this question was originally asked] that it's not liking the config that was ...
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1answer
150 views

MariaDB Galera Cluster hang after issue cluster command

When trying to cluster two MariaDB Galera servers on RHEL 6 together using the command: mysqld -uroot --wsrep_cluster_address=gcomm:// and the screen then sits there, and looks at me with this ...
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1answer
144 views

When trying to delete a table from NDB Cluster, I get the error “4243: Index not found”

In a Linux-based NDB-cluster consisting of 7 API nodes, 1 Management node and 4 NDB nodes, I am trying to drop a table. When I try to drop the table using MySQL Client, I receive the following ...
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1answer
216 views

Is there a programmatic way to determine free disk space on a Linux server?

I have a collection of Linux servers, each of which has a local hard drive with a /tmp directory. Occasionally, the /tmp directory on a server will fill up and cause errors. I want to automate the ...
1
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1answer
101 views

Is it possible to speed up network filesystem by sth like unionfs, aufs?

I need to speed up slow, large storage with local SSD drive. I figured out I could do this with union filesystems. Here are results with nginx reading data from: local SSD alone: ~140 ...
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116 views

How to configure cluster.conf for failover routing two networks?

I'm routing between an "external" subnet with Internet connectivity and two "internal" subnets, using iptables forwarding on a Linux box running CentOS 6.4: I'd like to now duplicate this router ...
3
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2answers
3k views

2012 Cluster service name failing

I have successfully created a cluster, but any services I try to cluster fail with the same or similar symptoms (I have tried clustering DTC and installing a SQL cluster). Environment: 2 – nodes – ...
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1answer
244 views

When creating a Win2012 cluster “The network name is already used on the network” no matter what name is used

I have a test setup that has 2 Windows Server 2012 VMs on Hyper-V joined to a windows 2008 R2 domain - there is an internal network whose DNS server is on the domain controller and an external network ...
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81 views

Timeout on heartbeat STONITH (IPMI fencing)

I am managing a two node heartbeat DRBD+MySQL+FreeRADIUS cluster. I am currently using external/ipmi fencing as my STONITH solution. However, I am running into a problem where the primary node has a ...
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1answer
180 views

Heartbeat meatware STONITH on kernel panic

I have a two node cluster with heartbeat and DRBD managing a mysql resource. The failover works great if I halt the primary, reboot it, or disconnect the network connection. However, if the primary ...
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26 views

drbd ocfs2 how many filesystems per node

I have 4 drbd devices, can i have an ocfs2 file system for each drbd device? research indicates that it is possible to have a node connected to multiple clusters, i am not sure if it is the same ...
0
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1answer
135 views

RedHat 6 Cluster Failover

I'm testing the RedHat Cluster Administration tool documented here: https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Cluster_Administration/index.html I have two ...
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1answer
53 views

Detect if the original node failed in tomcat cluster

I have two nodes in a cluster. Node1 initially servers requests. Loadbalancer redirects the request to node 2 if the first node fails. I would like to know if there is a way for the Node 2 to detect ...
0
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1answer
54 views

Intelligent, Location Dependent DNS

I'm new to complex network infrastructure but I'm quickly realizing that we're outgrowing our centralized load balanced cluster. The way we have things setup right now means that in order to add a ...
0
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1answer
152 views

Session replication in Tomcat

I have setup my cluster with one loadbalancer and 2 nodes with sticky session. I am using mod_jk for loadbalancing. I am having problem with proper session replication. I am using Tomcat 6. When I ...
0
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1answer
38 views

Authenticate ftp users on mysql through secure channel

I've to face this problem regarding security: some sFTP servers (proftpd) in a dmz that need to authenticate users against a mysql (native cluster|percona cluster|MariaDB cluster) through a secure ...
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2answers
133 views

What “pieces” are needed in order to set up a cluster of physical servers?

Background: Currently, we use Rackspace cloud servers. We have no intention to stop using them, but would like to look into setting up a cluster of physical servers (probably desktop computers in the ...
1
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1answer
615 views

WARNING: Context manager doesn't exist

I have cluster setup with session replication. I have one load balancer with 2 tomcat instances as the worker nodes. In one of the node I am getting the WARNING. NOt sure what it really means. Session ...
0
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1answer
101 views

Hyper-V - USB Disk mapped to VM

If I have a VM on a Hyper-V host with an IP 192.168.50.25 (VM IP), where the Host has an IP of 192.168.40.25. (The host itself has a virtual switch whose NIC patches into a procurve onto the VLAN ...
1
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1answer
36 views

Coherent logs from multiple identical nodes

I have multiple web heads running a stack containing Apache/mod_php/Magento/MySQL and more. Every time I need to view logs I find myself jumping on multiple servers to view logs in different files ...
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3answers
713 views

mod_jk produces Error smh errno=13

I am trying to use mod_jk for load balancing. Loadbalancer 172.17.8.189 (HTTPD+mod_jk) Node1 172.17.8.193 (apache tomcat instance 1) Node2 172.17.8.196 (apache tomcat instance 2) I checked my tomcat ...
0
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1answer
132 views

Failover Cluster Migration Wizard (SQL Install Portion)

Have 5 SQL 2005 to 2008 R2 clustered instances. I've setup a new cluster to prepare to use the cluster migration wizard. As I understand it you have to install SQL before running the cluster migration ...
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176 views

Server 2012 cluster - SAN volume - failover not working

The following configuration is available: - 3 HP SAN disk Enclusores / 2 SAN controller; HSV200 (FC) - 2 HP Brocade SAN switches - 2 HP blade servers, each with a QLogic FC HBA QMH2462 - SAN volume is ...
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2answers
185 views

A roundrobin for incoming files

A bunch of new files with unique filenames regularly "appears"1 on one server. (Like hundreds GBs of new data daily, solution should be scalable to terabytes. Each file is several megabytes large, up ...
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2answers
37 views

2008 Clustered Services (SQL) to 2008 R2 Clustered Services

I've found plenty of articles for upgrading SQL in a clustered environment from SQL 2008 to SQL 2008 R2. However, I have not found much information in relation to migrating a current Server 2008 ...
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1answer
67 views

LDAP URL example: is it possible / correct to use only the domain without the hostname?

We have an application which connects to an Active Directory (MS) using LDAP protocol. We give usually the following parameters: ldapUrl = ldap://myserver.mydomain.ext:389 ldapBaseDn = ...