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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Adding a new node to a Cassandra deployment

I have a basic Cassandra deployment that contains a single node. I want to add a second node to the deployment, and I want clients to have access to the same data regardless of which node they happen ...
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56 views

How to submit ABAQUS job on Rocks cluster?

I created ROCKS6 cluster and i installed ABAQUS on my cluster and it works well on frontend, but i can not submit job on my 2 other compute nodes. I just want to run ABAQUS on this cluster (frontend ...
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148 views

Cassandra nodetool repair failure - broken pipe

we're trying to check our Cassandra cluster data integrity with: nodetool repair but after several minutes (~2-10min), we got strange connection resets / broken pipe stack trace on a first node: ...
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59 views

IIS can't recover connectivity to shared configuration: “Configuration file is not well-formed XML”

I am creating a HA cluster of web servers. For this particular install its not practical to set up all the infrastructure required for Web Deploy to be fully automated. Instead, I'm using Shared ...
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48 views

Cassandra: having trouble setting up cluster from existing node

I have on existing node, nodeA, at 10.43.0.15. I have that ip address set as its listen_address, broadcast_address, and broadcast_rpc_address. NodeA has data on it already, and I'd like to add another ...
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77 views

MariaDB galera cluster fail when dumping or optimizing database

It seems that a Galera cluster deadlocks every time when I run a mysqldump or table optimize. I've ran a "mysqlcheck" and a "mysqldump" on my MariaDB 10.1 database server several times. (which runs ...
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46 views

etcd cluster setup with chef - determining initial-cluster-state

I am writing chef scripts to setup an etcd cluster. The list of nodes (including their IPs) will be hardcoded in the chef script (as an attribute) and it will pass them to etcd using static ...
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46 views

Unable to connect to MASTER: Resource temporarily unavailable : Connecting to MASTER no:0

I'm currently working on simle active stand/by Redis clustering for query caching with Keepalived. The problem I'm facing is when I shutdown&start(restart) the host1 server for testing, it ...
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1answer
55 views

Single host CSV

I have a single physical server with directly attached SAS storage that I run Hyper-V on and within it all of the machines on my lab (AD, Exchange, SQL, SCCM, SCOM, File Servers, etc). I am trying to ...
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51 views

Keepalived notify script isn't executed

I just set up the notification script in /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf global_defs { notification_email { admin@example.com } notification_email_from ...
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2answers
62 views

Confused about windows failover cluster, DC and SQL AlwaysOn

I'm setting up a AlwaysOn group for a SQL Server 2014 database. However, as this is my first time I have a lot of questions and as I proceed to solve one issue, another arises and this seems to go ...
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32 views

DNS sometimes returns internal IP outside

I have 2012r2 cluster, with active directory, DNS and DC. This cluster has internal private network (IP 10.1.x.x). That cluster DNS has parent external corporative DNS. Every node has also external ...
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54 views

File transfer (copy) queue for a Linux cluster

I am running (on CentOS 6) a cluster connected to the head node over a slow network. Each spawned job needs to pull a ~1GB file from the head node to the compute node, and then process it locally. The ...
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1answer
438 views

Can not start PostgreSQL replication resource with Corosync/Pacemaker

I'm setting up a PostgreSQL replication on two servers (CentOS 6.5) with HA by Corosync/Pacemaker. My software info: postgresql91-9.1.19-1PGDG.rhel6.x86_64 ...
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14 views

Faulty connection JBoss servers in the cluster

I'm trying to connect two servers (jboss 6 eap in a cluster). In the domain controller, I see two servers, then deplying test application. Unfortunately, the test was negative, the session is ...
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29 views

Can one machine be the part of two Microsoft failover clusters?

Can one machine be the part(the node) of two Microsoft failover clusters or not?
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2answers
146 views

Is Server Clustering Right for a 25 Person Business?

Company owner wants high availability as even a 1 hour downtime kills billable revenue for 20 accountants. I've got a one year old Dell PE T110-II running 2012 Standard and an ancient PE 840 running ...
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86 views

glusterfs backup - how to migrate image to new server?

I am running glusterfs on a 3 node prod server with thinly provisioned LVM-Volumes. My goal is to automate a backup process that is based on gluster snapshots. The idea is basically to run a shell ...
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1answer
99 views

Vm goes to saved state when removing CSV

I have a 5 node Hyper-V cluster running. All 5 servers are running Server 2012 R2, each node is attached two devices using iSCSI. The device I'm having problems with had a single volume that was used ...
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73 views

IP configuration of cluster application to database server

I need to setup the IP of a cluster of applications servers to connect to a cluster of database servers. For 1 to 1, application server to database server is quite easy, but when comes to a cluster ...
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66 views

pacemaker supervisord and resource groups

For environment and config pls check HA pacemaker monitor_5000 on zabserver-a 'not running' (7): call=53, status=complete, last-rc-change='Mon Jul 13 07:51:32 2015', queued=0ms, ...
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0answers
18 views

Transparently farm processes out to cluster

Situation: At work, we have an in-house tool for data crunching. When a job is triggered, it starts multiple copies of itself in separate processes and communicates with them in order to crunch in ...
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2answers
111 views

Nginx alternative listens

I have some Nginx servers which shares their configuration together because they are in a load balancer pool. So I have a unique configuration for all servers and all servers are listening on *:80 ...
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1answer
59 views

Best practice for managing a whitelist of ips across multiple servers with iptables?

I was wondering what the best practice for managing a whitelist of ip address across multiple servers? We want to allow our user base to add an ip address they want to whitelist through a web ...
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1answer
124 views

Do you Suspend-ClusterNode before or after Move-ClusterGroup?

Which do you do first to avoid service interruption? Or does it not matter? Is it: Suspend-ClusterNode -Drain Get-ClusterNode $env:COMPUTERNAME | Get-ClusterGroup | Move-ClusterGroup or: ...
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101 views

Can I use my 2 domain controllers also as my 2 node file server cluster?

I already have 2 domain controllers running Windows Server 2012 R2. This network doesn't have any file servers or SANs. It hardly needs any. But, I have one small need for a shared file folder and ...
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49 views

Looking for Failover Cluster for Scientific Linux and nginx [closed]

here is what I'm trying: two instances of SL7.1 with nginx as reverseproxy no shared filesystem shared resources: virtual IP running nginx service I already tried keepalived and corosync + ...
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8 views

Is it possible for an user to run a cluster job (PBS cluster, for instance) that keeps alive a connection to an external mysql server?

In the case it is not, which is correct way to address such dependency on a DBMS as a cluster admin? Is it necessary to resort to an internal database server somehow suitable to redirect the ...
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260 views

Unable to create cluster in Windows Server 2012 R2

I am trying to create a cluster in between two networks/gateway and validation is perfectly passing and after that i am getting error as An error occurred while creating the cluster and the nodes ...
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1answer
369 views

What is the minimum amount of servers for a production mongoDB cluster?

On the mongoDB documentation for a production cluster architecture I read that the minimum amount of servers for a running production mongoDB cluster is 7: Is it possible to share the routers, ...
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1answer
69 views

Set up SGE to Fill Each Node Completely Rather than Distribute Jobs

Originally posted on Stack Overflow by mistake... See PS at bottom for response from that post. I've search for this a while, but cannot find the answer. The problem I have is this: assume I have a ...
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36 views

Cluster pacemaker active/active low performance

I have a problem in my cluster active active configuration: pacemaker 1.1.12 corosync 1.4.7 cman 3.0.12 resource-agent 3.9.5 Varnish 4.0 Config: Cluster name: Clu1 Last updated: Tue Sep 8 ...
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257 views

Using heartbeat with systemd

I'm using a simple setup with heartbeat handling a shared filesystem implemented with drbd and served via apache. I'm using /etc/ha.d/haresources to define the ha resource, this way: server1 ...
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111 views

Windows Cluster 2012 admin shares

With CRM, when you try to create an organisation the deployment manager will try to create a file on the SQL server via the ADMIN SHARES. It does this as it will then use this file as the base ...
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126 views

Apache mod_wl2.4 plugin error parseJVMID

I have some issues with setting an clustered environment for weblogic and Apache. The structure is like this: 1 webserver that proxies requests to a clustered environment of 3 weblogic servers. ...
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1answer
35 views

CentOS and Clustering

I'am searching a way to create a cluster of servers based on some rules making it cheking if http, https and custom ports are locally serving request and the same for other remote machines, and if ...
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2answers
102 views

What are the directories and files that I should keep in sync for a cluster server

I am currently wanting to set up new clusters. Each cluster is defined by its software installed, software settings, and its home folder files. I want only the above to be cloned and not things ...
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1answer
12 views

How to retain the Session vars when deploying in Clouds and Cluster servers?

How do you ensure your user retains the same session information when your application is deployed to a cluster?
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265 views

Windows 2012 R2 Cluster

This is my first time building a Failover Cluster. I run the validation and every time I get the following. "Failed to prepare storage for testing on node {SERVER NAME}: The remote procedure call ...
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50 views

Could HAProxy disable the Apache Instance on the same node it is running?

I have a setup with three VMs that are running on a core i74xx. The machines form a LAMP cluster with HAProxy doing the loadbalancing. After running multiple load tests I found out, that throughput ...
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1answer
29 views

How to sync clock and UIDs across different nodes of a cluster with Ubuntu?

I am new to cluster computing and Ubuntu. We have a computing cluster with 4 nodes (10 cores per node) with Ubuntu installed. The cluster is meant for scientific computing. To install a load ...
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1answer
26 views

Pool of machines without authentication?

I am working on a cluster of linux machines. What I need is for authentication to not be needed between the machines in this cluster, but required from outside. I have considered the idea of setting ...
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134 views

RedHat Cluster 6 node won't see shared volume group

I try to create a shared clvm volume group shared between 2 nodes of a Red Hat Cluster 6. Here is the procedure I followed: [root@node1 ~]# pvcreate /dev/mapper/mpathab [root@node1 ~]# vgcreate -c y ...
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88 views

Simultaneous server crash in fail over cluster

I have 2 servers in a failover cluster. The cluster defines a shared 'ClusterStorage' drive. The drive maps to a SAN device through iScsi. Recently, the 2 servers rebooted on their own at the same ...
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367 views

how to do automatic failover of mysql / galera cluster

I have two mysql/galera clusters of three nodes each (two + garb node). The clusters are in separate DC's (dc1 and dc2) The cross cluster replication happens between node1-dc1 and node1-dc2 I want ...
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116 views

Ceph remain in HEALTH_WARN after osd remove

I have a cluster of 3 servers with cepth storage over 9 disks (3 each server). One osd is going down/out and so I "remove" it, after that system start to rebalance data over the remainig osd but after ...
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3answers
567 views

Can we build a Hyper V failover cluster without a SAN or other shared storage?

I have a question about Hyper-V Failover Cluster. I have 2 server Hyper-V and want to use a failover cluster. As far as I know, I need a SAN server for that, so do we need it in here?
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1answer
33 views

Keepalived in the AWS autoscalling group

I want to deploy Keepalived in the AWS autoscalling group. The issue that Keepalived need to know ip address of the each node in the cluster, that is difficult in the elastic environment, where we ...
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2answers
412 views

pcs status error httpd_monitor_5000 on server 'not running' (7):

Error Message Failed actions: httpd_monitor_5000 on abc-zabserver-b 'not running' (7): call=65, status=complete, last-rc-change='Wed Jul 15 21:44:43 2015', queued=0ms, exec=8ms pcs status ...
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87 views

Windows Cluster An error was encountered while determining shared storage

Our SAN manager has added a new disk for our cluster. this is a new 6TB disk that will be used for backup and will be part of a file share. I have put the disk online, initialized it and assigned the ...