Questions tagged [cluster]
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.
1,369
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puppetrun not reporting client errors
puppetrun doesn't report errors my puppetclients encounter. for instance, if I put jibberish into site.pp and run puppetd --test on the clients I get an error. if I run puppetrun on the puppetmaster ...
razor
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1
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Hashicorp's Nomad as a HTCondor alternative?
I couldn't find any info on this short of spinning up a Nomad cluster and experimenting so maybe someone here may be able to help.
Saying you want to run 100 iterations of a batch java job, each with ...
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I/O high on DRBD disk drbd10 on stacked site
We have 4 Redhat Boxes Dell PowerEdge R630 (say a,b,c,d) having the following OS/packages.
RedHat EL 6.5 MySql Enterprise 5.6 DRBD 8.4 Corosync 1.4.7
We have setup 4-way stacked drbd resources as ...
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SAS balancing vs Network balancing
I want to configure file server in MS Windows Server 2012 R2 environment, which would load balance traffic.
I have got a SAS disk array with 2 SAS controllers which is connected to 2 Hyper-V cluster ...
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How to set up alerts on Ganglia?
How can I set up Ganglia so that I get an email if a machine in the cluster is using, for example, greater than 95% of physical RAM?
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Recommendations for distributed processing/distributed storage systems
At my organization we have a processing and storage system spread across two dozen linux machines that handles over a petabyte of data. The system right now is very ad-hoc; processing automation and ...
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Red Hat/CentOS cluster compared to HeartBeat?
What are the main differences (other then UI) between RH/CentOS cluster and heartbeat?
I have some experience using heartbeat, but wondered what the RH/CentOS provides, and looking at docs it seems ...
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Migrating Windows 2003 File Server Cluster to Windows 2008 R2 Standalone?
We have a situation where we have an aging Windows 2003 File Server Cluster that we'd like to move to a standalone Windows Server 2008 R2 VM that resides in our Hyper-V R2 installation. We see no ...
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Is this a HPC or HA mySQL cluster?
Can someone tell me if this is a High Performance Compute or High Available mySQL cluster?
There is a picture of the setup.
This is part of the config.ini they talk about
[ndbd default]
...
- 486
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Distributed File Systems
So, I've been reading several articles around ServerFault as well as google. (For Example, this link)
My Requirements are very similar to the link above, however i'd like to also have dynamic or at ...
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Pitfalls to using Gluster as a home/profile directory server?
I was asking recently about options for divvying up access to file servers, as we have a NAS solution that gets fairly bogged down when our users (with giant profiles, especially) all log in nearly ...
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Cannot add second host to a Network Load Balance cluster
I am using Network Load Balancing on Windows server 2008. (Servers have two NIC's and the cluster is configured to run in unicast mode)
I can configure the cluster on either of the hosts and add the ...
- 193
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771
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Puppet master and resources graph
I've setup rrd reporting + graph on my puppet master, my nodes report as expected and I can see the 'changes' and 'time' graphs, but I miss the 'resources' (html and daily weekly monthly yearly graphs)...
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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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Nginx - multiple servers configuration
I have a cluster of 8 independent web servers, each of them running nginx.
They are all hosting the same websites and are being synced with rsync.
Also, each server has 8 different IP addresses ...
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How does a SQL Server Availability Group decide on which secondary will become the new primary when an automatic failover is triggered?
How does a SQL Server Availability Group with multiple synchronous-commit secondary replicas decide on which secondary replica will become the new primary when an automatic failover is triggered? Can'...
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Pacemaker corosync 2-node with a 3rd for quorum
I'm having trouble figuring out how to configure a 2-node setup with a third
simpler one for quorum.
It seems to think all the nodes have the capability to act as a full fallback node, when I only I ...
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Prevent iSCSI connection from being terminated early on reboot
I have a clustered Hyper-V environment with four nodes and three PowerVault MD3xxx storage arrays for shared storage.
The servers are using standard Ethernet connections for the iSCSI fabric (not ...
- 7,188
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Tomcat mod_jk cluster skip 404 http status
I am trying Tomcat Clustering with mod_jk for months and so far not so bad but facing a problem during deployment. I am using FarmDeployer to copy and deploy the WAR to other nodes in the cluster but ...
- 1,753
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Mysql ndb cluster - node restart
I just setup a mysql cluster on a fairly decent baby (IBM x3650 M3) with 24GB memory, xeon 6core, SAS 6Gbps HDD. Running Debian Lenny 5. 64bits.
Ndb version is 7.1.9a. Our database size on MyISAM is ...
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Windows Server 2008 Cluster Errors
We have a couple dozen Win2008 and 2008R2 Enterprise clusters that are used for SQL Server 2008 and 2008 R2 Enterprise/Datacenter. In the past we have had many issues with random failovers and "...
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What are good options to cluster file servers?
We have a NAS with relatively slow disks that is choking when users are logging in in the morning. We're migrating user home directories and profiles to a newer, faster server, but I was wondering if ...
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Experience with CVS on a clustered filesystem
I would be interested in any experiences using CVS on a clustered file system with mulitple servers accessing it. I guess this is similar to what providers like SourceForge do.
Currently we use a ...
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Copy nginx cache between two servers
I have a nginx caching server with at least 2tb of cache files at any moment, i need to migrate this server to another hosting provider but none of my clients can handle that traffic without cache.
...
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Pacemaker ocf:heartbeat:IPaddr on different subnets
I'm trying to add a Pacemaker virtual IP address; with it, the gateway, and the two VMs it serves on different subnets. I've only done this before with all IPs on the same subnet, and I need some help....
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clvmd problems during the RHEV cluster deployment
We are deploying Red Hat Enterprise Virtualization cluster and we faced a problem attempting to start clvmd service after the lvm partition creating. The following has been completed successfully:
...
- 159
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Windows Server 2012 - Hyper-V - iSCSI SAN - All Hyper-V Guests stops responding and extensive disk read/write
We have a problem with one of our deployments of Windows Server 2012 Hyper-V with a 2 node cluster connected to a iSCSI SAN.
Our Problem
Our problem is that for some reason all of the VMs stops ...
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Looking for advice on Hyper-v storage replication [closed]
I am designing a 2-host Hyper-V R2 cluster with 6-10 guests stored on a SMB iSCSI SAN device (probably Promise VessRAID). I will be getting at least two of the SAN devices and
need to eliminate the ...
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MySQL Clustering and replication
I want to setup a MySQL cluster setup of two servers (M1-M2). I also want to setup MySQL replication between two servers (M1-M3).
Is it possible to setup both clustering and replication as above. Is ...
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Most resilient form of (private) DNS clustering?
I'm working on a setup with two datacenters linked by a MAN (bridged) and everything is doubled between them, in fail-over mode with RedHat Cluster, DRBD and that kinf of things.
I have one DNS ...
- 2,073
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linux clustered Filesystem
I currently have two CentOS Boxes providing NFS Services to multiple Web servers.
Could someone recommand a file system which would mirror all files across both of these servers easily and ...
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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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Replacing failed hardware in a hyper-converged cluster node [closed]
Is it possible to replace failed physical components (such as disk, RAM, or power supply) in a hyper-converged node (such as VXrail or Nutanix) without taking the node offline?
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Must all nodes of an Elasticsearch cluster be identical?
In an Elasticsearch cluster, must all nodes be identical i.e. having the same:
Operating System
Amount of RAM
CPU speed and number of cores
etc.
or is it allowed for the nodes to be different? (...
- 1,105
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HA mail server configuration
I have a mail domain and two servers (machines) with Centos 6.4 and public IP addresses. Postfix mail server and Dovecot IMAP/POP3 Server are installed on both.
How would I set them up redundantly so ...
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Sharing SSL Certificates in a Cluster
Hopefully a very simple question, if I wanted several servers providing the same service to hold a certificate (e.g interface.internal.org) would the procedure be;
Generate Public/Private Pair on one
...
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How can I fix a bad arp entry?
I'm just guessing that arp is my problem...
I have a linux drbd server cluster set up, and due to some power issues had to unplug the switch that connects the two servers. As a result, both servers ...
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nginx + PHP-FPM farm?
I have a setup with two small servers running nginx serving as proxy and a number of Apache+mod_php beefy servers. I am thinking on going over to PHP-FPM. Can I configure nginx to use a number of ...
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What's the difference between Clustering and Load Balancing?
In Server 2008 R2 you can create a cluster of computers, which as I understand provides fail-over if a server dies. With Network load balancing I beleive this "offloads" some of the load to other ...
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In a container cluster like Kubernetes or Docker 1.12 Swarm, how do you resolve with external DNS to the good container on the good host?
Maybe I am dumb, maybe am I just not using the good words, but I can't find even one answer anywhere on Stackexchange or the whole Web.
I have created lots of website, mostly with Wordpress, Drupal, ....
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Hyper-v failover or replication in 2 node cluster
I'm trying to setup some form of a failover cluster between 2 hosts. I want to be able to have high availability on 2 of my VMs.
It seems that some form of shared storage is required for this to work ...
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Farm Deployer not working in Tomcat Cluster
I have setup apache-tomcat clustering(Ubuntu Server) and I used tomcat supported clustering technique with mod_jk following the link. I've setup with One Load Balancer and Two web servers.
The major ...
- 1,753
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How use DNS server to create simple HA (High availability) of my website?
Welcome,
How can i use DNS server to create simple HA (High availability) of website ?
For example if my web-server ( for better understanding i use internal IP in real it will be other hosting ...
marc22
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5
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Disable fencing in RedHat Cluster?
Whilst I'm developing with RedHat Cluster, I'd like to be able to disable fencing completely. The documentation for this stuff is fairly lacking - can I do this at all, or should I be looking to fake ...
- 802
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Clustering Microsoft versus Linux
Does anybody have experience with both Linux and Windows failover redundancy clusters, and if so which do you prefer for file server and/or web server?
For a little background. We set up and ...
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How to implement clustering for Windows XP SP3 PCs
In a nutshell, how should this be implemented? Basically, I want to cluster a file and web server running apache2.
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Pacemaker and DRBD on Hyper-V
I need to setup two-node Web cluster for Apache web site. I have Hyper-V infrastructure and only two nodes.
The points are load-balancing and high availability.
I installed and configured two VMs ...
- 163
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answer
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Active directory (AD) best-practice for clustering
We want to use AD as a regular LDAP for storing and accessing our application data in fast and reliable way. We have two physical server and want to organize some sort of clustering for AD and its ...
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Display or install Windows product key on command line
We are currently in the process of setting up several Windows HPC clusters using Windows 2008 HPC R2. We would like to be able to perform Windows licensing commands across the clusters via the ...
- 1,301
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MSSQL Two Database Servers 1 Database
We have two servers. They are both HP DL 380 G6 servers with the same hardware and specs running Windows Server 2008. Currently the second server is a warm standby for the first with an automatic fail ...
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