discusion related to cluster mecanism.

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HAProxy with Roundrobin working only on 2 of 3 MySQL servers, why?

Good day. I'm following this article to configure HAProxy to balance with roundrobin between 3 MySQL servers (db1, db2, db3) in a MariaDB Galera cluster (working perfectly). However I have a ...
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17 views

How to benchmark performance and ensure high-availability in a CentOS 7 cluster?

To give you a little context on my question, I'd like to mention that I am writing an essay on high performance and high availability clusters using a 2-node (I know that is not optimal, but it's what ...
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2answers
32 views

Code for submitting job on cluster

I don't know whether this is the right place for posting this question, if not kindly let me know where I can ask. My doubt: I use the following code to submit a job on a cluster, but I don't know ...
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1answer
30 views

Clustered NFS server reply ERR 24: Auth Bogus Credentials (seal broken)

I have 4 servers on the VirtualBox. Two of the servers are a CentOS 7 cluster with Pacemaker(corosync), and they have an NFSv4 server in Active/Passive mode. There are also 2 clients with CentOS 6, ...
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1answer
36 views

Saving power on a linux cluster

I would like to buy a cluster (30-60 nodes) for work and install linux on it. The cluster should have a queue system like PBS, for instance. It should also be capable of doing parallel computation. I ...
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60 views

Error starting MySQL in a MariaDB Galera cluster in CentOS 7

I'm trying to setup a MariaDB Galera cluster following this tutorial exactly as it is, and I'm stuck in the Step 7– Initialize the first cluster node, I'm doing so with sudo /etc/init.d/mysql start ...
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1answer
33 views

Why did Red Hat drop support for DRBD beginning with RHEL 7?

Does anybody know the reasons why Red Hat decided to drop support for DRBD beginning with RHEL 7, thus favoring GlusterFS as the preferred solution for network-based replication / mirroring in a ...
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38 views

clvm (cman) has problems with dlm

I am trying to create a volume group which is accessible on two servers with clvm. I read about it and it looks like it is most easily to do this with cman. But after hours of testing I cannot achieve ...
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2answers
28 views

mknfsmnt fails with “System call error number -1”

This system is part of a cluster and the other node mounts the nfs share successfully. This is currently the active node which means it has a secondary service ip address. I think this is related to ...
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26 views

quorum disk and heuristic checking in CentOS7 Cluster

In CentOS6,we use to configure qdisk for two nodes cluster to quorate. How about in CentOS 7? I can't find any clue to do the same for it. Help will be much appreciated. Thanks,
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88 views

Two Nodes CentOS 7 Cluster clvmd

I am trying to set up two nodes CentOS 7 cluster with clvmd. I added dlmd and clvmd as clone resources in cluster using pcs command. When both nodes are up, dlmd and clvmd can start properly. But ...
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23 views

Hadoop cluster and wifi

I have a three node hadoop cluster with out internet. I have WiFi. Can I connect to wifi and hadoop cluster simultaneously?
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1answer
33 views

Linux run every program on cluster

I am playing around with Open MPI and I must say I love the concept of running programs on the cluster. The problem I am facing with Open MPI is that a specific program must support this way of ...
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37 views

Problems with kerrighed

I heard about kerrighed and i want to use it for rendering with blender because it is a single system image. I tried to install it over pxe like the installation guide from kerrighed.org says. The ...
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1answer
27 views

reduce bandwidth consumption from downloading yum updates

I have several machines (7) running fedora and would like to reduce the amount of external bandwidth I am consuming. I see that there were several attempts to setup mirrors, but those projects seem ...
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1answer
66 views

Linux Cluster - SFTP between failed over Servers

I have a strange problem with our cluster solution on Linux. We have the following set-up in our environment. Each of these servers hosts our enterprise application. Server1 Server2 Server3 ...
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1answer
72 views

mysql high availablity for LAMP application (ubuntu 14.04)

im trying to achieve HIGH Availability (HA) for a LAMP application(News Portal website) which might be of interest to many unfamiliar users.For files im using Glusterfs (replica) for redundancy ...
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48 views

XFS over iSCSI share with Cluster? Will fencing cause data corruption/loss?

I have a Question: when using XFS on iSCSI share, where HA is enabled, nodes may be fenced by cluster. Will this result in Data Loss/Corruption etc ?
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13 views

PBS limiting the number of process on a node

I am trying to run a program on cluster. The program can distribute each of the calculation with an corresponding parameter, say k1, k2,...k4, to run on one core. I want to use 4 nodes with 1 ...
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20 views

centos cluster set core/each_program

I'm using unix server (OS: centos5) and I'm using several clusters. Some clusters have 8 cores, other are 24 cores and etc. I execute jobs using this command. qsub -q cluster_name -d $PWD ...
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84 views

pacemaker hangs while stopping

I have recently installed pacemaker and corosync for managin a virtual IP. The thing is that when I want to stop a resource (Virtual IP) on all the nodes, the stop command hangs. [root@isis ~]# sudo ...
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26 views

How to replicate KVM for DR purpose?

I am looking to replicate multiple KVM servers from one data center to another data center. What steps with specific commands to be used to replicate one server so I can use that for others. Thanks ...
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43 views

CoreOS cluster for development / testing

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 ...
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1answer
52 views

Cluster Lock Manager without TCP/IP

I have 2 linux sharing same SAN disk LUN. There are many cluster files systems to manage lock/unlock. But all of them are using a seperate TCP/IP comminication. But I need a cluster lock manager ...
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190 views

About mem and vmem

I am working with a cluster machine running under linux. I have a shell script that uses mpirun to submit my jobs to the cluster machine. In that same script, I can choose the number of nodes that ...
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1answer
45 views

Is there a way to achieve context-dependent path names (CDPN) on NFS?

In my GFS clusters I use the CDPN feature to have separate chrooted /dev/log directories on separate cluster nodes: /home/ftpuser/foo: lrwxrwxrwx 1 root root 18 Sep 26 2010 dev -> ...
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121 views

Tomcat7 cluster don't replicates session

I have a Ubuntu with 2 Tomcat7 with a cluster configurations. The balancer is Apache MOD_JK. SERVER.XML: <Engine name="Catalina" defaultHost="localhost" jvmRoute="no0"> <Cluster ...
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92 views

Microcomputer cluster for stress testing

I'm looking to build a microcomputer cluster at work for stress testing one of our applications, and while I have a little financial leeway, I would like to keep the cost low and the computing ...
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1answer
83 views

Powerful Workstation

I heard about ILM's (Industrial Light and Magic) workstations on which they create models and scenes for a lot of different movies. They have workstations with more than 1024 GB of ram and a lot of ...
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68 views

SGE to PBS/Torque qsub conversion

Hi I am setting up a software pipeline (an extensive bioinformatic annotation tool) that was originally written to submit SGE jobs but I am on a PBS/Torque cluster. Any ideas about a way to convert ...
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2answers
69 views

Gather job usage information on cluster

I am running simulations on a linux cluster shared by hundreds of other users. There is a job scheduler installed on the cluster that determines who runs where, and one of the scheduler commands ...
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1answer
2k views

How do I distribute a large download over multiple computers?

I need to download a large file (1GB). I also have access to multiple computers running Linux, but each is limited to a 50kB/s download speed by an admin policy. How do I distribute downloading this ...
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1answer
49 views

How much space for /home on a hadoop cluster? [closed]

What is a reasonable size to provide for a /home partition for 100 users on a hadoop cluster? Assume that a landing zone has been provided to store files/data for ingestion into the cluster, so the ...
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185 views

Running shell script on cluster in parralel

I thought dsh(Distributed Shel) will be a good option but when i ran my shell script across my nodes, I didnt get expected output, dsh -aM -c bash /home/cloudera/bash_script.sh server2@x.x.x.110: ...
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43 views

Mysql Cluster Data node not started

I am working on Mysql Cluster in Fedora. I have three Fedora virtual machine. One is Management node and other two are Data node. My Management node started but my Data nodes are not started. When ...
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1answer
105 views

SED and PDSH: adding a line to a file on a slave node in a cluster

I am trying to add a new line containing GATEWAY=10.0.10.1 to the /etc/sysconfig/network file on each of 32 slave nodes in a cluster. I read this post on how to insert a line with sed. This works for ...
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1answer
83 views

Configuration management, shared files, etc with a Laptop

I have a couple computers sitting around in my home network. They all run the same version of Ubuntu, and I would like to unify their configuration to some extent. At my university, you can log in to ...
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3answers
554 views

Multiple tar processes writing to the same archive file at once

I am running many tasks on a Linux cluster. Each task creates many output files. When all tasks are finished, I run something like tar cf foo.tar output_files/to create a tar archive. This is a very ...
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87 views

Takeover delay in Heartbeat HA cluster

I have set up a heartbeat HA two node cluster. And both of server have same configuration of ha.cf #cat /etc/ha.cf logfile /var/log/ha-log autojoin none bcast eth1 warntime 20ms deadtime 40ms ...
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23 views

Is it possible to install RHEV on el6 clustered computer

Is it possible to use Linux (el6) clustered computer can be used as a hypervisor for RHEV 3.3/Ovirt 3.3? Cause, we can not combine RAM/CPU from two or more hypervisores to be considered as a one ...
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1answer
4k views

usr/bin/xterm Xt error: Can't open display: /usr/bin/xterm: DISPLAY is not set?

I'm trying to submit a job to a school server (HPC) with: #!/bin/bash #$ -S /bin/bash #$ -cwd #$ -o ./out_$JOB_ID.txt #$ -e ./err_$JOB_ID.txt #$ -notify #$ -pe orte 1 date pwd ...
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1answer
46 views

NFS file with same name but different content depending on host

I have cluster using NFS with a program myprogram which writes to a fixed location, e.g. /home/sharedfs/somedir/somefile.txt. This means that if you run myprogram from each node, they all write to the ...
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1answer
75 views

CentOS VM 3972 Segmentation Fault

I'm trying to install MATLAB 2012 on CentOS 5.8 running on a VM cluster. I was able to mount the .iso file, but when I run ./install, it was unable to write to /tmp giving the error, "no space on ...
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49 views

HA Cluster in Linux [closed]

My question is : Is there any other solution for High Availability Clustering in Linux like RedHat Cluster Suite, or not ? Thanks..
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0answers
27 views

heartbeat stops after reviving primary node

I followed these steps correctly, everything worked well before I have revived heartbeat on node01 "at the last steps of the tutorial" when I hit /etc/init.d/heartbeat start it started correctly but ...
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1answer
186 views

What software should I use to create a HPC (High performance compute) cluster with CentOS 6.5 VMs locally?

I've read about Torque, Slurm resource managers and Maui, Open Grid scheduler, Sonf of Grid Engine but I do not know which is more appropriate to use in a local environment? I've also read that I need ...
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1answer
346 views

Fencing VM nodes

I'm using VMware Workstation as my hypervisor. I want to create a cluster with two nodes and a sharing storage with FreeNAS. My questions are around fencing. Is it possible to do it in this case? ...
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1answer
47 views

Will having dozens of inactive logins hurt performance

I work on a cluster shared with ~20 users, many of them operating remotely. It's quite common to open the login node, type users and see ~100 users listed, mostly the same user logged in multiple ...
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1answer
977 views

what is the difference between qsub and ./

Can anyone tell me the difference between the following ways of submitting a script: $ qsub script_name.sh and ./script_name.sh What are the differences between the above two ways of submitting ...
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5answers
9k views

NFS Automatic Fail-over or Load-balanced or Clustering?

I've been using NFS (and it is the only one i know well in Network Files) for a few years. But still can not able to find out .. How to make NFS Servers in Clustered Design (or Load-balanced?) Or at ...