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Questions tagged [cluster]

A computer cluster is a set of connected systems that work together so that in many respects they can be viewed as a single system.

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How to notify a package maintainer about upstream updates?

I am running a pacemaker, pcs, corosync and I've just found that the current ubuntu package "fence_agents" is not as updated as the upstream source by various versions. Specifically, I'm having ...
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What are the options available to create a cluster of Ubuntu 18.04 servers?

One of the server will be the management server and node can be added or remove from the cluster pool. So, what are the options to create a cluster of Ubuntu servers, say three Ubuntu 18.04 servers. ...
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How to apply updates to a HA cluster service using Landscape

We have a cluster of MariaDB servers that is managed using Landscape. What would be the best way to upgrade the cluster server by server instead of all at the same time? Surely, I could apply the ...
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Combining multiple computers processing power

Hi I am trying to achieve is basically to make another computer handle processing if my computer can't take it. I researched a bit asked some of colleague and most of answers were you can't really ...
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Execute commands with pdsh

I'm trying using pdsh to execute a bash script across all my nodes, but pdsh will not allow me to cd into directories and also does not allow me to execute python bash: python: command not found. How ...
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Rebooting MAAS Controller

I have a small cluster of 9 servers (one of which is the rack controller) all managed under MAAS. I have been able to provision a server and been using it for a while. Now, I am not able to login to ...
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1answer
48 views

How to specify ssh key with pdsh

I'm using pdsh, but can't find any documentation or examples of specify the ssh key. Usually, I do ssh -i ~/.ssh/mykey.pem <address>. How do I change the pdsh command pdsh -R ssh -w ^server.txt "...
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131 views

Could not resolve hostname datanode1: Name or service not known

I am building an SSH connection with my namenode and two datanodes on AWS. When I try to copy the config & my .pem file from namenode to datanodes, I get the following error: Could not resolve ...
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73 views

Gridengine: error: commlib error: got select error (connection refused)

I just installed gridengine & getting error when doing qstat: error: commlib error: got select error (Connection refused) error: unable to send message to qmaster using port 6444 on host "MyHost-...
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53 views

Mounting a Read-Only NFS file system with changes volatile across reboots

I'm developing a HPC cluster and can successfully NetBoot each node using PXELInux and mount a Read Only NFS file system from the master node using this example: https://alephnull.uk/build-linux-...
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1answer
51 views

mysql drbd error 2002

i'm trying to add a mysql server as a drbd resource on a server i have followed this tutorial futher more i have done the following sql on the master grant all on mysql.user TO ‘crm’@’%’ IDENTIFIED BY ...
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105 views

Two Servers One JBOD

I'm looking to create a clustered storage file server using Ubuntu 18.04. I have two physical servers and one JBOD with 36 disks. The goal is to setup failover file server with ZFS RAIDz2 pools on ...
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478 views

PXE boot Ubuntu 18.04 on a cluster with no internet

We're setting up a compute cluster at work that has a master node that we want to set up as a PXE boot server to do unattended installs of Ubuntu Server 18.04 on our cluster nodes that don't have ...
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25 views

multiple remote desktop sessions

I happen to have a cluster of virtual machines I'd like to access from a single Ubuntu 16.04 LTS laptop at once. I need to run tasks involving the use of GUI, and I have to pause and resume the ...
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509 views

libcuda.so.1 , libcuda.so.1 on cluster

I am working on Cluster and I loaded the following modules: 1) shared 7) cudnn/5.1 2) slurm/17.02.2 8) openblas/dynamic/0.2.18 3) default-environment 9) ...
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32 views

Problems after setting up MySQL Cluster on Ubuntu Server 16.04

I am fairly new to Ubuntu but I wanted to set up a SQL Cluster. I followed this guide exactly as it says: https://www.digitalocean.com/community/tutorials/how-to-create-a-multi-node-mysql-cluster-on-...
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30 views

Make a cluster in openfiler

To create a cluster between 2 openfiler servers, you must use drdb? There is no openfiler way to join an openfiler server with another openfiler server and the same content is copied to the discs of ...
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41 views

Openstack Sahara cluster error

openstack sahara cluster creation mounting volume error
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1answer
447 views

MAAS with external DHCP or Static assignment

TL;DR: How to set up MAAS, without the maas-server providing DHCP? I am having a problem with a MAAS cluster setup, since it's on a subnet that already has a DHCP/DNS provider on it, over which I do ...
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110 views

How to create a NAS/NFS distributed over multiple machines?

I have multiple mac minis running Ubuntu. I'm building a mini cluster. Each has a medium sized drive. I was wondering if there was a way I could turn a portion of each drive into a shared NAS/NFS of ...
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1answer
117 views

How to configure MaaS clusters?

When I log in to MaaS and configure clusters I get this error: I want to know how to configure clusters correctly.
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1answer
41 views

Enlarge/Migrate a Raid5

Situation: We have two Dell servers running as a cluster. Each of the servers runs a RAID-5 system with actually 5 * 600GB. The data AND the base system itself are stored on the RAID. Goal: Now we ...
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141 views

Is there a version of OSCAR available for Ubuntu 16.04?

I'm planning on creating my first Beowulf cluster computer, both my PCs are running standard Ubuntu 16.04, I have heard that you can create clusters using OSCAR, but on their website they only say ...
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33 views

Error while mounting root in node of a cluster

I was trying to make a cluster on VirtualBox, wherein while performing the mounting part, I was getting this error mount.nfs: failed to resolve server master. Name or service not found. My commands ...
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Computer Clustering

I know this question has been asked earlier but am not able to get a simple step by step answer. What I need is : Create a seemless Cluster where I would Use 1 Laptop as Main PC where I can work on ...
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Install MAAS on productive system

I'm running 16.04 LTS with 3 VMs. Got some other servers I might Cluster together with MAAS. Is it possible to install on the Master productive machine the MAAS and cluster the different servers ...
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MAAS deployment without formatting secondary disks

I manage a cluster of computers used for scientific computing using MAAS 2.1. Each node has a 500GB SDD that holds the OS and serves as scratch space for computation. Additionally, each node has a ...
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1answer
1k views

Is there a 16 core limit in Ubuntu 16.04?

I have a Beowulf Super Computer consisting of (4) Dell PowerEdge R610 each with 2xQuad Core Xeon E5640 processors @ 2.4Ghz I also have MPIv3.2 installed for parallel messaging. The master node has ...
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1answer
346 views

How to define the path to MPICH for SSH?

I have diploma thesis and follow steps from this manual: Building a Beowulf Cluster in just 13 steps. I have a problem with step 11: Now we'll define the path to MPICH for SSH. Run the following ...
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1answer
542 views

Ubuntu Server 16.04 cluster with infiniband?

I have freshly installed Ubuntu Server 16.04 on a Dell T3500 as the master node and I am planning to add 4 compute nodes to the cluster. There is one ConnectX-2 HCA (dual port) card in the T3500 and ...
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158 views

I am installing Nbd cluster in my system

I run this command:- sudo dpkg -i mysql-cluster-gpl-7.4.11-debian7-x86_64.deb And i got error:- dpkg: error processing archive mysql-cluster-gpl-7.4.11-debian7-x86_64.deb (--install): cannot ...
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0answers
29 views

How to update a small office of Ubuntu computers without downloading multiple copies of updates? (Ideally unattended) [duplicate]

I've used unattended and scheduled updates via root cron and am looking to perform updates on a larger scale (using command line: non gui). Ideally it would download the updates from the ...
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239 views

Mysql cluster setup

Can anyone guide me on setting up mysql cluster on 3 ubuntu 14.04 systems. One being Management node and other 2 being Sql nodes.
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936 views

Configuring Ubuntu as a router and DHCP server

Long story short, I've got a compute cluster, and it needs to connect to the Internet through the master node. Each machine needs to be port forwarded. I would like them to receive IPs via DHCP for ...
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1answer
234 views

Ways to install programs in large clusters

For my internship I am currently setting up a cluster of laptops to run CFD applications using OpenFOAM. So far I've set it up installing SSH-client and NFS on both master and nodes. I've tested both ...
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1answer
438 views

Problems with mpirun (openmpi)

I have locally installed two openmpi versions on my cluster: openmpi-1.8.1 : when I run mpirun under this version, it gives me an error: librdmacm: Fatal: unable to open RDMA device librdmacm: Fatal:...
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1answer
8k views

Invalid user error using chown

I am running into an issue where when I type in sudo chown, I am recieving an invalid user error. I created a user called clusterUser using the GUI. In the root directory of the computer (/), I ...
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2answers
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No Private IP address. Need help to fix

I have an IBM bladecenter with 5 blades installed. Internally, the blades are connected to each other (I know this becuase I have a second one and I do not have this problem). However, when I go to ...
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16 views

Installing nfs-server package [duplicate]

To make a long story short, I have a small cluster that I will be setting up as an MPICH cluster. However, the cluster will not have an internet connect so, I will have to transfer the files via usb ...
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1k views

Which Cluster Filesystem / Distributed Filesystem for Ubuntu 16.04

I have 5 servers, 16 threads running on each of them, producing a total of 80 files at the same time, which should finally be available for every other server in the same folder (it is a MPI ...
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1answer
318 views

mount cephfs did't work after reboot

I added this line: 10.10.10.10:6789:/ /mnt/ceph ceph name=admin,secretfile=/etc/ceph/secret.key,noatime 0 2 to /etc/fstab in all of my nodes and executed "mount -a" and works good ...
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How to use one machine as master in a cluster

I made a cluster using CSSH contains 10 machines in a network inclusive the machine that I use (currently opened machine) and the IP addresses are stored in /etc/clusters , after I opened them using: ...
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1answer
4k views

0-glusterfs: failed to get the 'volume file' from server

How come I'm unable to mount glusterfs brick? Any idea? Ubuntu 14.04, glusterfs 3.4.2 $ sudo mount -t glusterfs webdir /var/www/ [2016-05-31 07:23:24.201840] C [glusterfsd.c:1406:parse_cmdline] 0-...
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1answer
367 views

I have a cluster of computers, how do I setup ntpd so they all have nearly the same clock?

I have 4 computers, one is considered the master (direct connection to the Internet) and the others are considered slaves (for those the master adds one extra hop to any external communication.) At ...
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1answer
728 views

Where is the cluster tab in maas?

That might sound like a silly question but where is the cluster tab? I can't find it on Mass web GUI Version: 2.0.0~beta3+bzr4941-0ubuntu1. Here's the actual nav bar: and this is the one I should ...
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1answer
5k views

Creating internal Network among VMs and Internet from Host Machine Virtual Box

I have 3 Ubuntu Server VMs on VirtualBox with static IPs on eth1 interface: 192.168.56.2 192.168.56.3 192.168.56.4 I have chosen Adapter 1 as NAT and Adapter 2 as Host Only for all VMs Now to ...
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1answer
385 views

have problem with ceph fs mount

I want to mount CephFS with the kernel driver, but when I execute this command on my admin node mount -t ceph 192.168.0.164:6789:/ /mnt/mycephfs The admin node hangs! and I have to reset my machine. ...
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2answers
208 views

ceph fs mount error

I want to mount ceph fs with the kernel driver, but when I excute below command on my admin node mount -t ceph 192.168.0.164:6789:/ /mnt/mycephfs it return below error mount error 5 = Input/output ...
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1answer
147 views

Openstack autopilot test drive alternative to vsphere?

I want to try openstack with autopilot test drive and I am trying to setup a cluster with vms. VSphere is not supported on ubuntu server is there any other alternative that I can use or somehow make ...
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How to get clvmd running on Ubuntu 15.10?

I'd like to get clvmd running on Ubuntu 15.10 which currently fails and failed (I'm summarizing resolved issues as well) due to failure of start of service clvm because of missing ~/etc/init/...