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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What can a Beowulf cluster help process?
So, my school has hundreds of old computers and a few gigabit switches. Coordinating with the head of district for my school, I've been granted permission to make a Beowulf cluster, using one, two or ...
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Does postgresql (server) setup a main cluster after installation? (14.04)
I'm surprised that installing postgresql on ubuntu doesn't give me a working postgres server setup immediately: it requires additional steps:
Setting up postgresql-common (154) ...
* No PostgreSQL ...
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ansible: How to avoid warnings
I am using ansible for monitoring my home computing net, which consists several Linux machines (x64 and Raspberries).
How can I avoid warnings from every Raspberry client?
[WARNING]: Platform linux ...
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Is it possible to disable ipv6 using cloud-init?
I have a cluster of raspberry pi's and I am updating the os from raspian to ubuntu 20.04. I am able to configure a static ip address and name server, but I can not figure out how to disable ipv6. The ...
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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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Can't SSH devices within sub net
I have three computers set up like this:
But I am having issues understanding how to setup the /etc/network/interfaces for each device so that they can all access the internet.
I have tried this:
...
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MicroK8s failed to join RPI cluster error code 500
Error 500
Hello I'm halfway through my uni dissertation and stumped as I can't for the life of me figure out why the designated leaf nodes can't join the master node's cluster? I'm following the ...
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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 like:...
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Is there a lite version of Ubuntu on Raspberry Pi?
I'm going to build a cluster of Pis. But before I order the SD cards, I want to know if there is a lite version of Ubuntu so that I can use smaller SD cards. Raspberry Pi OS lite is a smaller OS which ...
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ocfs partition creation failure
I am trying to create a cluster file system shared by two devices. I am seeing the following error:
mkfs.ocfs2 successful
mount.ocfs2: Cluster name is invalid while trying to join the group
Stopping ...
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After badblocks found read error, the Reallocated Sector Count wasn't updated
My HD had a few corrupted files so I wanted to check all the sectors and have the HD controllers mark the failing one.
Following the advices from this answer, I have run a badblocks on my external HD. ...
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LXD Snap stuck on "undoing"
I use LXD for my cluster and I can't access it for a couple of days, because the LXD versions are incompatible across the cluster. In one of the node it's upgraded to 4.3; but on the other one, it's ...
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How can I persistently change nfs-kernel-server grace period settings?
I have a pacemaker with corosync nfs cluster (Ubuntu 18) and I'm trying to decrease the grace period.
Is there any way to make these settings persistent in /etc/default/nfs-kernel-server or pacemaker?...
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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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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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Managed vs. Unmanaged switch for Beowulf cluster
I am setting up a very small Beowulf cluster with one master node (my Lenovo laptop) and two server nodes (Dell Optiplex 760s), all currently with Ubuntu 14.04. Can I get away with using an unmanaged ...
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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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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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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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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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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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Ubuntu MAAS & Juju redundancy [closed]
I am planing to setup an Ubuntu cloud based on MAAS and Juju. It looks promising so far, but I didn't understand how it handles redundancy.
MAAS split network topology
There are seven physical ...
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Is a Beowulf cluster a solution for me?
Background
I'm an undergrad working on an scientific experiment.
Till now I was pilot testing our one of the program on Ubuntu 12.04 and now I need to deploy it.
The PC on which I tested the program ...
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how to integrate multiple machines as one system?
As the title. What I wish to get from this is:
1. the four nodes works like only one computer, i.e., one root, one system, one bash, one updates for all machines.
2. once a user is logged in, it is ...
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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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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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Uninstalled Kubernetes but I keep getting: "unable to resolve host slave-node"
I recently installed Kubernetes with helm and tried to setup a cluster on my Ubuntu 16.04 unity, I setup 1 master node and 1 slave node.
I removed everything related to Kubernetes, but everytime I ...
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How to use MAAS to render
I want to build a cluster for rendering my projects i do in Blender 3D. I do not want to use the network render addon because it is a little bit boring and it also can not support single image. So I ...
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How to control multiple computers from one? [closed]
Once I saw a friend who had created a study room where there were 10 PCs running Ubuntu. From each one of the PCs you could login into your personal account. There was also an 11th PC which was was ...
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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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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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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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Installing Spark Cluster
I am following this tutorial to install spark cluster.
http://arnesund.com/2015/09/21/spark-cluster-on-openstack-with-multi-user-jupyter-notebook/
I am manually copy pasting all the commands as I ...
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Softwares for clustering of machines
I have taken up a project in which I have to setup a server(any kind of server) and desktop computers such that the server can use the processors of other computers for computations(or other tasks) ...
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Clusters and HDDs
As a student, I run a cluster using ubuntu server in my college.
As you may already know, each computer of this cluster, have HDDs, and I'd like to create one single HDD for the cluster...
I'm ...
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Cluster for rendering
How can I build a cluster for rendering without scripting? It should be a very easy solution and there should be only free tools and of course i would like to use ubuntu.
Thanks!
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Is there a way to combine processing power of 2 PC?
I have recently received an old PC from my friend. My current plan is to use it as a file server, but it feels like it is not fully utilizing the processing power of this second PC. Is there a way to ...
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Orange PI 5 Diskless cluster
I previously asked and answered a question about how to boot a Rpi4b completely diskless and Id like to achieve the same result with an Orange Pi.
Raspberry Pi - Diskless Cluster using Ubuntu 20.04.1
...
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Windows Subsystem Linux cgroup issues with slurmd
I am trying to add my computer running Ubuntu WSL to a slurm cluster I have, made up of old laptops. And when I run
sudo service slurmd start
it comes back as failed. I checked the /var/log/slurmd....
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Random erroneous characters when writing to an ocfs2 drive
I look after a cluster of servers running Ubuntu 20.04. Each one has their drives exported via NFS to other servers. They are ext4 file systems.
Also, we have a disk array (i.e., a SAN) which has ...
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SG cluster installation
I'm having a problem when trying to run the package (service guard cluster)
cmrunpkg -n
bellow the log file telling me the error:
Mounting /dev/vg01/lvol01 at /example
mount: special device /...
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Connect Multiple nodes for hadoop via ssh on ubuntu
We are trying to set-up a two-nodes hadoop clusters on two different machines.
SSH to localhost without password have been setted up on both machines. And hadoop can run well as single node on each ...
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cifs utils - SMBmount to MS file cluster
i'm working at a company with many linux machines connected to a windows SMB share.
I'm migrating data to the a new (2019, but also on 2012r2) windows file cluster so we can have HA.
When triggering ...
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1
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juju bootstrap gives this error: failed to create dqlite connection
I'm trying to bootstrap juju on a lxd cluster cloud
Here the transcript of the command
sysop@kvmnode1:~/SVILUPPO/for_juju$ sudo juju bootstrap lxd-cloud ...
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LXC cluster: failing to start the first node after reboot
I have a LXC cluster with three nodes that are all KVM virtual machines with Kubuntu 18.04 with LXD 3.0.3 installed via apt
Also the host machine is a Kubuntu 18.04
I installed LXD on the first node ...
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DRBD8 with Systemd-Networkd (Netplan)
This is the first time I am configuring DRBD(drbd-utils 8.9.10-2) on a Ubuntu 18.04 with systemd-networkd (using netplan).
Generally the setup seems successful. I have one resource that is being ...
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Galera cluster load balancer deployment
We have multiple website connecting to a single server running MariaDB - 10.3.11and due to heavy load, we decided to implement Galera Cluster replication, which has been implemented and we got the ...
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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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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 ...
