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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 access own computer drive when using puTTY on a cluster

I am completely new to this (""coding"" and such), so this may be one of the most basic questions asked around here but couldn't find the answer anywhere and have been struggling ...
Thibault's user avatar
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166 views

software for HPC cluster management

We have a small cluster of about 40 nodes running RHEL 6. This cluster is managed using rocks which is convenient. To shut down the nodes, all I do is: rocks run host halt I can also install ...
wander95's user avatar
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NFS cluster with pacemaker and corosync fails with stale file on failover

I have a 3-node pacemaker-corosync cluster on ubuntu 22.04, managing some nfs shares. I share two different glusterfs (for sharded storage on the three nodes) volumes (one ssd, the other hdd): ...
Nicola Urbinati's user avatar
0 votes
1 answer
212 views

Pacemaker with scsi fence device

I'm trying to setup a 3x nodes cluster with corosync and pacemaker, with scsi fencing. I do not know why the cluster status says there's no fencing device, while the fencing device is actually there: $...
Nicola Urbinati's user avatar
1 vote
0 answers
521 views

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 ...
cytsunny's user avatar
  • 165
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0 answers
31 views

Problem with connecting with remote database

Hello there I have a question about connecting my website with my database on another server on the same network. My database uses a cluster-based system with MariaDB and my website uses apache2. I ...
daan's user avatar
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0 votes
1 answer
1k views

Kubernete Pod cannot resolve DNS address but can reach it (example curl google.com fails, curl ip is ok)

I'm just starting out and i've been learning kubernetes since couple of weeks ago, i'm using a plain installation of microk8's with addons dns metallb enabled, and a simple pod with alpine with curl ...
Hero Kato's user avatar
1 vote
0 answers
539 views

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 ...
Tom Shaw's user avatar
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1 answer
1k views

Multiple redis ubuntu 20.04 LTS

Can who explain, what's wrong with redis?) # systemctl status m1-redis ● m1-redis-server.service - Advanced key-value store Loaded: loaded (/lib/systemd/system/m1-redis-server.service; enabled; ...
Tsunani's user avatar
  • 11
2 votes
1 answer
2k views

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 ...
user135142's user avatar
1 vote
0 answers
415 views

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....
SCossano's user avatar
1 vote
0 answers
24 views

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 ...
Ray's user avatar
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1 vote
1 answer
836 views

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 ...
Federico Gentile's user avatar
2 votes
1 answer
2k views

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 ...
Divija Gogineni's user avatar
0 votes
1 answer
148 views

What's the fastest way to distribute a large file between a fleet of machines?

Imagine you run a highly parallel service which requires you to sync a large file (let's say 100GB) between many machines (let's say 100) on a regular basis, and you want to get this data distributed ...
Wug's user avatar
  • 129
2 votes
1 answer
3k views

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. ...
MagTun's user avatar
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3 votes
3 answers
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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 ...
115MPH's user avatar
  • 31
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0 answers
37 views

What is the Best Way to Start Closed Galera Clusters?

I have a 3-Cluster Galera replication and last day electricity has gone off. When I started the Mariadb servers, I saw that cluster could not start, three of them failed. I edited the grastate.dat and ...
TarabydaVllasıCafcaflıAtArabsı's user avatar
1 vote
0 answers
55 views

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 /...
Rafael C's user avatar
6 votes
1 answer
21k views

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 ...
Pascal Klein's user avatar
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0 answers
190 views

Linux system + bootable windows on a USB: How to run?

I installed a bootable windows 10 on a usb key. Now, the question is how to use the windows without leaving the linux. My purpose to use a windows is to have access to a cluster with a VPN. The ...
user790082's user avatar
0 votes
1 answer
401 views

Clusterssh with publickey [closed]

how to login vps with sshpublickey with clusterssh ? if i using 2 vps with password command clusterssh username@ip username@ip so how to using publickey ? i use ubuntu 16.04 thank you
Joe Cola's user avatar
  • 353
0 votes
1 answer
1k views

transfering data from one cluster to another

I would like to transfer my data from one cluster to another. for that, I know that I can write on the command line: scp -r Folder1 [email protected]:/work/myname However, I would like to submit a ...
user790082's user avatar
2 votes
1 answer
669 views

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 ...
Danial Behzadi's user avatar
0 votes
1 answer
5k views

Cannot install tftpd-hpa

I'm trying to run apt-get install dnsmasq pxelinux syslinux-common through a cluster control node, and keep getting this error while installing. Job for tftpd-hpa.service failed because the control ...
AJ_4real's user avatar
5 votes
1 answer
5k views

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 ...
Lateralus's user avatar
  • 151
1 vote
0 answers
194 views

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 ...
Isaac P. Liu's user avatar
0 votes
0 answers
94 views

Cluster management

Is there any tool or way to get the hardware and storage details of every computer within a connected network ? I am able to view only list of connected computers within a network. But I also want to ...
Nilesh's user avatar
  • 11
2 votes
2 answers
3k views

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?...
Killertjuh's user avatar
1 vote
2 answers
605 views

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 ...
Lynob's user avatar
  • 6,685
1 vote
0 answers
92 views

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 ...
Martijn F's user avatar
0 votes
1 answer
100 views

Openstack deployement

I work in a private cloud project with openstack for my internship, my concern is that I have 12 servers in which I must have a controller node, compute node, network node, storage node where I have ...
Donald Yams's user avatar
1 vote
1 answer
358 views

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 ...
Mirto Busico's user avatar
1 vote
0 answers
272 views

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 ...
Mirto Busico's user avatar
1 vote
1 answer
291 views

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 ...
Topiyobol's user avatar
0 votes
1 answer
2k views

MariaDB 10.3.3 Galera cluster adding new node in existing cluster # WSREP: Waiting for SST to complete

I am trying to add new galera cluster node in existing MariaDB Master-Master setup, but i am seeing SST waiting for longer time and mariadb services failing to start. services status output as below, ...
Gajendra Bhende's user avatar
1 vote
1 answer
472 views

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 ...
Kamal Joshi's user avatar
0 votes
0 answers
429 views

Run 2 Mac Mini's in a cluster and control them as one

I have 2 Mac Mini's from Late 2012 laying around and I wanna turn them into a cluster. Is this possible? If so, what do I need to do? I also would like to control them as one. I've read about a single ...
stingalleman's user avatar
0 votes
1 answer
808 views

Ubuntu server glusterfs and virt-manager

Trying to install glusterfs on 3 Ubuntu 18.04 servers. Everything works if i add it to fstab and mount the volume. No problem, read, write, delete. And it updates on the server. If i add it to virt-...
m-momr's user avatar
  • 1
3 votes
2 answers
890 views

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 ...
JuanKB1024's user avatar
0 votes
0 answers
424 views

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 ...
Soubriquet's user avatar
1 vote
1 answer
4k 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 "...
Soubriquet's user avatar
1 vote
1 answer
14k 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 ...
Salman Dalal's user avatar
0 votes
1 answer
317 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 ...
Fuseteam's user avatar
  • 393
0 votes
0 answers
2k 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 ...
Bensode's user avatar
  • 81
0 votes
0 answers
90 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-...
naikon's user avatar
  • 1
2 votes
1 answer
2k 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 ...
Zaki's user avatar
  • 29
2 votes
0 answers
226 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 ...
Jim McKeeth's user avatar
  • 1,832
0 votes
1 answer
183 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.
dreammove34's user avatar
2 votes
1 answer
50 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 ...
derHugo's user avatar
  • 3,366