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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Is there a way to properly create an etcd cluster on Ubuntu 20.04?

I'm trying to build an etcd cluster on three Ubuntu 20.04 VMs. I installed the apt etcd version: etcd Version: 3.2.26 Git SHA: Not provided (use ./build instead of go build) Go Version: go1.13.7 Go OS/...
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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; ...
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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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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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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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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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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 ...
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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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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 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 ...
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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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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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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 ...
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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
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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 myname@XXX.YY.WW.ZZ:/work/myname However, I would like to submit a ...
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2 votes
1 answer
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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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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 ...
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3 votes
1 answer
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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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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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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 ...
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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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2 answers
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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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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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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 ...
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1 answer
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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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1 vote
1 answer
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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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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, ...
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1 vote
1 answer
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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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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 ...
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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-...
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Installed Hadoop in fully distributed mode and unable to run datanode daemon on one of the datanodes

I created 3 datanodes in hadoop , fully distributed mode. and accidentally used 'hdfs namenode -format' in one of the data nodes and i get this error: 172.31.17.100: ERROR: Cannot set priority of ...
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3 votes
2 answers
529 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 ...
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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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1 vote
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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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1 vote
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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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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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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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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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2 votes
1 answer
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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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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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2 votes
1 answer
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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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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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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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2 votes
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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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1 vote
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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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2 votes
1 answer
2k 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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