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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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Chrony /NTP server

what would be the best solution, to install a local NTP server in a cluster mode, like: ntp1, ntp2 and ntp-master. The plan is to setup all the machines using the ntp-master IP, and this one has to ...
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80 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. ...
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3answers
344 views

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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22 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 ...
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30 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 /...
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61 views

Virtual machine over clusters/boxes

How can I create clusters/Linux boxes with Ubuntu Server and link those as big resource (even hdmi for graphic content) for virtual machine?
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1answer
5k 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 ...
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339 views

High Availability “Username / Password Incorrect” during PCS cluster auth

I'm currently attempting to configure high availability on two Ubuntu SQL Servers. Following this guide: Configuring Availability Groups in Ubuntu I've set a password for the hacluster account and ...
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17 views

What is the correct procedure for upgrading OS and application server on two-node failover HA Pacemaker cluster?

I've scoured enough search engine results before coming over. Looking for the correct procedure to upgrade an Ubuntu server and an application server on a two-node failover HA Pacemaker/Corosync/DRBD ...
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52 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 ...
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1answer
41 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
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1answer
204 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 myname@XXX.YY.WW.ZZ:/work/myname However, I would like to submit a ...
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1answer
205 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 ...
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1answer
1k 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 ...
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1answer
674 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 ...
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87 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 ...
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58 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 ...
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2answers
1k 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?...
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2answers
375 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 ...
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0answers
35 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 ...
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1answer
76 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 ...
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1answer
279 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 ...
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0answers
185 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 ...
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1answer
157 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 ...
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1answer
1k 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, ...
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1answer
325 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 ...
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199 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 ...
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1answer
528 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-...
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0answers
102 views

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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2answers
400 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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151 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 ...
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1answer
1k 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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1answer
6k 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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1answer
190 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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799 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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86 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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1answer
1k 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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0answers
203 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
175 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.
2
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1answer
43 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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0answers
218 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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0answers
47 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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0answers
83 views

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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0answers
44 views

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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0answers
50 views

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
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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1answer
781 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
764 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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0answers
225 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
31 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 ...