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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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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9 views

MAAS HA cluster to Postgre HA cluster connection

I deployed a MAAS 2.7 HA cluster, sequentially composed of: 2 load-balancer (haproxy) with keepalive (virtualIP) for dashboard access/region controllers HA (port 80) 3 region controllers 2 load-...
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1answer
62 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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90 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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46 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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52 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
368 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
206 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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22 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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141 views

Apache2 Ubuntu server 18.04 pacemaker [failed to access httpd status page]

i got error when i create a apache resoure in pacemaker pcs resource create WebSite ocf:heartbeat:apache \configfile=/etc/apache2/apache2.conf statusurl=”http://192.168.56.103/server-status” op ...
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1answer
48 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
187 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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112 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
131 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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742 views

Problems in executing mpi with machinefile Ubuntu 18.04

following these guidelines MpichClusterUbuntu, I'm trying to execute my very first mpi program with a PC with Ubuntu 18.04.01 Server Edition and a laptop with Ubuntu 18.04.02 Desktop. Till step 11 of ...
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1answer
977 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
239 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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133 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
346 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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96 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
260 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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72 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
967 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
3k 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
164 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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514 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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81 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
915 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
200 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
162 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
42 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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210 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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45 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
82 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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43 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
42 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
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
579 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
729 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
214 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
30 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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292 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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2k 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
421 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
617 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
21k 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
120 views

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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0answers
20 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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0answers
2k 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 ...
2
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1answer
702 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 ...