Questions tagged [cluster]

A computer cluster consists of a set of loosely connected computers that work together so that in many respects they can be viewed as a single system.

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How To Setup A Compute Cluster [closed]

for the last couple of days, I have been researching how to create a compute cluster with Rasberry Pi to compile and run resource-intensive programs (Like compiling kernels or running hash cracker ...
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Do Galera (or MSSQL) support this clustering scheme?

Clustered databases can be scaled relatively easily. However, even assuming zero latency to spin up a new instance, there is a considerable delay before the newly added node is ready to serve requests....
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Galera replication when two nodes can't communicate

Let's say I have a 3 nodes Galera cluster with MariaDB composed of servers A, B and C. Server A and server B can't communicate between each other but both servers can communicate with Server C. How ...
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Veritas VCS Cluster Detection on Windows

As part of a monitoring solution, we have been relying upon the presence of below registry keys to detect presence of a VCS on Windows, HKEY_LOCAL_MACHINE\SOFTWARE\VERITAS\VC HKEY_LOCAL_MACHINE\...
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2 Node — KeepaliveD — network break

I have a two node ( VMs ) setup running keepaliveD. The problem is that due to only ability of managing the VMs from command line, I can't demonstrate how the network break between both node-A and ...
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Failover cluster of 2+ servers for disasters with only 2+ physical machines

TL;DR: Question in bold below Here http://www.howto-expert.com/how-to-create-a-server-failover-solution/ is an (I assume) old blog post, explaining how to setup 2 server machines (one master and one ...
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Pacemaker does not boot service after node switch

I am using two virtual Ubuntu servers (latest long-term) and both have equal configuration, and are running Squid services and pcs pacemaker corosync. I have two nodes Squid01 and Squid02 with one ...
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HA Cluster with PCS

I am using Ubuntu 18.04LTS. I can't seem to figure out why this cluster will not work. I believe the Corosync service is not starting. I started out with sudo pcs cluster setup --name cluster_test ...
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Several MaxScale instances connected to one MariaDB Galera Cluster

In short, I have one MariaDB Galera Cluster consisting of 3 nodes. I have 3 independent servers on which MaxScale running. Are there any disadvantages to connecting three independent MaxScale ...
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Redundant email server - can 2 different machines/ip addresses share the same mailserver hostname?

I would like to setup one primary server/machine to send+receive+search emails, and one secondary server/machine, located elsewhere on earth, to be able to send+receive+search emails as well, whenever ...
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Clustering/Session Replication tomcat 9 two different machine

I'm trying to configure Session Replication on two tomcats on separate EC2 (AWS) instances. I can't find any example on internet of such configuration. I've prepared configuration in accordance with ...
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What is meant by Multi-Cloud Clustering? Can anyone help me in understanding it in detail? Any helpful articles will be highly appreciated [closed]

Can someone help me in understanding what Multi-Cloud Clustering is? How can it be done and which are the best options for Multi-Cloud Clustering in the market today? Thanks.
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How to sync files and PHP sessions in real-time between two nodes?

I am setting up a PHP application in 2 nodes and one DB server. Also setting cluster (with HaProxy) which will route traffic on least connections algorithm between both nodes. The thing I am confused ...
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Glassfish 5 cluster creates JSESSIONID on each request

I am trying to configure a Glassfish cluster following the official HA guide. The app is a standard JSF app (with Primefaces). At first I thought that the problem was related to JSF itself, but then ...
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Configuring file share witness for cluster with Azure file share

I have built a Windows 2012 R2 failover cluster in Azure using a premium file share (https://docs.microsoft.com/en-us/azure/virtual-machines/windows/sql/virtual-machines-windows-portal-sql-create-...
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Multiple disks acting as one filesystem, while still allowing each disk to be accessed alone

I have a fairly large dataset (~160TB) that need to be delivered to a client every so often. This dataset consists of fairly large files, usually between 2Gb and 20Gb each. They exist on a BeeGFS ...
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ALB writing to 2 postgre sql instances

I have nginx and postgre sql running on the same ec2 instance. It serves a rails app that reads and writes data on that db. I would like to have 2 instances behind an ALB service to distribute load ...
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About mail server and imap ha active-active cluster

I have setup a mail server, for testing. My goal is to have a HA mailserver with imaps, when a client connect to a virtual ip, it redirect to two real servers, if a real server crash the other real ...
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Clusweb7.vbs IIS CLUSTER

I would like to ask if the Clusweb7.vbs script is mandatory on a IIS cluster created with 2 nodes Windows 2012. Basically I created the cluster and create the resource of my webapp and copied the ...
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Active Directory as uid/gid provider within a cluster

I have a CentOS 8 HPC cluster setup with a login node that is connected to an active directory via sssd/kerberos. Only the login node is accessible from the user network. Users use their normal domain ...
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corosync joins cluster then times out

I have a cluster of 10 servers running Fedora 30. I am trying to build a ISCSI share that all servers can access. NAS: ISCSI LUN formated as GFS2 I have managed to do this and all is working as it ...
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Windows 2016 Failover Cluster Client Access Point 'Binding'

I'm having a network issue with a couple of HA roles when failing over to one of the two nodes in my cluster. Here's my setup, this is not new, been running since 2016 but this problem is new, not ...
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Openstack magnum cant reach clustertemplates?

I am having a bit of trouble with magnum on my devstacks openstack install on BARE METAL Ubuntu 18.04. When i try to create a cluster template with kubernetes like this: magnum cluster-template-...
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PostgreSQL version of Percona XtraDB Cluster (master-master cluter)

Is there a "feature compatible" version of Percona XtraDB Cluster, but for PostgreSQL? I looked high and low but wasn't able to find comparable edition of PostgreSQL cluster. Is Percona really the ...
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mariadb galera cluster, resync nodes behind

I've followed this tutorial, and have a 3 server cluster set up behind a NGINX reverse proxy. https://www.digitalocean.com/community/tutorials/how-to-configure-a-galera-cluster-with-mariadb-on-...
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Query peak GPU memory used by finished job

I have a SLURM job I submit with sbatch, such as sbatch --gres gpu:Tesla-V100:1 job.sh job.sh trains a model on a V100 GPU. The code itself does not log GPU memory usage. Is there a SLURM command ...
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Istio & K8S - Ingress with IPv6 and IPv4

We are currently evaluating a K8S (version 1.17 using CRI-0 version 1.17 & Calico CNI) installation using Istio 1.5.0. All nodes have a valid and reachable IPv4 and IPv6 (ubuntu server 18.04 - on ...
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Redis pub/sub - cluster vs multiple single instances

I am new to Redis, so bare with me, if this question is very basic. I have the need for a publish/subscriber pattern. I need it for A) notifications between entities to lower some latency in an ...
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Ubuntu server vs Ubuntu desktop for Beowulf cluster

I want to create a beowulf cluster using Ubuntu 18. Looking at some guides they all seem to use ubuntu server for this an my question is why? Is it not possible to use ubuntu desktop for the client ...
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ocfs2 multiple disks cluster heartbeat

I want to share several ocfs2 file systems between several application servers. Do I need to create global heartbeat for each file system, or is one global heartbeat enough?
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FortiManager overwrites settings on HA unicast heartbeat interface

I have an HA cluster of two FortiGates (v6.0.9) managed by a FortiManager (v6.0.8). The FortiGates run in a cloud, so I must use unicast heartbeat on HA interfaces to sync them. I use port10 on both ...
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Istio components are not getting installed on a private GKE cluster

I'm trying to install Istio on a private GKE cluster. I have downloaded the version 1.4.3 of Istio and then applied the default profile. But not all the components are getting installed from the ...
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Public service failover in a cluster

I'm getting started with physical server clustering, and have plans for a 3 node hyperconverged oVirt setup. I currently deploy all my apps and sites on VPSes and API-provisioned cloud instances. I ...
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How to manage many identical instances of a MySQL schema over many machines? [closed]

I'm working on a project that has a MySQL database schema that's used on three different servers (MySQL databases) into 20 copies of the schema for each server (which are all identical in form but ...
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How to identify the cause of reboot as the log was not captured in a SLES 12 SP3 (2 node cluster)?

Currently, a failover occured from node 1 to node 2 as there was a sudden reboot on node 1. Upon analyzing the log, it is found that the reboot log was not captured and also kdump was not configured ...
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Torque - get number of CPUs allocated to running jobs

I'm looking for an option to format Torque qstat output so that I get only the number of allocated to running jobs. Here's how I do it in Slurm: squeue -h -j 12345 -t RUNNING -o "%C" where -h - no ...
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Get LV sanlock owner on a LVM shared VG

I am using a shared VG between my virtualisation hosts using lvmlockd in sanlock mode, and I have a simple question. When I try to activate a LV which is already activated on another hosts (here a LV ...
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postfix on the cloud without mydomain

I'm trying to make postfix server on a cluster (docker swarm). The postfix main.cf configuration needs mydomain but I'm not using a dedicated machine to domain name. I have 10 machines and 6 domains. ...
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Nodeport is not sending the traffic to service port in GKE private cluster

I have a private cluster created in GKE and gitlab is running as a pod in this cluster. Here, nodeport is not sending the traffic to service port and hence unable to push images to gitlab. Error ...
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Will InnoDB or NDB cluster boost performance

We have fairly large MySQL database (about 35GB total) and topping about 900qps. Performance is not a big issue for now, but the project is growing constantly and I'd rather start thinking about ...
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How to set up Kubernetes (k8s) environment on an open-wrt based node connected in a cluster?

Openwrt OS support ".opk" file format extensions for the packages to be installed on the top of it. For that k8s, kubelet binaries are availbale but the procedure is to generate an installable ...
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How does Azure handle TEMPDB on the local SSD when using WSFC to support an always on availability group?

How does Azure handle TEMPDB on the local SSD (drive D:) when using WSFC to support an always on availability group? I know that the local SSD, where it's recommended to place TEMPDB, is erased ...
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Linux RHEL cluster

I'm trying to setup a PCS cluster on two nodes running Red-hat, and did successfully, I want to setup syslog server (rsyslog) in Active/Passive mode. I created the cluster and added the resources, I ...
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How to create a SGE queue which can only be assigned jobs manually?

I have 5 nodes in an SGE cluster. I'd like to make it so one of those nodes can only be used by a specific queue, "test.q". I can remove that node from hostlist on all of my other queues, and set ...
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Can't run new Galera Cluster

I'm trying to run a new Galera Cluster on my local machine. I'm using CentOS 7 on Parallels Desktop. I followed all the instruction to bootstrap a new cluster but I keep getting this: MariaDB [(none)]...
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Resolved - Only 1 nodes out of 2 have registered on my node-pool if I have a GPU activated on my cluster

I have a managed k8S cluster with 1GPU (Tesla K80) activated in west1-b and west1-d (Each zone has this GPU model enabled, and my quota is ok). Each time that I create a node pool with 2 nodes only ...
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Connection failure on HACMP service address

I have Ansible 2.6.20 installed on a Oracle Linux 6.10 with Python 2.6.6 and I'm trying to configure IBM machines running AIX 7.2 with Python 2.7.15 in a HACMP cluster. Running ansible in console ...
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Create MariaDB cluster across 2 seperated OpenShift clusters

Good day, I am looking to create a MariaDB cluster in OpenShift/Kubernetes. The caveat, is that my cluster need to be ''spanned'' across 2 seperated OpenShift/Kubernetes clusters. I am trying to ...
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Creating Windows Cluster with Powershell

I have a Windows cluster provisioning script. I am not able to execute the New-Cluster command as Administrator. It says that the user should be a domain user to be able to execute the command. I m ...
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Proxmox: How to replicate runnable VMs

I am quite new to Proxmox 6.0 and just started to learn clustering. I am running a test environment with an HP Proliant and an IBM rackserver (both have just one fat partition and the dataformat is ...

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