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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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Dual Controller OpenStack cluster

Hello I have two servers on which i intend to install a multi-node devstack Question is i want it to have some sort of availabilty ie when the controller node goes down the normal one can takeover ...
Fantarina's user avatar
1 vote
0 answers
40 views

Apisix kubernetes Discovery not work

I am using official helm chart to install the APISIX in my Kubernetes. I only override the following values from the official helm chart: useDaemonSet-> true serviceAccount -> set create to ...
paddy's user avatar
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1 vote
2 answers
96 views

Rook Ceph storage and MySQL space very big difference

Can someone please advise me what could be the cause of this condition? I have a Rook Ceph cluster on which MySQL database with 3x replication is stored. This database is used by me for development ...
JDev's user avatar
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0 answers
42 views

Expose local kubernetes function to my pc

So I have a function running in my kubernetes cluster. NAME BUILDSTATE SERVINGSTATE BUILDER SERVING ADDRESS AGE minio-event ...
David Backx's user avatar
0 votes
1 answer
69 views

Windows Server 2019 is no longer activated after switching over to passive node [duplicate]

I am running Windows Server 2019 in Virtual Machine Manager on a Synology High Availability cluster. Today I switched the server to the passive node and now Windows Server 2019 is no longer activated. ...
Swisher Sweet's user avatar
1 vote
0 answers
30 views

Enabling vSAN on existing cluster in vCenter

I currently have 3 clusters in vCenter, all with their own ESXi hosts and VM's running on those resources. I want to enable and utilize vSAN within 1 cluster for now and then expand it throughout the ...
SystematicSavant's user avatar
1 vote
0 answers
186 views

ovs-vsctl stucks and seems there's no schema when using ovsdb in cluster mode

#!/bin/sh ovsdb-tool create-cluster /host/var/lib/openvswitch/conf.db /usr/share/openvswitch/vswitch.ovsschema tcp:0.0.0.0:6632 2> /dev/null ovsdb-server \ --unixctl=/host/var/run/openvswitch/...
Vahid Alimohamadi's user avatar
1 vote
1 answer
38 views

How keep storage synchronized between clustered web server

I'm working on a cluster of web servers that use local filesystem as storage for media files. These clustered servers are balanced. The served webpages gets some images or video from this repository, ...
Tobia's user avatar
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0 answers
180 views

AWS application load balancer not registering targets for Kubernetes EKS node target group

I have an EKS cluster with public/private access on a VPC with public and private subnets. I've setup my ALB in the public subnets on port 80, internet-facing and ip and installed the AWS controller ...
Alex Radwan's user avatar
3 votes
1 answer
114 views

Upgrade pacemaker corosync drbd Cluster from centos7 to almalinux

I have an active passive pacemaker Cluster for vms running with drbd 84 and corosync in centos7. AS centos7 eol is coming soon I am in the need of upgrading the cluster to a newer distribution. ...
shout's user avatar
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2 votes
1 answer
396 views

Ceph cluster mixing nvme disks with different sizes

I am deploying a ceph cluster, the cluster will have three controller servers and 27 osd nodes. Each osd node has 3x3.8Tb nvme + 1x1.9Tb nvme disks, for a total of 4 nvme disks per node. The failure ...
Wodel's user avatar
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0 answers
118 views

Deploy a Redis cluster in Kubernetes with High Availability

I am looking at deploying a Redis cluster (3masters, 3workers/slaves) on Kubernetes. I found the Redis Operator as being the best option but the “capability level” doesn’t look that attractive to me. ...
Jérémy Ferfer's user avatar
0 votes
1 answer
253 views

What is the setting to use on other nodes after force starting cluster on a certain node?

I'm learning about force starting a cluster in the event of a DR. https://learn.microsoft.com/en-us/windows-server/failover-clustering/manage-cluster-quorum#prevent-quorum-on-remaining-cluster-nodes ...
variable's user avatar
  • 259
3 votes
1 answer
86 views

Why is there random choice made in a 2 node + file share cluster when File share dies?

In a 2 node wsfc with file share witness, each node has got 1 vote, and the witness also has got 1 vote. Total 3 votes. Given that we have concepts of dynamic quorum, dynamic witness; when the file ...
variable's user avatar
  • 259
2 votes
1 answer
264 views

sge: How to set hard limits of node?

The guy who administrates our cluster died suddenly and recently, so now we have to operate it ourselves until a new guy comes in. We want to change the hard runtime limit of a node on our cluster. ...
Mikke Mus's user avatar
2 votes
3 answers
118 views

Setting up a cluster with workload distribution

I want to setup a server cluster which can keep by servers as busy as possible while still giving fair compute time to everyone. I have setup a basic Kubernetes setup but the issue is that if some ...
starhawk's user avatar
1 vote
0 answers
95 views

Does MariaDB-Galera cluster have error tolerance function on sst_user credential?

We have done the testing and confirmed the following system behavior of MariaDB-Galera clustering: The first-time bootstrap always needs to get everything correct, including the sst_user credentials ...
Mike's user avatar
  • 11
0 votes
0 answers
35 views

Receiving PDNS NOTIFY for domain I no longer host

On a couple of my servers in a DNS cluster running CloudLinux and PowerDNS, I've been receiving the following in my LFD Log Scanner Reports: pdns[2569215]: Received NOTIFY for example.com from 54.39....
NightOwl's user avatar
0 votes
0 answers
56 views

Deploying Multi-Cluster/Multi-Region Gateway AND have redundant stateful services with GKE Autopilot?

I want two clusters to each be in a different region so I have basic region redundancy. Some of the services I want to run are stateful (which includes keeping track of user sessions). I am not ...
ift-436t's user avatar
0 votes
0 answers
28 views

Possible to deploy service to GKE Autopilot cluster without YAML?

Is it possible to deploy to GKE Autopilot cluster without YAML and just command line? I have inherited a project where deployment generates command line to deploy to CloudRun. I am in the process of ...
ift-436t's user avatar
1 vote
2 answers
322 views

Access to Kubernetes service non-HA or HA cluster

My setup has previously been one control node (non-HA) and a few worker nodes on Kubernetes. New I'm building up a new cluster with three control nodes (HA) and 9 worker nodes. Connection from browser ...
ajlind's user avatar
  • 111
3 votes
2 answers
111 views

Have a single running process in a 4 node Windows Server cluster

Is there a way to have a single running process in a 4 node setup on Windows Server? And if the node running the process goes off, to automatically start it on one of the remaining 3 nodes? Currently ...
cmicma cmicma's user avatar
0 votes
0 answers
60 views

Kubernetes Load Balancing with Redis Cluster and microservices

I have the following scenario: N kubernetes Nodes A redis cluster with N instances, each node has a single instance There are requests coming into the nodes in a round-robin format After the requests, ...
me_the_bo's user avatar
1 vote
1 answer
494 views

Slurm nodes randomly dropping

I've set up a cluster using Slurm, consisting of a head node, 16 compute nodes, and an NAS with NFS-4 network shared storage. I've recently installed Slurm on Ubuntu v22 via apt (sinfo -V reveals ...
mkasemer's user avatar
4 votes
1 answer
494 views

Failover Cluster Disk Replication

We have a Windows failover cluster containing a shared disk assigned to a Role and want to set up replication from it. We tried removing the disk from the cluster to use DFS Replication, however we ...
bShaver's user avatar
  • 43
0 votes
0 answers
109 views

IIS Cluster with ARR+NLB - Multiple Ports

I have two servers with NLB and ARR. And I have two IIS servers behind ARR. For now, as I tested, it only routes 80 and 443 ports. Can I route all ports (or may be defined ones) from ARR to IIS ...
LevanM's user avatar
  • 1
2 votes
1 answer
403 views

MaxScale doesn't connect to Galera Cluster

I am working on a distributed HA cloud system and I have a Galera Cluster with 3 separated servers in Docker Swarm. It works as expected. I have 3 separated services for the Galera members due to ...
milanbalazs's user avatar
1 vote
0 answers
285 views

MariaDB Galera cluster with failed node

A client of mine asked a question that I'm not really sure how to answer correctly. His question is: In case of one node falls out of the cluster, stays offline for a few hours or days and then comes ...
Bert's user avatar
  • 1,094
1 vote
0 answers
425 views

Availability of CHROOT in Docker containers and clusters

Is the Linux tool chroot generally usable in a Docker container running in clusters and cloud platforms? (background) I'm developing an application where I may need to use chroot inside a Docker ...
Matteo T.'s user avatar
  • 111
5 votes
2 answers
716 views

Corosync/Pacemaker/DRBD Resilience Tuning

I have a DRBD cluster and one node was switched off for a couple of days. The single node ran fine without a hiccup. When i switch it on I got into a situation where all resources got stopped and one ...
Waslap's user avatar
  • 173
3 votes
1 answer
244 views

Howto: Block or File replication across 3+ nodes without a SAN

The setup I admin the backend for a website that currently exists on a single node using Nginx (webserver), Neo4J (database) and Wildfly (app server). The website is getting enough traffic that we ...
SiegeX's user avatar
  • 587
1 vote
1 answer
456 views

Failover Cluster Manager - Location of the stored clusters

I have about a dozen clusters that i monitor daily. I use the Failover Cluster Manager under MMC for a dashboard view of the clusters. Two things i am looking for. Where are the cluster names that ...
pithhelmet's user avatar
1 vote
1 answer
104 views

Running a cluster 24x7 at full load. Possible damages? [closed]

Let us assume that we have a pool of some 50 computers with 6 cores and 12 threads each. If someone plans to use it for intensive astrophysics simulation using all of its logical CPUs (50*12) for 24x7,...
Peedaruos's user avatar
3 votes
2 answers
109 views

There is no replication in a HA Cluster

I had the problem of unrelated data aborting in a HA cluster and my Mysql resource was in standalone on both nodes, I managed to solve the problem and both nodes are synchronized, the problem now is ...
Iván Jf's user avatar
  • 121
1 vote
0 answers
101 views

MySql Service Not Starting in cluster with DRBD

I have a high availability cluster with two nodes configured, after a maintenance carried out by an external company when restarting the system my mysql resource stopped working. when executing the ...
Iván Jf's user avatar
  • 121
1 vote
1 answer
122 views

mysql NDB backup fail

I'm trying to abort a backup on a NDB cluster like this: ndb_mgm> abort backup 2304081512 Abort of backup 2304081512 ordered But there is no change, the backup seems to be stalled : ndb_mgm> ...
Julien's user avatar
  • 164
0 votes
0 answers
251 views

SLURM / NFS based computing cluster with disk uniterruptible sleep issues (state : D)

Context : We have a computing cluster based on 7 servers, running Debian 11: a storage (HDD NAS, ~500TB, RAID5, LVM) a frontal server, running SLURM, nfs-common 5 nodes on which the storage is ...
Grégory Hare's user avatar
3 votes
1 answer
2k views

How to parse and filter on dict values on Ansible?

I'm currently working on a playbook to create a K8s cluster on Nutanix Prism Central. Everything run smoothly but i face an issue while a VLAN exists on one or more clusters. In my case, a VLAN is ...
motorbass's user avatar
  • 373
0 votes
1 answer
381 views

Windows Server quorum concept and split-brain issue prevention

I saw a similar question asked here that is closely related, but the provided answer doesn't entirely address my doubts. Assume a 3 node cluster is configured without a witness node, and all nodes are ...
user5539357's user avatar
1 vote
0 answers
472 views

Can not start etcd cluster when setting up a HA K8S cluster

I am following this article to set up a HA k8s cluster: Guide: Kubernetes Multi-Master HA Cluster with kubeadm I have three master nodes(3,4,5) and four worker nodes(2,6,7,8) (one of the worker nodes ...
Erika's user avatar
  • 111
0 votes
1 answer
245 views

Setting up slurm with 2 different nodes and 2 different partation on 1 physical server

I have a requirement for setting up slurm on one physical server, with 2 different partation and 2 main node so, need to have, partation1 wihich need to have node1 and need to be used by group1 user ...
biplab 's user avatar
0 votes
1 answer
364 views

ceph-deploy install command fails with [ceph_deploy][ERROR ] RuntimeError: configparser.NoSectionError: No section: 'main'

Command ceph-deploy install admin datanode_dn2 fails with output: [ceph_deploy.install][INFO ] Distro info: rocky 9.1 blue onyx [admin][INFO ] installing Ceph on admin [admin][INFO ] Running ...
Kabira  K's user avatar
  • 133
0 votes
1 answer
177 views

Zabbix DB connection support DNS SRV Records

I have Zabbix Mysql 3 node Innodb cluster, which gives 3 DNS SRV Records with Mysql Router endpoints. I need to configure Zabbix server and web DB connection as DB host (e.g _mysql._tcp.example.com), ...
Ritz's user avatar
  • 1
0 votes
1 answer
867 views

"CrashLoopBackOff" while deploying mysql on multi-node cluster

This is my configmap.yaml file: apiVersion: v1 kind: ConfigMap metadata: name: mysql labels: app: mysql app.kubernetes.io/name: mysql data: primary.cnf: | # Apply this config only ...
best_of_man's user avatar
-3 votes
1 answer
72 views

Can Auto-Scaling be considered an advanced concept of Clustering?

Since using auto-scaling, it seemed to be no different from clustering except that the scale is automatically changed. I think what they have in common is that both increase availability by ...
john_smith's user avatar
-3 votes
2 answers
144 views

Heterogeneous Cluster Solution for R&D

I work in a research laboratory with multiple physical machines with different specifications. The machines have different CPUs (some Intel, some AMD), different RAM sizes, some have discrete GPUs, ...
pinxau1000's user avatar
0 votes
1 answer
213 views

Linux missing lvm

hello so i have a ubuntu hpc cluster and i got a problem with storage whenever i try to access the storage from my compute nodes i cant i keep getting this error mount:mounting 192.168.100.211:/cm/...
Dhamer Nader's user avatar
0 votes
1 answer
828 views

Can I run a Select query on an SQL dump?

Here is my issue. I've a backup system, that creates an SQL Dump from a DB cluster every day. Works fine, yade yade. The cluster died one day and we realized, the sql dump were wrong for the past 1 ...
Bert's user avatar
  • 1,094
1 vote
0 answers
713 views

How to set HA LVM in RHEL 9 / Rocky Linux 9

I try to set HA LVM (active/passive) in Rocky Linux 9 for my cluster that have 2 nodes (node1 and node2). I'm using iSCSI shared storage to set HA LVM in this cluster. I set HA LVM with following ...
M. Fachrizal Utama's user avatar
3 votes
1 answer
3k views

ssh directly into a specific node on a cluster, without first ssh into login node?

I usually log on to a cluster, start a slurm interactive job, then I am able to ssh into specific running nodes. My questions is, is it generally possible to ssh into a specific node from my local ...
georg's user avatar
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