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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Cluster Storage Pools - disable Auto-Pooling

We have a Hyper-Converged Cluster and we utilise a Storage Pool to create Disks/Volumes within, this is all great and works nicely, however, we have a scenario whereby we want to create a separate SSD ...
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Hyper-v 2012R2 host looses connection to cluster storage

We have a concerning issue with one of our 4 Hyper-V 2012R2 hosts. It looses connection to the clustered storage now and then and any VMs on that host naturally stops when this happens. After a ...
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Pacemaker Virtual IP suddenly Failed

I am new in cluster. We are running SAP Application in HA Cluster (have 2 nodes in cluster) using pacemaker. Node1 if it runs as a master always restart for a few times. After we check pacemaker logs, ...
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Stopping DRBD so I can run some tests with a VM

We have two servers I inherited, both running DRBD and each then running KVM virtual machines. I would love to stop a VM running on server1, and bring up just the 1 VM on server2 for some tests. ...
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Single SSH login for multilpe machines?

I have a number of physical (desktop) machines running at the office as part of a new network to handle processing & serving Open Source data; some of these machines also house VMs. At the moment, ...
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Pod running kubectl trying to reach external cluster

I am using a pod (image bitnami/kubectl) in a kubernetes cluster (clusterA) but kubeconfig is set to point to another cluster (clusterB). Using on premises kubernetes 1.21.7 (on VMs) installed via ...
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How to cluster Redis service

Imagine 6 servers running Redis on all of them: 192.168.10.1 192.168.10.2 192.168.10.3 192.168.10.4 192.168.10.5 192.168.10.6 They have divided into 2 site: Site 1 192.168.10.1 192.168.10.2 192.168....
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Can we assign the multiple cores of different hypervisors in same cluster?

I have configured the Three hypervisors with the OnApp. As all the Hypervisors use the SAN storage, if any hypervisor gets down, VPS hosted on the one hypervisors boots on two hypervisors. Each ...
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IBM LSF Suite for Enterprise 10.2.0.12 LIM Segmentation Fault

I upgraded from IBM LSF Suite for Enterprise 10.2.0.10 to version 10.2.0.12,and now, on only one of our GPU cluster servers (1 out of 8), I can't get the LIM service to stay running. It keeps crashing ...
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Node unable to leave cluster for eJabberd upgrade

Environment ejabberd version: 20.04 Erlang version: Erlang (SMP,ASYNC_THREADS)(BEAM) emulator version 9.2 OS: Linux (Debian) Installed from: source Errors from crash.log 2022-02-08 22:42:45 =CRASH ...
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my emr cluster is being terminated with error after the status is being set to starting

Hi when I create EMR cluster. The status says it is being created but after 58 minutes it throws in error saying Master - 1: Error provisioning instances. Error message(Screenshot of error attached) I ...
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I need to replace servers in windows 2016 cluster. Can I add the 2019 servers to the cluster and remove the old ones?

As the subject says, I need to replace servers in a Windows 2016 cluster that uses an iSCSI SAN as shared storage. Can I just add the new servers to the cluster, after installing the iSCSI drivers, ...
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3 answers
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File Server Cluster with shared storage - options for storage

We would like to build two-node File Server Cluster with Shared Storage on VM. The issues is that our vmware set up doesn't support disk sharing. File server cluster must be available all the time of ...
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Accessing Kubernetes services in the cluster from outside of the local network - Bare Metal

I'm running a simple bare-metal multi-master "high availability" enviroment with 2 masters and 2 workers, as well as another VM with HAProxy serving as external Load Balancer. My question is:...
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Proxmox on Ceph performance & stability issues / Configuration doubts

We have just installed a cluster of 6 Proxmox servers, using 3 nodes as Ceph storage, and 3 nodes as compute nodes. We are experiencing strange and critical issues with the performances and stability ...
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No Pods reachable or schedulable on kubernetes cluster

I have 2 kubernetes clusters in the IBM cloud, one has 2 Nodes, the other one 4. The one that has 4 Nodes is working properly but at the other one I had to temporarily remove the worker nodes due to ...
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Remove sticky session setup with clustered database - sync delay duplication?

I am currently trying to remove my server setup with "Sticky Sessions" and go over to a setup with a Database for the session storage. Instead of one database (single point of failure) we ...
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Can't install rgdal R package on computing cluster - Linux

I am trying to install the R rgdal package on the HPC at my university. I input the usual command used for any other packages, which were correctly installed, but not for "rgdal". install....
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Pacemaker Virtual IP is still pinging

I am having two node pacemaker cluster, with one virtual IP which is 192.168.3.100. The virtual ip is the part of cluster resource, when I stop the cluster using pcs cluster stop --all. I am still ...
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Getting DRBD to boot up in a synchronized state from cold boot

I am working in an environment with an embedded High-Availability NVMeoF cluster, and need this cluster to be available within minutes of a cold power-on of all nodes, and trying to set up a RAID-10 ...
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Ubuntu HA cluster advisory resource placement for service that preferably runs on remote node but can failover to local

I am setting up a ubuntu linux HA cluster. I referred to (https://ubuntu.com/server/docs/ubuntu-ha-introduction). I am also reading through the clusterlabs documentation at https://clusterlabs.org/...
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Hyper-v issue Event ID4625. Hype-v Cluster

I have an issue with event id 4625. Hope you can help me to fix it. I have a Hyper V Cluster whit 6 hosts(2016). On several of my hosts every day I am found alert "Security-Event ID: 4625". ...
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Unschedulable GKE Pods with gvsior

I created a GKE cluster that makes use of gvisor using Terraform: resource "google_container_node_pool" "main_preemptible_nodes" { name = "gke-${var.cluster_name}-preempt-...
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k3s pods not deployed on correct node

I have a k3s cluster with several nodes, let's say 3 nodes. On each node, I have several pods to deploy. It's a "static deployment", meaning that I want to deploy each pod on a specific node....
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Can't SSH from host to VM through static IP

I'm setting a cluster of servers with ubuntu 16.4 VM's to learn about it. As suggested by some tutorials, I set a static ip for each machine besides DHCP one (2 network interfaces). To achieve that I ...
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Is a blade server a cluster system or a multiprocessor system? [closed]

I'm reading the book "Operating Systems Concepts" by Silbershatz et al. and I'm a bit confused about blade servers, in section 1.3.2, blade servers are classified under "multiprocessor ...
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Can I host ONE VM from two servers? [closed]

looked around for a bit and I could not find a definitive answer. My setup is for educational purposes as I am in a CCNA/Cybersecurity program thru my college. Anywho lets get down to it~ PC A is ...
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Is there a way of killing user processes on machines they have no jobs on SLURM?

I'm starting to configure a small cluster using SLURM. One thing I've noticed is that users can still have running jobs on any machine if he follows these steps: Get a machine with salloc SSH into ...
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mountd state directory in HA setup using cluster filesystem

I am running a Spectrum Scale filesystem on RHEL8 that is exported via NFSv3. The HA part is done by ctdb using 4 nodes (active-active), following this configuration guide by the samba/ctdb people: ...
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Why a non-root installation can work across the whole cluster?

I recently installed anaconda (which includes a new python3) locally in my account folder on a cluster with a dozen of nodes (each node with several cores). I use it to install some package P that is ...
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Injected vault-agent pod failing to start, api server & vault aren't communicating

I have a local kubernetes cluster using kind. It is a single node cluster. On this cluster I am following this guide to setup Vault & the vault-agent-injector. If I follow the tutorial step by ...
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Attribute a static public ip for a pod in kubernetes and specify in service

As per Link , we can create pods with multiples networks , if the application opens port with non-default network (eth2,3 etc) How can we expose it as service? In service yaml i do not find any way to ...
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BeegFS cluster - One node dead, need to move on without it

As the title suggests, a cluster consisting of four machines has one dead machine in the rack. The cluster is set up with a buddy mirror system for redundancy, so the data should still be intact. The ...
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ETCD Cluster configuration for Kubernetes: Which one should be considered?

I would like to know how to deploy a ETCD cluster for Kubernetes. It seems like there are two different documentation and I don't know which one must be considered or the impact of each of them. From ...
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Is that possible to assign a virtual IP to the K8s cluster

I have HAproxy in front of my K8s cluster. Here is my HAProxy configuration about the front-end and back-end sections to load-balancing traffic to the pod in the K8s infrastructure. frontend ...
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CLIUSR certificate expiration

I have an Exchange 2019 DAG and the CLIUSR certificate (clusinfracert) will expire soon. I have extensively researched this and there are very few resources online that address this certificate. ...
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2 votes
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620 views

Glusterfs on Synology NAS?

I run a machine-learning cluster for my small business. The cluster consists of three Ubuntu servers. The 10TB /home directory, provided by Server 1, is shared across all servers and is almost full. I'...
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Apache clustering for windows

I want to setup Active-Passive apache web server cluster. Basically if one server goes down second becomes primary and vice versa. I have seen articles/videos for linux environment(like here) but ...
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AKS multi-cluster peering not working for Kubernetes services

We have 2 AKS clusters (not private) deployed in West Europe and East US, without availability zones, Azure CNI networking, Azure network policy (not calico), and everything is provisioned with ...
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How to configure Mongo Atlas cluster to be accessible only from AWS ECS?

I have a NodeJS application which runs as a container on AWS ECS inside its VPC. For the database I have a cluster on Mongo Atlas. How can I configure Mongo Atlas so that the database is only ...
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Backend multiples apache 2.4 sync settings virtualhost

I have a set of apache 2.4 backend (Ubuntu server) with the same virtualhost and same configurations (the content is accessible through an HTTPS balancer) how could I easily replicate this ...
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Jboss 7 edit manually domain.xml - bad practice

I know that i mustn't edit domain.xml manually, it's a real bad practice. I must modify JBoss cluster with cli or web console. But, under same circustances i only can do this action to solve a problem....
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Changing the subnet on which my beegfs cluster operates

I've added some fiber channels between the machines that constitutes my BeegFS cluster in an effort to increase throughput. However, I have to leave the old coppy ethernet in place with its addressing ...
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Failed configuring active-active shared disk with drbd and pacemaker

I followed Clusters from Scratch instructions, chapters 8 and 9, to configure an active-active, shared disk cluster with drbd and pacemaker. The difference with that tutorial is that I am using OCFS2 ...
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2 votes
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I'm looking for a way to configure distance clustering of postfix and dovecot

I currently have a postfix server and dovecot server sharing files from an NFS server in the UK and the same config in Switzerland. I tried to mailsync but that appeared to lose emails, so then I ...
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2 votes
2 answers
1k views

kubernetes mariadb-galera cluster - bitnami helm chart - Readiness probe failed

I am trying to setup a mariadb-galera cluster through the bitnami helm chart in my kubernetes cluster (1 master, 3 nodes). I have modified the myvalues.yaml to include an existingClaim: dbstorage and ...
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2 votes
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drbd - diskless node won't join cluster unless started first

Good day, I am trying to set up a 3-node DRBD9 cluster 2 nodes actually have a disk the 2 nodes with disk have a direct link via a cross cable and a switch connection with third node third node is ...
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pcs creating cluster fails because of unknown hosts

I am following several tutorials now and all of them have such steps -- authenticate given hosts in pcs and then create cluster. Yet in my case the first step (authenticating) works while the second ...
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1 vote
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Deploying two applications on the same instance with clustering

I am trying to deploy two applications listening on different ports on the same instance (a Next.js application along with a Node.js API server). I will use a reverse proxy to route traffic to them ...
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3 votes
1 answer
880 views

Zero downtime with Kubernetes on top of GlusterFs on top of a ZFS raid - Is this the best solution?

TL;DR A client requests me to make a robust system to run containerized microservices within their LAN. Restriction: They give me 2 machines and 6 data-disks. No more hardware. I have to build "...
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