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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15 views

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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How to gracefully handle Windows Updates on a cluster of Windows Servers running Windows Services?

I have several Windows 2016 servers that each run a mission critical Java Web Service installed as a Windows Service. They act together as a cluster of web servers. The problem is, when Windows ...
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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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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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Good architecture for redis cluster in HA scenario with low writes and high reads?

I was going through different clustering docs of redis available online and came across two types of clustering. 3 nodes running on 6 machines, with slots divided between nodes, each node has one ...
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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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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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Kubernetes lab cluster setup

Done a lot of googling and reading, as well as viewing as a guest from Google searches on this topic as my goal is to setup a small kube lab cluster from scratch myself. Decided to sign up today and ...
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Do I need 1 RDS Cluster for each DB or a single RDS Cluster for all my DBs?

Let's suppose I have 5 databases I'm going to use in my application. The application will be used by +100k users. I'm planning to use RDS Cluster with Aurora PostgreSQL. What would be best? Create 1 ...
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mongodb, remove one of the replica set's from a sharded cluster

I need to remove filed server01 (currently offline for a long time). The configuration looks like this: shards: { "_id" : "mongo1", "host" : "mongo1/server01:27017,...
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Cluster Tomcat network isolation

I'm playing with a Tomcat cluster of 2 nodes (A and B). I have configured the 2 Tomcat server to replicate their sessions with a org.apache.catalina.ha.session.DeltaManager and all is working fine, ...
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Windows Disk Cluster for Hyper-V Failover Cluster

Looking for design assistance. Typically, I use a 2 node SAN disk cluster running CentOS and DRBD for high availability. I will then connect the hypervisor(s) via iSCSI; sometimes KVM/QEMU, sometimes ...
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Corosync-Pacemaker no split brain

I'm trying to set up a cluster of two nodes using CentOS 7, Corosync, Pacemaker and pcsd. I can migrate resources manually from one node to another, but if I turn off primary node (by unplugging the ...
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HPC cluster master node as virtual machine

For a given small HPC cluster (~16 nodes) a master node is used as a front-end for users to login and interact with SLURM, and not as a computing node. The master node is currently a bare-metal server....
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Nodejs Cluster with pm2 mix

Is it a good idea to mix nodejs cluster module with pm2 ? E.g. we run the cluster.js file with pm2 like pm2 start cluster.js -i max
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Permission issues in GCP Container Registry

We need some help. We don't see any docker registry in GCP. It says that it has permission issues but we have enough permissions to do everything in there. Also we cannot connect any cluster in GKE. ...
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Nomad nodes remove each other services from Consul

I got two nodes Nomad cluster along with a Consul instance so that the jobs can register services to connect to. However, the services keep getting synced and deregistered. Here is what I have from ...
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107 views

Kubernetes + AWS Lambda [closed]

I currently have an API service running on AWS Lambda, but it's getting expensive due to high AWS costs. My aim is to replace 95 % of the usage with a cluster of servers and still handle peaks with ...
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Basic knowledge about server cluster

I work in a small office with, maybe, 15 workstations and a server that I've recently deployed running Ubuntu Server 20.04. I discovered some redundunt servers that makes me think about creating a ...
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Kubernetes - How to expose on premise multizone cluster?

I've configured a kubernetes two zone cluster with the following topology: +--------------------------------------------------------------------------+ | WAN ...
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237 views

pcs running but status shows resources stopped

My first time setting up pcs. I have two CentOS 7 VM's on which I installed pcs and Pacemaker. I defined a virtual IP and Apache HTTP cluster. The two VM's have IP's 192.168.56.121 and 192.168.56.122. ...
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142 views

Spark-Cassandra-Connector Issue Exception in thread “main” java.lang.NoClassDefFoundError: com/datastax/spark/connector/rdd/reader/RowReaderFactory

What is going wrong with the Spark Cassandra Connector could you please help to solve this? Scala File: import com.datastax.spark.connector._ import org.apache.spark.sql.SparkSession import org.apache....
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Best options for storing and sharing data over mutiple servers, to be accessed by multiple users

In the environment I currently work in there are several servers dedicated to various departments. However we recently got our hands on several identical servers potentially, around 10+. I'm hoping ...
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189 views

Attribute a static public ip for a pod in kubernetes

In my data center, I implemented a Kubernetes infrastructure with 3 workers and one master node. I'm looking to build 5 pods running postfix mail server, but because of risking to be blacklisted, I'm ...
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293 views

WSFC DNN Listener Resolving to secondary in Availability Group

I have an Azure AO AG which consists of three servers (all WS-2019 & SQL-2019CU3): A - Subnet 1 - Principal Server (Sync) B - Subnet 1 - Secondary Server (Sync) C - Subnet 2 - Secondary Server (...
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Can't Live Migrate or move Hyper-V VM

we have a two-node Server 2019 Hyper-V cluster with an SSD SAN providing the shared storage. I'm in the process of trying to update the host servers with their windows updates. I planned to move all ...
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348 views

Is it possible to deploy Datadog agents on AWS EKS cluster using terraform

I am looking to understand if anyone can guide me on how to install Datadog agents on my AWS EKS cluster as pods. I am able to complete my requirement by using kubectl commands. But here I am looking ...
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Save as on file server grayed out

When I try to save a file on my Windows fileserver (a failover cluster with 2 nodes), the window is locked and it's not possible to navigate through the folders, and it's not possible to save files in ...
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1answer
92 views

Hyper-V Cluster 2019 suggestion for requirements [closed]

We are planning to purchase nodes for the Hyper-V Cluster which will run on Windows Server 2019. Which chipset you recommend for cluster 2019? What is your recommendation for PCIe Cards? Should all ...
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266 views

How Can I Remove a MariaDB Galera Cluster

I have made MariaDB-Galera replication with 3 ubuntu servers, but somethimes I need to delete the created cluster, so I can create a new Galera replication cluster. How can I do that? Or how can I ...
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Mounting virtual GPUs on different machines

I have multiple computers connected over a VPN, each computer having one or more Nvidia GPUs. All computers run Linux. I'm wondering if it's possible to mount them over network such that they appear ...
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171 views

windows cluster - Service Principle Name but no cluster service?

I used to be detecting which servers in our big environment are clusters or cluster nodes by checking ServicePrincipalName value of their AD objects if it is a string containing MSServerClusterMgmtAPI ...
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Query to get the failoverCount and lastFailover in a Windows Failover Cluster

Anyone know of a command or PowerShell script to get the current failoverCount and lastFailover datetime in a Windows Failover Cluster? I have a 2-node cluster that doesn't automatically failover ...
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xFailOverCluster DSC push from one domain to another results in WinRM error

Our tfs/build server also acts as our DSC push server. It is in domain "a" and is pushing onto servers in domain "b". Both on different clouds. When running the compiled .mof it instantly fails with: ...
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ActiveMQ Artemis: Use Plain TCP and TLS in parallel

In ActiveMQ Artemis, when acceptors and connectors are both configured, we see clients connecting to the TCP as well as the TLS port. How can we control that a client stays on its initial connection ...
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584 views

ActiveMQ Artemis: Clients connect to the broker cluster port

We are connecting with some JMS clients to ActiveMQ Artemis (v2.14.0) brokers running in a cluster configuration. Today, we have noticed that the clients connect to the acceptor that is dedicated to ...
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1answer
129 views

VMware - cluster resources utilization

I have 2 hosts in a cluster (running vSphere Client version 6.7). how can i be sure that when i want to enter one of them into maintenance mode, the other one would be able to hold all VM's resources? ...
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Redis Cluster modification

I have currently 2 Virtual Private Servers with 3-3 Redis instances. What I want os, to spread them to 3 VPSs with 2-2-2 nodes each. How do I do that in a way, I can keep all my keys? I also want to ...
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217 views

Slurmd remains inactive/failed on start

I currently have a cluster of 10 worker nodes managed by Slurm with 1 master node. I have previously successfully set up the cluster, after some teething problems, but managed to get it working. I put ...
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81 views

NginX and Galera Cluster are friends?

So I've found NginX's official tutorial, how to use NginX Plus as the proxy for the MariaDB Cluster. However, if I do this with my standard NginX (not the Plus edition) I constantly get the error ...
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Two Servers in One cluster, Public IPs, and many private subnets. Floating IP with HA?

We are working on a Debian based linux firewall setup, where we are planning to deploy 2 Physical Servers, Node A and Node B. They both would have Public IP address and 1 floating IP. The question ...
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907 views

Cannot connect to the Docker daemon at unix:///var/run/docker.sock

I'm following the Certified Kubernetes Application Developer (CKAD) Certification, and in their manual they are providing a bash file to deploy a master node using Kubeadm, and this is it's content : ...
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356 views

Tasks Scheduler Windows High Availability

What is the best way to put in place «tasks scheduler» with high availability under Windows? Currently, the tasks are planned on a single server, which is a problem when the server reboot (for many ...
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1answer
47 views

Can my Ceph nodes have the same hostname?

I have a high availability solution which requires me to have all my nodes using the same hostname. I've been tasked to use ceph cluster storage, but I just reached a dead end. I can't figure out how ...
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9 views

Why is mysql failing on boot, but not after restarting using galera?

I'm using mysql and I've setup a galera cluster with two machines. I have a problem where after I configured galera using the config bellow, and rebooting the machine, mysql fails to start and because ...
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544 views

Windows Clustered Shared Volume IOPS

Quick question. I'm reviewing the IOPS for my CSV, and im confused about the Cluster CSVFS\Reads/sec counter. I aligned Physical Disk\Disk Reads/sec (for the CSV disk) with Cluster CSV File System\IO ...
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198 views

ActiveMQ Artemis: Message draining without HA policy “scale-down”

In an ActiveMQ Artemis HA cluster (v2.13.0), the HA policy’s <scale-down/> property causes the backup broker to move all pending messages to one of the remaining live instances if the master ...
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1answer
65 views

ActiveMQ Artemis: Quorum-only instance?

For a fully redundant ActiveMQ Artemis cluster, either a set of three broker pairs or network ping is required to avoid split-brain scenerios. In some installations, only two datacenters or ...
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1answer
36 views

PCSD simple Master/Slave will not fail master over

I am trying to write a trivial pacemaker Master/Slave system. I created an agent, it's metadata follows: elm_meta_data() { cat <<EOF <?xml version="1.0"?> <!DOCTYPE ...

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