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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0 answers
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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,...
3 votes
2 answers
209 views

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 ...
3 votes
1 answer
371 views

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 ...
0 votes
1 answer
183 views

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. ...
1 vote
1 answer
547 views

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 ...
0 votes
1 answer
157 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 ...
4 votes
1 answer
4k views

MariaDB how to handle 2/3 node failure in multi master cluster.

I run 3 node multi master MariaDB galera cluster. It basically works for me how it is. When one node fails, two other work and it's fine. But I'm wondering is there a way for it to keep working on ...
1 vote
2 answers
100 views

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 ...
9 votes
2 answers
179 views

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 ...
1 vote
1 answer
2k views

How to run multiple Heartbeat/Corosync/Pacemaker clusters in the same network? (Quorum)

We intend to run several components to run a web site. Like a load balancer, a cache and a couple of web serserves. To avoid single-points-of-failure we intended to use Heartbeat/Corosync/Pacemaker ...
0 votes
1 answer
2k views

Can't start VM OpenNebula

I have 3 nodes with CephRBD + OpenNebula + Corosync + Pacemaker + Galera + crmsh. Software: OpenNebula 4.14.2, CentOS 7.1 All works, but when I instantiate VM, a get an error and VM in PENDING ...
1 vote
0 answers
4k 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. ...
0 votes
1 answer
2k 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....
0 votes
1 answer
935 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 (...
0 votes
1 answer
1k views

Session replication in Tomcat

I have setup my cluster with one loadbalancer and 2 nodes with sticky session. I am using mod_jk for loadbalancing. I am having problem with proper session replication. I am using Tomcat 6. When I ...
1 vote
1 answer
602 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 ...
3 votes
1 answer
12k views

Windows Failover Cluster - Create Cluster Wizard: error occurred while creating the cluster

I have 2 identical Windows Server 2008 R2 servers which I am trying to setup a failover cluster on. The "Validate a Configuration" passes, but the actual creation process produces an error: An error ...
1 vote
1 answer
1k views

sql server 2008 cluster hang when a heavy load is run

we have a sql server 2008 active/active cluster running on wondows 2008R2 O/S. 14GB RAM, 4xCPU. we have set a ceiling of 12GB for sql server. We're running an agent job which loads 3 million records ...
2 votes
3 answers
1k views

Clustering filesystem for small files

I'm looking for a distributed filesystem which I could use for storing lots of small files (<1MB usually). What I want to get is: 2 servers which have the fs mounted themselves and mirror the data ...
1 vote
0 answers
3k views

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 ...
1 vote
1 answer
2k 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 ...
-1 votes
1 answer
88 views

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 ...
2 votes
1 answer
121 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 ...
1 vote
1 answer
1k 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 ...
1 vote
0 answers
168 views

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 ...
3 votes
2 answers
8k views

Failover Cluster Client Access Point Only Responds to Pings on the Owner Node

Background We're running two VMs (Windows Server 2012 R2) on Azure with SQL Server installed, set up as an availability group. We also, of course, have another VM as a dedicated DC. These are all ...
0 votes
1 answer
1k 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 ...
3 votes
3 answers
2k views

Windows SQL Server Cluster Failover Without Disruption

Is MS SQL server clustering capable of performing a seamless fail over between nodes? That is, where the clients wouldn't notice anything had changed except perhaps a short delay during the ...
0 votes
0 answers
474 views

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 ...
1 vote
3 answers
9k views

Failover pacemaker cluster with two network interfaces?

So, i have two test servers in one vlan. srv1 eth1 10.10.10.11 eth2 10.20.10.11 srv2 eth1 10.10.10.12 eth2 10.20.10.12 Cluster VIP - 10.10.10.100 Corosync config with two interfaces: ...
5 votes
2 answers
14k views

Redis/Sentinel cluster failover results in "failover-abort-not-elected master"

I have a 2 node Redis cluster set-up. [master] 192.168.56.102: Redis Master (:6379), Redis Slave (:6380), Sentinel(:26379), Sentinel#2(:26380) [rescue] 192.168.56.103: Redis Master (:6379), Redis ...
1 vote
0 answers
277 views

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 ...
2 votes
0 answers
2k 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 ...
1 vote
0 answers
769 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 ...
2 votes
1 answer
140 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? ...
1 vote
0 answers
17 views

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 ...
1 vote
1 answer
276 views

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 ...
0 votes
0 answers
2k 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 : ...
1 vote
1 answer
3k views

How to stop/hibernate GKE cluster in GCP?

In order to save costs, we would like to stop or hibernate an Kubernetes GKE cluster in GCP cloud. I could not find any hint on this in documentation. Did I miss something?
2 votes
1 answer
6k views

How to specify two different subnets in NFS exportfs cluster resource on RHEL 7

I'm configuring a NFS export resource on a RHEL 7 cluster, and I need to let a shared directory be mountable from clients belonging to different subnetworks. For example, the following command ...
0 votes
1 answer
265 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 ...
1 vote
0 answers
64 views

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 ...
4 votes
1 answer
2k 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 ...
1 vote
1 answer
141 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 ...
1 vote
1 answer
740 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 ...
2 votes
2 answers
514 views

Percona XtraDB Cluster with GlusterFS

We are deploying a GlusterFS cluster with 4 nodes, and we want to deploy the Percona XtraDB Cluster on top of it with 4 nodes, each node will have a mounted folder from the GlusterFS, each mount will ...
2 votes
1 answer
863 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 ...
4 votes
3 answers
6k views

Entire proxmox Xen Node has grey question marks + database container gone

Firstly, i've recently taken on the management of a proxmox cluster which I have had no experience managing previously (i'm completely new to cluster management, but not too bad at linux). pve-...
0 votes
1 answer
3k views

Gcloud create node-pool hangs forever in auto-repair with no nodes

Adding a new node-pool to an existing cluster is failing with no nodes registering. The command used to add the node-pool is as follows (project name changed): gcloud container --project my-project ...
2 votes
0 answers
70 views

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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