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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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14 views

How to I redirect read requests to replica in Postgres Cluster?

I have a Postgres Cluster of 2 servers currently. They are managed by Patroni with ETCD as my DCS. I want to be able to redirect Read requests to the replica and Write requests to the master. I read ...
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1answer
41 views

What does “CPU Minutes” mean exactly?

I'm actually trying to report cluster utilization in Slurm but i don't understand the metric CPU Minutes. [root@XXXX]# sreport cluster Utilization Start=2018-12-01 End=2018-12-31 ---------------------...
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1answer
42 views

what disk format I better choose for my windows server 2016 virtual machines for clustering? [closed]

I want to create 3 virtual machines hosted on my computer windows 10. these 3 machines would be : 1) 1 machine to be used as a domain controller 2) 2 machines running windows server 2016 datacentre ...
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1answer
13 views

save hdf5 data when admin kills script

I have a lot of Monte-Carlo data that I need to process at a particular cluster. What I do is, for a given data sample (which is on average of size 70 GB), I run some statistics script in python on ...
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1answer
21 views

2 MySQL instances in the same cib.xml

I have a RHEL 7.3 cluster with 2 nodes, managed by Pacemaker. It's used for MySQL HA. I currently have one MySQL service added to the cluster (MySQL 5.2): <primitive class="ocf" id="mysqldb1" ...
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1answer
22 views

Reboot Remote Shutdown server linux

I remotely manage a hadoop cluster by Cloudera manager. I accidentally shutdown one of the servers and need to reboot it. I have tried ssh but I cannot connect to host. Is there another way for me to ...
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2answers
123 views

AWS - Four load balanced t3.micro vs one t3.medium for a NodeJS API

I'm trying to decide which of the two setups would be get me more price/performance value with the consideration that I will run a NodeJS API in cluster mode: All prices are current rates for ...
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1answer
70 views

View traffic flowing through NAT machine

I have been put in charge of an HPC cluster recently and the last admin didn't do a great job of documenting everything. We got a notification from our IT Security team that our head node has been ...
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0answers
23 views

Rabbitmq cluster1 show info from cluster2

I have two independent rabbitmq clusters (both with v3.6.15), broken down from a older and bigger cluster. AFAIK, the config from the old cluster was exported and re-imported on both clusters and ...
2
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2answers
192 views

CentOS 7: PCS Pacemaker Corosync Active/Active HAProxy dependency

I am trying to setup PCS for HAProxy on CentOS7 in an active/active configuration. I've done active/active before, but I am not familiar with constraints and dependency groups. So far so good: 2 ...
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0answers
32 views

cman cluser nodes cannot read/write files written by each other

I have a cman cluster where nodes cannot read/write files written by each other. Node 1: [user1@server1~]$ ls -l /path_to_sharedvol/ total 4 -rw-r--r-- 1 user1 user1 26 Oct 18 05:38 common-file Node ...
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0answers
97 views

MariaDB Cluster is having timeout issue between nodes

I'm having some hard time diagnosing MariaDB Cluster issue that I would like to have some advices. We're running a 3-nodes MariaDB Cluster, each node is on a dedicated ESXi server, and connected by ...
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5answers
255 views

KVM+DRBD replicated between two active-passive servers with manual switching

I need to build 2-node cluster(-like?) solution in active-passive mode, that is, one server is active while the other is passive (standby) that continuously gets the data replicated from active. KVM-...
4
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1answer
103 views

Hashicorp's Nomad as a HTCondor alternative?

I couldn't find any info on this short of spinning up a Nomad cluster and experimenting so maybe someone here may be able to help. Saying you want to run 100 iterations of a batch java job, each with ...
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0answers
23 views

Recovering VCS 2 node cluster in DR?

We are looking for a solution to recover the 2 node VCS Cluster at DR location for a DR Test. Prod: Hardware is Dell with 24 cores 64 GB RAM with Suse 11.4 Linux over SAN Boot & 4 NIC's of 1 Gig. ...
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1answer
26 views

Kubernetes, partitioning around clusters and namespaces

Let's say we have 2 subsystems: A & B. And we have 2 env: QA & Prod. What would be a better way to organize it around cluster & namespace?. Is it: One cluster for subsystem A, another ...
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0answers
237 views

DLM and CLVMD not starting on pacemaker redhat HA

I was trying to configure an active-active cluster w/ gfs2, I followed the following instructions: pcs property set no-quorum-policy=freeze pcs resource create dlm ocf:pacemaker:controld op monitor ...
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1answer
68 views

An Azure Cluster with Two Node Types

I want to create a Kubernetes cluster on Azure with different node types. The cluster will be used for a web application that performs complex calculations. I want the web application to run on one ...
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1answer
162 views

Configuring Heartbeat to run shell script

I set up a high availability system with Heartbeat, I wish that when there was a drop in the main cluster and the secondary cluster was activated, Heartbeat start in it and execute a shell script. ...
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1answer
15 views

Getting alert “The agent process for node in cell is not running and the node is not in maintenance mode.” in Component Stability tab

I'm trying to setup a clustered WebSphere Traditional 9 with a IBM HTTP Server as load balancer. The nodes and clustered are created successfully, with the node agent started without issue. However ...
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1answer
153 views

How to find what physical server my physical disk in a S2D windows cluster is attached

I have a mirrored S2D cluster setup, one of my drives has an IO error as evidenced below. How do I find what physical server in the cluster this drive is attached to? I've ran all sorts of commands ...
2
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1answer
31 views

Reducing number of static routes in VPN cluster

I'm trying to set up a high availability OpenVPN cluster for worker nodes that have a fixed ip regardless of which OpenVPN server they connect to. This is a requirement, as things are bound ...
2
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0answers
39 views

Move IBM MQ Clustered Queue Managers (RHEL v5 to RHEL v6)

We have 2 production queue managers, running on 7.5 MQ (out of service) that are being moved to a more supported 8.0.0.4 environment ...(same OS - RHEL). We've made the destination servers equivalent ...
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2answers
191 views

Google Cloud Load Balancer- Active/Standby (Active/Passive) decisions possible?

I'm trying to create an active/passive cluster in GCP, and I'm looking at using the native load balancer to achieve this. For example, I want the load balancer to only forward traffic to a particular ...
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2answers
74 views

Site-aware cluster migrates VMs to random nodes, not to the preffered site

We have 2 physical host, 4 virtual-node (HyperV Server VMs, 2 on each host) cluster which is running some nested test VMs (using mentioned HyperV Server). In short it is ment as a lab environment ...
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0answers
33 views

Unable to create additional cluster member in IBM WAS ND 8.5.5

I have server1 on a node, and server2 on another node. I created a cluster (OCHCluster1). If I add server1 to the cluster (irrespective of the clone basis I choose), it adds successfully. If I ...
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0answers
48 views

Fixed route for a network interface with two IP aliases

On a Windows 2016 Server, I need to set a custom route, so that connections to a specific destination ip address always use a specific source ip. But while the route add command allows me to specify ...
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0answers
94 views

EventStore Bad Request (Invalid host) working in cluster

I'm using EventStore with the following configuration : --- RunProjections: All ClusterSize: 2 Db: /opt/eventstore/db DiscoverViaDns: false GossipSeed: 10.0.100.11:1113 GossipOnExt: false Log: /opt/...
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2answers
91 views

Storage solution with a Windows Hyper-V cluster

I'm a bit of a newbie when it comes to storage, so I'd be grateful for any pointers! I'm trying to plan out a small Windows Server 2012R2 Hyper-V cluster for an SMB consisting of 2 servers and since ...
0
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1answer
77 views

glusterfs client mount point fails with 'Client quorum is not met'

Assume a basic replica 3 arbiter 1 configuration, glusterfs-server 4.0.2 and glusterfs-client 4.0.2. glusterfs-client is installed on Ubuntu 18.04. In order to verify that write / read ops are ...
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2answers
569 views

DRBD “Device or resource busy”

Hey guys it's me the noobie intern!! So today i've been asked to configure a cluster on Centos7 using pacemaker and drbd. Everything was going fine until i tried to create a the local meta data for ...
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1answer
3k views

vSphere 6.5 HA agent cannot be correctly installed or configured

Last week we encounter the following issue : we had to shutdown our entire infrastructure due to UPS replacement. At the end of electrical operations we had restarted : network SANs vCenter ESXis (2 ...
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0answers
31 views

How change Galera Cluster port 3306 to avoid conflict between stunnel and SSL

My web app is in another server and I connect to mysql db through stunnel port 3306. Can I change the Galera Cluster regular port from port 3306 to another port? I need this port from web app be ...
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0answers
262 views

Connection reset by peer when running Apache Benchmark

I have setup a docker swarm that has nodes running in it containing node.js apps. Currently when I try to run stress testing with ab tool I get error. Error happens when I try 1000 concurrent requests....
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0answers
358 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-...
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0answers
42 views

(Windows Server 2012 R2) Is it possible to split a failover cluster into 2 new clusters by expanding and splitting the existing cluster?

Say you have an existing application cluster using Windows Failover Clustering - something perhaps like this: Roles: File Share Services RavenDB ClusterDisk Service ServerName (ravendb.mydomain) ...
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2answers
36 views

Equivalent to 'top' command on an EMR cluster?

I have a 3-instance EMR cluster running on AWS, and it's responding very slowly at the moment. When checking the Hadoop dashboard on port 8088 with my browser, I see "Memory used: 203.5GB", and "...
1
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1answer
145 views

Linux Cluster with LDAP, automatically and simultaneously creating homedir on multiple machines

I'm setting up a computer cluster of (20+) machines, I have a working central ldap server for authenticating users and keeping GID and UID synced across the cluster. One machine acts as a head node, ...
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0answers
15 views

Gridengine memory allocation for arrays

I am experiencing some issues using Sun Grid Engine with the flag h_vmem, in particular when using it in combination with job arrays. As far as I know, arrays create a different job for every index, ...
2
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2answers
127 views

Failover SQL cluster to DR site using replication

I am attempting to fail over a SQL cluster with 2 nodes using Zerto replication. I am running Server 2016 Standard and SQL 2017 standard. My network is not stretched, so I need to failover using a ...
0
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1answer
48 views

Cluster using virtual machine software with 2 workstations

I want to do a benchmark between databases (MySQL Cluster, HBase and Cassandra). I need 8 nodes. I have 2 workstations Dual-processor Z600: 1. workstation1: 16 core - 16 Go RAM 2. workstation2: 8 ...
6
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1answer
470 views

2 node cluster (active-passive) with Windows Server 2016

I'd like to create a 2 node cluster with 2 servers with Windows Server 2016 standard. My cluster should be in active-passive configuration without shared storage (SAN, iSCSI, etc.) without active ...
2
votes
1answer
701 views

Corosync HA preventing split-brain scenario

I'm setting up a test system for self-teaching about load balancing and high availability and I'm curious about a configuration setting in Corosync and would like to know what you guys who have ...
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0answers
58 views

How can I make an openfire cluster nodes discover each other?

I'm trying to set an openfire cluster in AWS. I created to EC2 instances which each has a tag of aws-test-cluster=cluster1. I installed Hazelcast plugin. And I put hazelcast-aws-2.1.0.jar into ...
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1answer
210 views

Unable to communicate with node pacemaker during authorization

I'm building a pacemaker practise lab of two nodes, using CentOS 7.1 virtual machines. following instruction from below link, I have installed pacemaker pcs and resource-agents added host to /etc/...
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0answers
169 views

Copy nginx cache between two servers

I have a nginx caching server with at least 2tb of cache files at any moment, i need to migrate this server to another hosting provider but none of my clients can handle that traffic without cache. ...
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1answer
43 views

Weird node number in load balancer setup

I got an odd problem here. I set up Corosync and Pacemaker, I used this guide as a reference but I improvised a little the first time installing it since I'm doing this to learn, not following ...
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0answers
70 views

need to migrate from single drive to raid 1 system

I own a server that only had 1 hard drive installed. I saved up and now purchased 5 large hard drives all are sas drives. My server is supermicro amd and has a built in raid controller. Here's the ...
3
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1answer
60 views

Looking for a Backup Solution: Pure IPv6 Hyper-V Cluster

We're searching for a backup solution that is able to backup Hyper-V clusters in a pure IPv6 environment. Based on my current knowledge, Microsoft's DPM seems to be the only option right now. With ...
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0answers
51 views

how to add machines to MAAS without wiping whole machine

A few days ago our MAAS server got wiped out accidentally and worst is there is no backup. We created a new server and trying to add machines back without deploying again because we don't want to ...