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.
1,369
questions
2
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1
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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 ...
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0
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0
answers
49
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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.
...
0
votes
1
answer
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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
...
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2
votes
1
answer
60
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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 ...
- 5,775
2
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1
answer
259
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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. ...
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2
votes
3
answers
93
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 ...
CommunityBot
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0
answers
72
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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 ...
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0
answers
24
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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....
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1
vote
1
answer
8k
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Windows cluster has lost or discarded the CLUSDB
Both nodes of a two node windows failover cluster on 2008R2 have lost the CLUSDB file.
I think this happened because an inexperienced admin came to a cluster with a reserved disk issue and re-...
CommunityBot
- 1
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votes
0
answers
41
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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 ...
google-cloud-platform
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0
answers
23
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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 ...
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1
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2
answers
269
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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 ...
- 3,561
1
vote
2
answers
5k
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Utilizing A Secondary IP On A NIC In A Windows Cluster
RELEVANT INFORMATION
I have a windows cluster with 3 nodes in it...
Node1
Node2
Node3
I have 4 NICs on each node...
NIC1_Host
NIC2_Virtuals
NIC3_Cluster_HB
NIC4_Live_Migration
This is the config ...
CommunityBot
- 1
4
votes
1
answer
6k
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clvmd problems during the RHEV cluster deployment
We are deploying Red Hat Enterprise Virtualization cluster and we faced a problem attempting to start clvmd service after the lvm partition creating. The following has been completed successfully:
...
CommunityBot
- 1
0
votes
1
answer
5k
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"Authentication key already exists" error while adding computer to cluster proxmox
I had 2 computers running proxmox which were set up in a cluster called "cluster1". For simplicity the computers were named computer1 and computer2. computer1 was the primary, and computer2 was added ...
CommunityBot
- 1
1
vote
1
answer
383
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 ...
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3
votes
2
answers
83
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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 ...
- 5,775
0
votes
0
answers
53
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, ...
4
votes
1
answer
322
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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 ...
- 5,775
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0
answers
87
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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 ...
- 1
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votes
8
answers
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How to make AD highly available for applications that use it as an LDAP service
Our situation
We currently have many web applications that use LDAP for authentication. For this, we point the web application to one of our AD domain controllers using the LDAPS port (636).
When we ...
- 2,594
5
votes
2
answers
6k
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How to set up Zabbix to monitor SQL Server Failover Active-Passive Cluster?
It should be simple, so it is just most likely my approach being totally off and someone will hopefully prod me into the right direction.
We have a Zabbix 2.0.3 server instance set up monitoring a ...
CommunityBot
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2
votes
1
answer
306
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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 ...
- 131
1
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2
answers
582
views
SQL 2005 Cluster - How to move MSDTC
We currently have a 2 node (Win2003) SQL 2005 Cluster running 2 instances.
We need to move all drives to a new SAN but are pondering over how to move the DTC that is currently 'logging' te Quorum ...
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21
votes
4
answers
37k
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Are ZFS clustered filesystems possible?
Is it possible to create a ZFS cluster? Or would you need to go the seemingly ugly (to me at least) route of ZFS with UFS formatted pools governed by GlusterFS?
The idea is to see if it is possible ...
- 198k
1
vote
0
answers
249
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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 ...
1
vote
0
answers
265
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 ...
- 111
1
vote
2
answers
5k
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When creating a Win2012 cluster "The network name is already used on the network" no matter what name is used
I have a test setup that has 2 Windows Server 2012 VMs on Hyper-V joined to a windows 2008 R2 domain - there is an internal network whose DNS server is on the domain controller and an external network ...
- 133
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votes
2
answers
533
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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 ...
- 33.3k
5
votes
7
answers
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What's the best way in Windows to manage multiple ssh sessions (via putty?) to look at clustered servers?
There's a tool called cssh for linux that has simular use to what I'd like to have on Windows. Basically I'm logging into servers that are identical to each other and I'd like to be able to type the ...
- 101
1
vote
1
answer
104
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> ...
- 144
3
votes
3
answers
609
views
How to create shared folder with Linux Samba Cluster that is accessible by Windows? (Two PCs in cluster with one IP)
does anyone know how to create a shared folder in any distribution of Linux that could be accessible by Windows and would be HA (high available)?
Background:
I have Windows Server cluster and it needs ...
- 1,300
3
votes
1
answer
214
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 ...
- 567
4
votes
5
answers
6k
views
Ubuntu Clustered KVM's
I'd like to set up three virtualized server on one box running Ubuntu KVM. I'd also like to have a second machine mirroring the above mentioned on a cluster so that if the first machine physically ...
- 214
1
vote
1
answer
296
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 ...
- 11
3
votes
2
answers
104
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 ...
- 14.1k
3
votes
1
answer
2k
views
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 ...
- 203
0
votes
0
answers
113
views
Kubernetes tomcat cluster: skipping state transfer. No members active in cluster group
k8s StatefulSet:
apiVersion: v1
kind: Service
metadata:
name: my-web
labels:
app: my-web
spec:
ports:
- name: http
port: 8080
targetPort: 8080
selector:
app: my-web
...
- 109
0
votes
0
answers
165
views
Tomcat cluster in Kubernetes: fetchMembers Failed to open stream
Tomcat cluster in K8s:
Following https://cwiki.apache.org/confluence/display/tomcat/ClusteringCloud
added the following in tomcat server.xml:
<Cluster className="org.apache.catalina.ha.tcp....
- 109
1
vote
1
answer
104
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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,...
- 102k
0
votes
1
answer
188
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/...
- 510
16
votes
8
answers
2k
views
When is the right time to introduce high availability for web site?
When is the right time to introduce high availability for web site?
There are many articles on High Availability options.
It’s not that obvious however WHEN is the right time to switch from single ...
7
votes
1
answer
2k
views
Miserable performance of Hyper-V storage on CSV
I recently setup a new environment consisting of:
- QSAN Storage with 10Gib network
- Mellanox switches 10Gib
- 4 x Physical nodes connect to LAN and SAN 10Gib
The physical hosts are connected ...
- 1
0
votes
1
answer
1k
views
kube-apiserver logs that certificate has expired but it's not
kube-apiserver pod print following log:
authentication.go:104] Unable to authenticate the request due to an error: x509: certificate has expired or is not yet valid
I already renewed all certs
renew ...
- 1
0
votes
0
answers
12
views
error while downloading the file fron the cluster
protocol error: unexpected
my ~/.bashrc code is as:
# .bashrc
# Source global definitions
if [ -f /etc/bashrc ]; then
. /etc/bashrc
fi
# User specific aliases and functions
source /home/...
- 25k
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votes
0
answers
100
views
fix crm cluster in sles12sp5 for 12 node master slave configuration
When we try to add the additional servers 0f 6 004,005,006,104,105 & 106.to the existing server of primary 001, 002 & 003 Secondary 101,102 & 103.
crm configure show
node 1: pbh001
...
1
vote
0
answers
87
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 ...
- 121
0
votes
0
answers
208
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 ...
2
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 ...
- 1,172
0
votes
1
answer
289
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 ...
- 2,677