Questions tagged [cluster]

discusion related to cluster mecanism.

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Virtual IP mapping on a physical standalone box

We have a clustered HP-UX server and few mounts are shared among these two servers and move along with fail-over. These two physical servers are redirected by a virtual IP. This virtual IP is used by ...
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1answer
15 views

RHEL 6.9 HA clustering issue with one node completely down

I have two node servers with SAN storage. Each node have RHEL 6.9 with HA and the partition are mapped from the storage using fiber cables with clustered resources. The thing is when the two nodes ...
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galera mysql single node recovery issue

We have 3 node galera cluster and it was functional until last night one of node crashed because of hardware failure and after fixing hardware i am not able to start mariadb and getting following ...
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18 views

How to identify the cause of reboot as the log was not captured in a SLES 12 SP3 (2 node cluster)?

Currently, a failover occured from node 1 to node 2 as there was a sudden reboot on node 1. Upon analyzing the log, it is found that the reboot log was not captured and also kdump was not configured ...
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31 views

Trying to Create an AFM relationship by using GPFS protocol. Having error in cache side cluster

I am trying to create an AFM relationship by using GPFS protocol. Having error in cache side cluster. Steps of Home cluster : 1) Create a home cluster (cluster name - gpfs01). 2) Create a file ...
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36 views

iptables CLUSTERIP and nftables

I'm trying to set up a firewall cluster to do a simple load balance and high avaibility. On iptables I found the CLUSTERIP functionality that would seem to be right for me. If I understand correctly ...
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34 views

MariaDB 10.2.15 SET GLOBAL max_allowed_packet not working

I am running 3 node galera cluster and everything is good but when today i am trying to change max_allowed_packet size without restarting any services it doesn't work. what i am missing? Version: ...
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6 views

open-mpi cluster not working all of sudden (hangs on mpi_bcast)

I just experienced a very weird thing about my cluster! I had built a computer cluster with 2 nodes. Used Ubuntu and openmpi. Created hosts file with node1 and node2 both have 16 slots. My mpi ...
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42 views

pacemaker cluster does not move drbd-fs resource

I have a simple pacemaker cluster on Centos7, with only 1 resource: 2 nodes configured 3 resources configured Online: [ c1 c2 ] Full list of resources: Master/Slave Set: res_drbd-clone [res_drbd] ...
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58 views

OpenLDAP Cluster

Trying to implement an OpenLDAP cluster, I already managed to set up the two backend LDAP servers in mirroring mode. The application (iRedMail) using the LDAP service is running on the same systems ...
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134 views

Stonith resource not working

I am trying to set up a storage cluster with two nodes, both running debian buster. The two nodes called, duke and miles, have a LUN residing on a SAN box as their shared storage device between them. ...
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49 views

kubernetes inodes increasing on cluster nodes but are not evicted even with hard limit

I have a multi-node k8s cluster with pods running that increase the inode usage in the overlay folder over time. There are hard eviction limits set but these never trigger to evict any pod from the ...
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25 views

How does htop calculate times? (Impossible times shown)

I was running what was supposed to be a small make job on a small node in our cluster, but a sorting process seemed to be overwhelming the allocated RAM, so I killed it after 20 hours (same jobs on ...
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44 views

How-to isolate linux process memory into a memory block device?

I have a failover pacemaker cluster with CentOS 8 as VMware VMs, which controls an application resource. This process efectively caches memory over time, so I want to replicate it's cached memory to ...
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1answer
18 views

how to move fs resource in service group in ccs cluster

I have a ccs cluster running on RHEL 6.4 where there is no luci service, i have added a filesystem resource to the cluster with the below command but i need to move the resource inside a service group....
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36 views

How to setup a compute cluster in local network on top of linux

I have 3 machines in my local network running manjaro. I am running python scripts using dask, pandas, etc which max out the cpu on the first machine and I usually need to wait more than 30 min until ...
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2answers
54 views

Why worker nodes are not fault-tolerant?

A swarm manager nodes handles cluster management tasks such as: 1) Maintaining cluster state 2) Scheduling services 3) Serving swarm mode HTTP API endpoints You may execute any of the - docker ...
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109 views

what is the purpose of overlay network driver?

Below is the command run on ubuntu to create overlay network driver for swarm cluster instead of using bridge network driver $ docker network create -d overlay xyz $ docker network ls ...
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73 views

Performing maintenance on GFS2 inside pacemaker cluster

I will need to perform a maintenance on one of storage servers that provides GFS2 volume to a three node pacemaker cluster. Same cluster has an addition of 2 GFS2 volumes as well. Would it be safe to ...
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47 views

Run a shell script within an already running shell script

I have a small SLURM cluster, which I am using to run jobs. I run a script and while that script is running, I want to enter a specific key command "t + enter". I believe I should do it by submitting ...
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81 views

Is it okay to delete the .glusterfs directory?

My .glusterfs directory seems to be cluttered with hard links of files that are no longer on my cluster. I need a way to clean the .glusterfs directory so I can free up some space. I don't really need ...
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1answer
199 views

Slurm on desktop computers, how to prioritize the owner

In short: On a Slurm cluster, I need some computers to be available and responsive to their respective owners during work hours. Problem: I manage a small (but growing) heterogeneous cluster with ...
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Combining two nodes/servers into a cluster

We've got two computational nodes. Physically, they are in one room. One runs Linux Mint, the other -- CentOS. They share router and have the same external IP (router's). Router listens on different ...
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8 views

Is it possible to assign two VIP for 1 cluster(pcs)

Please help us to understand the below point. Is it possible to assign two VIP for 1 cluster(pcs). 10.0.2.3/ 10.0.2.5 both is assigned dchsdb. We are getting request from 10.0.1.2 in database, ...
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1answer
681 views

PCS Stonith (fencing) will kill two node cluster if first is down

I have configured a two node physical server cluster (HP ProLiant DL560 Gen8) using pcs (corosync/pacemaker/pcsd). I have also configured fencing on them using fence_ilo4. The weird thing will happen ...
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137 views

Pacemaker: stopping pacemaker doesn't always move resources to other node

I have created a 2 node cluster on sles12. Following is the configuration - msnode1:~ # crm --version crm 3.0.0 msnode1:~ # corosync -v Corosync Cluster Engine, version '2.3.6' ...
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10 views

Is there a configuration for SLES failover cluster?

I have two nodes configured as cluster and I am currently trying to test the failover but I was wondering if there would be a configuration file which could display the failover settings.
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21 views

OpenLDAP cluster: deletion of an entry is not replicated

We have an OpenLDAP 2.4 cluster of three nodes configured in multi-master and accessed through a VIP in round-robin. The three machines run RHEL7. We noticed that deletion of an entry (done from a ...
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1answer
127 views

How to verify which is primary node in a HANA DB cluster operating on SLES 12?

Currently I have two HANA DB servers in a cluster and replication is not running. Upon checking from SUSE Hawk, node 2 is acting as primary node and node 1 is available. How do I confirm that node 2 ...
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72 views

rsync error code 23 with galera cluster

We are using Galera cluster with three nodes which syncs with rsync. All databases are synced correctly except one, for which I get the code 23 error. It syncs the schema but not the data. How can I ...
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460 views

Pacemaker cluster service can't start properly Couldn't mount filesystem

I have 3 nodes MySQL cluster on RHEL 7.5 with DRBD, Pacemaker and after start cluster getting following error. How can I overcome ? [root@db1 ~]# pcs status Cluster name: mysql_cluster Stack: ...
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27 views

VM > Centos 7 3-node HAcluster (pacemaker & corosync) (httpd wont start)

I've setup my cluster I'm now configuring my resources (2nd link). cluster setup: https://www.golinuxcloud.com/ste-by-step-configure-high-availability-cluster-centos-7/ cluster resource: https://...
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2answers
277 views

Fencing of Redhat cluster 7 on VirtualBox

I am trying to create a 3 node Redhat Cluster 7 on Oracle VirtualBox VMs hosted on Windows Server 2012 R2. What agent can I use for fencing? How do I go about it? Note : I am creating a cluster for ...
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2answers
498 views

Expanding only certain variables inside a heredoc

This is an extension of the question I asked . Passing directory from command line to shell script I have a script which writes another script using a heredoc. I need to be able to write unexpanded ...
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133 views

Passing directory from command line to shell script [duplicate]

I want to pass directory as a command line argument to the shell script. #!/bin/bash sourcedir=/home/dir/data cd $sourcedir find "$PWD" -maxdepth 2 -name \*_R1*.fastq.gz > list1 fastq_list=$...
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1answer
94 views

restore $0 or $BASH_SOURCE after it is modified by the cluster

I am using a shared SLURM cluster. I am trying to get the path of the bash script from inside the script itself. There is already an excellent thread here: https://stackoverflow.com/questions/59895/...
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1answer
8 views

Redirect DB traffic dependent on type of request

I have a Postgres cluster managed by Patroni and want to be able to redirect DB requests to the replica if they are read requests and write requests to the master. Does anyone know of any tools that ...
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1answer
653 views

After failover Pacemaker moves resource back when node comes back

I'm using Pacemaker & Corosync for my cluster. When a node dies pacemaker moving my resources to another online node. Everything ok here. But when the dead node comes back, Pacemaker moving the ...
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1answer
446 views

PVS output not showing drive

I had created physical volume earlier i.e. /backup, /ndasdb, /processor, /latro. Don't know what exactly happened, but /ndasdb is not showing in any of this output result: Pvdisplay, Vgdisplay, and ...
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ORTE_ERROR_LOG, what does it mean?

1 [node18:02644] [[37701,0],0] ORTE_ERROR_LOG: File open failure in file ras_tm_module.c at line 142 2 [node18:02644] [[37701,0],0] ORTE_ERROR_LOG: File open failure in file ras_tm_module.c at line ...
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2answers
799 views

How do commands like fdisk -l find the sector size?

Does the MBR of the disk contain this information and therefore when i call a command like fdisk, a kernel level code eventually runs and reads it from a specific part in MBR? If so, which part of it? ...
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66 views

Distributed Block Device Cache for Linux

Is there an open source software available for Linux that implements a new block device based on an underlying block device (DRBD or shared SAN) and a distributed memory cache ? What I'm looking for ...
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1answer
358 views

Installing Percona XtraDB Cluster server

I want to Install the Percona XtraDB Cluster server package in Ubuntu 16.04.4 LTS but I got this error: sudo apt-get install percona-xtradb-cluster-57 Reading package lists... Done Building ...
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2answers
3k views

Memory Per Core [closed]

I am using the super computers in the network provided by Compute Canada and in the documentation page I see the following: I am quite curious - what is the concept of memory per core here? I thought ...
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1answer
39 views

Failover physical and virtual machine with replication. Is it possible?

I want to create HA cluster with 2 nodes. First node is physical machine, second is virtual (under ProxMox). Both running under Ubuntu. I know how to make HA with corosync and pacemaker. How i can ...
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1answer
35 views

NAT/Masquerade. Was working before, now is not

So for at least two months I had an IP tables configuration that was working on a compute cluster to provide internet access to compute nodes that were technically offline, via the headnode. We ...
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1answer
11k views

How to submit a job to a specific node using Slurm's sbatch command?

Our nodes are named node001 ... node0xx in our cluster. I wonder, is it possible to submit a job to a specific node using Slurm's sbatch command? If so, can someone post an example code for that?
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1answer
384 views

how to unexport NFS share on VCS HS cluster

**see imp update at bottom of orig. question. not sure how to unexport only the 'world' mountable share? I have a NFS server which had a share with world-mountable permissions. To make it mountable ...
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1answer
127 views

Clustered file services failure causes all nodes down? [closed]

I am planning a cluster of 3 active-active nodes running Red Hat Linux 6.7, with local and shared file systems, such that the 3 servers can read / write some shared files concurrently. However, my ...
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1answer
1k views

install Open MPI on HPC

I want to install OpenMPI on a linux HPC cluster with a Slurm resource manager. I know how to build OpenMPI regulariy from source , however, how do I install it so that it is installed properly on ...