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14
votes
1answer
16k views

How does tcp-keepalive work in ssh?

I am trying to code a shell-script that uses a ssh-connection for doing "heartbeats". I want to terminate the client- and server-side of that connection after a certain timeout (after the connection ...
9
votes
2answers
912 views

How to build a personnal cluster?

I have a debian server running some services (mail, web, git, mysql...). But it is alone, meaning that if it breaks, I have to repair it to access my services. I'd like to put a second server so that ...
9
votes
5answers
473 views

Directory sync with automatic peer discovery

I'm working with a cluster of Linux servers sitting behind the Amazon cloud autoscaling feature (documentation). There are files that accumulate on each server, they are cache files for the ...
7
votes
3answers
2k views

How to set up “poor man's” Linux desktop cluster?

There are several small Linux/Android devices on the market with 1 GHz ARM processor, 512 MByte RAM and cca. 4 Gbyte storage for $35-$40. If I buy 5 pcs, it's only around $200. Let's say, we have ...
6
votes
2answers
285 views

Straightforward Linux Clustering

We have many unused PC machines and we would like to use them to set up educational lab for high performance computing applications. Which Linux distribution is the most convenient to set up and easy ...
6
votes
2answers
1k views

Small Distributed Computing Cluster

I'm a high school student trying to build a linux cluster for a project (I have a bunch of decent computers slated for re-image this summer, so the tech department basically says as long as I don't ...
5
votes
1answer
392 views

Running parallel bash jobs on a HPC cluster using GNU parallel

On an HPC cluster I am trying to run multiple bash scripts (permute2.sh) from 1 bash script using GNU parallel, however it doesn't complete every job. It randomly completes one job, while it is stuck ...
4
votes
3answers
1k views

On Ubuntu Linux, is it normal for mandb to run continuously (apparently in the background)?

I have access to a Ubuntu Linux node at my institution. The nodes are shared among the group, but typically I am the only person who uses this particular node. I am running a calculation in parallel ...
4
votes
2answers
153 views

Setup linux cluster like Windows with CentOS or Ubuntu? [closed]

Along the lines of this MSDN article, how would you setup a pair of Ubuntu or CentOS (or RHEL) servers in a cluster so they appear to hosted applications as a single server, but will continue to work ...
3
votes
1answer
169 views

How does ZFS grow/scale?

I am wondering how would one design a ZFS system to build something that is massively scalable, along the lines of your favorite cloud storage, but with all the neat benefits the come with ZFS. A ...
3
votes
0answers
113 views

Corosync/Pacemaker cluster loss of synchronization

I'm facing a problem with the corosync and pacemaker cluster software. I've two virtual nodes (Scientific Linux 6.4) and corosync/pacemaker installed on them: corosync-1.4.1-17.el6.x86_64 ...
3
votes
0answers
173 views

Should I investigate Rocks or Ubuntu/Mosix for building a cluster?

I work at a college doing system administration. Someone in their lab is looking to build a cluster for running complex Octave and C++ projects. They have brand new modern machines. My question is ...
2
votes
2answers
410 views

comm fails on bash variable input

I have a script that's supposed to get the list of files of two directories, get differences and execute some code for certain files. These are the commands to get the file lists: list_in=$(find ...
2
votes
2answers
375 views

How can I mount vxfs FS to two or more Solaris servers?

I want to have two Solaris servers share the same SAN vxfs Filesystem. Though at a time just one would be accessing the share. This is to allow for a quick failover in case the primary server ...
2
votes
1answer
3k views

How do I download and launch a JNLP file in CentOS?

I'm using Amazon's GPU cluster to experiment with some HPC java code on CentOS. The Java application is in JNLP format and has a GUI. I've followed Amazon's getting started video, but I'm not ...
2
votes
0answers
76 views

Recommendations for replacing a GFS cluster?

I have a couple of CentOS GFS-clusters (GFS as in Global File System) using a shared disk in a Fibre Channel SAN. They are mature now, and the time has come to start planning for their replacement. ...
2
votes
0answers
74 views

mpd daemon prematurely ending jobs

I am a little out of my depth here so bear with me. I am trying to configure mpirun and mpiexec to run software called Materials Studio on a 1 node, 2 processor, 12 core cluster. The submission scheme ...
1
vote
4answers
890 views

How to find which machines are idle on a cluster of many nodes

I run measurements on a cluster consisting of 32 nodes/machines. I do not require all nodes, only 4, for example. The problem is most of the time, the nodes are busy with other people running their ...
1
vote
1answer
48 views

what is the difference between qsub and ./

Can anyone tell me the difference between the following ways of submitting a script: $ qsub script_name.sh and ./script_name.sh What are the differences between the above two ways of submitting ...
1
vote
1answer
38 views

Will having dozens of inactive logins hurt performance

I work on a cluster shared with ~20 users, many of them operating remotely. It's quite common to open the login node, type users and see ~100 users listed, mostly the same user logged in multiple ...
1
vote
3answers
317 views

NFS Automatic Fail-over or Load-balanced or Clustering?

I've been using NFS (and it is the only one i know well in Network Files) for a few years. But still can not able to find out .. How to make NFS Servers in Clustered Design (or Load-balanced?) Or at ...
1
vote
2answers
904 views

Clustering Servers to run one vm

I am looking at clustering about five machines and I wanted to get some opinions about what is the best way to go about it. I'm wanting to run one VM over the five machines, firstly I want to ask, 1: ...
1
vote
1answer
1k views

EMC storage + powercf command + powerpath

When I run powercf -q on my Solaris machine, what changes does this command do on the EMC storage, or on Solaris file system? From manual page: DESCRIPTION During system boot on Solaris hosts, ...
1
vote
2answers
36 views

can I tell to useradd to execute a script? Maybe in /etc/default/useradd?

There are plenty of people that already answered to the question "how to execute useradd properly in a script?" My question is: "is it possible to tell to useradd to execute one script when it is ...
1
vote
1answer
33 views

Oracle 11gR2 grid silent installation: error for privateinterconnects

I am installing Oracle grid 11gR2 using silent install with response file. I am getting error after "Collecting interface information for node 1" in logs. I have a feeling that this could be due to ...
1
vote
1answer
152 views

HAProxy should not forward an incoming request to down instance

In my scenario, I have 2 servers, both are communicating with HAProxy. When a request comes in, HAProxy splits the request and sends it to both servers, following a round robin method. If in any case ...
1
vote
0answers
34 views

Can data be “clustered” on disk? If so, how?

Can linux be set to "automatically" cluster data in the way a clustered index does on SQL Server/MySQL or Postgres but a little better? websocket++ allows for fully persistent and shared memory ...
1
vote
1answer
60 views

Strategies for building distributed computing system with hybrid Mac and Linux systems

I want to build a distributed computing system to run Matlab, C and other programming languages for scientific computing. Now I've several old Mac machines with Lion Mac OS installed acted as web ...
1
vote
0answers
121 views

Getting from proficient to expert [closed]

I've got my vacation coming in and thought I might use that for something useful. Essentially, I've been a Linux user since around 1995 when I installed Slackware 2.0 on my computer and have been ...
0
votes
1answer
301 views

Script for running sequential job

I started recently to learn using Linux. I want to write a script in bash shell to run a serial job on a cluster. I have been searching for hints and instructions on how to write such a script. I ...
0
votes
1answer
188 views

Samba on a Beowulf Cluster

Is this possible? I have only been able to locate resources related to running scientific applications. Any resources would be helpful. Regards
0
votes
0answers
25 views

check/change reserve policy on a virtual disk

I need to check if a Virtual Disk has this policy enable, if so I need to reserve_policy=no_reserve I need to create an DB2 Database Cluster I cannot find a Linux Command for that. I do know if this ...
0
votes
2answers
389 views

Kill nohup command on cluster

Last night I launched a command via nohup on a cluster and then closed the connection. Today I would like to kill this job (I know it's still running because output is being generated in an output ...
0
votes
0answers
121 views

Job IDs and their meaning/reference

Using Red Hat, I sent few jobs to a cluster and got "job IDs" in return. Using qstat I can see only one is running, one was canceled and the rest are still in the queue. I wrote something like this: ...
-1
votes
1answer
85 views

zero downtime on server [duplicate]

The scenario is, I have two web servers both are running nginx on it, also I have configured haproxy after the LB for both the servers, I have checked with heartbeat, but no luck to make downtime ...