discusion related to cluster mecanism.

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43
votes
1answer
49k 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 ...
38
votes
1answer
2k views

How do I distribute a large download over multiple computers?

I need to download a large file (1GB). I also have access to multiple computers running Linux, but each is limited to a 50kB/s download speed by an admin policy. How do I distribute downloading this ...
3
votes
1answer
76 views

NFS file with same name but different content depending on host

I have cluster using NFS with a program myprogram which writes to a fixed location, e.g. /home/sharedfs/somedir/somefile.txt. This means that if you run myprogram from each node, they all write to the ...
2
votes
1answer
117 views

reduce bandwidth consumption from downloading yum updates

I have several machines (7) running fedora and would like to reduce the amount of external bandwidth I am consuming. I see that there were several attempts to setup mirrors, but those projects seem ...
2
votes
2answers
1k 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 ...
1
vote
2answers
114 views

host can't ssh guest, but guest can

This is a follow-up question from: Make virtualbox get a different IP address than my laptop. I ended up with these /etc/hosts files on both my laptop running Ubuntu 14.04 (the host) and my virtualbox ...
0
votes
1answer
180 views

Make virtualbox get a different IP address than my laptop

I am trying to setup a 2-node Hadoop cluster (following this guide), where the master is going to be my Ubuntu laptop and the slave a virtualbox running ubuntu. I also read about networking in ...