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alexice
n00b
Joined: 08 Nov 2004
Posts: 30
Location: Vancouver, Canada
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 Posted: Thu Oct 04, 2007 12:14 am Post subject: [SOLVED] Can't run programs on diskless nodes |
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Hello everybody,
I hope I did not miss any posts about this, and if, sorry for reposting the issue. I have a diskless cluster up and running since quite some time. Everything works nice if I start jobs from the master and the slaves are running smooth, MPI stuff and such things, no problem.
Now I ran into the problem, that if I want to start an application on a node when I log onto the node via ssh, than I always get:
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-bash: ./gmsh: No such file or directory
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here the app I want to run is called gmsh and I am in the directory.
Now I think I have set up my diskless NFS export quite right, but to be sure here the configs:
/etc/exports
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# /etc/exports: NFS file systems being exported. See exports(5).
## node 1
# one line like this for each slave
/diskless/192.168.1.11 192.168.1.11(sync,rw,no_root_squash,no_all_squash)
/diskless/192.168.1.12 192.168.1.12(sync,rw,no_root_squash,no_all_squash)
/diskless/192.168.1.13 192.168.1.13(sync,rw,no_root_squash,no_all_squash)
/diskless/192.168.1.14 192.168.1.14(sync,rw,no_root_squash,no_all_squash)
# common to all slaves
/opt 192.168.1.0/24(sync,ro,no_root_squash,no_all_squash)
/usr 192.168.1.0/24(sync,rw,no_root_squash,no_all_squash)
/home 192.168.1.0/24(sync,rw,no_root_squash,no_all_squash)
/var/log 192.168.1.11(sync,rw,no_root_squash,no_all_squash)
/var/log 192.168.1.12(sync,rw,no_root_squash,no_all_squash)
/var/log 192.168.1.13(sync,rw,no_root_squash,no_all_squash)
/var/log 192.168.1.14(sync,rw,no_root_squash,no_all_squash)
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and to see how node2 (192.168.1.12) is mounting the shared directories, the fstab from node 2:
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192.168.1.10:/diskless/192.168.1.12 / nfs sync,hard,intr,rw,rsize=8192,wsize=8192 0 0
192.168.1.10:/opt /opt nfs sync,hard,intr,ro,rsize=8192,wsize=8192 0 0
192.168.1.10:/usr /usr nfs sync,hard,intr,nolock,rw,rsize=8192,wsize=8192 0 0
192.168.1.10:/home /home nfs sync,hard,intr,rw,rsize=8192,wsize=8192 0 0
# NOTE: The next line is critical for boot!
none /proc proc defaults 0 0
# glibc 2.2 and above expects tmpfs to be mounted at /dev/shm for
# POSIX shared memory (shm_open, shm_unlink).
# (tmpfs is a dynamically expandable/shrinkable ramdisk, and will
# use almost no memory if not populated with files)
# Adding the following line to /etc/fstab should take care of this:
none /dev/shm tmpfs defaults 0 0
192.168.1.10:/var/log /var/log nfs hard,intr,rw 0 0
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All the other nodes do the same thing.
I am pretty sure I miss something, but so far I can't remember what and also I did not find alot on the forum. I anybody has had this problem and has a solution, would be great to get it posted here.
Any suggestions or comments are very much appreciated! 
Cheers,
alexice
_________________
if you have to ask:
"why Linux?"
you will not understand the answer
Last edited by alexice on Thu Oct 04, 2007 5:49 pm; edited 1 time in total |
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eccerr0r
Watchman
Joined: 01 Jul 2004
Posts: 9679
Location: almost Mile High in the USA
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| Posted: Thu Oct 04, 2007 12:52 am Post subject: |
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Usually those weird "No such file or directory" problems are due to your dynamic library missing (ld.so, ld-linux.so) - did you compile the program properly for the machine you're running it on?
Just a guess...
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alexice
n00b
Joined: 08 Nov 2004
Posts: 30
Location: Vancouver, Canada
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| Posted: Thu Oct 04, 2007 1:07 am Post subject: |
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Well, thing is the programs which are not working are actually not compiled on the cluster. It's Matlab, which is closed source and also gmsh, which came precompiled.
Is there a way I can do something without compiling the apps again?
Thanks for the hint.
alexice
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if you have to ask:
"why Linux?"
you will not understand the answer |
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alexice
n00b
Joined: 08 Nov 2004
Posts: 30
Location: Vancouver, Canada
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| Posted: Thu Oct 04, 2007 5:48 pm Post subject: |
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thanks eccerr0r for the hint about the libraries, that was the problem. Since the software (matlab) which I was running on the cluster needed some 32 bit libs, I just had to share those as well with the cluster nodes. Interestingly matlab also need the /tmp file to be shared to work, I did not look into that, but if one shares the /tmp as well, things work.
Thanks again 
alexice
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"why Linux?"
you will not understand the answer |
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