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# 7.2. DSH, Distributed Shell

At the time of this writing (May 2003) DSH's most current release is available from http://www.netfort.gr.jp/~dancer/software/downloads/ More info on the package can be found on http://www.netfort.gr.jp/~dancer/software/dsh.html The latest version available for download is 0.23.6 You will need both libdshconfig-0.20.8.tar.gz and dsh-0.23.5.tar.gz Start with installing libdshconfig

    ./configure
    make
    make install

Repeat the process for the dsh package.

Say we have a small cluster with a couple of nodes. To make life easier we want type each command once but have it executed on each node. You then have to create a file in $HOME/.dsh/group/clusterwname that lists the ip's of your cluster. eg.

    [root@inspon root]# cat .dsh/group/mosix
    192.168.10.220
    192.168.10.84

As an example we run ls on each of these machines We use -g to use the mosix group (this way you can create subsets of a group with different configurations)

    [root@inspon root]# dsh -r ssh -g mosix ls
    192.168.10.84: anaconda-ks.cfg
    192.168.10.84: id_rsa.pub
    192.168.10.84: install.log
    192.168.10.84: install.log.syslog
    192.168.10.84: openmosix-kernel-2.4.17-openmosix1.i686.rpm
    192.168.10.84: openmosix-tools-0.2.0-1.i386.rpm
    192.168.10.220: anaconda-ks.cfg
    192.168.10.220: id_dsa.pub
    192.168.10.220: id_rsa.pub
    192.168.10.220: openmosix-kernel-2.4.17-openmosix1.i686.rpm
    192.168.10.220: openmosix-tools-0.2.0-1.i386.rpm
    192.168.10.220: oscar-1.2.1rh72
    192.168.10.220: oscar-1.2.1rh72.tar.gz

Note that neither of the machines ask for a password. This is because we have set up RSA authentication between the different accounts. If you want to run commands with multiple parameters you will either have to put the command between quotes.

    [root@inspon root]# dsh -r ssh -g mosix "uname -a"
    192.168.10.84: Linux omosix2.office.be.stone-it.com 2.4.17-openmosix1 #1
    Wed May 29 14:32:28 CEST 2002 i686 unknown
    192.168.10.220: Linux oscar0 2.4.17-openmosix1 #1 Wed May 29 14:32:28 CEST
    2002 i686 unknown

or use the -c -- option. Both give basically the same output.

    [root@inspon root]# dsh -r ssh -g mosix -c -- uname -a
    192.168.10.220: Linux oscar0 2.4.17-openmosix1 #1 Wed May 29 14:32:28 CEST
    2002 i686 unknown
    192.168.10.84: Linux omosix2.office.be.stone-it.com 2.4.17-openmosix1 #1
    Wed May 29 14:32:28 CEST 2002 i686 unknown

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