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Use gsh to run the same command on many servers

Discussion in 'Linux Other' started by Rob, May 22, 2017.

  1. Rob

    Rob Administrator
    Staff Member

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    At some point you will find it very handy to be able to run the same command on multiple servers. Sure, you could just put a list of IPs in a file and run something against it using a for loop, but gsh is going to make your life much easier.

    First off, i've used the old 'list of ips' way in the past - especially if I have an easy list of servers that are all the same and know that I want to group them all together. gsh, on the other hand, will allow you to run the same command on various servers sorted by category, similar to ansible.


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    You still need to maintain a list of your servers, but it's worth it. Also, you'll want to have ssh keys set up on each of the servers from your 'gsh-server'.

    Some examples
    Want to check the openssh version on each of your cent6 and cent7 machines?
    Code:
    gsh cent6+cent7 "rpm -q openssh"
    How about uptime on all of your VPS?
    Code:
    gsh vps "uptime"
    How about uptime on all of just the cent6 vps machines?
    Code:
    gsh vps^cent7 "uptime"
    An example /etc/ghosts file
    Each installation of gsh requires a valid /etc/ghosts file (yes.. you can pronounce it "gee hosts"). Here's an example one which ties in our examples from above:
    Code:
    # Hostname    Hardware    OS
    abc.linuxforum.com    vps        cent6
    def.linuxforum.com    vps        cent7
    ghi.linuxforum.com    metal    cent6
    Download / Install it
    You can download gsh from here:
    http://outflux.net/unix/software/gsh/


    Once you unpack it and cd into its directory, you can install it with:
    Code:
    perl Makefile.PL
    make
    make install
    Then, Start your /etc/ghosts file. You can have as many categories as you like. Some popular ones can be location / dc, os, hardware, etc..

    Have fun with it - and let us know how it goes!
     

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