Speaking of mass execution on thousands of hosts, I've used Perl 'netrun' to a
great extent in the recent past. Note that ansible core does great things in
this fashion as well but may be a little slower than pdsh or netrun.
My 2c,
Vincent
Sent from TypeApp
On Jan 10, 2018, 19:03, at 19:03, Stephen Dowdy <sdo...@ucar.edu> wrote:
>On 01/10/2018 03:27 PM, Patrick Boutilier wrote:
>> What I would do is download the BIOS update file once and then create
>a script to rsync it to the 1500 hosts and run the update. I presume
>you would have a script to run dsu on the 1500 hosts anyway?
>
>First: i gave up on using Dell's enterprise management tools due to
>constant heartache/headache/frustration. It definitely makes me sad
>that these tools continually change, but never actually get much
>better. (okay, it looks like they are finally attacking the BASHisms
>in some of their scripts that borked Debian/Ubuntu systems badly, but
>the continual lack of correctness/current-cy, etc just pains me).
>
>Second:
>
>FYI, LLNL's 'pdsh' works great for this. requires ssh public key trust
>for 'root' in my following examples to do the following (running DUPs
>requires 'root'):
>** note that your public key should be offline until loaded in your
>ssh-agent (oof, Meltdown/Spectre, sigh)
>WARNING: as any tool that allows mass-execution, if you screw up,
>you've now multiplied that screwup to a large number of systems, so
>always be careful.
>
>If you have a file of hostnames already:
>
> pdsh -lroot -g {file} 'command-to-run-on-all-remote-systems'
>(file is usually dshgroup module selected so ~/.dsh/group/{file} or
>/etc/dsh/group/{file})
>
>If you wanna hit everything in /etc/hosts, instead:
>
>awk '$0!~/^(#.*| *)$/{print$2}' /etc/hosts | WCOLL=- pdsh -Rexec scp
>FOO-2.7.0.BIN root@%h:/dev/shm/
>explained: all non-comment/blank lines, print hostname (field 2), setup
>pdsh's WCOLL envvar as the file containing hostnames to stdin (-), use
>the exec module to scp your DUP.BIN file, substituting %h for each
>hostname successively.
>awk '$0!~/^(#.*| *)$/{print$2}' /etc/hosts | WCOLL=- pdsh -lroot
>'/dev/shm/FOO-2.7.0.BIN -q'
>now, issue 'ssh' session to all hosts to run the DUP.BIN with '-q'.
>('-q' doesn't display changelog or prompt to run, also won't reboot
>after completion automatically)
>
>Note that 'pdsh' fans-out commands, running "N" jobs simultaneously
>(default 32). I limit mine to 8 so i can use some special gateway-hop
>syntax with custom ./ssh/config rules to bounce past the admin nodes on
>clusters into the backend compute nodes. This avoids the default
>'sshd' connection throttling limits (usually 10 simultaneous
>connections) (e.g. cluster1-admin!!node3) using the ssh-config rule:
>
> Host *!!*
> GatewayPorts no
>ProxyCommand $(h="%h";p="%p" ; echo ssh -W ${h##*\!\!}:%p -l root
>${h%%\!\!*})
>
>It's much easier to use libgenders or dshgroup style files for this
>kind of thing (than /etc/hosts and awk, etc), so you can use attribute
>selectors (genders) like:
>
> gpsh -lroot -g 'model=poweredge_r730' 'do-something'
>(it's up to you to create a genders file with the right attributes
>filled in)
>
>records in my genders file, as created from a scripted MySQL asset
>database extraction look like:
>
>host99
>name=host99,manu=dell,model=precision_t3400,hwtype=desktop,sn=XXXXXXX,os=debian_linux,status=in_use,user=godot,responsible=godot,purpose=user_room_linux,sa1=sdowdy,project=unknown,location=fl2-2094
>
>Unfortunately, 'genders' doesn't support REGEX :-( but you can use
>regex selection on hostnames in pdsh (just not attributes), like:
>
> pdsh -lroot -g 'hwtype=desktop' -w '/engr-.*/' ...
>
>to only hit the systems that are desktops and filter-down to only names
>with "engr-" in them.
>
>--stephen
>
>--
>Stephen Dowdy - Systems Administrator - NCAR/RAL
>303.497.2869 - sdo...@ucar.edu -
>http://www.ral.ucar.edu/~sdowdy/
>
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