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From: | Larry Ploetz |
Subject: | Re: Couple Minor “Bugs” (?) (gnuparallel: message 18 of 20) |
Date: | Sat, 11 Jun 2022 14:47:11 -0700 |
User-agent: | Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.10.0 |
On Fri, Jun 10, 2022 at 12:54 AM Larry Ploetz <lploetz.sg@gmail.com> wrote:I'm trying to use ssh's proxy (-J flag) with GNU parallel. The -J flag on ssh allows multiple hosts to be specified with commas between them.You clearly already know the , is the culprit.
Yep! Took a bit of sleuthing.
larryp-MBP:~ larry$ seq 48 | parallel -j0 --sshlogin '24/ssh -JINTHOST1,INHOST2 TARGETHOST' echo {}I am not sure how this should be solved. --sshlogin allows you to specify multiple sshlogins separated by comma: parallel --sshlogin host1,host2 or: parallel --sshlogin "myssh host1,myssh host2" or: parallel --sshlogin "24/ssh host1,16/ssh host2" So the problem here is that comma is used in the ssh command.
Oh, that's the reason. Make sense.
Also, in attempting to get around that limitation: larryp-MBP:~ larry$ seq 48 | parallel -j0 --sshlogin '24/ssh -JINTHOST1\,INTHOST2 TARGETHOST' echo {}And currently GNU Parallel does not support that: It splits on , even if preceded by \ . But this might be a reasonable solution - it is definitely doable. Though I cannot recall ever seeing a situation in which you use \, Currently you can workaround this by using ~/.ssh/config: here you can put in ProxyJump for TARGETHOST.
I just wrote a script and used --sshlogin
'24//path/to/script TARGETHOST'. The .ssh/config would
work but (in my situation) that would require different host
entries for the same hostname. Not a big deal, but the script
seemed easier in my case.
Or if the JumpHosts are the same for all servers: parallel --ssh 'ssh -JINTHOST1,INTHOST2' --sshlogin 24/TARGETHOST
Oh! Didn't think of using both --ssh and --sshlogin - that would have worked in my case.
To everyone else: What do you think? Is \, the right solution here? Would ,, be better (it might be less intuitive but cause less quoting stress)?
I like the double comma idea, FWIW. I also unfortunately like the
idea of quoting to indicate the comma isn't part of the target
host specification, but that could get real messy fast. Too bad
ssh doesn't have the idea of -I.
;-)
/Ole
· Larry
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