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.
larryp-MBP:~ larry$ seq 48 | parallel -j0 --sshlogin '24/ssh
-JINTHOST1,INHOST2 TARGETHOST' echo {}
parallel: Warning: ssh to INTHOST2 TARGETHOST only allows for 0 simultaneous
logins.
parallel: Warning: You may raise this by changing
parallel: Warning: /etc/ssh/sshd_config:MaxStartups and MaxSessions on
INTHOST2 TARGETHOST.
parallel: Warning: You can also try --sshdelay 0.1
parallel: Warning: Using only -1 connections to avoid race conditions.
parallel: Warning: ssh to ssh -JINTHOST1 only allows for 0 simultaneous
logins.
parallel: Warning: You may raise this by changing
parallel: Warning: /etc/ssh/sshd_config:MaxStartups and MaxSessions on ssh
-JINTHOST1.
parallel: Warning: You can also try --sshdelay 0.1
parallel: Warning: Using only -1 connections to avoid race conditions.
parallel: Error: Cannot run any jobs.
If there's only one proxy host everything works as expected.
Also, in attempting to get around that limitation:
larryp-MBP:~ larry$ seq 48 | parallel -j0 --sshlogin '24/ssh
-JINTHOST1\,INTHOST2 TARGETHOST' echo {}
parallel: This should not happen. You have found a bug. Please follow
https://www.gnu.org/software/parallel/man.html#reporting-bugs
Include this in the report:
* The version number: 20220530
* The bugid: SSHLogin parser failed on '88/ssh -JINTHOST1\' => '\'
* The command line being run
* The files being read (put the files on a webserver if they are big)
If you get the error on smaller/fewer files, please include those instead.
See similar results with “-j1” flag to parallel, resulting in command
not found:
larryp-MBP:~ larry$ seq 4 | parallel -j1 --sshlogin '2/ssh -J
INTHOST1,INTHOST2 TARGETHOST' echo {}
/Users/larry/bin/bash: line 1: INTHOST2: command not found
/Users/larry/bin/bash: line 1: INTHOST2: command not found
/Users/larry/bin/bash: line 1: INTHOST2: command not found
kex_exchange_identification: Connection closed by remote host
Connection closed by UNKNOWN port 65535
Thanks,
· Larry
