Difference between revisions of "Execute a command in parallel by ssh"
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↑ https://unix.stackexchange.com/questions/428997/on-which-host-does-this-parallel-command-hang
↑ https://unix.stackexchange.com/questions/428997/on-which-host-does-this-parallel-command-hang
(Created page with " # /Execute a command in parallel by ssh/ in MACHINE1 and MACHINE2 using parallel :<code>parallel ssh {} 'COMMAND' ::: MACHINE1 MACHINE2</code><ref>https://unix.stackexc...") |
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− | # [[ | + | # [[Execute a command in parallel by ssh]] in MACHINE1 and MACHINE2 using parallel |
:<code>parallel ssh {} 'COMMAND' ::: MACHINE1 MACHINE2</code><ref>https://unix.stackexchange.com/questions/428997/on-which-host-does-this-parallel-command-hang</ref>. See also [[pssh]]. | :<code>parallel ssh {} 'COMMAND' ::: MACHINE1 MACHINE2</code><ref>https://unix.stackexchange.com/questions/428997/on-which-host-does-this-parallel-command-hang</ref>. See also [[pssh]]. |
Revision as of 07:49, 26 December 2019
- Execute a command in parallel by ssh in MACHINE1 and MACHINE2 using parallel
parallel ssh {} 'COMMAND' ::: MACHINE1 MACHINE2
[1]. See also pssh.parallel -q ssh {} 'ECHO "TEST"; COMMAND' ::: MACHINE1 MACHINE2
[2]- -q quote command. The command must be a simple command (see man bash) without redirections and without variable assignments. This will quote the command line and arguments so special characters are not interpreted by the shell.
Using variables:
parallel -q ssh {} "echo {}; $COMMAND" ::: $MACHINES
or creating a basic shell script:
#!/bin/bash MACHINES="$1" COMMAND="$2" if [ $# -eq 0 ]; then echo -e '\nUSAGE: $0 "machine1 machine2 machine3" "command"\n' exit 0 fi parallel --keep-order -q ssh {} "echo {}; $COMMAND" ::: $MACHINES
You can have a similar solution with a for
loop but in this case command output will be mixed between both commands.
for HOST in HOSTNAME1 HOSTNAME2; do ssh $HOST "COMMAND" & done
See also
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