Execute a command in parallel by ssh
Jump to navigation
Jump to search
↑ 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
- 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
Advertising:
