parallel-ssh

parallel-ssh:

[ you need install pssh for parallel-ssh ]

Following are few of the features:

1. In the following command you are passing user@host:port and the ssh option after -x "for example the ssh key" and later the command. It will run the command on the remote system and put the output on the screen:

$ parallel-ssh -i -H "user@server:port" -x "-i key" "command"

Following is the command example if you have to pass the key, port and user parameter:
 
$ parallel-ssh -i -h <FileWithServersList> -x "-i key -p port" -l ubuntu "command"


Run a long command without timing out:
              pssh -i -h hosts.txt -t 0 sleep 10000


parallel-ssh --help
Usage: parallel-ssh [OPTIONS] command [...]

Options:
  --help                show this help message and exit
  -h HOST_FILE, --hosts=HOST_FILE
                        hosts file (each line "[user@]host[:port]")
  -H HOST_STRING, --host=HOST_STRING
                        additional host entries ("[user@]host[:port]")
  -l USER, --user=USER  username (OPTIONAL)
  -p PAR, --par=PAR     max number of parallel threads (OPTIONAL)
  -o OUTDIR, --outdir=OUTDIR
                        output directory for stdout files (OPTIONAL)
  -e ERRDIR, --errdir=ERRDIR
                        output directory for stderr files (OPTIONAL)
  -t TIMEOUT, --timeout=TIMEOUT
                        timeout (secs) (0 = no timeout) per host (OPTIONAL)
  -O OPTION, --option=OPTION
                        SSH option (OPTIONAL)
  -v, --verbose         turn on warning and diagnostic messages (OPTIONAL)
  -A, --askpass         Ask for a password (OPTIONAL)
  -x ARGS, --extra-args=ARGS
                        Extra command-line arguments, with processing for
                        spaces, quotes, and backslashes
  -X ARG, --extra-arg=ARG
                        Extra command-line argument
  -i, --inline          inline aggregated output for each server 
  -I, --send-input      read from standard input and send as input to ssh
  -P, --print           print output as we get it

Example: pssh -h hosts.txt -l irb2 -o /tmp/foo uptime


For timeout issue think of trying the following options:



As per the --help option:

-t TIMEOUT, --timeout=TIMEOUT
                        timeout (secs) (0 = no timeout) per host (OPTIONAL)

-I, --send-input      read from standard input and send as input to ssh
 
$ cat command1 | parallel-ssh -o Out1 -h prod36AS -x "-i jvxadm-oper-keypair.pem -p 1717" -l ubuntu -I
 
-t 0

Can also try the following:

parallel-ssh -t -1 [ timeout disable options ]

parallel-ssh -t -1 -h servers list "command"

How about trying with the ssh -o options?:

parallel-ssh -i -h prod36AS -x "-o ConnectTimeout=10 -i key -p 1717" -l ubuntu "sleep 12"
 
 
example script:


#!/bin/bash

echo" This command will take the following inputs and run the parallel ssh command"

read -p "Please enter the host file where you have all the host: " HostsFile
read -p "Please enter the key details: " AwsKey
read -p "Please enter the command that you want to run on remote servers: " RemoteCommands

/usr/bin/parallel-ssh -i -h $HostsFile -x "-i $AwsKey -p PORT" -l ubuntu "$RemoteCommands"



You might need to use rsync for quick update along with the backup of the file:

/usr/bin/sudo /usr/bin/rsync -vvrlb --backup-dir=/mnt/rsync-backup/ /source/{dir|file} /dest/{dir|file}

So,

Along with parallel-ssh:

/usr/bin/parallel-ssh -i -h $HostFile -x "-i $AwsKey -p port" -l <user> " 
/usr/bin/sudo /usr/bin/rsync -vvrlb --backup-dir=/mnt/rsync-backup/ /source/{dir|file} /dest/{dir|file}"

Few rsync options details again:

-v : copy symlinks as symlinks

-r : copy symlinks as symlinks

-l : copy symlinks as symlinks

-b: make backups (see --suffix & --backup-dir)
            --backup-dir=DIR        make backups into hierarchy based in DIR

 Further help:

$ parallel-ssh --help

$ man parallel-ssh