how-to scp file and run one-liner on multiple pkk configured hosts via ssh

# == START run ssh cmd and copy files in parallel on multiple hosts

export ssh_user="type_your_ssh_user_here"

#build the host names containing list file

export hosts_file=/tmp/hosts.lst

cat <<EOF > $hosts_file

managementnode1

datanode1

datanode2

datanode3

EOF

# define the name of the file to deploy on the hosts

export file=/etc/ssh/sshd_config

# optionally run any cmd on the hosts

export cmd="sh /opt/anc/anp/sfw/sh/file-saver.sh -f $file"

# run ssh in subshells in parallel and scp the file to all hosts

cat $hosts_file | while read -r host ; do ( \

echo -e "\n\n START $host" ; \

ssh $ssh_user@$host "$cmd" ; \

scp -p $file root@$host:$file \

& )& done ;

# clean-up

rm -fv $hosts_file

# == STOP run ssh cmd and copy files in parallel on multiple hosts