Run ssh commands remotely for one or many or a list of servers

single:

ssh -o “StrictHostKeyChecking no” -t ${server} ‘sudo sed -ibak -e ‘s#https://oldchef.server.com/#https://newchef.server.com/#g’ /etc/chef/client.rb’

many:

for server in server001 server002 server007; do echo ${server} & ssh -o “StrictHostKeyChecking no” -t ${server} ‘sudo sed -ibak -e ‘s#https://oldchef.server.com/#https://newchef.server.com/#g’ /etc/chef/client.rb’ ; done

list:

for server in `cat nodelist.txt`; do echo ${server} & ssh -o “StrictHostKeyChecking no” -t ${server} ‘sudo sed -ibak -e ‘s#https://oldchef.server.com/#https://newchef.server.com/#g’ /etc/chef/client.rb’ ; done

where nodelist.txt is like:

server001

server002

server003

server004

server005

server006

server007