How to launch more than one instance using knife ec2

Question

How launch more than one instance using knife ec2, also is there any need of delay between launching the instances.

While lauching multiple instance using knife ec2 can we attach different roles to different instances

Answer 1

Honestly, when it comes to knife ec2 or any of the cloud providers, I use a wrapper bash+tmux script around it.

#!/bin/bash

tmux new-session -s build -n build -d "echo 'start'"
tmux new-window -t build -n backend
    tmux send-keys -t build:backend  "knife ec2 server create --server-name backend -N backend -E playpen -f 5 -I 9aa3b52b-1471-413f-8b2b-0fbc756491b4 -r 'role[base], recipe[ops::mysql_db_setup], ' -d ubuntu10.04-v4 --private-network" Enter
tmux new-window -t build -n web01
tmux send-keys -t build:web01 "knife ec2 server create --server-name web01 -N web01 -E playpen -f 5 -I 9aa3b52b-1471-413f-8b2b-0fbc756491b4 -r 'role[base],role[web]' -d ubuntu10.04-v4 --private-network" Enter
tmux new-window -t build -n web02
tmux send-keys -t build:web02 "knife ec2 server create --server-name web02 -N web02 -E playpen -f 5 -I 9aa3b52b-1471-413f-8b2b-0fbc756491b4 -r 'role[base],role[web]' -d ubuntu10.04-v4 --private-network" Enter
tmux new-window -t build -n background01
tmux send-keys -t build:background01 "knife ec2 server create --server-name background01 -N background01 -E playpen -f 2 -I 9aa3b52b-1471-413f-8b2b-0fbc756491b4 -r 'role[base],role[background]' -d ubuntu10.04-v4 --private-network" Enter

tmux attach-session -t build
tmux select-window -t build

Or at least something to that effect.