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SSH into an EC2 instance by name.
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#!/usr/bin/env ruby | |
instance_name = ARGV[0] | |
abort "Please specify an instance name" unless instance_name and instance_name.length > 0 | |
instance_info, selected_instance = {}, nil | |
info_keymap = {2 => :ami_id, 3 => :address, 5 => :status, 6 => :keypair_name} | |
instances = `ec2-describe-instances`.split("\n").map{|l| l.split("\t")} | |
instances.each do |line| | |
case line.first | |
when 'INSTANCE' | |
keys = info_keymap.keys | |
instance_id = line[1] | |
this_instance = Hash[*info_keymap.values_at(*keys).zip(line.values_at(*keys)).flatten] | |
instance_info[instance_id] = this_instance | |
when 'TAG' | |
if line[1] == 'instance' and line[3] == 'Name' | |
selected_instance = line[2] if line[4] == instance_name | |
end | |
end | |
end | |
abort "No instance named #{instance_name}!" unless selected_instance | |
instance = instance_info[selected_instance] | |
abort "Instance is not running!" unless instance[:status] == 'running' | |
instance_address = instance[:address] | |
keypair_name = instance[:keypair_name] | |
ec2_home = `echo $EC2_HOME`.chomp | |
keyfile = "#{ec2_home}/#{keypair_name}.pem" | |
abort "No private key matching '#{keypair_name}' found in #{ec2_home}!" unless File.exists? keyfile | |
exec "ssh -i #{keyfile} -l ec2-user #{instance_address}" |
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