I combined Gary's solution above with a fork of the RightAWS library
(http://github.com/appoxy/aws/tree/master) to loop over a
describe_instance call until the status of the launched server is
"Running". You can then return the public dns (or whatever
information you need).
desc "Launch one new instance"
task :run_instance do
@ec2 = RightAws::Ec2.new(AWS_ACCESS_KEY, AWS_SECRET_KEY)
@ret = @ec2.launch_instances(AMI_ID,
:addressing_type => "public",
:group_ids => SECURITY_GROUPS,
:key_name => KEYNAME,
:availability_zone => AVAIL_ZONE)
puts "Launched Instance: " + @ret[0][:aws_instance_id].to_s
puts "Server is launching, should take about 2 minutes."
tries = 0
begin
@instance_info = @ec2.describe_instances([...@ret[0]
[:aws_instance_id]])
raise StandardError, "Pending...." unless @instance_info
[0][:aws_state] == "running"
puts "Server Launched!\n"
puts "Availability Zone: #...@instance_info[0][:aws_state]}"
puts "Public DNS: #...@instance_info[0][:dns_name]} \n\n"
set :ec2host, @instance_info[0][:dns_name]
puts "Waiting 10 seconds for server's SSH to start......."
sleep 10
rescue
puts ". "
sleep 3
tries += 1
retry unless tries == 100
puts "We did not see the server start within 3 minutes.
Please check AWS console for actual information."
end
end
Hope this is also helpful in some way.
--
Chad
http://blog.appoxy.com
On Aug 1, 7:37 am, Gary Richardson <[email protected]> wrote:
> You can use the EC2 API to generate a list of hosts for you at runtime. This
> is the same as working with any inventory system:
>
> 1) write a task or function to generate a list of hosts. For example, use
> the EC2 API. You could even have it classify your hosts based on security
> groups so they aren't all in one
> bucket. I've found I need to stick this into a global array as I can't
> call 'role' from inside of a task.
> 2) at the top of your Capfile, do something like:
>
> task :GenerateHostList
> hosts = Hash.new
>
> // work magic with the EC2 API to populate hosts here
>
> set :ec2hosts, hosts
> end
>
> GenerateHostList
>
> role :databases do
> ec2hosts['databases']
> end
>
> role :webservers do
> ec2hosts['webservers']
> end
>
> I've found the EC2 API's to be a bit slow when you're not on EC2, so I've
> added a caching mechanism as well. I dump the hosts data structure to a file
> and load that if it's found. I then delete the file when adding/removing
> hosts.
>
>
>
> On Thu, Jul 30, 2009 at 10:45 PM, johne <[email protected]> wrote:
>
> > Having trouble trying to dynamically set host on a task at runtime.
> > Basically I want to set the host dynamically when task is run. I
> > tried set with a block, but no luck.
>
> > For example, I want this....
>
> > task :mount_ebs, :hosts => host do
> > sudo "mkdir /ebs1"
> > sudo "mount -t xfs /dev/sdh /ebs1"
> > end
>
> > where host is dynamically generated at task run time....
>
> > any help greatly appreciated
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