[chef] Re: Delaying evaluation in chef provisioning script to pass dynamically assigned IDs

[Daniel DeLeo < >]

On Thursday, January 29, 2015 at 6:41 PM, Christine Draper wrote:

> Apologies for more than one question in one day but I am really stuck on 
> this one.
>  
> I am working on a chef provisioning script that sets up a subnet and then 
> creates a machine in it.  
>  
> I want to do something like this to tell chef to provision the machine in 
> the subnet it has just created. I need to delay querying the data bag until 
> converge time, but I can't figure out how to do it.  
>  
> with_machine_options :bootstrap_options => {
> :key_name => 'xxxx',
> :instance_type => 't1.micro',
> :subnet => data_bag_item("aws_subnet", "subnet-a")["subnet_id"],  
> :associate_public_ip_address => true
> }
>  
> I have a similar problem later when I need to pass an IP address from one 
> machine to another, and I need the 'attribute' to be evaluated at converge 
> time:
>  
> machine 'db' do
> run_list ['apt','automateinsights::db']
> end
>  
> machine 'appserver' do
> run_list ['automateinsights::deploy_from_package']
> attribute ['automateinsights', 'envconfig', 'db_location'], need db 
> ipaddress here
> end
>  
> Regards,
> Christine

I’m not familiar enough with chef-provisioning to tell you how to get the db 
IP address from EC2 (you could use search if you’re using a Chef Server). For 
lazy evaluation of resource attributes, though, you can use the lazy 
evaluation feature: 
http://docs.chef.io/resource_common.html#lazy-attribute-evaluation

HTH,

--  
Daniel DeLeo