I've been trying to use the user-data provided by EC2 servers to determine
a servers hostname.
So currently new server come up with a hostname of "ec2-123-234-345-456" or
similar, and I'd like in my ansible script to rename that server to
something like "demonstration".
To do this, I've gone into my EC2 console, and added the following as
user-data to my server:
{"hostname": "demonstration"}
Then, in my ansible playbook, I've tried the following:
- name: Load user data
uri: url=http://169.254.169.254/latest/user-data return_content=yes
register: user_data
- debug: var=user_data.content
- name: Set hostname from user data
command: hostname {{user_data.content.hostname}}
when: user_data is defined
This produces the output (using the -v flag):
PLAY [ec2]
********************************************************************
GATHERING FACTS
***************************************************************
ok: [ec2-54-253-114-###.ap-southeast-2.compute.amazonaws.com]
TASK: [common | Load user data]
***********************************************
ok: [ec2-54-253-114-###.ap-southeast-2.compute.amazonaws.com] =>
{"accept_ranges": "bytes", "changed": false, "connection": "close",
"content": "{\"hostname\":\"demonstration\"}", "content_length": "28",
"content_location": "http://169.254.169.254/latest/user-data";,
"content_type": "application/octet-stream", "date": "Fri, 14 Mar 2014
00:30:30 GMT", "etag": "\"1016948274\"", "item": "", "last_modified": "Thu,
13 Mar 2014 22:02:44 GMT", "redirected": false, "server": "EC2ws",
"status": 200}
TASK: [common | debug var=user_data.content]
**********************************
ok: [ec2-54-253-114-###.ap-southeast-2.compute.amazonaws.com] => {
"item": "",
"user_data.content": {
"hostname": "demonstration"
}
}
TASK: [common | Set hostname from user data]
**********************************
fatal: [ec2-54-253-114-###.ap-southeast-2.compute.amazonaws.com] => One
or more undefined variables: 'unicode object' has no attribute 'hostname'
So, whilst it seems that debugging user_data returns a JSON-like return
strucutre, and drilling down to user_data.content also returns a JSON-like
return structure, the actual JSON content returned by the uri task is
unable to be parsed using the Jinja2 dot notation, and instead appears to
be an impenetrable object, at least as far as I can determine.
Is there a way of extracting this URI return content using core ansible
modules such that I can use it's JSON payload as ansible variables ?
Regards,
Ben
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