Hi Ben, If you want to access the JSON data it's available in the json
subkey. So instead of:
{{ user_data.content.hostname }}
I believe it would be
{{ user_data.json.hostname }}
or something similar.
Take a look at the {{ user_data.json }} or {{ user_data }} output with
the debug module to get a better idea.
Hope that helps,
Romeo
On Thu, Mar 13, 2014 at 2:35 PM, Ben Turner <[email protected]> wrote:
> 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
>
> --
> You received this message because you are subscribed to the Google Groups
> "Ansible Project" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to [email protected].
> To post to this group, send email to [email protected].
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/ansible-project/978e1838-7964-4130-827f-2f82c0daa4f8%40googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
--
Romeo
--
You received this message because you are subscribed to the Google Groups
"Ansible Project" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/ansible-project/CACUx58M%3D361LMPj4DFDjTrZQ0nNT57c32zLfKBm4HNupuxVtvQ%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.
