Reusing the state of a failed provisioned system

[tushar mathur]

Hi,

I am trying to provision my ami using a set of custom shell scripts. Sadly every time they fail I have to recreate an ec2 instance from scratch. This makes sense when I am deploying in production but at the time of debugging and trying out different commands it becomes really slow. 

Is there a way for me to actually reuse the state in which ec2 instance is currently and keep running the provisioners again and again?

I tried the --on-error argument but that only runs on the last failed step where as what I really want is to run the provisioning again from scratch.

packer build --debug  -on-error=ask packer-aws.json

Thanks!

[Rickard von Essen]

Usually I add a null builder to the template. Then you can either A) add a inline "sleep 3600" start a build with "packer build -only amazon-ebs template.json". And when it pauses the provisioning in another terminal run "packer build -only null -var debug_ip=IP -var private_key... template.json" and iterate over your provisioning scripts quickly. Or B) just launch a EC2 instance manually and run the null builder against that.

{

    "variables": {

        "debug_ip": "",

        "private_key": "",

        "keypair": ""

    },

    "builders": [

        {

            "type": "amazon-ebs",

       [...]

        },

        {

            "type": "null",

            "ssh_host": "{{ user `debug_ip`}}",

            "ssh_username": "{{ user `username`}}",

            "ssh_private_key_file": "{{ user `private_key`}}"

        }

    ],

}

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[tush]

Thanks a ton Rickard. This has been really helpful!

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Regards,

Tushar Mathur.

www.tusharm.com