Exporting a Template

To illustrate exporting a template, let’s start from scratch. We will create a template, get the ID and export it with hammr.

So first lets create a new template with the JSON file centoscore-template.json.

{
  "stack" : {
    "name" : "CentOS Core",
    "version" : "6.4",
    "os" : {
      "name" : "CentOS",
      "version" : "6.4",
      "arch" : "x86_64"
      "profile" : "Minimal"
    },
    "config" : [ {
      "name" : "firstboot1.sh",
      "source" : "http://myconfig.site.com/config/firstboot1.sh",
      "type" : "bootscript",
      "frequency" : "firstboot"
    }, {
      "name" : "firstboot0.sh",
      "source" : "http://myconfig.site.com/config/firstboot1.sh",
      "type" : "bootscript",
      "frequency" : "firstboot"
    } ]
  }
}

$ hammr template create --file centoscore-template.json

Now that the template is created we need to get the Id of the template you want to export. To do so, list the templates with the command template list:

$ hammr template list
+-----+------------------------------+---------+---------------------+---------------------+---------------------+--------+---------+-----+--------+
| Id  |             Name             | Version |         OS          |       Created       |    Last modified    | # Imgs | Updates | Imp | Shared |
+=====+==============================+=========+=====================+=====================+=====================+========+=========+=====+========+
| 669 | CentOS Core                  | 1.0     | CentOS 6.4 x86_64   | 2014-04-25 13:55:19 | 2014-05-09 13:24:59 | 0      | 0       |     |        |
+-----+------------------------------+---------+---------------------+---------------------+---------------------+--------+---------+-----+--------+

In this case the Id is 669. To export the template, run the command template export:

$ hammr template export --id 669 --file /tmp/centos-core-archive.tar.gz
Exporting template with id [669] :
100%|#################################################################################|
Downloading archive...
OK: Download complete of file [/tmp/centos-core-archive.tar.gz]

Now if you uncompress the archive, you will find a file template.json, which is the template JSON configuration file and a sub-directory config containing the two boot scripts.

If you open the template.json file, then you will notice that there is additional information added, including:

• pkgs: this contains all the packages that are added by the os profile Minimal
• updateTo: this is the date that the template initially created. This ensure that if you re-import this template (the creation date might be different) and build a machine image, the machine image will be identical to any machine image built from the original template
• installation: adds the default installation parameters.