vagrant - Packer 使用默认变量？

Question

我一直在尝试找出在打包程序中使用选项变量的可能性，我的脚本如下:

"provisioners": [{
  "type": "shell",
  "scripts": [
    "scripts/centos/5.11/puppet-{{user `config`}}.sh",
  ]
}],
"variables": {
  "config": "{{user `type`}} | slave",
} 

一个典型的命令是:

packer build              \
    -var 'config=master'  \
    template.json

但也可以做到以下几点:

packer build template.json # were config would default to slave

Answer 1

命令行变量会覆盖 json 模板中的设置。请参阅 Packer 的文档:https://www.packer.io/docs/templates/user-variables.html

所以只需在模板中设置默认值，然后用您已经使用的命令行示例覆盖即可。

你的模板是:

"provisioners": [{
   "type": "shell",
   "scripts": [
      "scripts/centos/5.11/puppet-{{user `config`}}.sh"
   ]
}],
"variables": {
  "config": "slave"
}