如何使用Packer Salt Provisioner创建Docker图像

Question

如何使用Packer Salt Provisioner创建Docker Images？

这是我的packer.json文件。我将在下面评论内联

{
  "builders": [
    {
      "type": "docker",
      "image": "enonic/docker-salt-masterless-ubuntu",
      "export_path": "cassandra.tar" // Not sure what this is doing?
    }
  ],
  "provisioners": [
    {
      "type": "file",
      "source": "/srv/salt/cassandra", // This is where the cassandra directory is on my host machine which is ubuntu
      "destination": "/srv/salt/cassandra" // This is where I expect the cassandra directory on my host machine gets copied to inside a docker container
    },
    {
      "type": "salt-masterless",
      "local_state_tree": "/srv/salt/cassandra",
      "custom_state": "/srv/salt/cassandra/init.sls",
      "disable_sudo": true
    }
  ]
}

sudo docker build packer.json

我得到以下错误

Build 'docker' errored: Failed to upload to '/srv/salt/cassandra' in container: Error response from daemon: lstat /var/lib/docker/aufs/mnt/0c6a422400a073624a66b00580a6b9e5551e82a06495c46b1f840b38ca55699d/srv/salt: no such file or directory
. exit status 1.
==> Some builds didn't complete successfully and had errors:
--> docker: Failed to upload to '/srv/salt/cassandra' in container: Error response from daemon: lstat /var/lib/docker/aufs/mnt/0c6a422400a073624a66b00580a6b9e5551e82a06495c46b1f840b38ca55699d/srv/salt: no such file or directory

，如果我能获得一个简单的工作示例，那就是如何使用盐状态机器中的盐状态文件并使用Packer构建Docker Image，那就太好了。我的Cassandra状态文件与https://github.com/salt-formulas/salt-formula-cassandra

我的top.sls文件看起来像

base:
  'client*-es-*':
    - roles-elasticsearch
  'client*-cassandra-*':
    - roles-cassandra

  'P@os:(Debian|Ubuntu) and P@roles:(elasticsearch|cassandra)':
    - match: compound
    - deb-common
  'roles:elasticsearch':
    - match: grain
    - disk-raid0-3volumes
    - disk-elasticsearch
    - elasticsearch
    - elasticsearch.cerebro
  'roles:cassandra':
    - match: grain
    - disk-raid0-3volumes
    - disk-cassandra
    - cassandra

我只想仅为Cassandra构建Docker容器映像，而不是为top.sls中的所有内容。那我该怎么做？

Answer 1

我调整了您的示例更简单，只需安装apache 2。

shell供应商只是因为我不知道盐，而din不花任何时间在howto做apt-get update上。

首先，基本图像已经安装了盐，因此请使用skip_bootstrap。您不应该将状态目录上传到来宾（Docker容器），因为这是自动完成的，所有这些都是在文档包装器中 - 无盐。local_state_tree应指向盐状态树的底部。/srv/salt在您的情况下。

一个工作示例：

tree

.
├── salt
│   ├── apache
│   │   └── init.sls
│   └── top.sls
└── template.json

template.json

{
  "builders": [
    {
      "type": "docker",
      "image": "enonic/docker-salt-masterless-ubuntu",
      "export_path": "apache2.tar"
    }
  ],
  "provisioners": [
    {
      "type": "shell",
      "inline": [
        "apt-get update"
      ]
    },
    {
      "type": "salt-masterless",
      "local_state_tree": "salt",
      "skip_bootstrap": true,
      "disable_sudo": true
    }
  ]
}

top.sls

base:
  '*':
    - apache

apache/init.sls

apache2:
  pkg.installed: []
  service.running:
    - require:
      - pkg: apache2

Answer 2

您需要将local_state_path更改为/srv/salt。