使用Vagrant和Ansible，在Ubuntu16.04上创建Docker环境

2 年 ago

科, 颖

4 minutes

简介

最近非常热门的构建管理工具Ansible，可以在Amazon EC2上搭建Docker环境。

为什么选择Ansible+Docker？

因为本来就想试试两者同时使用的。不过也有一些像是借口般的理由不只用Ansible单独进行。

各サービスに合わせてミドルウェアの整合性合わせてって作業が面倒くさい

实施的内容 (Shí shī de

Dockerの動作確認

使用 AmazonEC2 + Vagrant 进行安装

请参考这边的内容

编写Ansible Playbooks

$ tree
.
├── README.md
├── Vagrantfile
├── docs
│   └── ec2
│       └── setup.md
└── setup
    └── provision
        └── docker.yml

4 directories, 4 files

- hosts: all
  become: yes
  tasks:
    - name: apt-get install packages
      apt: pkg={{ item }} state=present update_cache=yes
      with_items:
        - curl
        - apt-transport-https
        - ca-certificates

    - name: set dockers official gpg key
      apt_key:
          url: "https://download.docker.com/linux/ubuntu/gpg"
          state: present
      register: set_key

    - name: set up the stable repository
      apt_repository:
        repo: deb [arch=amd64] https://download.docker.com/linux/ubuntu {{ ansible_distribution_release }} stable
        state: present
      when: set_key
      register: set_repo

    - name: install docker-ce
      apt: pkg=docker-ce state=present update_cache=yes
      when:  set_repo

修改Vagrantfile

要点有两个

Provisionにansible_localを設定し、サーバでAnsibleのインストール+実行を行う

  Dotenv.load

  Vagrant.configure("2") do |config|
    # Vagrant Box
    config.vm.box = "dummy"

+   # Rsync Directory
+   config.vm.synced_folder "setup", "/vagrant", type: "rsync"

+   # Ansible
+   config.vm.provision "ansible_local" do |ansible|
+     ansible.playbook = "provision/docker.yml"
+   end

    # AWS
    config.vm.provider :aws do |aws, override|
        ## 省略...
    end
  end

确认Docker的操作？

$ vagrant up
Bringing machine 'default' up with 'aws' provider...
==> default: Warning! The AWS provider doesn't support any of the Vagrant
==> default: high-level network configurations (`config.vm.network`). They
==> default: will be silently ignored.
==> default: Launching an instance with the following settings...
==> default:  -- Type: t2.micro
==> default:  -- AMI: ami-c68fc7a1
==> default:  -- Region: ap-northeast-1
==> default:  -- Availability Zone: ap-northeast-1c
==> default:  -- Keypair: default
==> default:  -- Subnet ID: subnet-594ac601
==> default:  -- Elastic IP: true
==> default:  -- User Data: yes
==> default:  -- Security Groups: ["sg-8897d1ef"]
==> default:  -- User Data: sed -i -e 's/^\(Defaults.*requiretty\)/#\1/' /etc/sudoers
==> default:  -- Block Device Mapping: []
==> default:  -- Terminate On Shutdown: false
==> default:  -- Monitoring: false
==> default:  -- EBS optimized: false
==> default:  -- Source Destination check:
==> default:  -- Assigning a public IP address in a VPC: true
==> default:  -- VPC tenancy specification: default
==> default: Waiting for instance to become "ready"...
==> default: Waiting for SSH to become available...
==> default: Machine is booted and ready for use!
==> default: Rsyncing folder: /mnt/c/Users/kazuyoshi/aws-training/setup/ => /vagrant
==> default: Running provisioner: ansible_local...
    default: Installing Ansible...
    default: Running ansible-playbook...

PLAY [all] *********************************************************************

TASK [setup] *******************************************************************
ok: [default]

TASK [apt-get install packages] ************************************************
ok: [default] => (item=[u'curl', u'apt-transport-https', u'ca-certificates'])

TASK [set dockers official gpg key] ********************************************
changed: [default]

TASK [set up the stable repository] ********************************************
changed: [default]

TASK [install docker-ce] *******************************************************
changed: [default]

PLAY RECAP *********************************************************************
default                    : ok=5    changed=3    unreachable=0    failed=0
$ vagrant ssh
Welcome to Ubuntu 16.04.2 LTS (GNU/Linux 4.4.0-64-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

  Get cloud support with Ubuntu Advantage Cloud Guest:
    http://www.ubuntu.com/business/services/cloud

10 packages can be updated.
0 updates are security updates.


$ sudo docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
78445dd45222: Pull complete
Digest: sha256:c5515758d4c5e1e838e9cd307f6c6a0d620b5e07e6f927b07d05f6d12a1ac8d7
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://cloud.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/engine/userguide/

$ exit
logout

感受

如果你想要真正地开始使用Ansible，而不阅读Ansible文档，可能就无法编写出好的Playbooks。
然而，只要不考虑幂等性等因素，你也可以通过使用command或shell命令来移植之前使用shell脚本编写的内容，这样就可以简单地处理。

接下来，可能是先部署Docker服务，然后再考虑将主机服务器进行多元化吧？
作为基础设施服务，建立全面的验证环境还需要一段时间。

请参考以下网站

Ansible Documentation