在 OS X 上安装红帽容器开发工具包

什么 Red Hat CDK?

CDK 是 Container Development Kit（容器开发包）的缩写，它能让开发者在他们的桌面系统上使用 Red Hat Atomic，不管他们所使用的是 Microsoft Windows®，Mac OS X® 或者其他 Linux 的发行版。同boot2docker类似，CDK利用虚拟机来启动一个小的主机，它能运行基于 Red Hat Enterprise Linux 的容器。

前置条件

• Red Hat 订阅 - 要安装 Red Hat CDK 你就得拥有一个激活了的 Red Hat Enterprise Linux 订阅, 如果没有，可以在 这里 进行申请和查看。

• 虚拟环境 - VirtualBox (Mac/Windows) 或者 virt-manager (Linux)

• Vagrant - 用来创建和管理虚拟环境。

从 Red Hat 消费者门户 下载下面这些东西。

1. Red Hat 容器工具（Container Tools）

2. 面向 VirtualBox  的 Red Hat Atomic Vagrant 盒子 或者 面向libvirt 的 Red Hat Atomic Vagrant 盒子。

安装 Red Hat 容器开发包

注意：在这之前你需要安装好虚拟化环境以及 Vagrant

解压你下载的 cdk.zip 文件到主目录. 这样会创建 ~/cdk (/Users/username/cdk)

$ unzip -d $HOME ~/Downloads/cdk-1.0-0.zip

安装使用 Red Hat Vagrant 所需要的 Vagrant 插件. 第一个插件会花几分钟时间，Vagrant 可能会需要安装一些额外的gem文件。

$ cd ~/cdk/plugins $ vagrant plugin install vagrant-registration-0.0.8.gem $ vagrant plugin install vagrant-atomic-0.0.3.gem

验证插件是否已经安装好了：

$ vagrant plugin list vagrant-atomic (0.0.3)   - Version Constraint: 0.0.3 vagrant-registration (0.0.8)  - Version Constraint: 0.0.8

将 RHEL Atomic 盒子添加到 Vagrant：

$ vagrant box add --name rhel-atomic-7 ~/Downloads/rhel-atomic-virtualbox-7.1-0.x86_64.box

启动 Atomic 主机

为 docker 文件创建一个工作目录

$ mkdir ~/containers && cd ~/containers

为容器创建一个工作目录，并初始化 vagrant

$ mkdir containers && cd containers $ vagrant init -m A `Vagrantfile` has been placed in this directory. You are now ready to `vagrant up` your first virtual environment! Please read the comments in the Vagrantfile as well as documentation on `vagrantup.com` for more information on using Vagrant.

这一步会创建一个简单的 Vagrant 文件。打开它并像下面这样修改配置：

Vagrant.configure(2) do |config|   config.vm.box = "rhel-atomic-7"   config.vm.hostname = "rhel-atomic-7-docker-host"    config.vm.provider "virtualbox" do |vb|     vb.customize ["modifyvm", :id, "--cpuexecutioncap", "50"]     vb.memory = 4096   end    config.vm.provision "shell", inline: <<-SHELL     sudo systemctl stop docker > /dev/null 2>&1     sudo groupadd docker > /dev/null 2>&1     sudo usermod -a -G docker vagrant     sudo systemctl enable docker && sudo systemctl start docker     sudo chown root:docker /var/run/docker.sock     sudo systemctl enable docker && sudo systemctl start docker   SHELL end

我们现在已经做好了启动容器的准备。在机器的创建过程中，你将会看到是否想要注册系统的提示。回答 "Y" 就会要你输入RHN (Red Hat Network) 账户的用户名和密码.

$ vagrant up Bringing machine 'default' up with 'virtualbox' provider... ==> default: Importing base box 'rhel-atomic-7'... ==> default: Matching MAC address for NAT networking... ==> default: Setting the name of the VM: containers_default_1432213616739_95846 ==> default: Clearing any previously set network interfaces... ==> default: Preparing network interfaces based on configuration...  default: Adapter 1: nat ==> default: Forwarding ports...  default: 22 => 2222 (adapter 1) ==> default: Running 'pre-boot' VM customizations... ==> default: Booting VM... ==> default: Waiting for machine to boot. This may take a few minutes...  default: SSH address: 127.0.0.1:2222  default: SSH username: vagrant  default: SSH auth method: private key  default: Warning: Connection timeout. Retrying...  default:   default: Vagrant insecure key detected. Vagrant will automatically replace  default: this with a newly generated keypair for better security.  default:   default: Inserting generated public key within guest...  default: Removing insecure key from the guest if its present...  default: Key inserted! Disconnecting and reconnecting using new SSH key... ==> default: Machine booted and ready! ==> default: Checking for guest additions in VM...  default: No guest additions were detected on the base box for this VM! Guest  default: additions are required for forwarded ports, shared folders, host only  default: networking, and more. If SSH fails on this machine, please install  default: the guest additions and repackage the box to continue.  default:   default: This is not an error message; everything may continue to work properly,  default: in which case you may ignore this message. ==> default: Setting hostname... ==> default: Registering box with vagrant-registration...  default: Would you like to register the system now (default: yes)? [y|n] y  default: Subscriber username: <your-rhn-username>  default: Subscriber password: <password>==> default: Rsyncing folder: /Users/tqvarnst/containers/ => /home/vagrant/sync ==> default: Running provisioner: shell...  default: Running: inline script 

测试你的安装

$ vagrant ssh [vagrant@rhel-atomic-7-docker-host ~]$ docker ps CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES [vagrant@rhel-atomic-7-docker-host ~]$ docker run -it rhel7.1 bash Unable to find image 'rhel7.1:latest' locally Pulling repository registry.access.redhat.com/rhel7.1 10acc31def5d: Download complete  Status: Downloaded newer image for registry.access.redhat.com/rhel7.1:latest [root@ead3774c2b84 /]# cat /etc/redhat-release  Red Hat Enterprise Linux Server release 7.1 (Maipo) [root@ead3774c2b84 /]#

按下 CTRL-P + CTRL-Q 可以离开你的容器

[vagrant@rhel-atomic-7-docker-host ~]$ docker ps CONTAINER ID        IMAGE                                      COMMAND             CREATED              STATUS              PORTS               NAMES ead3774c2b84        registry.access.redhat.com/rhel7.1:7.1-4   "bash"              About a minute ago   Up About a minute                       focused_rosalind

如下命令可以停掉或者删除容器

[vagrant@rhel-atomic-7-docker-host ~]$ docker stop $(docker ps -q) ead3774c2b84 [vagrant@rhel-atomic-7-docker-host ~]$ docker rm $(docker ps -aq) ead3774c2b84

总结

通过这个指南，你就可以有一个可以来使用基于 Red Hat Enterprise Linux 7.1 的容器的工作环境，不管你使用的是 Mac OS X®，Microsoft Windows® 还是其它的Linux发行版。

鸣谢

特别要感谢 Pete Muir 在Vagrant设置上给我带来的支持和帮助。