Vagrant：使用 vagrant 将 docker run 参数传递给多个容器

Question

出于研究目的，我正在使用 vagrant 部署一个多 VM 环境，到目前为止效果很好。但现在我需要将每个 docker 容器固定到特定的 CPU 核心，但我不知道如何使用 vagrant 来做到这一点。我知道我可以使用 Vagrantfile 上的“args”子句将“--cpuset”参数传递给 docker run 命令，但我不知道如何在循环中使用它，因为我正在启动多个容器和我需要将每个容器固定到不同的 CPU 核心（例如，node1 引脚连接到核心 #0，node2 引脚连接到核心 #1，等等）。

我目前的 Vagrantfile 如下，没有 CPU Pinning 的东西：

# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
VAGRANTFILE_API_VERSION = "2"

# choose how many machines the cluster will contain
N_VMS = 32

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
  config.vm.box = "tknerr/baseimage-ubuntu-14.04"
  config.vm.network "private_network", ip: "192.168.121.2"
  config.vm.provider "docker" do |v|
    v.has_ssh = true
  end

  hosts_file = []
  1.upto(N_VMS) do |i|
    config.vm.define vm_name = "node#{i}" do |config|
      config.vm.hostname = vm_name
    end
  end

  script = <<-SCRIPT
      apt-get -y update
      apt-get -y install libcr-dev mpich2 mpich2-doc arp-scan openssh-server nano make
  SCRIPT
  script.sub! 'N_VMS', N_VMS.to_s
  config.vm.provision "shell", inline: script

end

Answer 1

最后，我找错地方了。添加“--cpuset-cpus”的正确位置是在 config.vm.define 块中。

代码是这样结束的：

# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
VAGRANTFILE_API_VERSION = "2"

# choose how many machines the cluster will contain
N_VMS = 32

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
  config.vm.box = "tknerr/baseimage-ubuntu-14.04"
  config.vm.network "private_network", ip: "192.168.121.2"
  config.vm.provider "docker" do |v|
    v.has_ssh = true
  end

  2.upto(N_VMS+1) do |i|
    config.vm.define vm_name = "node#{i}" do |config|

      # CPU PINNING CONFIG    
      config.vm.provider "docker" do |docker|
        docker.create_args = ['--cpuset-cpus=' + ((i/2)-1).to_s]
      end

      config.vm.hostname = vm_name
    end
  end

  script = <<-SCRIPT
      apt-get -y update
      apt-get -y install libcr-dev mpich2 mpich2-doc arp-scan openssh-server nano make
  SCRIPT
  script.sub! 'N_VMS', N_VMS.to_s
  i=1
  config.vm.provision "shell", inline: script

end

Answer 2

假设你想在循环中配置 vagrant vm，因为 vagrantfile 是基于 ruby​​ 语言的，所以你可以将开发可用性加入到 vagrantfile 中，这里是一个例子，你可以添加你的“--cpuset”在 vm 定义中配置。

# -*- mode: ruby -*-
# vi: set ft=ruby :
# read vm and chef configurations from JSON files
nodes_config = (JSON.parse(File.read("nodes.json")))['nodes']
VAGRANTFILE_API_VERSION = "2"
Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
    nodes_config.each do |node|
    node_name   = node[0] # name of node
    node_values = node[1] # content of node
            # puts node_name
    # puts node_values['box']
    config.vm.define node_name do |config|
        config.vm.box = node_values['box']
        config.vm.hostname = node_name
        config.vm.network :private_network, ip: node_values['ip']
                    config.vm.provider :virtualbox do |vb|
            vb.customize ["modifyvm", :id, "--memory", node_values['memory']]
            vb.customize ["modifyvm", :id, "--name", node_name]
        end
    end 
end

nodes.json来定义vm，你可以定义你的

{
  "nodes": {
    "jenkins.example.com": {
      "info": "jenkins master server",
      "box": "../Vgrant-boxes/centos65_virtualbox_50G.box",
      "ip": "192.168.35.101",
      "ports": [],
      "memory": 512
    },
    "node01.example.com": {
      "info": "tomcat app host server",
      "box": "../Vgrant-boxes/centos65_virtualbox_50G.box",
      "ip": "192.168.35.121",
      "ports": [],
      "memory": 512
    },
    "node02.example.com": {
      "info": "jboss app host server",
      "box": "../Vgrant-boxes/centos65_virtualbox_50G.box",
      "ip": "192.168.35.122",
      "ports": [],
      "memory": 512
    },
    "node03.example.com": {
      "info": "oracle xe server",
      "box": "../Vgrant-boxes/centos65_virtualbox_50G.box",
      "ip": "192.168.35.123",
      "ports": [],
      "memory": 512
    },
    "node04.example.com": {
      "info": "artifactory server",
      "box": "../Vgrant-boxes/centos65_virtualbox_50G.box",
      "ip": "192.168.35.124",
      "ports": [],
      "memory": 512
    }
  }
}