Class: Fig2CoreOS

Inherits:
Object
  • Object
show all
Defined in:
lib/fig2coreos.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app_name, fig_file, output_dir, options = {}) ⇒ Fig2CoreOS

Returns a new instance of Fig2CoreOS.



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# File 'lib/fig2coreos.rb', line 12

def initialize(app_name, fig_file, output_dir, options={})
  @app_name = app_name
  @fig = YAML.load_file(fig_file.to_s)
  @output_dir = File.expand_path(output_dir.to_s)
  @vagrant = (options[:type] == "vagrant")

  # clean and setup directory structure
  FileUtils.rm_rf(Dir[File.join(@output_dir, "*.service")])
  FileUtils.rm_rf(File.join(@output_dir, "media"))
  FileUtils.rm_rf(File.join(@output_dir, "setup-coreos.sh"))
  FileUtils.rm_rf(File.join(@output_dir, "Vagrantfile"))
  
  if @vagrant
      FileUtils.mkdir_p(File.join(@output_dir, "media", "state", "units"))
      create_vagrant_file
  end
  
  create_service_files
  exit 0
end

Class Method Details

.convert(app_name, fig_file, output_dir, options = {}) ⇒ Object 



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# File 'lib/fig2coreos.rb', line 8

def self.convert(app_name, fig_file, output_dir, options={})
  Fig2CoreOS.new(app_name, fig_file, output_dir, options)
end

Instance Method Details

#create_service_files ⇒ Object 



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# File 'lib/fig2coreos.rb', line 33

def create_service_files
  @fig.each do |service_name, service|
    image = service["image"]
    ports = (service["ports"] || []).map{|port| "-p #{port}"}
    volumes = (service["volumes"] || []).map{|volume| "-v #{volume}"}
    links = (service["links"] || []).map{|link| "--link #{link}_1:#{link}_1"}
    envs = (service["environment"] || []).map do |env_name, env_value|
      "-e \"#{env_name}=#{env_value}\""
    end

    after = if service["links"]
      "#{service["links"].last}.1"
    else
      "docker"
    end

    if @vagrant
      base_path = File.join(@output_dir, "media", "state", "units")
    else
      base_path = @output_dir
    end

    File.open(File.join(base_path, "#{service_name}.1.service") , "w") do |file|
      file << "[Unit]\nDescription=Run \#{service_name}_1\nAfter=\#{after}.service\nRequires=\#{after}.service\n\n[Service]\nRestart=always\nRestartSec=10s\nExecStartPre=/usr/bin/docker ps -a -q | xargs docker rm\nExecStart=/usr/bin/docker run -rm -name \#{service_name}_1 \#{volumes.join(\" \")} \#{links.join(\" \")} \#{envs.join(\" \")} \#{ports.join(\" \")} \#{image}\nExecStartPost=/usr/bin/docker ps -a -q | xargs docker rm\nExecStop=/usr/bin/docker kill \#{service_name}_1\nExecStopPost=/usr/bin/docker ps -a -q | xargs docker rm\n\n[Install]\nWantedBy=local.target\n"
    end

    File.open(File.join(base_path, "#{service_name}-discovery.1.service"), "w") do |file|
      file << "[Unit]\nDescription=Announce \#{service_name}_1\nBindsTo=\#{service_name}.1.service\n\n[Service]\nExecStart=/bin/sh -c \"while true; do etcdctl set /services/\#{service_name}/\#{service_name}_1 '{ \\\\\"host\\\\\": \\\\\"%H\\\\\", \\\\\"port\\\\\": \#{service[\"ports\"].first.to_s.split(\":\").first}, \\\\\"version\\\\\": \\\\\"52c7248a14\\\\\" }' --ttl 60;sleep 45;done\"\nExecStop=/usr/bin/etcdctl rm /services/\#{service_name}/\#{service_name}_1\n\n[X-Fleet]\nX-ConditionMachineOf=\#{service_name}.1.service\n"
    end
  end
end

#create_vagrant_file ⇒ Object 



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# File 'lib/fig2coreos.rb', line 93

def create_vagrant_file
  File.open(File.join(@output_dir, "setup-coreos.sh"), "w") do |file|
    file << "# Switch to root for setting up systemd\nsudo -i\n\n# Clear old containers\nsystemctl stop local-enable.service\nsystemctl stop etcd-cluster.service\n/usr/bin/docker ps -a -q | xargs docker kill\n/usr/bin/docker ps -a -q | xargs docker rm\n\n# Copy the services into place\n"
    @fig.each do |service_name, service|
      file << "cp " + File.join("share", "media", "state", "units", "#{service_name}.1.service") + " /media/state/units/#{service_name}.1.service\n"
      file << "cp " + File.join("share", "media", "state", "units", "#{service_name}-discovery.1.service") + " /media/state/units/#{service_name}-discovery.1.service\n\n"
    end

    file << "\n# Fix etcd-cluster setup\nHOSTNAME=$(</proc/sys/kernel/hostname)\n\nif [ ! -d /var/run/etcd/${HOSTNAME} ]\nthen\nmkdir /var/run/etcd/${HOSTNAME}\nchown core:core /var/run/etcd/${HOSTNAME}\nfi\n\necho 192.168.10.2 > /var/run/etcd/MY_IP\n\n# Replace the existing line:\nsed -i -e \"s@ExecStart=.*@ExecStart=/usr/bin/etcd -s 192.168.10.2:7001 -sl 0.0.0.0 -cl 0.0.0.0 -c 192.168.10.2:4001 ${CLUSTER_OPT} -d /var/run/etcd/${HOSTNAME} -n $HOSTNAME@\" /media/state/units/etcd-cluster.service\n\n# Start containers and fleet\nsystemctl daemon-reload\nsystemctl start etcd-cluster.service\nsystemctl start local-enable.service\nsystemctl start fleet\n\netcdctl mkdir /services\n"
    @fig.each do |service_name, service|
      file << "etcdctl mkdir /services/#{service_name}\n"
    end
    file << "cd /media/state/units; for service in *.service; do fleetctl start $service; done\n"
    file << "sleep 3; /usr/bin/docker ps -a -q | xargs docker rm\n"
    file << "sleep 3; /usr/bin/docker ps -a -q | xargs docker rm\n"
    file << "echo 'SUCCESS'\n"
    file << "exit 0\n"

    file.chmod(0755)
  end

  File.open(File.join(@output_dir, "Vagrantfile"), "w") do |file|
    file << "# -*- mode: ruby -*-\n# vi: set ft=ruby :\n\n$expose_port = 8080\n\nVagrant.configure(\"2\") do |config|\nconfig.vm.box = \"coreos\"\nconfig.vm.box_url = \"http://storage.core-os.net/coreos/amd64-generic/dev-channel/coreos_production_vagrant.box\"\nconfig.vm.hostname = \"coreos-\#{@app_name}\"\n\nconfig.vm.provider :virtualbox do |vb, override|\n  vb.name = \"vagrant-coreos-docker-converted-from-fig-\#{@app_name}\"\n  # Fix docker not being able to resolve private registry in VirtualBox\n  vb.customize [\"modifyvm\", :id, \"--natdnshostresolver1\", \"on\"]\n  vb.customize [\"modifyvm\", :id, \"--natdnsproxy1\", \"on\"]\nend\n\n# Share this folder so provisioner can access Dockerfile an apache.service\n# This is from coreos/coreos-vagrant, but won't work on Windows hosts\nconfig.vm.network \"private_network\", ip: \"192.168.10.2\"\nconfig.vm.synced_folder \".\", \"/home/core/share\", id: \"core\", :nfs => true,  :mount_options   => ['nolock,vers=3,udp']\n\n# Forward port 80 from coreos (which is forwarding port 80 of the container)\nconfig.vm.network :forwarded_port, guest: 80, host: $expose_port, host_ip: \"127.0.0.1\"\n\nconfig.vm.provider :vmware_fusion do |vb, override|\n  override.vm.box_url = \"http://storage.core-os.net/coreos/amd64-generic/dev-channel/coreos_production_vagrant_vmware_fusion.box\"\nend\n\n# plugin conflict\nif Vagrant.has_plugin?(\"vagrant-vbguest\") then\n  config.vbguest.auto_update = false\nend\n\n# Provision\nconfig.vm.provision \"shell\", :path => \"setup-coreos.sh\"\nend\n"
  end

  if File.directory?(File.join(@output_dir, ".vagrant"))
    puts "[SUCCESS] Try this: cd #{@output_dir} && vagrant reload --provision"
  else
    puts "[SUCCESS] Try this: cd #{@output_dir} && vagrant up"
  end
end