Class: Beaker::Docker

Inherits:
Hypervisor
  • Object
show all
Defined in:
lib/beaker/hypervisor/docker.rb

Instance Method Summary collapse

Constructor Details

#initialize(hosts, options) ⇒ Docker

Docker hypvervisor initializtion Env variables supported: DOCKER_REGISTRY: Docker registry URL DOCKER_HOST: Remote docker host DOCKER_BUILDARGS: Docker buildargs map

Parameters:

  • hosts (Host, Array<Host>, String, Symbol) —

    One or more hosts to act upon, or a role (String or Symbol) that identifies one or more hosts.

  • options (Hash{Symbol=>String}) —

    Options to pass on to the hypervisor



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# File 'lib/beaker/hypervisor/docker.rb', line 12

def initialize(hosts, options)
  require 'docker'
  @options = options
  @logger = options[:logger] || Beaker::Logger.new
  @hosts = hosts

  # increase the http timeouts as provisioning images can be slow
  default_docker_options = { :write_timeout => 300, :read_timeout => 300 }.merge(::Docker.options || {})
  # Merge docker options from the entry in hosts file
  ::Docker.options = default_docker_options.merge(@options[:docker_options] || {})
  # assert that the docker-api gem can talk to your docker
  # enpoint.  Will raise if there is a version mismatch
  begin
    ::Docker.validate_version!
  rescue Excon::Errors::SocketError => e
    raise "Docker instance not connectable.\nError was: #{e}\nCheck your DOCKER_HOST variable has been set\nIf you are on OSX or Windows, you might not have Docker Machine setup correctly: https://docs.docker.com/machine/\n"
  end

  # Pass on all the logging from docker-api to the beaker logger instance
  ::Docker.logger = @logger

  # Find out what kind of remote instance we are talking against
  if ::Docker.version['Version'] =~ /swarm/
    @docker_type = 'swarm'
    unless ENV['DOCKER_REGISTRY']
      raise "Using Swarm with beaker requires a private registry. Please setup the private registry and set the 'DOCKER_REGISTRY' env var"
    else
      @registry = ENV['DOCKER_REGISTRY']
    end
  else
    @docker_type = 'docker'
  end

end

Instance Method Details

#cleanup ⇒ Object 



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# File 'lib/beaker/hypervisor/docker.rb', line 285

def cleanup
  @logger.notify "Cleaning up docker"
  @hosts.each do |host|
    # leave the container running if docker_preserve_container is set
    # setting docker_preserve_container also implies docker_preserve_image
    # is set, since you can't delete an image that's the base of a running
    # container
    unless host['docker_preserve_container']
      container = find_container(host)
      if container
        @logger.debug("stop container #{container.id}")
        begin
          container.kill
          sleep 2 # avoid a race condition where the root FS can't unmount
        rescue Excon::Errors::ClientError => e
          @logger.warn("stop of container #{container.id} failed: #{e.response.body}")
        end
        @logger.debug("delete container #{container.id}")
        begin
          container.delete
        rescue Excon::Errors::ClientError => e
          @logger.warn("deletion of container #{container.id} failed: #{e.response.body}")
        end
      end

      # Do not remove the image if docker_preserve_image is set to true, otherwise remove it
      unless host['docker_preserve_image']
        image_id = host['docker_image_id']

        if image_id
          @logger.debug("deleting image #{image_id}")
          begin
            ::Docker::Image.remove(image_id)
          rescue Excon::Errors::ClientError => e
            @logger.warn("deletion of image #{image_id} failed: #{e.response.body}")
          rescue ::Docker::Error::DockerError => e
            @logger.warn("deletion of image #{image_id} caused internal Docker error: #{e.message}")
          end
        else
          @logger.warn("Intended to delete the host's docker image, but host['docker_image_id'] was not set")
        end
      end
    end
  end
end

#get_container_image(host) ⇒ Object 



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# File 'lib/beaker/hypervisor/docker.rb', line 73

def get_container_image(host)
  @logger.debug("Creating image")

  if host['use_image_as_is']
    return ::Docker::Image.create('fromImage' => host['image'])
  end

  dockerfile = host['dockerfile']
  if dockerfile
    # assume that the dockerfile is in the repo and tests are running
    # from the root of the repo; maybe add support for external Dockerfiles
    # with external build dependencies later.
    if File.exist?(dockerfile)
      dir = File.expand_path(dockerfile).chomp(dockerfile)
      return ::Docker::Image.build_from_dir(
        dir,
        { 'dockerfile' => dockerfile,
          :rm => true,
          :buildargs => buildargs_for(host)
        }
      )
    else
      raise "Unable to find dockerfile at #{dockerfile}"
    end
  elsif host['use_image_entry_point']
    df = <<-DF
      FROM #{host['image']}
      EXPOSE 22
    DF

    cmd = host['docker_cmd']
    df += cmd if cmd
    return ::Docker::Image.build(df, { rm: true, buildargs: buildargs_for(host) })
  end

  return ::Docker::Image.build(dockerfile_for(host),
              { rm: true, buildargs: buildargs_for(host) })
end

#get_container_opts(host, image_name) ⇒ Object 



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# File 'lib/beaker/hypervisor/docker.rb', line 51

def get_container_opts(host, image_name)
  container_opts = {}
  if host['dockerfile']
    container_opts['ExposedPorts'] = {'22/tcp' => {} }
  end

  container_opts.merge! ( {
    'Image' => image_name,
    'Hostname' => host.name,
    'HostConfig' => {
      'PortBindings' => {
        '22/tcp' => [{ 'HostPort' => rand.to_s[2..5], 'HostIp' => '0.0.0.0'}]
      },
      'PublishAllPorts' => true,
      'Privileged' => true,
      'RestartPolicy' => {
        'Name' => 'always'
      }
    }
  } )
end

#install_and_run_ssh(host) ⇒ Object 



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# File 'lib/beaker/hypervisor/docker.rb', line 47

def install_and_run_ssh(host)
  host['dockerfile'] || host['use_image_entry_point']
end

#install_ssh_components(container, host) ⇒ Object

This sideloads sshd after a container starts



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# File 'lib/beaker/hypervisor/docker.rb', line 242

def install_ssh_components(container, host)
  case host['platform']
  when /ubuntu/, /debian/
    container.exec(%w(apt-get update))
    container.exec(%w(apt-get install -y openssh-server openssh-client))
  when /cumulus/
    container.exec(%w(apt-get update))
    container.exec(%w(apt-get install -y openssh-server openssh-client))
  when /fedora-(2[2-9])/
    container.exec(%w(dnf clean all))
    container.exec(%w(dnf install -y sudo openssh-server openssh-clients))
    container.exec(%w(ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key))
    container.exec(%w(ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key))
  when /^el-/, /centos/, /fedora/, /redhat/, /eos/
    container.exec(%w(yum clean all))
    container.exec(%w(yum install -y sudo openssh-server openssh-clients))
    container.exec(%w(ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key))
    container.exec(%w(ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key))
  when /opensuse/, /sles/
    container.exec(%w(zypper -n in openssh))
    container.exec(%w(ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key))
    container.exec(%w(ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key))
    container.exec(%w(sed -ri 's/^#?UsePAM .*/UsePAM no/' /etc/ssh/sshd_config))
  when /archlinux/
    container.exec(%w(pacman --noconfirm -Sy archlinux-keyring))
    container.exec(%w(pacman --noconfirm -Syu))
    container.exec(%w(pacman -S --noconfirm openssh))
    container.exec(%w(ssh-keygen -A))
    container.exec(%w(sed -ri 's/^#?UsePAM .*/UsePAM no/' /etc/ssh/sshd_config))
    container.exec(%w(systemctl enable sshd))
  when /alpine/
    container.exec(%w(apk add --update openssh))
    container.exec(%w(ssh-keygen -A))
  else
    # TODO add more platform steps here
    raise "platform #{host['platform']} not yet supported on docker"
  end

  # Make sshd directory, set root password
  container.exec(%w(mkdir -p /var/run/sshd))
  container.exec(['/bin/sh', '-c', "echo root:#{root_password} | chpasswd"])
end

#provision ⇒ Object 



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# File 'lib/beaker/hypervisor/docker.rb', line 112

def provision
  @logger.notify "Provisioning docker"

  @hosts.each do |host|
    @logger.notify "provisioning #{host.name}"


    image = get_container_image(host)

    if host['tag']
      image.tag({:repo => host['tag']})
    end

    if @docker_type == 'swarm'
      image_name = "#{@registry}/beaker/#{image.id}"
      ret = ::Docker::Image.search(:term => image_name)
      if ret.first.nil?
        @logger.debug("Image does not exist on registry. Pushing.")
        image.tag({:repo => image_name, :force => true})
        image.push
      end
    else
      image_name = image.id
    end

    container_opts = get_container_opts(host, image_name)
    if host['dockeropts'] || @options[:dockeropts]
      dockeropts = host['dockeropts'] ? host['dockeropts'] : @options[:dockeropts]
      dockeropts.each do |k,v|
        container_opts[k] = v
      end
    end

    container = find_container(host)

    # Provisioning - Only provision if the host's container can't be found
    # via its name or ID
    if container.nil?
      unless host['mount_folders'].nil?
        container_opts['HostConfig'] ||= {}
        container_opts['HostConfig']['Binds'] = host['mount_folders'].values.map do |mount|
          host_path = File.expand_path(mount['host_path'])
          # When using docker_toolbox and getting a "(Driveletter):/" path, convert windows path to VM mount
          if ENV['DOCKER_TOOLBOX_INSTALL_PATH'] && host_path =~ /^.\:\//
            host_path = "/" + host_path.gsub(/^.\:/, host_path[/^(.)/].downcase)
          end
          a = [ host_path, mount['container_path'] ]
          a << mount['opts'] if mount.has_key?('opts')
          a.join(':')
        end
      end

      if host['docker_env']
        container_opts['Env'] = host['docker_env']
      end

      if host['docker_cap_add']
        container_opts['HostConfig']['CapAdd'] = host['docker_cap_add']
      end

      if host['docker_container_name']
        container_opts['name'] = host['docker_container_name']
      end

      @logger.debug("Creating container from image #{image_name}")
      container = ::Docker::Container.create(container_opts)
    else
      host['use_existing_container'] = true
    end

    if container.nil?
      raise RuntimeError, 'Cannot continue because no existing container ' +
                          'could be found and provisioning is disabled.'
    end

    fix_ssh(container) if @options[:provision] == false

    @logger.debug("Starting container #{container.id}")
    container.start

    if install_and_run_ssh(host)
      @logger.notify("Installing ssh components and starting ssh daemon in #{host} container")
      install_ssh_components(container, host)
      # run fixssh to configure and start the ssh service
      fix_ssh(container, host)
    end
    # Find out where the ssh port is from the container
    # When running on swarm DOCKER_HOST points to the swarm manager so we have to get the
    # IP of the swarm slave via the container data
    # When we are talking to a normal docker instance DOCKER_HOST can point to a remote docker instance.

    # Talking against a remote docker host which is a normal docker host
    if @docker_type == 'docker' && ENV['DOCKER_HOST']
      ip = URI.parse(ENV['DOCKER_HOST']).host
    else
      # Swarm or local docker host
      if in_container?
        ip = container.json["NetworkSettings"]["Gateway"]
      else
        ip = container.json["NetworkSettings"]["Ports"]["22/tcp"][0]["HostIp"]
      end
    end

    @logger.info("Using docker server at #{ip}")
    port = container.json["NetworkSettings"]["Ports"]["22/tcp"][0]["HostPort"]

    forward_ssh_agent = @options[:forward_ssh_agent] || false

    # Update host metadata
    host['ip']  = ip
    host['port'] = port
    host['ssh']  = {
      :password => root_password,
      :port => port,
      :forward_agent => forward_ssh_agent,
      :auth_methods => ['password', 'publickey', 'hostbased', 'keyboard-interactive']
    }

    @logger.debug("node available as  ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no root@#{ip} -p #{port}")
    host['docker_container_id'] = container.id
    host['docker_image_id'] = image.id
    host['vm_ip'] = container.json["NetworkSettings"]["IPAddress"].to_s

  end

  hack_etc_hosts @hosts, @options

end