Class: Kytoon::Providers::Libvirt::ServerGroup

Inherits:
Object
  • Object
show all
Defined in:
lib/kytoon/providers/libvirt/server_group.rb

Overview

2) Generate an ssh keypair to be injected into the image.

Constant Summary collapse

KIB_PER_GIG = 
1048576
CONFIG_FILE = 
KYTOON_PROJECT + File::SEPARATOR + "config" + File::SEPARATOR + "server_group.json"
@@data_dir = 
File.join(KYTOON_PROJECT, "tmp", "libvirt")

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ ServerGroup

Returns a new instance of ServerGroup.



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 39

def initialize(options={})
@id = options[:id] || Time.now.to_f
@name = options[:name]
@use_sudo = options[:use_sudo]
@servers=[]
end

Instance Attribute Details

#id ⇒ Object

Returns the value of attribute id.



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 35

def id
  @id
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 36

def name
  @name
end

#use_sudo ⇒ Object

Returns the value of attribute use_sudo.



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 37

def use_sudo
  @use_sudo
end

Class Method Details

.cleanup_instances(group_id, inst_name, disk_path, sudo) ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 390

def self.cleanup_instances(group_id, inst_name, disk_path, sudo)
  domain_name="#{group_id}_#{inst_name}"
  out = %x{
if [ -n "$DEBUG" ]; then
set -x
fi
export VIRSH_DEFAULT_CONNECT_URI="qemu:///system"
if #{sudo} virsh dumpxml #{domain_name} &> /dev/null; then
#{sudo} virsh destroy "#{domain_name}" &> /dev/null
#{sudo} virsh undefine "#{domain_name}"
fi
# If we used --preserve-data there will be no volume... ignore it
#{sudo} virsh vol-delete --pool default "#{group_id}_#{inst_name}.img" &> /dev/null
if [ -f "#{disk_path}" ]; then
#{sudo} rm -f "#{disk_path}"
fi
  }
  puts out
  retval=$?
  if not retval.success? 
    puts out
    raise KytoonException, "Failed to cleanup instances."
  end
end

.create(sg) ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 151

def self.create(sg)

  ssh_public_key = Kytoon::Util.load_public_key

  base_key_name=File.join(@@data_dir, "#{sg.id}_id_rsa")
  Kytoon::Util.generate_ssh_keypair(base_key_name)
  private_ssh_key=IO.read(base_key_name)
  public_ssh_key=IO.read(base_key_name + ".pub")

  sudo = sg.use_sudo =~ /(true|t|yes|y|1)$/i ? "sudo" : ""
  hosts_file_data = "127.0.0.1\tlocalhost localhost.localdomain\n"
  sg.servers.each do |server|

    image_dir=server['image_dir'] || '/var/lib/libvirt/images'
    disk_path=File.join(image_dir, "#{sg.id}_#{server['hostname']}.img")
    server['disk_path'] = disk_path

    instance_ip = create_instance(sg.id, server['hostname'], server['memory'], server['original'], server['original_xml'], disk_path, server['create_cow'], ssh_public_key, sudo)
    server['ip_address'] = instance_ip
    hosts_file_data += "#{instance_ip}\t#{server['hostname']}\n"
    sg.cache_to_disk
  end

  puts "Copying hosts files..."

gateway_ssh_config = %{
mkdir -p .ssh
cat > .ssh/id_rsa <<-EOF_CAT
#{private_ssh_key}
EOF_CAT
chmod 600 .ssh/id_rsa
cat > .ssh/id_rsa.pub <<-EOF_CAT
#{public_ssh_key}
EOF_CAT
chmod 644 .ssh/id_rsa.pub
cat > .ssh/config <<-EOF_CAT
StrictHostKeyChecking no
EOF_CAT
chmod 600 .ssh/config
}

node_ssh_config= %{
mkdir -p .ssh
cat >> .ssh/authorized_keys <<-EOF_CAT
#{public_ssh_key}\n
EOF_CAT
chmod 600 .ssh/authorized_keys
}

  #now that we have IP info copy hosts files into the servers
  sg.servers.each do |server|
    ping_test(server['ip_address'])
    Kytoon::Util.remote_exec(%{
cat > /etc/hosts <<-EOF_CAT
#{hosts_file_data}
EOF_CAT
hostname "#{server['hostname']}"
if [ -f /etc/sysconfig/network ]; then
sed -e "s|^HOSTNAME.*|HOSTNAME=#{server['hostname']}|" -i /etc/sysconfig/network
fi
#{server['gateway'] == 'true' ? gateway_ssh_config : ""}
#{node_ssh_config}
    }, server['ip_address']) do |ok, out|
      if not ok
        puts out
        raise KytoonException, "Failed to copy host file to instance #{server['hostname']}."
      end
    end
  end

  sg
end

.create_instance(group_id, inst_name, memory_gigs, original, original_xml, disk_path, create_cow, ssh_public_key, sudo) ⇒ Object

Raises:



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 297

def self.create_instance(group_id, inst_name, memory_gigs, original, original_xml, disk_path, create_cow, ssh_public_key, sudo)

  puts "Creating instance: #{inst_name}"
  instance_memory = (KIB_PER_GIG * memory_gigs.to_f).to_i
  original_disk_path = source_disk_filename(original, original_xml) #cow only
  domain_name="#{group_id}_#{inst_name}"

  out = %x{
if [ -n "$DEBUG" ]; then
set -x
fi
export VIRSH_DEFAULT_CONNECT_URI="qemu:///system"
if [ -n "#{original_xml}" ]; then
ORIGIN="--original-xml #{original_xml}"
elif [ -n "#{original}" ]; then
ORIGIN="--original #{original}"
else
  { echo "Please specify 'original' or 'original_xml'."; exit 1; }
fi

if [ -n "#{create_cow}" ]; then

#{sudo} virt-clone --connect="$VIRSH_DEFAULT_CONNECT_URI" \
  --name '#{domain_name}' \
  --file '#{disk_path}' \
  --force \
  $ORIGIN \
  --preserve-data \
  || { echo "failed to virt-clone"; exit 1; }

#{sudo} qemu-img create -f qcow2 -o backing_file=#{original_disk_path} "#{disk_path}"

else

#{sudo} virt-clone --connect="$VIRSH_DEFAULT_CONNECT_URI" \
  --name '#{domain_name}' \
  --file '#{disk_path}' \
  --force \
  $ORIGIN \
  || { echo "failed to virt-clone"; exit 1; }

fi

LV_ROOT=$(#{sudo} virt-filesystems -a #{disk_path} --logical-volumes | grep root)
# If using LVM we inject the ssh key this way
if [ -n "$LV_ROOT" ]; then
#{sudo} guestfish --selinux add #{disk_path} : \
  run : \
  mount $LV_ROOT / : \
  sh "/bin/mkdir -p /root/.ssh" : \
  write-append /root/.ssh/authorized_keys "#{ssh_public_key}\n" : \
  sh "/bin/chmod -R 700 /root/.ssh"
fi

#{sudo} virsh setmaxmem #{domain_name} #{instance_memory}
#{sudo} virsh start #{domain_name}
#{sudo} virsh setmem #{domain_name} #{instance_memory}

  }
  retval=$?
  if not retval.success? 
    puts out
    raise KytoonException, "Failed to create instance #{inst_name}."
  end

  # lookup server IP here... 
  mac_addr = nil
  network_name = nil
  dom_xml = %x{#{sudo} virsh --connect=qemu:///system dumpxml #{domain_name}}
  dom = REXML::Document.new(dom_xml)
  REXML::XPath.each(dom, "//interface/mac") do |interface_xml|
    mac_addr = interface_xml.attributes['address']
  end
  raise KytoonException, "Failed to lookup mac address for #{inst_name}" if mac_addr.nil?
  REXML::XPath.each(dom, "//interface/source") do |interface_xml|
    network_name = interface_xml.attributes['network']
  end
  raise KytoonException, "Failed to lookup network name for #{inst_name}" if network_name.nil?

  instance_ip = %x{grep -i #{mac_addr} /var/lib/libvirt/dnsmasq/#{network_name}.leases | cut -d " " -f 3}.chomp
  count = 0
  until not instance_ip.empty? do
    instance_ip = %x{grep -i #{mac_addr} /var/lib/libvirt/dnsmasq/#{network_name}.leases | cut -d " " -f 3}.chomp
    sleep 1
    count += 1
    if count >= 60 then
        raise KytoonException, "Failed to lookup ip address for #{inst_name}"
    end
  end
  return instance_ip

end

.data_dir ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 25

def self.data_dir
  @@data_dir
end

.data_dir=(dir) ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 29

def self.data_dir=(dir)
  @@data_dir=dir
end

.default_ip_type ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 224

def self.default_ip_type()
  ip_type = Util.load_configs['libvirt_ip_type'] || 4
  ip_type.to_i
end

.from_json(json) ⇒ Object

generate a Server Group XML from server_group.json



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 59

def self.from_json(json)

  json_hash=JSON.parse(json)

  configs = Util.load_configs
  use_sudo = ENV['LIBVIRT_USE_SUDO'] || configs['libvirt_use_sudo'].to_s

  sg=ServerGroup.new(
    :id => json_hash["id"],
    :name => json_hash["name"],
    :use_sudo => use_sudo
  )
  json_hash["servers"].each do |server_hash|

    sg.servers << {
      'hostname' => server_hash['hostname'],
      'memory' => server_hash['memory'],
      'original' => server_hash['original'],
      'original_xml' => server_hash['original_xml'],
      'create_cow' => server_hash['create_cow'],
      'disk_path' => server_hash['disk_path'],
      'ip_address' => server_hash['ip_address'],
      'gateway' => server_hash['gateway'] || "false"
    }
  end
  return sg
end

.get(options = {}) ⇒ Object

Raises:



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 249

def self.get(options={})
  id = options[:id]
  if id.nil? then
    group=ServerGroup.most_recent
    raise NoServerGroupExists, "No server group files exist." if group.nil?
    id=group.id
  end

  out_file=File.join(@@data_dir, "#{id}.json")
  raise NoServerGroupExists, "No server group files exist." if not File.exists?(out_file)
  ServerGroup.from_json(IO.read(out_file))
end

.index(options = {}) ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 262

def self.index(options={})

  server_groups=[]
  Dir[File.join(ServerGroup.data_dir, '*.json')].each do  |file|
    server_groups << ServerGroup.from_json(IO.read(file))
  end
  server_groups

end

.most_recent ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 272

def self.most_recent
  server_groups=[]
  Dir[File.join(@@data_dir, "*.json")].each do  |file|
    server_groups << ServerGroup.from_json(IO.read(file))
  end
  if server_groups.size > 0 then
    server_groups.sort { |a,b| b.id <=> a.id }[0]
  else
    nil
  end
end

.ping_test(ip_addr) ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 229

def self.ping_test(ip_addr)

  ping_timeout = (Util.load_configs['libvirt_ping_timeout'] || 60).to_i

  begin
    ping = self.default_ip_type == 6 ? 'ping6' : 'ping'
    ping_command = "#{ping} -c 1 #{ip_addr} > /dev/null 2>&1"
    Timeout::timeout(ping_timeout) do
      while(1) do
        return true if system(ping_command)
      end
    end
  rescue Timeout::Error => te
    raise KytoonException, "Timeout pinging server: #{ping_command}"
  end

  return false

end

.source_disk_filename(original, original_xml) ⇒ Object

Determine the path of the source disk to be used

Raises:



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 285

def self.source_disk_filename(original, original_xml)
  if original and not original.empty? then
    dom = REXML::Document.new(%x{virsh dumpxml nova1})
  else
    dom = REXML::Document.new(IO.read(original_xml))
  end
  REXML::XPath.each(dom, "//disk[1]/source") do |source_xml|
    return source_xml.attributes['file']
  end
  raise KytoonException, "Unable to find disk path for instance."
end

Instance Method Details

#cache_to_disk ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 116

def cache_to_disk

  sg_hash = {
      'id' => @id,
      'name' => @name,
      'servers' => []
  }
  @servers.each do |server|
      sg_hash['servers'] << {'hostname' => server['hostname'], 'memory' => server['memory'], 'gateway' => server['gateway'], 'original' => server['original'], 'original_xml' => server['original_xml'], 'create_cow' => server['create_cow'], 'disk_path' => server['disk_path'], 'ip_address' => server['ip_address']}
  end

  FileUtils.mkdir_p(@@data_dir)
  File.open(File.join(@@data_dir, "#{@id}.json"), 'w') do |f|
    f.chmod(0600)
    f.write(sg_hash.to_json)
  end
end

#delete ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 134

def delete
  sudo = @use_sudo =~ /(true|t|yes|y|1)$/i ? "sudo" : ""
  servers.each do |server|
    ServerGroup.cleanup_instances(@id, server['hostname'], server['disk_path'], sudo)
  end
  out_file=File.join(@@data_dir, "#{@id}.json")
  File.delete(out_file) if File.exists?(out_file)

  #cleanup ssh keys
  private_ssh_key = File.join(@@data_dir, "#{@id}_id_rsa")
  public_ssh_key = File.join(@@data_dir, "#{@id}_id_rsa.pub")
  [private_ssh_key, public_ssh_key].each do |file|
    File.delete(file) if File.exists?(file)
  end

end

#gateway_ip ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 54

def gateway_ip
  @servers.select {|s| s['gateway'] == 'true' }[0]['ip_address'] if @servers.size > 0
end

#pretty_print ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 87

def pretty_print

  puts "Group ID: #{@id}"
  puts "name: #{@name}"
  puts "gateway IP: #{self.gateway_ip}"
  puts "Servers:"
  servers.each do |server|
    puts "\tname: #{server['hostname']}"
    puts "\t--"
  end

end

#server(name) ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 46

def server(name)
  @servers.select {|s| s['hostname'] == name}[0] if @servers.size > 0
end

#server_names ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 100

def server_names

  names=[]  

  servers.each do |server|
    if block_given? then
      yield server['hostname']
    else
      names << server['hostname']
    end  
  end

  names
  
end

#servers ⇒ Object 



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# File 'lib/kytoon/providers/libvirt/server_group.rb', line 50

def servers
  @servers
end