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instance_manager.rb
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instance_manager.rb
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# Copyright (c) 2009-2012 VMware, Inc.
module Bosh::Deployer
class InstanceManager
include Helpers
attr_reader :state
attr_accessor :renderer
class LoggerRenderer
attr_accessor :stage, :total, :index
def initialize
enter_stage("Deployer", 0)
end
def enter_stage(stage, total)
@stage = stage
@total = total
@index = 0
end
def update(state, task)
Config.logger.info("#{@stage} - #{state} #{task}")
@index += 1 if state == :finished
end
end
class << self
include Helpers
def create(config)
plugin = cloud_plugin(config)
begin
require "deployer/instance_manager/#{plugin}"
rescue LoadError
err "Could not find Provider Plugin: #{plugin}"
end
Bosh::Deployer::InstanceManager.const_get(plugin.capitalize).new(config)
end
end
def initialize(config)
Config.configure(config)
@state_yml = File.join(config["dir"], DEPLOYMENTS_FILE)
load_state(config["name"])
Config.uuid = state.uuid
@renderer = LoggerRenderer.new
end
def cloud
Config.cloud
end
def agent
Config.agent
end
def logger
Config.logger
end
def disk_model
nil
end
def instance_model
Models::Instance
end
def exists?
state.vm_cid != nil
end
def step(task)
renderer.update(:started, task)
result = yield
renderer.update(:finished, task)
result
end
def start
end
def stop
end
def with_lifecycle
start
yield
ensure
stop
end
def create_deployment(stemcell_tgz)
with_lifecycle do
create(stemcell_tgz)
end
end
def update_deployment(stemcell_tgz)
with_lifecycle do
update(stemcell_tgz)
end
end
def delete_deployment
with_lifecycle do
destroy
end
end
def create(stemcell_tgz)
err "VM #{state.vm_cid} already exists" if state.vm_cid
if state.stemcell_cid && state.stemcell_cid != state.stemcell_name
err "stemcell #{state.stemcell_cid} already exists"
end
renderer.enter_stage("Deploy Micro BOSH", 11)
state.stemcell_cid = create_stemcell(stemcell_tgz)
state.stemcell_name = File.basename(stemcell_tgz, ".tgz")
save_state
step "Creating VM from #{state.stemcell_cid}" do
state.vm_cid = create_vm(state.stemcell_cid)
update_vm_metadata(state.vm_cid, {"Name" => state.name})
discover_bosh_ip
end
save_state
step "Waiting for the agent" do
wait_until_agent_ready
end
step "Updating persistent disk" do
update_persistent_disk
end
unless @apply_spec
step "Fetching apply spec" do
@apply_spec = Specification.new(agent.release_apply_spec)
end
end
apply
step "Waiting for the director" do
wait_until_director_ready
end
end
def destroy
renderer.enter_stage("Delete micro BOSH", 7)
agent_stop
if state.disk_cid
step "Deleting persistent disk `#{state.disk_cid}'" do
delete_disk(state.disk_cid, state.vm_cid)
state.disk_cid = nil
save_state
end
end
delete_vm
delete_stemcell
end
def update(stemcell_tgz)
renderer.enter_stage("Prepare for update", 5)
agent_stop
detach_disk(state.disk_cid)
delete_vm
# Do we always want to delete the stemcell?
# What if we are redeploying to the same stemcell version just so
# we can upgrade to a bigger persistent disk.
# Perhaps use "--preserve" to skip the delete?
delete_stemcell
create(stemcell_tgz)
end
def create_stemcell(stemcell_tgz)
unless is_tgz?(stemcell_tgz)
step "Using existing stemcell" do
end
return stemcell_tgz
end
Dir.mktmpdir("sc-") do |stemcell|
step "Unpacking stemcell" do
run_command("tar -zxf #{stemcell_tgz} -C #{stemcell}")
end
@apply_spec = Specification.load_from_stemcell(stemcell)
# load properties from stemcell manifest
properties = load_stemcell_manifest(stemcell)
# override with values from the deployment manifest
override = Config.cloud_options["properties"]["stemcell"]
properties["cloud_properties"].merge!(override) if override
step "Uploading stemcell" do
cloud.create_stemcell("#{stemcell}/image", properties["cloud_properties"])
end
end
rescue => e
logger.err("create stemcell failed: #{e.message}:\n#{e.backtrace.join("\n")}")
# make sure we clean up the stemcell if something goes wrong
delete_stemcell if is_tgz?(stemcell_tgz) && state.stemcell_cid
raise e
end
def create_vm(stemcell_cid)
resources = Config.resources['cloud_properties']
networks = Config.networks
env = Config.env
cloud.create_vm(state.uuid, stemcell_cid, resources, networks, nil, env)
end
def update_vm_metadata(vm, metadata)
cloud.set_vm_metadata(vm, metadata) if cloud.respond_to?(:set_vm_metadata)
rescue Bosh::Clouds::NotImplemented => e
logger.error(e)
end
def mount_disk(disk_cid)
step "Mount disk" do
agent.run_task(:mount_disk, disk_cid.to_s)
end
end
def unmount_disk(disk_cid)
step "Unmount disk" do
if disk_info.include?(disk_cid)
agent.run_task(:unmount_disk, disk_cid.to_s)
else
logger.error("not unmounting %s as it doesn't belong to me: %s" %
[disk_cid, disk_info])
end
end
end
def migrate_disk(src_disk_cid, dst_disk_cid)
step "Migrate disk" do
agent.run_task(:migrate_disk, src_disk_cid.to_s, dst_disk_cid.to_s)
end
end
def disk_info
return @disk_list if @disk_list
@disk_list = agent.list_disk
end
def create_disk
step "Create disk" do
size = Config.resources['persistent_disk']
state.disk_cid = cloud.create_disk(size, state.vm_cid)
save_state
end
end
# it is up to the caller to save/update disk state info
def delete_disk(disk_cid, vm_cid)
unmount_disk(disk_cid)
begin
step "Detach disk" do
cloud.detach_disk(vm_cid, disk_cid) if vm_cid
end
rescue Bosh::Clouds::DiskNotAttached
end
begin
step "Delete disk" do
cloud.delete_disk(disk_cid)
end
rescue Bosh::Clouds::DiskNotFound
end
end
# it is up to the caller to save/update disk state info
def attach_disk(disk_cid, is_create=false)
return unless disk_cid
cloud.attach_disk(state.vm_cid, disk_cid)
mount_disk(disk_cid)
end
def detach_disk(disk_cid)
unless disk_cid
err "Error: nil value given for persistent disk id"
end
unmount_disk(disk_cid)
step "Detach disk" do
cloud.detach_disk(state.vm_cid, disk_cid)
end
end
def attach_missing_disk
if state.disk_cid
attach_disk(state.disk_cid, true)
end
end
def check_persistent_disk
return if state.disk_cid.nil?
agent_disk_cid = disk_info.first
if agent_disk_cid != state.disk_cid
err "instance #{state.vm_cid} has invalid disk: " +
"Agent reports #{agent_disk_cid} while " +
"deployer's record shows #{state.disk_cid}"
end
end
def update_persistent_disk
attach_missing_disk
check_persistent_disk
if state.disk_cid.nil?
create_disk
attach_disk(state.disk_cid, true)
elsif persistent_disk_changed?
size = Config.resources['persistent_disk']
# save a reference to the old disk
old_disk_cid = state.disk_cid
# create a new disk and attach it
new_disk_cid = cloud.create_disk(size, state.vm_cid)
attach_disk(new_disk_cid, true)
# migrate data (which mounts the disks)
migrate_disk(old_disk_cid, new_disk_cid)
# replace the old with the new in the state file
state.disk_cid = new_disk_cid
# delete the old disk
delete_disk(old_disk_cid, state.vm_cid)
end
ensure
save_state
end
def apply(spec = nil)
agent_stop
spec ||= @apply_spec
step "Applying micro BOSH spec" do
# first update spec with infrastructure specific stuff
update_spec(spec)
# then update spec with generic changes
agent.run_task(:apply, spec.update(bosh_ip, service_ip))
end
agent_start
end
def discover_bosh_ip
bosh_ip
end
def service_ip
bosh_ip
end
def check_dependencies
# nothing to check, move on...
end
private
def bosh_ip
Config.bosh_ip
end
def agent_stop
step "Stopping agent services" do
begin
agent.run_task(:stop)
rescue
end
end
end
def agent_start
step "Starting agent services" do
agent.run_task(:start)
end
end
def wait_until_ready(component, wait_time = 1, retries = 300)
Bosh::Common.retryable(sleep: wait_time, tries: retries,
on: [Bosh::Agent::Error, Errno::ECONNREFUSED, Errno::ETIMEDOUT]) do |tries, e|
logger.debug("Waiting for #{component} to be ready: #{e.inspect}") if tries > 0
yield
true
end
end
def wait_until_agent_ready #XXX >> agent_client
wait_until_ready("agent") { agent.ping }
end
def wait_until_director_ready
port = @apply_spec.director_port
url = "http://#{bosh_ip}:#{port}/info"
wait_until_ready("director") do
info = Yajl::Parser.parse(HTTPClient.new.get(url).body)
logger.info("Director is ready: #{info.inspect}")
end
end
def delete_stemcell
err "Cannot find existing stemcell" unless state.stemcell_cid
if state.stemcell_cid == state.stemcell_name
step "Preserving stemcell" do
end
else
step "Delete stemcell" do
cloud.delete_stemcell(state.stemcell_cid)
end
end
state.stemcell_cid = nil
state.stemcell_name = nil
save_state
end
def delete_vm
err "Cannot find existing VM" unless state.vm_cid
step "Delete VM" do
cloud.delete_vm(state.vm_cid)
end
state.vm_cid = nil
save_state
end
def load_deployments
if File.exists?(@state_yml)
logger.info("Loading existing deployment data from: #{@state_yml}")
Psych.load_file(@state_yml)
else
logger.info("No existing deployments found (will save to #{@state_yml})")
{ "instances" => [], "disks" => [] }
end
end
# TODO remove
def load_apply_spec(dir)
load_spec("#{dir}/apply_spec.yml") do
err "this isn't a micro bosh stemcell - apply_spec.yml missing"
end
end
def load_stemcell_manifest(dir)
load_spec("#{dir}/stemcell.MF") do
err "this isn't a stemcell - stemcell.MF missing"
end
end
def load_spec(file)
yield unless File.exist?(file)
logger.info("Loading yaml from #{file}")
Psych.load_file(file)
end
def generate_unique_name
SecureRandom.uuid
end
def load_state(name)
@deployments = load_deployments
disk_model.insert_multiple(@deployments["disks"]) if disk_model
instance_model.insert_multiple(@deployments["instances"])
@state = instance_model.find(:name => name)
if @state.nil?
@state = instance_model.new
@state.uuid = "bm-#{generate_unique_name}"
@state.name = name
@state.save
else
discover_bosh_ip
end
end
def save_state
state.save
@deployments["instances"] = instance_model.map { |instance| instance.values }
@deployments["disks"] = disk_model.map { |disk| disk.values } if disk_model
File.open(@state_yml, "w") do |file|
file.write(Psych.dump(@deployments))
end
end
def run_command(command)
output = `#{command} 2>&1`
if $?.exitstatus != 0
$stderr.puts output
err "'#{command}' failed with exit status=#{$?.exitstatus} [#{output}]"
end
end
end
end