1 class Node < ArvadosModel
4 include CommonApiTemplate
6 serialize :properties, Hash
7 before_validation :ensure_ping_secret
8 after_update :dns_server_update
10 # Only a controller can figure out whether or not the current API tokens
11 # have access to the associated Job. They're expected to set
12 # job_readable=true if the Job UUID can be included in the API response.
13 belongs_to(:job, foreign_key: :job_uuid, primary_key: :uuid)
14 attr_accessor :job_readable
16 @@max_compute_nodes = Rails.configuration.max_compute_nodes
17 @@dns_server_conf_dir = Rails.configuration.dns_server_conf_dir
18 @@dns_server_conf_template = Rails.configuration.dns_server_conf_template
19 @@dns_server_reload_command = Rails.configuration.dns_server_reload_command
20 @@uuid_prefix = Rails.configuration.uuid_prefix
21 @@domain = Rails.configuration.compute_node_domain rescue `hostname --domain`.strip
22 @@nameservers = Rails.configuration.compute_node_nameservers
24 api_accessible :user, :extend => :common do |t|
31 t.add :api_job_uuid, as: :job_uuid
32 t.add :crunch_worker_state
35 api_accessible :superuser, :extend => :user do |t|
38 t.add lambda { |x| @@nameservers }, :as => :nameservers
46 job_readable ? job_uuid : nil
49 def crunch_worker_state
50 return 'down' if slot_number.nil?
51 case self.info.andand['slurm_state']
63 if db_current_time - self.created_at > 5.minutes
68 elsif db_current_time - self.last_ping_at > 1.hours
76 raise "must have :ip and :ping_secret" unless o[:ip] and o[:ping_secret]
78 if o[:ping_secret] != self.info['ping_secret']
79 logger.info "Ping: secret mismatch: received \"#{o[:ping_secret]}\" != \"#{self.info['ping_secret']}\""
80 raise ArvadosModel::UnauthorizedError.new("Incorrect ping_secret")
83 current_time = db_current_time
84 self.last_ping_at = current_time
86 @bypass_arvados_authorization = true
89 if self.ip_address.nil?
90 logger.info "#{self.uuid} ip_address= #{o[:ip]}"
91 self.ip_address = o[:ip]
92 self.first_ping_at = current_time
95 # Record instance ID if not already known
96 if o[:ec2_instance_id]
97 if !self.info['ec2_instance_id']
98 self.info['ec2_instance_id'] = o[:ec2_instance_id]
99 elsif self.info['ec2_instance_id'] != o[:ec2_instance_id]
100 logger.debug "Multiple nodes have credentials for #{self.uuid}"
101 raise "#{self.uuid} is already running at #{self.info['ec2_instance_id']} so rejecting ping from #{o[:ec2_instance_id]}"
106 if self.slot_number.nil?
109 self.slot_number = try_slot
113 rescue ActiveRecord::RecordNotUnique
116 raise "No available node slots" if try_slot == @@max_compute_nodes
118 self.hostname = self.class.hostname_for_slot(self.slot_number)
121 # Record other basic stats
122 ['total_cpu_cores', 'total_ram_mb', 'total_scratch_mb'].each do |key|
123 if value = (o[key] or o[key.to_sym])
124 self.properties[key] = value.to_i
126 self.properties.delete(key)
135 def ensure_ping_secret
136 self.info['ping_secret'] ||= rand(2**256).to_s(36)
139 def dns_server_update
140 if self.hostname_changed? or self.ip_address_changed?
141 if not self.ip_address.nil?
142 stale_conflicting_nodes = Node.where('id != ? and ip_address = ? and last_ping_at < ?',self.id,self.ip_address,10.minutes.ago)
143 if not stale_conflicting_nodes.empty?
144 # One or more stale compute node records have the same IP address as the new node.
145 # Clear the ip_address field on the stale nodes.
146 stale_conflicting_nodes.each do |stale_node|
147 stale_node.ip_address = nil
152 if self.hostname and self.ip_address
153 self.class.dns_server_update(self.hostname, self.ip_address)
158 def self.dns_server_update(hostname, ip_address)
159 return unless @@dns_server_conf_dir and @@dns_server_conf_template
160 ptr_domain = ip_address.
161 split('.').reverse.join('.').concat('.in-addr.arpa')
162 hostfile = File.join @@dns_server_conf_dir, "#{hostname}.conf"
165 template = IO.read(@@dns_server_conf_template)
167 STDERR.puts "Unable to read dns_server_conf_template #{@@dns_server_conf_template}: #{e.message}"
171 populated = template % {hostname:hostname, uuid_prefix:@@uuid_prefix, ip_address:ip_address, ptr_domain:ptr_domain}
174 File.open hostfile, 'w' do |f|
178 STDERR.puts "Unable to write #{hostfile}: #{e.message}"
181 File.open(File.join(@@dns_server_conf_dir, 'restart.txt'), 'w') do |f|
182 # this will trigger a dns server restart
183 f.puts @@dns_server_reload_command
187 def self.hostname_for_slot(slot_number)
188 "compute#{slot_number}"
191 # At startup, make sure all DNS entries exist. Otherwise, slurmctld
192 # will refuse to start.
193 if @@dns_server_conf_dir and @@dns_server_conf_template
194 (0..@@max_compute_nodes-1).each do |slot_number|
195 hostname = hostname_for_slot(slot_number)
196 hostfile = File.join @@dns_server_conf_dir, "#{hostname}.conf"
197 if !File.exists? hostfile
198 n = Node.where(:slot_number => slot_number).first
199 if n.nil? or n.ip_address.nil?
200 dns_server_update(hostname, '127.40.4.0')
202 dns_server_update(hostname, n.ip_address)
208 def permission_to_update
209 @bypass_arvados_authorization or super
212 def permission_to_create
213 current_user and current_user.is_admin