1 # Copyright (C) The Arvados Authors. All rights reserved.
3 # SPDX-License-Identifier: AGPL-3.0
7 class Node < ArvadosModel
10 include CommonApiTemplate
12 serialize :properties, Hash
13 before_validation :ensure_ping_secret
14 after_update :dns_server_update
16 # Only a controller can figure out whether or not the current API tokens
17 # have access to the associated Job. They're expected to set
18 # job_readable=true if the Job UUID can be included in the API response.
19 belongs_to(:job, foreign_key: :job_uuid, primary_key: :uuid)
20 attr_accessor :job_readable
22 UNUSED_NODE_IP = '127.40.4.0'
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| Rails.configuration.compute_node_nameservers }, :as => :nameservers
42 @bypass_arvados_authorization = false
46 super || Rails.configuration.compute_node_domain
50 job_readable ? job_uuid : nil
53 def crunch_worker_state
54 return 'down' if slot_number.nil?
55 case self.info.andand['slurm_state']
56 when 'alloc', 'comp', 'mix', 'drng'
67 if db_current_time - self.created_at > 5.minutes
72 elsif db_current_time - self.last_ping_at > 1.hours
80 raise "must have :ip and :ping_secret" unless o[:ip] and o[:ping_secret]
82 if o[:ping_secret] != self.info['ping_secret']
83 logger.info "Ping: secret mismatch: received \"#{o[:ping_secret]}\" != \"#{self.info['ping_secret']}\""
84 raise ArvadosModel::UnauthorizedError.new("Incorrect ping_secret")
87 current_time = db_current_time
88 self.last_ping_at = current_time
90 @bypass_arvados_authorization = true
93 if self.ip_address.nil?
94 logger.info "#{self.uuid} ip_address= #{o[:ip]}"
95 self.ip_address = o[:ip]
96 self.first_ping_at = current_time
99 # Record instance ID if not already known
100 if o[:ec2_instance_id]
101 if !self.info['ec2_instance_id']
102 self.info['ec2_instance_id'] = o[:ec2_instance_id]
103 elsif self.info['ec2_instance_id'] != o[:ec2_instance_id]
104 logger.debug "Multiple nodes have credentials for #{self.uuid}"
105 raise "#{self.uuid} is already running at #{self.info['ec2_instance_id']} so rejecting ping from #{o[:ec2_instance_id]}"
110 if self.slot_number.nil?
112 n = self.class.available_slot_number
114 raise "No available node slots"
120 rescue ActiveRecord::RecordNotUnique
127 if self.hostname.nil? and Rails.configuration.assign_node_hostname
128 self.hostname = self.class.hostname_for_slot(self.slot_number)
131 # Record other basic stats
132 ['total_cpu_cores', 'total_ram_mb', 'total_scratch_mb'].each do |key|
133 if value = (o[key] or o[key.to_sym])
134 self.properties[key] = value.to_i
136 self.properties.delete(key)
145 def self.available_slot_number
146 # Join the sequence 1..max with the nodes table. Return the first
147 # (i.e., smallest) value that doesn't match the slot_number of any
149 connection.exec_query('SELECT n FROM generate_series(1, $1) AS slot(n)
150 LEFT JOIN nodes ON n=slot_number
151 WHERE slot_number IS NULL
154 'Node.available_slot_number',
155 # [col_id, val] for $1 vars:
156 [[nil, Rails.configuration.max_compute_nodes]],
157 ).rows.first.andand.first
160 def ensure_ping_secret
161 self.info['ping_secret'] ||= rand(2**256).to_s(36)
164 def dns_server_update
165 if ip_address_changed? && ip_address
166 Node.where('id != ? and ip_address = ?',
167 id, ip_address).each do |stale_node|
168 # One or more(!) stale node records have the same IP address
169 # as the new node. Clear the ip_address field on the stale
170 # nodes. Otherwise, we (via SLURM) might inadvertently connect
171 # to the new node using the old node's hostname.
172 stale_node.update_attributes!(ip_address: nil)
175 if hostname_was && hostname_changed?
176 self.class.dns_server_update(hostname_was, UNUSED_NODE_IP)
178 if hostname && (hostname_changed? || ip_address_changed?)
179 self.class.dns_server_update(hostname, ip_address || UNUSED_NODE_IP)
183 def self.dns_server_update hostname, ip_address
186 ptr_domain = ip_address.
187 split('.').reverse.join('.').concat('.in-addr.arpa')
191 uuid_prefix: Rails.configuration.uuid_prefix,
192 ip_address: ip_address,
193 ptr_domain: ptr_domain,
196 if Rails.configuration.dns_server_conf_dir and Rails.configuration.dns_server_conf_template
200 template = IO.read(Rails.configuration.dns_server_conf_template)
201 rescue IOError, SystemCallError => e
202 logger.error "Reading #{Rails.configuration.dns_server_conf_template}: #{e.message}"
206 hostfile = File.join Rails.configuration.dns_server_conf_dir, "#{hostname}.conf"
207 Tempfile.open(["#{hostname}-", ".conf.tmp"],
208 Rails.configuration.dns_server_conf_dir) do |f|
210 f.puts template % template_vars
212 File.rename tmpfile, hostfile
213 rescue IOError, SystemCallError => e
214 logger.error "Writing #{hostfile}: #{e.message}"
217 if tmpfile and File.file? tmpfile
218 # Cleanup remaining temporary file.
224 if Rails.configuration.dns_server_update_command
225 cmd = Rails.configuration.dns_server_update_command % template_vars
227 logger.error "dns_server_update_command #{cmd.inspect} failed: #{$?}"
232 if Rails.configuration.dns_server_conf_dir and Rails.configuration.dns_server_reload_command
233 restartfile = File.join(Rails.configuration.dns_server_conf_dir, 'restart.txt')
235 File.open(restartfile, 'w') do |f|
236 # Typically, this is used to trigger a dns server restart
237 f.puts Rails.configuration.dns_server_reload_command
239 rescue IOError, SystemCallError => e
240 logger.error "Unable to write #{restartfile}: #{e.message}"
248 def self.hostname_for_slot(slot_number)
249 config = Rails.configuration.assign_node_hostname
251 return nil if !config
253 sprintf(config, {:slot_number => slot_number})
256 # At startup, make sure all DNS entries exist. Otherwise, slurmctld
257 # will refuse to start.
258 if Rails.configuration.dns_server_conf_dir and Rails.configuration.dns_server_conf_template and Rails.configuration.assign_node_hostname
259 (0..Rails.configuration.max_compute_nodes-1).each do |slot_number|
260 hostname = hostname_for_slot(slot_number)
261 hostfile = File.join Rails.configuration.dns_server_conf_dir, "#{hostname}.conf"
262 if !File.exist? hostfile
263 n = Node.where(:slot_number => slot_number).first
264 if n.nil? or n.ip_address.nil?
265 dns_server_update(hostname, UNUSED_NODE_IP)
267 dns_server_update(hostname, n.ip_address)
273 def permission_to_update
274 @bypass_arvados_authorization or super
277 def permission_to_create
278 current_user and current_user.is_admin