X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/4cd89bd1767bece226c412ae7c9ea37669e8706b..508a25a9f3677c913b081e79350bc76d25c76698:/services/api/app/models/node.rb

diff --git a/services/api/app/models/node.rb b/services/api/app/models/node.rb
index c7ac090adc..c8a606e2b8 100644
--- a/services/api/app/models/node.rb
+++ b/services/api/app/models/node.rb
@@ -1,9 +1,19 @@
+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: AGPL-3.0
+
+require 'tempfile'
+
 class Node < ArvadosModel
   include HasUuid
   include KindAndEtag
   include CommonApiTemplate
-  serialize :info, Hash
-  serialize :properties, Hash
+
+  # Posgresql JSONB columns should NOT be declared as serialized, Rails 5
+  # already know how to properly treat them.
+  attribute :properties, :jsonbHash, default: {}
+  attribute :info, :jsonbHash, default: {}
+
   before_validation :ensure_ping_secret
   after_update :dns_server_update
 
@@ -14,6 +24,7 @@ class Node < ArvadosModel
   attr_accessor :job_readable
 
   UNUSED_NODE_IP = '127.40.4.0'
+  MAX_VMS = 3
 
   api_accessible :user, :extend => :common do |t|
     t.add :hostname
@@ -29,7 +40,7 @@ class Node < ArvadosModel
   api_accessible :superuser, :extend => :user do |t|
     t.add :first_ping_at
     t.add :info
-    t.add lambda { |x| Rails.configuration.compute_node_nameservers }, :as => :nameservers
+    t.add lambda { |x| Rails.configuration.Containers.SLURM.Managed.ComputeNodeNameservers.keys }, :as => :nameservers
   end
 
   after_initialize do
@@ -37,7 +48,7 @@ class Node < ArvadosModel
   end
 
   def domain
-    super || Rails.configuration.compute_node_domain
+    super || Rails.configuration.Containers.SLURM.Managed.ComputeNodeDomain
   end
 
   def api_job_uuid
@@ -100,25 +111,7 @@ class Node < ArvadosModel
       end
     end
 
-    # Assign slot_number
-    if self.slot_number.nil?
-      try_slot = 1
-      begin
-        self.slot_number = try_slot
-        begin
-          self.save!
-          break
-        rescue ActiveRecord::RecordNotUnique
-          try_slot += 1
-        end
-        raise "No available node slots" if try_slot == Rails.configuration.max_compute_nodes
-      end while true
-    end
-
-    # Assign hostname
-    if self.hostname.nil? and Rails.configuration.assign_node_hostname
-      self.hostname = self.class.hostname_for_slot(self.slot_number)
-    end
+    assign_slot
 
     # Record other basic stats
     ['total_cpu_cores', 'total_ram_mb', 'total_scratch_mb'].each do |key|
@@ -132,14 +125,51 @@ class Node < ArvadosModel
     save!
   end
 
+  def assign_slot
+    return if self.slot_number.andand > 0
+    while true
+      self.slot_number = self.class.available_slot_number
+      if self.slot_number.nil?
+        raise "No available node slots"
+      end
+      begin
+        save!
+        return assign_hostname
+      rescue ActiveRecord::RecordNotUnique
+        # try again
+      end
+    end
+  end
+
   protected
 
+  def assign_hostname
+    if self.hostname.nil? and Rails.configuration.Containers.SLURM.Managed.AssignNodeHostname
+      self.hostname = self.class.hostname_for_slot(self.slot_number)
+    end
+  end
+
+  def self.available_slot_number
+    # Join the sequence 1..max with the nodes table. Return the first
+    # (i.e., smallest) value that doesn't match the slot_number of any
+    # existing node.
+    connection.exec_query('SELECT n FROM generate_series(1, $1) AS slot(n)
+                          LEFT JOIN nodes ON n=slot_number
+                          WHERE slot_number IS NULL
+                          LIMIT 1',
+                          # query label:
+                          'Node.available_slot_number',
+                          # [col_id, val] for $1 vars:
+                          [[nil, MAX_VMS]],
+                         ).rows.first.andand.first
+  end
+
   def ensure_ping_secret
     self.info['ping_secret'] ||= rand(2**256).to_s(36)
   end
 
   def dns_server_update
-    if ip_address_changed? && ip_address
+    if saved_change_to_ip_address? && ip_address
       Node.where('id != ? and ip_address = ?',
                  id, ip_address).each do |stale_node|
         # One or more(!) stale node records have the same IP address
@@ -149,10 +179,10 @@ class Node < ArvadosModel
         stale_node.update_attributes!(ip_address: nil)
       end
     end
-    if hostname_was && hostname_changed?
-      self.class.dns_server_update(hostname_was, UNUSED_NODE_IP)
+    if hostname_before_last_save && saved_change_to_hostname?
+      self.class.dns_server_update(hostname_before_last_save, UNUSED_NODE_IP)
     end
-    if hostname && (hostname_changed? || ip_address_changed?)
+    if hostname && (saved_change_to_hostname? || saved_change_to_ip_address?)
       self.class.dns_server_update(hostname, ip_address || UNUSED_NODE_IP)
     end
   end
@@ -165,47 +195,57 @@ class Node < ArvadosModel
 
     template_vars = {
       hostname: hostname,
-      uuid_prefix: Rails.configuration.uuid_prefix,
+      uuid_prefix: Rails.configuration.ClusterID,
       ip_address: ip_address,
       ptr_domain: ptr_domain,
     }
 
-    if Rails.configuration.dns_server_conf_dir and Rails.configuration.dns_server_conf_template
+    if (!Rails.configuration.Containers.SLURM.Managed.DNSServerConfDir.to_s.empty? and
+        !Rails.configuration.Containers.SLURM.Managed.DNSServerConfTemplate.to_s.empty?)
+      tmpfile = nil
       begin
         begin
-          template = IO.read(Rails.configuration.dns_server_conf_template)
-        rescue => e
-          logger.error "Reading #{Rails.configuration.dns_server_conf_template}: #{e.message}"
+          template = IO.read(Rails.configuration.Containers.SLURM.Managed.DNSServerConfTemplate)
+        rescue IOError, SystemCallError => e
+          logger.error "Reading #{Rails.configuration.Containers.SLURM.Managed.DNSServerConfTemplate}: #{e.message}"
           raise
         end
 
-        hostfile = File.join Rails.configuration.dns_server_conf_dir, "#{hostname}.conf"
-        File.open hostfile+'.tmp', 'w' do |f|
+        hostfile = File.join Rails.configuration.Containers.SLURM.Managed.DNSServerConfDir, "#{hostname}.conf"
+        Tempfile.open(["#{hostname}-", ".conf.tmp"],
+                                 Rails.configuration.Containers.SLURM.Managed.DNSServerConfDir) do |f|
+          tmpfile = f.path
           f.puts template % template_vars
         end
-        File.rename hostfile+'.tmp', hostfile
-      rescue => e
+        File.rename tmpfile, hostfile
+      rescue IOError, SystemCallError => e
         logger.error "Writing #{hostfile}: #{e.message}"
         ok = false
+      ensure
+        if tmpfile and File.file? tmpfile
+          # Cleanup remaining temporary file.
+          File.unlink tmpfile
+        end
       end
     end
 
-    if Rails.configuration.dns_server_update_command
-      cmd = Rails.configuration.dns_server_update_command % template_vars
+    if !Rails.configuration.Containers.SLURM.Managed.DNSServerUpdateCommand.empty?
+      cmd = Rails.configuration.Containers.SLURM.Managed.DNSServerUpdateCommand % template_vars
       if not system cmd
         logger.error "dns_server_update_command #{cmd.inspect} failed: #{$?}"
         ok = false
       end
     end
 
-    if Rails.configuration.dns_server_conf_dir and Rails.configuration.dns_server_reload_command
-      restartfile = File.join(Rails.configuration.dns_server_conf_dir, 'restart.txt')
+    if (!Rails.configuration.Containers.SLURM.Managed.DNSServerConfDir.to_s.empty? and
+        !Rails.configuration.Containers.SLURM.Managed.DNSServerReloadCommand.to_s.empty?)
+      restartfile = File.join(Rails.configuration.Containers.SLURM.Managed.DNSServerConfDir, 'restart.txt')
       begin
         File.open(restartfile, 'w') do |f|
           # Typically, this is used to trigger a dns server restart
-          f.puts Rails.configuration.dns_server_reload_command
+          f.puts Rails.configuration.Containers.SLURM.Managed.DNSServerReloadCommand
         end
-      rescue => e
+      rescue IOError, SystemCallError => e
         logger.error "Unable to write #{restartfile}: #{e.message}"
         ok = false
       end
@@ -215,7 +255,7 @@ class Node < ArvadosModel
   end
 
   def self.hostname_for_slot(slot_number)
-    config = Rails.configuration.assign_node_hostname
+    config = Rails.configuration.Containers.SLURM.Managed.AssignNodeHostname
 
     return nil if !config
 
@@ -224,10 +264,13 @@ class Node < ArvadosModel
 
   # At startup, make sure all DNS entries exist.  Otherwise, slurmctld
   # will refuse to start.
-  if Rails.configuration.dns_server_conf_dir and Rails.configuration.dns_server_conf_template and Rails.configuration.assign_node_hostname
-    (0..Rails.configuration.max_compute_nodes-1).each do |slot_number|
+  if (!Rails.configuration.Containers.SLURM.Managed.DNSServerConfDir.to_s.empty? and
+      !Rails.configuration.Containers.SLURM.Managed.DNSServerConfTemplate.to_s.empty? and
+      !Rails.configuration.Containers.SLURM.Managed.AssignNodeHostname.empty?)
+
+    (0..MAX_VMS-1).each do |slot_number|
       hostname = hostname_for_slot(slot_number)
-      hostfile = File.join Rails.configuration.dns_server_conf_dir, "#{hostname}.conf"
+      hostfile = File.join Rails.configuration.Containers.SLURM.Managed.DNSServerConfDir, "#{hostname}.conf"
       if !File.exist? hostfile
         n = Node.where(:slot_number => slot_number).first
         if n.nil? or n.ip_address.nil?