X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/3c87946740b83f612561f998f7d83586593be830..b5c15775caf865d8fed5d4839d4a082f6518bba4:/services/api/app/models/node.rb

diff --git a/services/api/app/models/node.rb b/services/api/app/models/node.rb
index 044d83c287..f384ba582b 100644
--- a/services/api/app/models/node.rb
+++ b/services/api/app/models/node.rb
@@ -20,10 +20,14 @@ class Node < ArvadosModel
   # Only a controller can figure out whether or not the current API tokens
   # have access to the associated Job.  They're expected to set
   # job_readable=true if the Job UUID can be included in the API response.
-  belongs_to(:job, foreign_key: :job_uuid, primary_key: :uuid)
+  belongs_to :job,
+             foreign_key: 'job_uuid',
+             primary_key: 'uuid',
+             optional: true
   attr_accessor :job_readable
 
   UNUSED_NODE_IP = '127.40.4.0'
+  MAX_VMS = 3
 
   api_accessible :user, :extend => :common do |t|
     t.add :hostname
@@ -39,7 +43,7 @@ class Node < ArvadosModel
   api_accessible :superuser, :extend => :user do |t|
     t.add :first_ping_at
     t.add :info
-    t.add lambda { |x| Rails.configuration.Containers.SLURM.Managed.ComputeNodeNameservers }, :as => :nameservers
+    t.add lambda { |x| Rails.configuration.Containers.SLURM.Managed.ComputeNodeNameservers.keys }, :as => :nameservers
   end
 
   after_initialize do
@@ -158,8 +162,8 @@ class Node < ArvadosModel
                           LIMIT 1',
                           # query label:
                           'Node.available_slot_number',
-                          # [col_id, val] for $1 vars:
-                          [[nil, Rails.configuration.Containers.MaxComputeVMs]],
+                          # bind vars:
+                          [MAX_VMS],
                          ).rows.first.andand.first
   end
 
@@ -168,20 +172,20 @@ class Node < ArvadosModel
   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
         # as the new node. Clear the ip_address field on the stale
         # nodes. Otherwise, we (via SLURM) might inadvertently connect
         # to the new node using the old node's hostname.
-        stale_node.update_attributes!(ip_address: nil)
+        stale_node.update!(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
@@ -267,7 +271,7 @@ class Node < ArvadosModel
       !Rails.configuration.Containers.SLURM.Managed.DNSServerConfTemplate.to_s.empty? and
       !Rails.configuration.Containers.SLURM.Managed.AssignNodeHostname.empty?)
 
-    (0..Rails.configuration.Containers.MaxComputeVMs-1).each do |slot_number|
+    (0..MAX_VMS-1).each do |slot_number|
       hostname = hostname_for_slot(slot_number)
       hostfile = File.join Rails.configuration.Containers.SLURM.Managed.DNSServerConfDir, "#{hostname}.conf"
       if !File.exist? hostfile