refs #4926 Merge branch '4926-getting-started'

[arvados.git] / services / api / app / models / node.rb

diff --git a/services/api/app/models/node.rb b/services/api/app/models/node.rb
index 40b78e90808e3534d8468a808fd2ef24310765a9..c38f6817dbc768f4b380c51b999d75c6526dff61 100644 (file)
--- a/services/api/app/models/node.rb
+++ b/services/api/app/models/node.rb
@@ -137,6 +137,17 @@ class Node < ArvadosModel
 
   def dns_server_update
     if self.hostname_changed? or self.ip_address_changed?
+      if not self.ip_address.nil?
+        stale_conflicting_nodes = Node.where('id != ? and ip_address = ? and last_ping_at < ?',self.id,self.ip_address,10.minutes.ago)
+        if not stale_conflicting_nodes.empty?
+          # One or more stale compute node records have the same IP address as the new node.
+          # Clear the ip_address field on the stale nodes.
+          stale_conflicting_nodes.each do |stale_node|
+            stale_node.ip_address = nil
+            stale_node.save!
+          end
+        end
+      end
       if self.hostname and self.ip_address
         self.class.dns_server_update(self.hostname, self.ip_address)
       end
@@ -166,10 +177,6 @@ class Node < ArvadosModel
       STDERR.puts "Unable to write #{hostfile}: #{e.message}"
       return
     end
-    #  f.puts "address=/#{hostname}/#{ip_address}"
-    #  f.puts "address=/#{hostname}.#{@@domain}/#{ip_address}" if @@domain
-    #  f.puts "ptr-record=#{ptr_domain},#{hostname}"
-    #end
     File.open(File.join(@@dns_server_conf_dir, 'restart.txt'), 'w') do |f|
       # this will trigger a dns server restart
       f.puts @@dns_server_reload_command
@@ -182,13 +189,17 @@ class Node < ArvadosModel
 
   # At startup, make sure all DNS entries exist.  Otherwise, slurmctld
   # will refuse to start.
-  if @@dns_server_conf_dir and @@dns_server_conf_template and
-      !File.exists? (File.join(@@dns_server_conf_dir, hostname_for_slot(MAX_SLOTS-1)))
+  if @@dns_server_conf_dir and @@dns_server_conf_template
     (0..MAX_SLOTS-1).each do |slot_number|
       hostname = hostname_for_slot(slot_number)
-      hostfile = File.join @@dns_server_conf_dir, hostname
+      hostfile = File.join @@dns_server_conf_dir, "#{hostname}.conf"
       if !File.exists? hostfile
-        dns_server_update(hostname, '127.40.4.0')
+        n = Node.where(:slot_number => slot_number).first
+        if n.nil? or n.ip_address.nil?
+          dns_server_update(hostname, '127.40.4.0')
+        else
+          dns_server_update(hostname, n.ip_address)
+        end
       end
     end
   end