title: Cassandra2.0.1 fail to restart when private ip is changed on ec2 with ebs
body: <p>I use a cassandra cluster of 3 EC2 instance nodes on AWS.</p>
  
  <p>Each node mount a EBS volume to the path(/usr/lib/cassandra/), so data of cassandra is stored in EBS volume. </p>
  
  <p>All nodes have a dns to point the private ip of themselves. And all cassandra configure files use the DNS instead of the private ip.</p>
  
  <p>My question is that: when an node is teminated, and i will lanuch another cassandra, and mount the EBS to the newly-launched instance, so the data will not be losted. But when starting cassandra service, cassandra service will fail. And the log is as bellow:</p>
  
  <p>I don't know why it will use ip of other nodes ?</p>
  
  <pre><code> INFO 12:47:36,364 Writing Memtable-schema_keyspaces@1358300025(251/2510 serialized/live bytes, 8 ops)
   INFO 12:47:36,367 Enqueuing flush of Memtable-schema_columns@1982787565(91991/919910 serialized/live bytes, 2375 ops)
   INFO 12:47:36,367 Enqueuing flush of Memtable-schema_columnfamilies@59370809(38866/388660 serialized/live bytes, 1052 ops)
   INFO 12:47:36,385 Completed flushing /var/lib/cassandra/data/system/schema_keyspaces/system-schema_keyspaces-jb-10-Data.db (214 bytes) for commitlog position ReplayPosition(segmentId=1382719654978, position=289)
   INFO 12:47:36,391 Writing Memtable-schema_columns@1982787565(91991/919910 serialized/live bytes, 2375 ops)
   INFO 12:47:36,627 Completed flushing /var/lib/cassandra/data/system/schema_columns/system-schema_columns-jb-24-Data.db (19358 bytes) for commitlog position ReplayPosition(segmentId=1382719654978, position=289)
   INFO 12:47:36,628 Writing Memtable-schema_columnfamilies@59370809(38866/388660 serialized/live bytes, 1052 ops)
   INFO 12:47:36,660 Completed flushing /var/lib/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-jb-24-Data.db (8750 bytes) for commitlog position ReplayPosition(segmentId=1382719654978, position=289)
   INFO 12:47:36,661 Log replay complete, 64 replayed mutations
   INFO 12:47:36,746 Compacting [SSTableReader(path='/var/lib/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-jb-23-Data.db'), SSTableReader(path='/var/lib/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-jb-22-Data.db'), SSTableReader(path='/var/lib/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-jb-24-Data.db'), SSTableReader(path='/var/lib/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-jb-21-Data.db')]
   INFO 12:47:37,584 Compacted 4 sstables to [/var/lib/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-jb-25,].  34,990 bytes to 8,759 (~25% of original) in 809ms = 0.010325MB/s.  16 total rows, 4 unique.  Row merge counts were {1:0, 2:0, 3:0, 4:4, }
   INFO 12:47:38,411 Cassandra version: 2.0.1
   INFO 12:47:38,412 Thrift API version: 19.37.0
   INFO 12:47:38,425 CQL supported versions: 2.0.0,3.1.1 (default: 3.1.1)
   INFO 12:47:38,485 Loading persisted ring state
  ERROR 12:47:38,537 Exception encountered during startup
  java.lang.RuntimeException: Unknown host /172.31.9.175 with no default configured
          at org.apache.cassandra.locator.PropertyFileSnitch.getEndpointInfo(PropertyFileSnitch.java:90)
          at org.apache.cassandra.locator.PropertyFileSnitch.getDatacenter(PropertyFileSnitch.java:113)
          at org.apache.cassandra.locator.DynamicEndpointSnitch.getDatacenter(DynamicEndpointSnitch.java:127)
          at org.apache.cassandra.locator.TokenMetadata$Topology.addEndpoint(TokenMetadata.java:1049)
          at org.apache.cassandra.locator.TokenMetadata.updateNormalTokens(TokenMetadata.java:187)
          at org.apache.cassandra.locator.TokenMetadata.updateNormalTokens(TokenMetadata.java:159)
          at org.apache.cassandra.service.StorageService.initServer(StorageService.java:470)
          at org.apache.cassandra.service.StorageService.initServer(StorageService.java:428)
          at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:343)
          at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:442)
          at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:485)
  java.lang.RuntimeException: Unknown host /172.31.9.175 with no default configured
          at org.apache.cassandra.locator.PropertyFileSnitch.getEndpointInfo(PropertyFileSnitch.java:90)
          at org.apache.cassandra.locator.PropertyFileSnitch.getDatacenter(PropertyFileSnitch.java:113)
          at org.apache.cassandra.locator.DynamicEndpointSnitch.getDatacenter(DynamicEndpointSnitch.java:127)
          at org.apache.cassandra.locator.TokenMetadata$Topology.addEndpoint(TokenMetadata.java:1049)
          at org.apache.cassandra.locator.TokenMetadata.updateNormalTokens(TokenMetadata.java:187)
          at org.apache.cassandra.locator.TokenMetadata.updateNormalTokens(TokenMetadata.java:159)
          at org.apache.cassandra.service.StorageService.initServer(StorageService.java:470)
          at org.apache.cassandra.service.StorageService.initServer(StorageService.java:428)
          at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:343)
          at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:442)
          at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:485)
  Exception encountered during startup: Unknown host /172.31.9.175 with no default configured
  </code></pre>