Throw exceptions when boot ladle server on Linux

[pengisgood]

We are running Jenkins CI on Amazon Linux instance which need to start ladle server for testing.
Here is our invoke code snippet:

mock_ldap_server = Ladle::Server.new :quiet => false,
          :port => ladle_port,
          :ldif   => 'ldap/xxx.ldif',
          :custom_schemas => "ldap/xxx.schema",
          :domain => 'DC=XXX,DC=internal',
          :tmpdir => 'tmp'
puts "Booting ladle for #{Rails.env}..."
mock_ldap.start
Process.wait

Here is the error log:

Starting server on 3897
Booting ladle for test...
ApacheDS: ERROR: Unable to set localhost. This prevents creation of a GUID. Cause was: ip-xx-xx-x-xx: ip-xx-xx-x-xx: Name or service not known
ApacheDS: java.net.UnknownHostException: ip-xx-xx-x-xx: ip-xx-xx-x-xx: Name or service not known
ApacheDS:   at java.net.InetAddress.getLocalHost(InetAddress.java:1496)
ApacheDS:   at net.sf.ehcache.Cache.<clinit>(Cache.java:200)
ApacheDS:   at net.sf.ehcache.config.ConfigurationHelper.createCache(ConfigurationHelper.java:302)
ApacheDS:   at net.sf.ehcache.config.ConfigurationHelper.createDefaultCache(ConfigurationHelper.java:218)
ApacheDS:   at net.sf.ehcache.CacheManager.configure(CacheManager.java:600)
ApacheDS:   at net.sf.ehcache.CacheManager.init(CacheManager.java:359)
ApacheDS:   at net.sf.ehcache.CacheManager.<init>(CacheManager.java:228)
ApacheDS:   at org.apache.directory.server.core.api.CacheService.initialize(CacheService.java:127)
ApacheDS:   at net.detailedbalance.ladle.Server.start(Server.java:122)
ApacheDS:   at net.detailedbalance.ladle.Main.main(Main.java:64)
ApacheDS: Caused by: java.net.UnknownHostException: ip-xx-xx-x-xx: Name or service not known
ApacheDS:   at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
ApacheDS:   at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:922)
ApacheDS:   at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1316)
ApacheDS:   at java.net.InetAddress.getLocalHost(InetAddress.java:1492)
ApacheDS:   ... 9 more
ApacheDS: WARN: failed to create certificate subject name from host name
ApacheDS: java.net.UnknownHostException: ip-xx-xx-x-xx: ip-xx-xx-x-xx: Name or service not known
ApacheDS:   at java.net.InetAddress.getLocalHost(InetAddress.java:1496)
ApacheDS:   at org.apache.directory.server.core.security.TlsKeyGenerator.addKeyPair(TlsKeyGenerator.java:266)
ApacheDS:   at org.apache.directory.server.core.DefaultDirectoryService.createBootstrapEntries(DefaultDirectoryService.java:1466)
ApacheDS:   at org.apache.directory.server.core.DefaultDirectoryService.initialize(DefaultDirectoryService.java:1815)
ApacheDS:   at org.apache.directory.server.core.DefaultDirectoryService.startup(DefaultDirectoryService.java:1244)
ApacheDS:   at net.detailedbalance.ladle.Server.start(Server.java:142)
ApacheDS:   at net.detailedbalance.ladle.Main.main(Main.java:64)
ApacheDS: Caused by: java.net.UnknownHostException: ip-10-48-2-74: Name or service not known
ApacheDS:   at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
ApacheDS:   at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:922)
ApacheDS:   at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1316)
ApacheDS:   at java.net.InetAddress.getLocalHost(InetAddress.java:1492)
ApacheDS:   ... 6 more

Anyone has any ideas?