com.ibm.wsspi.runtime.variable.UndefinedVariableException: Undefined variable HOST

I saw this today on a newly built ODM Rules box ( using Red Hat Enterprise Linux 6.6 )

SystemOut.log

...

[10/18/16 15:44:36:553 BST] 00000001 WsServerImpl  E   WSVR0100W: An error occurred initializing, Node1-DSServer [class com.ibm.ws.runtime.component.ServerImpl]
com.ibm.ws.exception.ConfigurationError: com.ibm.wsspi.runtime.variable.UndefinedVariableException: Undefined variable HOST
at com.ibm.ws.security.core.distSecurityComponentImpl.initialize(distSecurityComponentImpl.java:415)
at com.ibm.ws.security.core.SecurityComponentImpl.initialize(SecurityComponentImpl.java:94)
at com.ibm.ws.runtime.component.ContainerHelper.initWsComponent(ContainerHelper.java:1193)
at com.ibm.ws.runtime.component.ContainerHelper.initializeComponent(ContainerHelper.java:1100)
at com.ibm.ws.runtime.component.ContainerHelper.initializeComponents(ContainerHelper.java:902)
at com.ibm.ws.runtime.component.ContainerImpl.initializeComponents(ContainerImpl.java:776)
at com.ibm.ws.runtime.component.ContainerImpl.initializeComponents(ContainerImpl.java:750)
at com.ibm.ws.runtime.component.ServerImpl.initialize(ServerImpl.java:370)
at com.ibm.ws.runtime.WsServerImpl.bootServerContainer(WsServerImpl.java:293)
at com.ibm.ws.runtime.WsServerImpl.start(WsServerImpl.java:224)
at com.ibm.ws.runtime.WsServerImpl.main(WsServerImpl.java:697)
at com.ibm.ws.runtime.WsServer.main(WsServer.java:59)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at com.ibm.wsspi.bootstrap.WSLauncher.launchMain(WSLauncher.java:234)
at com.ibm.wsspi.bootstrap.WSLauncher.main(WSLauncher.java:96)
at com.ibm.wsspi.bootstrap.WSLauncher.run(WSLauncher.java:77)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at org.eclipse.equinox.internal.app.EclipseAppContainer.callMethodWithException(EclipseAppContainer.java:587)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:198)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:340)
at org.eclipse.core.launcher.Main.basicRun(Main.java:282)
at org.eclipse.core.launcher.Main.run(Main.java:981)
at com.ibm.wsspi.bootstrap.WSPreLauncher.launchEclipse(WSPreLauncher.java:402)
at com.ibm.wsspi.bootstrap.WSPreLauncher.main(WSPreLauncher.java:165)
Caused by: com.ibm.wsspi.runtime.variable.UndefinedVariableException: Undefined variable HOST
at com.ibm.ws.runtime.component.VariableMapImpl.expand(VariableMapImpl.java:433)
at com.ibm.ws.runtime.component.VariableMapImpl.expand(VariableMapImpl.java:327)
at com.ibm.ws.runtime.config.AbstractConfigObject.getString(AbstractConfigObject.java:42)
at com.ibm.ws.security.config.SecurityConfigManagerImpl.getString(SecurityConfigManagerImpl.java:1128)
at com.ibm.ws.security.config.GenericConfigHelperImpl.getString(GenericConfigHelperImpl.java:346)
at com.ibm.ws.security.config.GenericConfigHelperImpl.getString(GenericConfigHelperImpl.java:300)
at com.ibm.ws.security.config.AuthMechanismConfigImpl.getString(AuthMechanismConfigImpl.java:1154)
at com.ibm.ws.security.config.CSIv2ConfigImpl.initializeOnServer(CSIv2ConfigImpl.java:744)
at com.ibm.ws.security.config.CSIv2ConfigImpl.initialize(CSIv2ConfigImpl.java:1130)
at com.ibm.ws.security.config.CSIv2ConfigImpl.<init>(CSIv2ConfigImpl.java:107)
at com.ibm.ws.security.config.SecurityConfigObjectFactoryImpl.createCSIv2Config(SecurityConfigObjectFactoryImpl.java:116)
at com.ibm.ws.security.config.SecurityObjectLocator.do_getCSIv2Config(SecurityObjectLocator.java:869)
at com.ibm.ws.security.config.SecurityObjectLocator.getCSIv2Config(SecurityObjectLocator.java:899)
at com.ibm.ws.security.core.distSecurityComponentImpl.initialize_CSIv2(distSecurityComponentImpl.java:1128)
at com.ibm.ws.security.core.distSecurityComponentImpl.initializeSecurityConfig(distSecurityComponentImpl.java:1308)
at com.ibm.ws.security.core.distSecurityComponentImpl.initialize(distSecurityComponentImpl.java:382)
... 37 more
...

FFDC

...
[10/18/16 15:44:36:495 BST]     FFDC Exception:com.ibm.wsspi.runtime.variable.UndefinedVariableException SourceId:com.ibm.ws.security.core.distSecurityComponentImpl.initialize ProbeId:402 Reporter:com.ibm.ws.security.core.distSecurityComponentImpl@34e74114
com.ibm.wsspi.runtime.variable.UndefinedVariableException: Undefined variable HOST

...

As ever, the internet had the answer: -

Error starting webshpere server using VMware virtual Image

The solution was to ensure that my server's hostname was in /etc/hosts.

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.153.130 odmdemo

Once I did this, and restarted the application server JVM, we were Good To Go (TM)