1. Overview

This document describes how to use the JBoss Server Migration Tool to migrate from WildFly 9.0 to WildFly 12.0.

----------------------------------------------------------
----  JBoss Server Migration Tool  -----------------------
----------------------------------------------------------

Retrieving servers...
INFO SOURCE server name: WildFly, version: 9.0.2.Final.
INFO TARGET server name: WildFly, version: 12.0.0.Final.

Server migration starting...

The server migration from WildFly 9.0 to WildFly 12.0 includes:

  • Modules Migration

  • Standalone Server Migration

  • Managed Domain Migration

2. Modules Migration

The JBoss Server Migration Tool is capable of migrating any module installed in the source server, as long as the module is not already installed on the target server.

The migration of source server’s module can be done explicitly, i.e. by user demand, or implicitly, because a migrated module or server configuration depends on it.

You can specify which modules should be migrated or not, by using the modules.includes and modules.excludes environment properties:

  • A module whose ID is referenced by the modules.excludes environment property is never migrated.

  • A module whose ID is referenced by the modules.includes environment property is always migrated, unless it referenced by the modules.excludes environment property.

Important
 The syntax for a module ID is name:slot; The slot is optional, and if it is not specified, defaults to main.

As an example, to migrate modules com.example.moduleA and com.example.moduleB, and do not migrate module com.example.moduleC:

  • You can configure the properties in the tool’s config/environment.properties file:

    modules.includes=com.example.moduleA,com.example.moduleB
modules.excludes=com.example.moduleC

  • You can include the above properties in your own custom properties file, and then pass the file on the command line using the --environment argument.

  • You can pass the information on the command line using a system property. The environment property names must be prefixed with jboss.server.migration.:

    -Djboss.server.migration.modules.includes="com.example.moduleA,com.example.moduleB" -Djboss.server.migration.modules.excludes="com.example.moduleC"
Warning
 The JBoss Server Migration Tool does not verify that the source server’s module is compatible with the target server, and the migration of an incompatible module may cause the target server to malfunction, or not work at all.

3. Standalone Server Migration

3.1. Standalone Configuration Processing Overview

When tasked to migrate standalone server configurations, the JBoss Server Migration Tool migrates the configuration files and related content from the source server to the target server. This migration task is optional.

If you run the migration tool in interactive mode, which is the default, you are are prompted to confirm its execution.

Migrate the source's standalone server?
yes/no?

  • If you reply with yes or y, the standalone server migration proceeds.

  • If you reply with no or n, the standalone server migration is skipped.

If you choose to proceed, the tool starts by migrating the source standalone server’s content. Because both the source and target servers use a similar cyphered content repository to store data that is referenced by standalone server configurations, such as deployments and deployment overlays, migration of this data merely consists of finding and copying the content from the source server to the target server.

 INFO  --- Migrating standalone server...

 INFO  Source's standalone content migrated.

Next, the tool scans the source server for standalone server configurations files and prints the results in the console.

 INFO  Source's standalone configurations found: [standalone-full-ha.xml, standalone-full.xml, standalone-ha.xml, standalone.xml]

If you run the migration tool in non-interactive mode, the JBoss Server Migration Tool migrates all listed configuration files.

If you run the migration tool in interactive mode, which is the default, you are presented with the following prompt.

Migrate all configurations?
yes/no?

  • If you reply yes, all listed configuration files are migrated.

  • If you reply no, you receive a prompt asking to confirm the migration, for each listed configuration file:

    Migrate configuration standalone-full-ha.xml ?
yes/no? y

3.2. Customizing the Migration of the Standalone Configuration

The standalone server migration can be customized by configuring the following environment properties:

Property Name Property Description

standalone.skip

If set to true, the tool skips the entire standalone server migration.

server.source.standalone.serverDir

Defines an alternative path for the source’s standalone server directory. Please note that a non absolute path is considered relative to the source server’s base directory, and if not defined this property defaults to "standalone".

server.source.standalone.configDir

Defines an alternative path for the source’s standalone server configuration directory. Please note that a non absolute path is considered relative to the source’s standalone server directory, and if not defined this property defaults to "configuration".

server.source.standalone.configFiles

Specifies the file names of the source standalone server configurations to be migrated.

server.target.standalone.serverDir

Defines an alternative path for the target’s standalone server directory. Please note that a non absolute path is considered relative to the target server’s base directory, and if not defined this property defaults to "standalone".

server.target.standalone.configDir

Defines an alternative path for the target’s standalone server configuration directory. Please note that a non absolute path is considered relative to the target’s standalone server directory, and if not defined this property defaults to "configuration".

The environment configuration can be customized in one of the following ways:

  • You can configure the properties in the tool’s config/environment.properties file:

    standalone.skip=false
server.source.standalone.serverDir=standalone
server.source.standalone.configDir=configuration
server.source.standalone.configFiles=standalone.xml,standalone-full.xml
server.target.standalone.serverDir=standalone
server.target.standalone.configDir=configuration

  • You can include the above properties in your own custom properties file, and then pass the file on the command line using the --environment argument.

  • You can pass the information on the command line using a system property. The environment property names must be prefixed with jboss.server.migration., for example:

    -Djboss.server.migration.server.source.standalone.serverDir="standalone"

3.3. Standalone Configuration File Migration

When migrating the standalone server configuration, the JBoss Server Migration Tool first copies the source configuration files to the target server. It then updates the configuration to not only work correctly in the target server, but also to take advantage of the target server’s new functionality.

3.3.1. Remove Unsupported Subsystems

All subsystems, and related extensions, which are not supported by WildFly 12.0, are automatically removed from a migrated configuration.

Note
 A subsystem installed in WildFly 9.0 by the user, is also considered as unsupported by WildFly 12.0, and by default will not be migrated.

The console logs the configuration namespaces, and extension modules, of unsupported subsystems removed from the server configuration being migrated:

 INFO  Unsupported extensions removed: [com.example.extension1]
 INFO  Unsupported subsystems removed: [urn:example:domain:subsystem1:1.0]

It is possible to override the default behaviour and indicate subsystems and extensions which should always, or never, be migrated, by configuring the following environment properties:

Property Name Property Description

extensions.excludes

A list with the module names of extensions that should never be migrated.

extensions.includes

A list with the module names of extensions that should always be migrated.

subsystems.excludes

A list with the XML Namespaces, without the version part, of subsystems that should never be migrated.

subsystems.includes

A list with the XML Namespaces, without the version part, of subsystems that should always be migrated.

The environment configuration can be customized in one of the following ways:

  • You can configure the properties in the tool’s config/environment.properties file:

    extensions.excludes=com.example.extension1
extensions.includes=com.example.extension2,com.example.extension3
subsystems.excludes=urn:example:domain:subsystem1
subsystems.includes=urn:example:domain:subsystem2,urn:example:domain:subsystem3

  • You can include the above properties in your own custom properties file, and then pass the file on the command line using the --environment argument.

  • You can pass the information on the command line using a system property. The environment property names must be prefixed with jboss.server.migration., for example:

    -Djboss.server.migration.extensions.excludes="com.example.extension1" -Djboss.server.migration.subsystems.excludes="urn:example:domain:subsystem1"

3.3.2. Migrate Referenced Modules

A migrated configuration may reference and depend on a module that is not installed on the target server. The tool automatically migrates the referenced modules, and their dependent modules as well.

A module is migrated when it is referenced by:

  • A security-realm configuration, as plug-in(s) module

  • A datasource subsystem configuration, as datasource driver(s) module

  • An ee subsystem configuration, as a global module

  • A naming subsystem configuration, as an Object Factory module

  • A messaging subsystem configuration, as JMS Bridge module

  • A vault configuration

  • An extension not installed in the target server

The console logs a message noting the module ID for any module that is migrated, for example:

INFO  Module cmtool.security-realms:main migrated.
INFO  Module cmtool.datasources:main migrated.
INFO  Module cmtool.ee1:main migrated.
INFO  Module cmtool.ee2:main migrated.
INFO  Module cmtool.naming:main migrated.
Tip
 It is possible to exclude the migration of specific modules by specifying the id(s) in the environment property named modules.excludes.

3.3.3. Migrate Referenced Paths

A migrated configuration may reference paths, i.e. files and directories, which may need to be migrated to the target server.

A referenced path is migrated only if it’s not an absolute path, and such migration consists in copying the resource to such path, but relative to the migrated configuration, in the target server.

The tools automatically migrates the following paths references:

  • Vault keystore and encrypted file’s directory.

The console logs a message noting the migrations of paths:

 INFO  Referenced paths migrated.

If you prefer, you can configure the environment properties to customize the migration of referenced paths.

Property Name Property Description

paths.migrate-paths-requested-by-configuration.vault.skip

If set to true, the tool skips the migration of Vault referenced paths.

3.3.4. Migrate messaging Subsystem

The messaging subsystem is deprecated in WildFly 12.0 and is replaced by the messaging-activemq subsystem.

By default, the JBoss Server Migration Tool automatically migrates any legacy subsystem configuration found. If you prefer this migration task is not executed, you can set the subsystem.messaging.migrate.skip environment property value to true.

The legacy subsystem migration is done without requiring any interaction from the user.

The outcome of the legacy messaging subsystem migration is printed in the console, as an example:

 INFO  Subsystem messaging migrated.

Any issues encountered during the migration are written to the log files and displayed in the migration console.

3.3.5. Update the infinispan Subsystem

The JBoss Server Migration Tool makes the following updates to the infinispan subsystem configuration to better match the WildFly 12.0 default configurations.

  • Fixes the module name in the hibernate cache configuration.

  • Adds concurrent cache to the web cache container, which is present in the WildFly 12.0 default configuration.

By default, the tool automatically updates any infinispan subsystem configuration to include these changes. If you prefer, you can configure the environment properties to customize the process of updating the infinispan subsystem configuration.

Property Name Property Description

subsystem.infinispan.update.skip

If set to true, the tool skips the update of the infinispan subsystem.

subsystem.infinispan.update.fix-hibernate-cache-module-name.skip

If set to true, the tool does not fix the module name in the hibernate cache configuration.

subsystem.infinispan.update.update-infinispan-web-cache.skip

If set to true, the tool does not adds concurrent cache to the web cache container.

Upon successful migration of a infinispan subsystem configuration, you should see the following message in the console:

 INFO  Subsystem infinispan updated.

3.3.6. Update the undertow Subsystem

The JBoss Server Migration Tool applies the following changes to undertow subsystem configurations.

  • Sets the default HTTPS listener.

  • Adds support for HTTP2.

  • Sets the default Server response header.

  • Sets the default HTTP Invoker.

By default, the tool automatically updates any undertow subsystem configuration to include these changes. If you prefer, you can configure the environment properties to customize the process of updating the undertow subsystem configuration.

Property Name Property Description

subsystem.undertow.update.skip

If set to true, the tool skips the update of the undertow subsystem.

subsystem.undertow.update.add-undertow-https-listener.skip

If set to true, the tool does not sets the default HTTPS listener.

subsystem.undertow.update.enable-http2.skip

If set to true, the tool does not add support for HTTP2.

subsystem.undertow.update.add-response-header.server-header.skip

If set to true, the tool does not set the default Server response header.

subsystem.undertow.update.add-http-invoker.skip

If set to true, the tool does not sets the default HTTP Invoker.

Upon successful migration of a undertow subsystem configuration, you should see the following message in the console:

 INFO  Subsystem undertow updated.

3.3.7. Add the batch-jberet Subsystem

The WildFly 12.0 batch-jberet subsystem provides support for JSR 352: Batch Applications for the Java Platform.

Its default configuration is automatically added to the migrated configuration file, unless the environment property named subsystem.batch-jberet.add.skip is set to true.

The subsystem and related extension are added without any interaction required by the user. Upon successful addition of the batch-jberet subsystem configuration, you should see the following messages in the console:

 INFO  Subsystem batch-jberet added.

3.3.8. Add the core-management Subsystem

The WildFly 12.0 core-management subsystem provides WildFly Core management-related resources, which previously were configured on its kernel, for instance the server configuration’s changes history feature.

Its default configuration is automatically added to the migrated configuration file, unless the environment property named subsystem.core-management.add.skip is set to true.

The subsystem and related extension are added without any interaction required by the user. Upon successful addition of the core-management subsystem configuration, you should see the following messages in the console:

 INFO  Subsystem core-management added.

3.3.9. Add the elytron Subsystem

The WildFly 12.0 elytron subsystem provides Elytron, a new security framework, which will completely replace the combination of PicketBox and JAAS as the unified client and server security mechanism.

Its default configuration is automatically added to the migrated configuration file, unless the environment property named subsystem.elytron.add.skip is set to true.

The subsystem and related extension are added without any interaction required by the user. Upon successful addition of the elytron subsystem configuration, you should see the following messages in the console:

 INFO  Subsystem elytron added.

3.3.10. Add the singleton Subsystem

As its name indicates, the WildFly 12.0 singleton subsystem provides the singleton functionality.

Its default configuration is automatically added to the migrated configuration file, unless the environment property named subsystem.singleton.add.skip is set to true.

The subsystem and related extension are added without any interaction required by the user. Upon successful addition of the singleton subsystem configuration, you should see the following messages in the console:

 INFO  Subsystem singleton added.

3.3.11. Set Up Private Interface

The WildFly 12.0 default configuration uses a new private interface on all jgroups socket bindings. The JBoss Server Migration Tool automatically adds the new interface to migrated configurations with jgroups socket bindings, and updates these to use it.

Upon successful configuration of the private interface, you should see the following messages in the console:

 INFO  Interface private added.

If you prefer to skip the configuration of the private interface, set the environment property named interface.private.setup.skip to true.

3.3.12. Add Socket Binding Multicast Address Expressions

The WildFly 12.0 default configurations uses value expressions in the multicast-address attribute of modcluster socket bindings, and the migration tool automatically adds such value expressions to migrated configurations.

The following message(s) in the console indicates the configuration update:

INFO  Socket binding's multicast address expressions added.
Note
 The Migration Environment may be configured to skip this specific task, by setting environment property named socket-bindings.multicast-address.add-expressions.skip as true.

3.3.13. Migrate Compatible Security Realms

Because the WildFly 12.0 security realms configuration is fully compatible with the WildFly 9.0 security realms configuration, they require no update by the JBoss Server Migration Tool. However, if the properties files are not referenced using an absolute path, the tool copies them to the path expected by the migrated configuration file.

This process is fully automated and requires no interaction by the user. To skip the security realms migration, set the security-realms.migrate-properties.skip environment property to true.

Upon successful migration of the security realms configuration, you should see the following messages in the console:

INFO  Security realms migrated.

3.3.14. Add default SSL Server Identity to ApplicationRealm

WildFly 12.0 default configurations include a SSL Server Identity for the default Security Realm named ApplicationRealm, and the migration tool automatically updates migrated configurations to match such change.

The following message(s) printed on the migration console and log(s), indicates this configuration update:

INFO  Security realm ApplicationRealm SSL server identity configured.
Note
 The Migration Environment may be configured to skip this configuration update, by setting environment property named security-realm.ApplicationRealm.add-ssl-server-identity.skip as true.

3.3.15. Migrate Deployments

The JBoss Server Migration Tool, when migrating a configuration, may also migrate:

  • Deployments it references, also known as persistent deployments.

  • Deployments found in directories monitored by its deployment scanners.

  • Deployment Overlays it references.

Warning
 The migration of a deployment or deployment overlay merely consists of installing related file resources on the target server, and possibly updating the migrated configuration. The tool will not assert if these resources are compatible with the target server, which means that a migrated deployment might not work as expected, or might not work at all. Red Hat recommends that you use Red Hat Application Migration Toolkit to analyze a deployment with respect to compatibility among different JBoss servers.
Note
 If you run the migration tool in non-interactive mode, by default the JBoss Server Migration Tool will not migrate any deployments and overlays. To migrate deployments the environment property deployments.migrate-deployments.skip should be set as false.
Migrate Persistent Deployments

When migrating a configuration, the tool searches for references to deployments persisted in the source server, and prints the names of the deployments found in the console, e.g.:

INFO  Persistent deployments found: [cmtool-helloworld3.war, cmtool-helloworld4.war, cmtool-helloworld2.war, cmtool-helloworld1.war]

If you run the migration tool in interactive mode, you then see the following prompt:

This tool is not able to assert if persistent deployments found are compatible with the target server, skip persistent deployments migration?
yes/no?

  • If you reply yes, or y, the all deployment references are removed from the migrated configuration, i.e. the deployments will not be migration.

  • If you reply no, or n, you receive an additional prompt asking if all deployments should be the migrated:

    Migrate all persistent deployments found?
yes/no?

    • If you reply yes, or y, all deployments are migrated.

    • If you reply no, or n, you receive a prompt asking to confirm the migration for each referenced deployment:

      Migrate persistent deployment 'cmtool-helloworld3.war'?
yes/no?

      • If you reply yes, or y, the deployment is migrated.

      • If you reply no, or n, the deployment reference is removed from the migrated configuration, i.e. the deployment is not migrated.

        INFO  Persistent deployment cmtool-helloworld3.war migrated.

If you run the migration tool in non-interactive mode, the JBoss Server Migration Tool will migrate or not migrate all persistent deployments, depending on the environment configuration. Persistent deployments are migrated only if none of the following environment properties is set as true:

  • deployments.migrate-deployments.skip

  • deployments.migrate-persistent-deployments.skip

Migrate Deployment Scanner Deployments

Deployment scanners monitor a directory for new files and manage their deployment automatically or through special deployment marker files, and the migration tool, when migrating the server configuration, first searches for any configured deployment scanners, and then for each scanner found, searches its monitored directories for deployments marked as deployed.

A list with the names of deployments found are printed to the console, for instance:

INFO  Non-persistent deployments found in /wildfly-9.0/standalone/deployments: [cmtool-helloworld5.war, cmtool-helloworld6.war]

If you run the migration tool in interactive mode, you then see the following prompt:

This tool is not able to assert if the non-persistent deployments found are compatible with the target server, skip scanner's deployments migration?
yes/no?

  • If you reply yes, or y, all deployments are not migrated.

  • If you reply no, or n, you receive an additional prompt asking if all deployments should be the migrated:

    Migrate all non-persistent deployments found?
yes/no?

    • If you reply yes, or y, all deployments are migrated.

      INFO  Non-persistent deployment cmtool-helloworld5.war migrated.
INFO  Non-persistent deployment cmtool-helloworld6.war migrated.

    • If you reply no, or n, you receive a prompt asking to confirm the migration for each deployment:

      Migrate non-persistent deployment cmtool-helloworld5.war?
yes/no?

      • If you reply no, or n, the deployment is not migrated.

      • If you reply yes, or y, the deployment is migrated.

    INFO  Non-persistent deployment cmtool-helloworld5.war migrated.

If you run the migration tool in non-interactive mode, the JBoss Server Migration Tool will migrate or not migrate all deployments found, depending on the environment configuration. Persistent deployments are migrated only if none of the following environment properties is set as true:

  • deployments.migrate-deployments.skip

  • deployments.migrate-deployment-scanner-deployments.skip

Migrate Deployment Overlays

The migration of deployment overlays is a fully automated process. The migration tool searches for deployment overlays referenced in the standalone server configuration. It then migrates those that are linked to deployments that were migrated.

The migration tool prints a message to the console for each deployment overlay that is migrated.

INFO  Deployment overlay overlay1 migrated.
INFO  Deployment overlay overlay2 migrated.

4. Managed Domain Migration

4.1. Managed Domain Processing Overview

When tasked to migrate managed domains, the JBoss Server Migration Tool migrates the domain and host configuration files and their related domain content from the source server to the target server. This migration task is optional.

If you run the migration tool in interactive mode, which is the default, you are prompted to confirm its execution.

Migrate the source's managed domain?
yes/no?

  • If you reply with yes or y, the domain migration proceeds.

  • If you reply with no or n, the domain migration is skipped.

If you choose to proceed, the tool begins migrating the domain content of the source server. A cyphered repository used to store data, such as deployments and deployment overlays, that are referenced by the source server’s domain and host configurations. Because the source and target servers use a similar content repository, the migration of this data merely consists of finding and copying the content between the servers.

 INFO  --- Migrating managed domain...

 INFO  Source's domain content migrated.

Next, the migration tool scans the source server for domain configuration files and prints the results in the console.

 INFO  Source's domain configurations found: [cmtool-domain.xml, domain.xml]

If you run the migration tool non-interactive mode, the JBoss Server Migration Tool migrates all listed domain configuration files.

If you run the migration tool in interactive mode, which is the default, you are presented with the following prompt.

Migrate all configurations?
yes/no?

  • If you reply with yes, all listed configuration files are migrated.

  • If you reply with no, you are prompted to confirm the migration for each listed configuration file:

    Migrate configuration cmtool-domain.xml ?
yes/no? y

Next, the migration tool scans the source server for host configurations files and prints the results in the console.

 INFO  Source's host configurations found: [host-master.xml, host-slave.xml, host.xml]

If you run the migration tool in non-interactive mode, the JBoss Server Migration Tool migrates all listed host configuration files.

If you run the migration tool in interactive mode, which is the default, you are presented with the following prompt.

Migrate all configurations?
yes/no?

  • If you reply with yes, all listed configuration files are migrated.

  • If you reply with no, you are prompted to confirm the migration for each listed configuration file:

    Migrate configuration host-master.xml ?
yes/no? y

4.2. Customizing the Migration of the Managed Domain Configuration

Managed domain migration can be customized by configuring the following environment properties:

Property Name Property Description

domain.skip

If set to true, the tool skips the entire domain migration.

server.source.domain.domainDir

Defines an alternative path for the source server’s domain directory. Please note that a non absolute path is considered relative to the source server’s base directory, and if not defined this property defaults to "domain".

server.source.domain.configDir

Defines an alternative path for the source server’s domain configuration directory. Please note that a non absolute path is considered relative to the source server’s domain directory, and if not defined this property defaults to "configuration".

server.source.domain.hostConfigFiles

Specifies a comma delimited list of the file names of the source server host configurations that are to be migrated.

server.target.domain.domainDir

Defines an alternative path for the target server’s domain directory. Please note that a non absolute path is considered relative to the target server’s base directory, and if not defined this property defaults to "domain".

server.target.domain.configDir

Defines an alternative path for the target server’s domain configuration directory. Please note that a non absolute path is considered relative to the target server’s domain directory, and if not defined this property defaults to "configuration".

The environment configuration may be done in one of the following ways:

  • You can configure the tool’s config/environment.properties properties file:

domain.skip=false
server.source.domain.domainDir=domain
server.source.domain.configDir=configuration
server.source.domain.domainConfigFiles=domain.xml
server.source.domain.hostConfigFiles=host-master.xml, host.xml
server.target.domain.domainDir=domain
server.target.domain.configDir=configuration

  • You can configure the properties in your own custom properties file and pass the file on the command line using the --environment argument.

  • You can pass the information on the command line using system properties. In this case, all environment property names should be prefixed with jboss.server.migration..

4.3. Domain Configuration File Migration

When migrating the domain configuration, the JBoss Server Migration Tool first copies the source configuration files to the target server. It then updates the configuration to not only work correctly in the target server, but also to take advantage of the target server’s new functionality.

4.3.1. Remove Unsupported Subsystems

All subsystems, and related extensions, which are not supported by WildFly 12.0, are automatically removed from a migrated configuration.

Note
 A subsystem installed in WildFly 9.0 by the user, is also considered as unsupported by WildFly 12.0, and by default will not be migrated.

The console logs the configuration namespaces, and extension modules, of unsupported subsystems removed from the server configuration being migrated:

 INFO  Unsupported extensions removed: [com.example.extension1]
 INFO  Unsupported subsystems removed: [urn:example:domain:subsystem1:1.0]

It is possible to override the default behaviour and indicate subsystems and extensions which should always, or never, be migrated, by configuring the following environment properties:

Property Name Property Description

extensions.excludes

A list with the module names of extensions that should never be migrated.

extensions.includes

A list with the module names of extensions that should always be migrated.

subsystems.excludes

A list with the XML Namespaces, without the version part, of subsystems that should never be migrated.

subsystems.includes

A list with the XML Namespaces, without the version part, of subsystems that should always be migrated.

The environment configuration can be customized in one of the following ways:

  • You can configure the properties in the tool’s config/environment.properties file:

    extensions.excludes=com.example.extension1
extensions.includes=com.example.extension2,com.example.extension3
subsystems.excludes=urn:example:domain:subsystem1
subsystems.includes=urn:example:domain:subsystem2,urn:example:domain:subsystem3

  • You can include the above properties in your own custom properties file, and then pass the file on the command line using the --environment argument.

  • You can pass the information on the command line using a system property. The environment property names must be prefixed with jboss.server.migration., for example:

    -Djboss.server.migration.extensions.excludes="com.example.extension1" -Djboss.server.migration.subsystems.excludes="urn:example:domain:subsystem1"

4.3.2. Migrate Referenced Modules

A migrated configuration may reference and depend on a module that is not installed on the target server. The tool automatically migrates the referenced modules, and their dependent modules as well.

A module is migrated when it is referenced by:

  • A security-realm configuration, as plug-in(s) module

  • A datasource subsystem configuration, as datasource driver(s) module

  • An ee subsystem configuration, as a global module

  • A naming subsystem configuration, as an Object Factory module

  • A messaging subsystem configuration, as JMS Bridge module

  • A vault configuration

  • An extension not installed in the target server

The console logs a message noting the module ID for any module that is migrated, for example:

INFO  Module cmtool.security-realms:main migrated.
INFO  Module cmtool.datasources:main migrated.
INFO  Module cmtool.ee1:main migrated.
INFO  Module cmtool.ee2:main migrated.
INFO  Module cmtool.naming:main migrated.
Tip
 It is possible to exclude the migration of specific modules by specifying the id(s) in the environment property named modules.excludes.

4.3.3. Migrate Referenced Paths

A migrated configuration may reference paths, i.e. files and directories, which may need to be migrated to the target server.

A referenced path is migrated only if it’s not an absolute path, and such migration consists in copying the resource to such path, but relative to the migrated configuration, in the target server.

The tools automatically migrates the following paths references:

  • Vault keystore and encrypted file’s directory.

The console logs a message noting the migrations of paths:

 INFO  Referenced paths migrated.

If you prefer, you can configure the environment properties to customize the migration of referenced paths.

Property Name Property Description

paths.migrate-paths-requested-by-configuration.vault.skip

If set to true, the tool skips the migration of Vault referenced paths.

4.3.4. Migrate messaging Subsystem

The messaging subsystem is deprecated in WildFly 12.0 and is replaced by the messaging-activemq subsystem.

By default, the JBoss Server Migration Tool automatically migrates any legacy subsystem configuration found. If you prefer this migration task is not executed, you can set the subsystem.messaging.migrate.skip environment property value to true.

The legacy subsystem migration is done without requiring any interaction from the user.

The outcome of the legacy messaging subsystem migration is printed in the console, as an example:

 INFO  Subsystem messaging migrated.

Any issues encountered during the migration are written to the log files and displayed in the migration console.

4.3.5. Update the infinispan Subsystem

The JBoss Server Migration Tool makes the following updates to the infinispan subsystem configuration to better match the WildFly 12.0 default configurations.

  • Fixes the module name in the hibernate cache configuration.

  • Adds concurrent cache to the web cache container, which is present in the WildFly 12.0 default configuration.

By default, the tool automatically updates any infinispan subsystem configuration to include these changes. If you prefer, you can configure the environment properties to customize the process of updating the infinispan subsystem configuration.

Property Name Property Description

subsystem.infinispan.update.skip

If set to true, the tool skips the update of the infinispan subsystem.

subsystem.infinispan.update.fix-hibernate-cache-module-name.skip

If set to true, the tool does not fix the module name in the hibernate cache configuration.

subsystem.infinispan.update.update-infinispan-web-cache.skip

If set to true, the tool does not adds concurrent cache to the web cache container.

Upon successful migration of a infinispan subsystem configuration, you should see the following message in the console:

 INFO  Subsystem infinispan updated.

4.3.6. Update the undertow Subsystem

The JBoss Server Migration Tool applies the following changes to undertow subsystem configurations.

  • Sets the default HTTPS listener.

  • Adds support for HTTP2.

  • Sets the default Server response header.

  • Sets the default HTTP Invoker.

By default, the tool automatically updates any undertow subsystem configuration to include these changes. If you prefer, you can configure the environment properties to customize the process of updating the undertow subsystem configuration.

Property Name Property Description

subsystem.undertow.update.skip

If set to true, the tool skips the update of the undertow subsystem.

subsystem.undertow.update.add-undertow-https-listener.skip

If set to true, the tool does not sets the default HTTPS listener.

subsystem.undertow.update.enable-http2.skip

If set to true, the tool does not add support for HTTP2.

subsystem.undertow.update.add-response-header.server-header.skip

If set to true, the tool does not set the default Server response header.

subsystem.undertow.update.add-http-invoker.skip

If set to true, the tool does not sets the default HTTP Invoker.

Upon successful migration of a undertow subsystem configuration, you should see the following message in the console:

 INFO  Subsystem undertow updated.

4.3.7. Add the batch-jberet Subsystem

The WildFly 12.0 batch-jberet subsystem provides support for JSR 352: Batch Applications for the Java Platform.

Its default configuration is automatically added to the migrated configuration file, unless the environment property named subsystem.batch-jberet.add.skip is set to true.

The subsystem and related extension are added without any interaction required by the user. Upon successful addition of the batch-jberet subsystem configuration, you should see the following messages in the console:

 INFO  Subsystem batch-jberet added.

4.3.8. Add the core-management Subsystem

The WildFly 12.0 core-management subsystem provides WildFly Core management-related resources, which previously were configured on its kernel, for instance the server configuration’s changes history feature.

Its default configuration is automatically added to the migrated configuration file, unless the environment property named subsystem.core-management.add.skip is set to true.

The subsystem and related extension are added without any interaction required by the user. Upon successful addition of the core-management subsystem configuration, you should see the following messages in the console:

 INFO  Subsystem core-management added.

4.3.9. Add the elytron Subsystem

The WildFly 12.0 elytron subsystem provides Elytron, a new security framework, which will completely replace the combination of PicketBox and JAAS as the unified client and server security mechanism.

Its default configuration is automatically added to the migrated configuration file, unless the environment property named subsystem.elytron.add.skip is set to true.

The subsystem and related extension are added without any interaction required by the user. Upon successful addition of the elytron subsystem configuration, you should see the following messages in the console:

 INFO  Subsystem elytron added.

4.3.10. Add the singleton Subsystem

As its name indicates, the WildFly 12.0 singleton subsystem provides the singleton functionality.

Its default configuration is automatically added to the migrated configuration file, unless the environment property named subsystem.singleton.add.skip is set to true.

The subsystem and related extension are added without any interaction required by the user. Upon successful addition of the singleton subsystem configuration, you should see the following messages in the console:

 INFO  Subsystem singleton added.

4.3.11. Update the Domain Configuration’s Unsecure Interface

The tool updates the unsecure interface configuration to match WildFly 12.0 default configurations.

By default, the tool automatically updates the unsecure interface configuration. If you prefer, you can set the interface.unsecure.update.skip environment property to true to skip the automatic update of the unsecure interface.

Upon successful update of the unsecure interface configuration, you should see the following messages in the console:

 INFO  Interface unsecure updated.

4.3.12. Set Up Private Interface

The WildFly 12.0 default configuration uses a new private interface on all jgroups socket bindings. The JBoss Server Migration Tool automatically adds the new interface to migrated configurations with jgroups socket bindings, and updates these to use it.

Upon successful configuration of the private interface, you should see the following messages in the console:

 INFO  Interface private added.

If you prefer to skip the configuration of the private interface, set the environment property named interface.private.setup.skip to true.

4.3.13. Add Socket Binding Multicast Address Expressions

The WildFly 12.0 default configurations uses value expressions in the multicast-address attribute of modcluster socket bindings, and the migration tool automatically adds such value expressions to migrated configurations.

The following message(s) in the console indicates the configuration update:

INFO  Socket binding's multicast address expressions added.
Note
 The Migration Environment may be configured to skip this specific task, by setting environment property named socket-bindings.multicast-address.add-expressions.skip as true.

4.3.14. Remove Permgen Attributes From JVM Configurations

The usage of Permgen attributes in JVM configurations is deprecated in WildFly 12.0 and the JBoss Migration Tool removes these from all JVM configurations.

Upon successful removal of the Permgen attributes, you should see the following messages in the console:

INFO  JVM's permgen attributes removed.

If you prefer, you can set the jvms.remove-permgen-attributes.skip environment property value to true to skip the automatic removal.

4.3.15. Add Load Balancer Profile

WildFly 12.0 includes a new default profile, specially tailored for hosts servings as load balancers, and the migration tool automatically configures such profile in all migrated domain configurations.

INFO  Profile load-balancer added.
Note
 The Migration Environment may be configured to skip this configuration update, by setting environment property named profile.load-balancer.add.skip as true.

4.3.16. Add Host Excludes

A WildFly 12.0 domain controller may have functionality that is not supported by hosts running on older version, and it’s through its "host-excludes" configuration that such functionality is filtered.

The JBoss Migration Tool, when migrating a domain controller configuration, will add/replace the source’s "host-excludes" configuration, with the target’s one.

The configuration changes are fully automated, and upon successful completion of the configuration, you should see the following messages in the console:

  INFO  Host-excludes configuration added.

4.3.17. Migrate Deployments

The JBoss Server Migration Tool, when migrating a configuration, may also migrate:

  • Deployments it references, also known as persistent deployments.

  • Deployment Overlays it references.

Warning
 The migration of a deployment or deployment overlay merely consists of installing related file resources on the target server, and possibly updating the migrated configuration. The tool will not assert if these resources are compatible with the target server, which means that a migrated deployment might not work as expected, or might not work at all. Red Hat recommends that you use Red Hat Application Migration Toolkit to analyze a deployment with respect to compatibility among different JBoss servers.
Note
 If you run the migration tool in non-interactive mode, by default the JBoss Server Migration Tool will not migrate any deployments and overlays. To migrate deployments the environment property deployments.migrate-deployments.skip should be set as false.
Migrate Persistent Deployments

When migrating a configuration, the tool searches for references to deployments persisted in the source server, and prints the names of the deployments found in the console, e.g.:

INFO  Persistent deployments found: [cmtool-helloworld3.war, cmtool-helloworld4.war, cmtool-helloworld2.war, cmtool-helloworld1.war]

If you run the migration tool in interactive mode, you then see the following prompt:

This tool is not able to assert if persistent deployments found are compatible with the target server, skip persistent deployments migration?
yes/no?

  • If you reply yes, or y, the all deployment references are removed from the migrated configuration, i.e. the deployments will not be migration.

  • If you reply no, or n, you receive an additional prompt asking if all deployments should be the migrated:

    Migrate all persistent deployments found?
yes/no?

    • If you reply yes, or y, all deployments are migrated.

    • If you reply no, or n, you receive a prompt asking to confirm the migration for each referenced deployment:

      Migrate persistent deployment 'cmtool-helloworld3.war'?
yes/no?

      • If you reply yes, or y, the deployment is migrated.

      • If you reply no, or n, the deployment reference is removed from the migrated configuration, i.e. the deployment is not migrated.

        INFO  Persistent deployment cmtool-helloworld3.war migrated.

If you run the migration tool in non-interactive mode, the JBoss Server Migration Tool will migrate or not migrate all persistent deployments, depending on the environment configuration. Persistent deployments are migrated only if none of the following environment properties is set as true:

  • deployments.migrate-deployments.skip

  • deployments.migrate-persistent-deployments.skip

Migrate Deployment Overlays

The migration of deployment overlays is a fully automated process. The migration tool searches for deployment overlays referenced in the standalone server configuration. It then migrates those that are linked to deployments that were migrated.

The migration tool prints a message to the console for each deployment overlay that is migrated.

INFO  Deployment overlay overlay1 migrated.
INFO  Deployment overlay overlay2 migrated.

4.4. Host Configuration File Migration

When migrating the host configuration, the JBoss Server Migration Tool first copies the source configuration files to the target server. It then updates the configuration to not only work correctly in the target server, but also to take advantage of the target server’s new functionality.

4.4.1. Migrate Referenced Modules

A migrated configuration may reference and depend on a module that is not installed on the target server. The tool automatically migrates the referenced modules, and their dependent modules as well.

A module is migrated when it is referenced by:

  • A security-realm configuration, as plug-in(s) module

The console logs a message noting the module ID for any module that is migrated, for example:

INFO  Module cmtool.security-realms:main migrated.
Tip
 It is possible to exclude the migration of specific modules by specifying the id(s) in the environment property named modules.excludes.

4.4.2. Migrate Referenced Paths

A migrated configuration may reference paths, i.e. files and directories, which may need to be migrated to the target server.

A referenced path is migrated only if it’s not an absolute path, and such migration consists in copying the resource to such path, but relative to the migrated configuration, in the target server.

The tools automatically migrates the following paths references:

  • Vault keystore and encrypted file’s directory.

The console logs a message noting the migrations of paths:

 INFO  Referenced paths migrated.

If you prefer, you can configure the environment properties to customize the migration of referenced paths.

Property Name Property Description

paths.migrate-paths-requested-by-configuration.vault.skip

If set to true, the tool skips the migration of Vault referenced paths.

4.4.3. Add the core-management Subsystem

The WildFly 12.0 core-management subsystem provides WildFly Core management-related resources, which previously were configured on its kernel, for instance the server configuration’s changes history feature.

Its default configuration is automatically added to the migrated configuration file, unless the environment property named subsystem.core-management.add.skip is set to true.

The subsystem and related extension are added without any interaction required by the user. Upon successful addition of the core-management subsystem configuration, you should see the following messages in the console:

 INFO  Subsystem core-management added.

4.4.4. Add the elytron Subsystem

The WildFly 12.0 elytron subsystem provides Elytron, a new security framework, which will completely replace the combination of PicketBox and JAAS as the unified client and server security mechanism.

Its default configuration is automatically added to the migrated configuration file, unless the environment property named subsystem.elytron.add.skip is set to true.

The subsystem and related extension are added without any interaction required by the user. Upon successful addition of the elytron subsystem configuration, you should see the following messages in the console:

 INFO  Subsystem elytron added.

4.4.5. Remove the Unsecure Interface

The tool removes the unsecure interface configuration from migrated configurations, to match the WildFly 12.0 default configurations. However, you can configure the tool to skip the removal of the unsecure interface by setting the interface.unsecure.remove.skip environment property value to true.

Upon successful removal of the unsecure interface configuration, you should see the following message in the console:

 INFO  Interface unsecure removed.

4.4.6. Remove Permgen Attributes From JVM Configurations

The usage of Permgen attributes in JVM configurations is deprecated in WildFly 12.0 and the JBoss Migration Tool removes these from all JVM configurations.

Upon successful removal of the Permgen attributes, you should see the following messages in the console:

INFO  JVM's permgen attributes removed.

If you prefer, you can set the jvms.remove-permgen-attributes.skip environment property value to true to skip the automatic removal.

4.4.7. Migrate Compatible Security Realms

Because the WildFly 12.0 security realms configuration is fully compatible with the WildFly 9.0 security realms configuration, they require no update by the JBoss Server Migration Tool. However, if the properties files are not referenced using an absolute path, the tool copies them to the path expected by the migrated configuration file.

This process is fully automated and requires no interaction by the user. To skip the security realms migration, set the security-realms.migrate-properties.skip environment property to true.

Upon successful migration of the security realms configuration, you should see the following messages in the console:

INFO  Security realms migrated.

4.4.8. Add default SSL Server Identity to ApplicationRealm

WildFly 12.0 default configurations include a SSL Server Identity for the default Security Realm named ApplicationRealm, and the migration tool automatically updates migrated configurations to match such change.

The following message(s) printed on the migration console and log(s), indicates this configuration update:

INFO  Security realm ApplicationRealm SSL server identity configured.
Note
 The Migration Environment may be configured to skip this configuration update, by setting environment property named security-realm.ApplicationRealm.add-ssl-server-identity.skip as true.