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Configuration Reference
This section is a quick index for looking up configuration. Click on the element name to go to the specific chapter.
Server Configuration
broker.xml
This is the main core server configuration file which contains to elements 'core' and 'jms'. The 'core' element contains the main server configuration while the 'jms' element is used by the server side JMS service to load JMS Queues, Topics
The core configuration
This describes the root of the XML configuration. You will see here also multiple sub-types listed. For example on the main config you will have bridges and at the list of bridge type we will describe the properties for that configuration.
| Name | Description |
|---|---|
| acceptors | a list of remoting acceptors |
| acceptors.acceptor | Each acceptor is composed for just an URL |
| address-settings | a list of address-setting |
| allow-failback | Should stop backup on live restart. default true |
| async-connection-execution-enabled | If False delivery would be always asynchronous. default true |
| bindings-directory | The folder in use for the bindings folder |
| bridges | a list of bridge |
| broadcast-groups | a list of broadcast-group |
| configuration-file-refresh-period | The frequency in milliseconds the configuration file is checked for changes (default 5000) |
| check-for-live-server | Used for a live server to verify if there are other nodes with the same ID on the topology |
| cluster-connections | a list of cluster-connection |
| cluster-password | Cluster password. It applies to all cluster configurations. |
| cluster-user | Cluster username. It applies to all cluster configurations. |
| connection-ttl-override | if set, this will override how long (in ms) to keep a connection alive without receiving a ping. -1 disables this setting. Default -1 |
| connection-ttl-check-period | how often (in ms) to check connections for ttl violation. Default 2000 |
| connectors.connector | The URL for the connector. This is a list |
| create-bindings-dir | true means that the server will create the bindings directory on start up. Default=true |
| create-journal-dir | true means that the journal directory will be created. Default=true |
| discovery-groups | a list of discovery-group |
| disk-scan-period | The interval where the disk is scanned for percentual usage. Default=5000 ms. |
| diverts | a list of diverts to use |
| global-max-size | The amount in bytes before all addresses are considered full |
| graceful-shutdown-enabled | true means that graceful shutdown is enabled. Default=true |
| graceful-shutdown-timeout | Timeout on waitin for clients to disconnect before server shutdown. Default=-1 |
| grouping-handler | Message Group configuration |
| id-cache-size | The duplicate detection circular cache size. Default=20000 |
| jmx-domain | the JMX domain used to registered MBeans in the MBeanServer. Default=org.apache.activemq |
| jmx-management-enabled | true means that the management API is available via JMX. Default=true |
| journal-buffer-size | The size of the internal buffer on the journal in KB. Default=490 KiB |
| journal-buffer-timeout | The Flush timeout for the journal buffer |
| journal-compact-min-files | The minimal number of data files before we can start compacting. Setting this to 0 means compacting is disabled. Default=10 |
| journal-compact-percentage | The percentage of live data on which we consider compacting the journal. Default=30 |
| journal-directory | the directory to store the journal files in. Default=data/journal |
| journal-file-size | the size (in bytes) of each journal file. Default=10485760 (10 MB) |
| journal-max-io | the maximum number of write requests that can be in the AIO queue at any one time. Default is 500 for AIO and 1 for NIO. |
| journal-min-files | how many journal files to pre-create. Default=2 |
| journal-pool-files | The upper theshold of the journal file pool,-1 (default) means no Limit. The system will create as many files as needed however when reclaiming files it will shrink back to the journal-pool-files |
| journal-sync-non-transactional | if true wait for non transaction data to be synced to the journal before returning response to client. Default=true |
| journal-sync-transactional | if true wait for transaction data to be synchronized to the journal before returning response to client. Default=true |
| journal-type | the type of journal to use. Default=ASYNCIO |
| journal-datasync | It will use fsync on journal operations. Default=true. |
| large-messages-directory | the directory to store large messages. Default=data/largemessages |
| management-address | the name of the management address to send management messages to. It is prefixed with "jms.queue" so that JMS clients can send messages to it. Default=jms.queue.activemq.management |
| management-notification-address | the name of the address that consumers bind to receive management notifications. Default=activemq.notifications |
| mask-password | This option controls whether passwords in server configuration need be masked. If set to "true" the passwords are masked. Default=false |
| max-saved-replicated-journals-size | This specifies how many times a replicated backup server can restart after moving its files on start. Once there are this number of backup journal files the server will stop permanently after if fails back. -1 Means no Limit, 0 don't keep a copy at all, Default=2 |
| max-disk-usage | The max percentage of data we should use from disks. The System will block while the disk is full. Default=100 |
| memory-measure-interval | frequency to sample JVM memory in ms (or -1 to disable memory sampling). Default=-1 |
| memory-warning-threshold | Percentage of available memory which will trigger a warning log. Default=25 |
| message-counter-enabled | true means that message counters are enabled. Default=false |
| message-counter-max-day-history | how many days to keep message counter history. Default=10 (days) |
| message-counter-sample-period | the sample period (in ms) to use for message counters. Default=10000 |
| message-expiry-scan-period | how often (in ms) to scan for expired messages. Default=30000 |
| message-expiry-thread-priority | the priority of the thread expiring messages. Default=3 |
| page-max-concurrent-io | The max number of concurrent reads allowed on paging. Default=5 |
| paging-directory | the directory to store paged messages in. Default=data/paging |
| persist-delivery-count-before-delivery | True means that the delivery count is persisted before delivery. False means that this only happens after a message has been cancelled. Default=false |
| persistence-enabled | true means that the server will use the file based journal for persistence. Default=true |
| persist-id-cache | true means that ID's are persisted to the journal. Default=true |
| queues | a list of queue to be created |
| remoting-incoming-interceptors | A list of interceptor |
| resolveProtocols | Use ServiceLoader to load protocol modules. Default=true |
| scheduled-thread-pool-max-size | Maximum number of threads to use for the scheduled thread pool. Default=5 |
| security-enabled | true means that security is enabled. Default=true |
| security-invalidation-interval | how long (in ms) to wait before invalidating the security cache. Default=10000 |
| populate-validated-user | whether or not to add the name of the validated user to the messages that user sends. Default=false |
| security-settings | a list of security-setting |
| thread-pool-max-size | Maximum number of threads to use for the thread pool. -1 means 'no limits'.. Default=30 |
| transaction-timeout | how long (in ms) before a transaction can be removed from the resource manager after create time. Default=300000 |
| transaction-timeout-scan-period | how often (in ms) to scan for timeout transactions. Default=1000 |
| wild-card-routing-enabled | true means that the server supports wild card routing. Default=true |
#address-setting type
| Name | Description |
|---|---|
| match | The filter to apply to the setting |
| dead-letter-address | dead letter address |
| expiry-address | expired messages address |
| expiry-delay | expiration time override, -1 don't override with default=-1 |
| redelivery-delay | time to redeliver a message (in ms) with default=0 |
| redelivery-delay-multiplier | multiplier to apply to the "redelivery-delay" |
| max-redelivery-delay | Max value for the redelivery-delay |
| max-delivery-attempts | Number of retries before dead letter address, default=10 |
| max-size-bytes | Limit before paging. -1 = infinite |
| page-size-bytes | Size of each file on page, default=10485760 |
| page-max-cache-size | Maximum number of files cached from paging default=5 |
| address-full-policy | Model to chose after queue full |
| message-counter-history-day-limit | Days to keep in history |
| last-value-queue | Queue is a last value queue, default=false |
| redistribution-delay | Timeout before redistributing values after no consumers. default=-1 |
| send-to-dla-on-no-route | Forward messages to DLA when no queues subscribing. default=false |
#bridge type
| Name | Description |
|---|---|
| name | unique name |
| queue-name | name of queue that this bridge consumes from |
| forwarding-address | address to forward to. If omitted original address is used |
| ha | whether this bridge supports fail-over |
| filter | optional core filter expression |
| transformer-class-name | optional name of transformer class |
| min-large-message-size | Limit before message is considered large. default 100KB |
| check-period | TTL check period for the bridge. -1 means disabled. default 30000 (ms) |
| connection-ttl | TTL for the Bridge. This should be greater than the ping period. default 60000 (ms) |
| retry-interval | period (in ms) between successive retries. default 2000 |
| retry-interval-multiplier | multiplier to apply to successive retry intervals. default 1 |
| max-retry-interval | Limit to the retry-interval growth. default 2000 |
| reconnect-attempts | maximum number of retry attempts, -1 means 'no limits'. default -1 |
| use-duplicate-detection | forward duplicate detection headers?. default true |
| confirmation-window-size | number of bytes before confirmations are sent. default 1MB |
| producer-window-size | Producer flow control size on the bridge. Default -1 (disabled) |
| user | Username for the bridge, the default is the cluster username |
| password | Password for the bridge, default is the cluster password |
| reconnect-attempts-same-node | Number of retries before trying another node. default 10 |
broadcast-group type
| Name | Type |
|---|---|
| name | unique name |
| local-bind-address | local bind address that the datagram socket is bound to |
| local-bind-port | local port to which the datagram socket is bound to |
| group-address | multicast address to which the data will be broadcast |
| group-port | UDP port number used for broadcasting |
| broadcast-period | period in milliseconds between consecutive broadcasts. default 2000 |
| jgroups-file | Name of JGroups configuration file |
| jgroups-channel | Name of JGroups Channel |
| connector-ref |
#cluster-connection type
| Name | Description |
|---|---|
| name | unique name |
| address | name of the address this cluster connection applies to |
| connector-ref | Name of the connector reference to use. |
| check-period | The period (in milliseconds) used to check if the cluster connection has failed to receive pings from another server with default = 30000 |
| connection-ttl | Timeout for TTL. Default 60000 |
| min-large-message-size | Messages larger than this are considered large-messages, default=100KB |
| call-timeout | Time(ms) before giving up on blocked calls. Default=30000 |
| retry-interval | period (in ms) between successive retries. Default=500 |
| retry-interval-multiplier | multiplier to apply to the retry-interval. Default=1 |
| max-retry-interval | Maximum value for retry-interval. Default=2000 |
| reconnect-attempts | How many attempts should be made to reconnect after failure. Default=-1 |
| use-duplicate-detection | should duplicate detection headers be inserted in forwarded messages?. Default=true |
| message-load-balancing | how should messages be load balanced? Default=OFF |
| max-hops | maximum number of hops cluster topology is propagated. Default=1 |
| confirmation-window-size | The size (in bytes) of the window used for confirming data from the server connected to. Default 1048576 |
| producer-window-size | Flow Control for the Cluster connection bridge. Default -1 (disabled) |
| call-failover-timeout | How long to wait for a reply if in the middle of a fail-over. -1 means wait forever. Default -1 |
| notification-interval | how often the cluster connection will notify the cluster of its existence right after joining the cluster. Default 1000 |
| notification-attempts | how many times this cluster connection will notify the cluster of its existence right after joining the cluster Default 2 |
#discovery-group type
| Name | Description |
|---|---|
| name | unique name |
| group-address | Multicast IP address of the group to listen on |
| group-port | UDP port number of the multi cast group |
| jgroups-file | Name of a JGroups configuration file. If specified, the server uses JGroups for discovery. |
| jgroups-channel | Name of a JGroups Channel. If specified, the server uses the named channel for discovery. |
| refresh-timeout | Period the discovery group waits after receiving the last broadcast from a particular server before removing that servers connector pair entry from its list. Default=10000 |
| local-bind-address | local bind address that the datagram socket is bound to |
| local-bind-port | local port to which the datagram socket is bound to. Default=-1 |
| initial-wait-timeout | time to wait for an initial broadcast to give us at least one node in the cluster. Default=10000 |
#divert type
| Name | Description |
|---|---|
| name | unique name |
| transformer-class-name | an optional class name of a transformer |
| exclusive | whether this is an exclusive divert. Default=false |
| routing-name | the routing name for the divert |
| address | the address this divert will divert from |
| forwarding-address | the forwarding address for the divert |
| filter | optional core filter expression |
#queue type
| Name | Description |
|---|---|
| name | unique name |
| address | address for the queue |
| filter | optional core filter expression |
| durable | whether the queue is durable (persistent). Default=true |
#security-setting type
| Name | Description |
|---|---|
| match | address expression |
| permission | |
| permission.type | the type of permission |
| permission.roles | a comma-separated list of roles to apply the permission to |
##The jms configuration
| Name | Type | Description |
|---|---|---|
| queue | Queue | a queue |
| queue.name (attribute) | String | unique name of the queue |
| queue.durable | Boolean | is the queue durable?. Default=true |
| queue.filter | String | optional filter expression for the queue |
| topic | Topic | a topic |
| topic.name (attribute) | String | unique name of the topic |
Using Masked Passwords in Configuration Files
By default all passwords in Apache ActiveMQ Artemis server's configuration files are in plain text form. This usually poses no security issues as those files should be well protected from unauthorized accessing. However, in some circumstances a user doesn't want to expose its passwords to more eyes than necessary.
Apache ActiveMQ Artemis can be configured to use 'masked' passwords in its configuration files. A masked password is an obscure string representation of a real password. To mask a password a user will use an 'encoder'. The encoder takes in the real password and outputs the masked version. A user can then replace the real password in the configuration files with the new masked password. When Apache ActiveMQ Artemis loads a masked password, it uses a suitable 'decoder' to decode it into real password.
Apache ActiveMQ Artemis provides a default password encoder and decoder. Optionally users can use or implement their own encoder and decoder for masking the passwords.
Password Masking in Server Configuration File
The password masking property
The server configuration file has a property that defines the default masking behaviors over the entire file scope.
mask-password: this boolean type property indicates if a password
should be masked or not. Set it to "true" if you want your passwords
masked. The default value is "false".
Specific masking behaviors
cluster-password
The nature of the value of cluster-password is subject to the value of property 'mask-password'. If it is true the cluster-password is masked.
Passwords in connectors and acceptors
In the server configuration, Connectors and Acceptors sometimes needs to specify passwords. For example if a users wants to use an SSL-enabled NettyAcceptor, it can specify a key-store-password and a trust-store-password. Because Acceptors and Connectors are pluggable implementations, each transport will have different password masking needs.
When a Connector or Acceptor configuration is initialised, Apache ActiveMQ Artemis will
add the "mask-password" and "password-codec" values to the Connector or
Acceptors params using the keys activemq.usemaskedpassword and
activemq.passwordcodec respectively. The Netty and InVM
implementations will use these as needed and any other implementations
will have access to these to use if they so wish.
Passwords in Core Bridge configurations
Core Bridges are configured in the server configuration file and so the masking of its 'password' properties follows the same rules as that of 'cluster-password'.
Examples
The following table summarizes the relations among the above-mentioned properties
| mask-password | cluster-password | acceptor/connector passwords | bridge password |
|---|---|---|---|
| absent | plain text | plain text | plain text |
| false | plain text | plain text | plain text |
| true | masked | masked | masked |
Examples
Note: In the following examples if related attributed or properties are absent, it means they are not specified in the configure file.
example 1
<cluster-password>bbc</cluster-password>
This indicates the cluster password is a plain text value ("bbc").
example 2
<mask-password>true</mask-password>
<cluster-password>80cf731af62c290</cluster-password>
This indicates the cluster password is a masked value and Apache ActiveMQ Artemis will use its built-in decoder to decode it. All other passwords in the configuration file, Connectors, Acceptors and Bridges, will also use masked passwords.
JMS Bridge password masking
The JMS Bridges are configured and deployed as separate beans so they need separate configuration to control the password masking. A JMS Bridge has two password parameters in its constructor, SourcePassword and TargetPassword. It uses the following two optional properties to control their masking:
useMaskedPassword -- If set to "true" the passwords are masked.
Default is false.
passwordCodec -- Class name and its parameters for the Decoder used to
decode the masked password. Ignored if useMaskedPassword is false. The
format of this property is a full qualified class name optionally
followed by key/value pairs, separated by semi-colons. For example:
<property name="useMaskedPassword">true</property>
<property name="passwordCodec">com.foo.FooDecoder;key=value</property>
Apache ActiveMQ Artemis will load this property and initialize the class with a
parameter map containing the "key"->"value" pair. If passwordCodec is
not specified, the built-in decoder is used.
Masking passwords in ActiveMQ Artemis ResourceAdapters and MDB activation configurations
Both ra.xml and MDB activation configuration have a 'password' property that can be masked. They are controlled by the following two optional Resource Adapter properties in ra.xml:
UseMaskedPassword -- If setting to "true" the passwords are masked.
Default is false.
PasswordCodec -- Class name and its parameters for the Decoder used to
decode the masked password. Ignored if UseMaskedPassword is false. The
format of this property is a full qualified class name optionally
followed by key/value pairs. It is the same format as that for JMS
Bridges. Example:
<config-property>
<config-property-name>UseMaskedPassword</config-property-name>
<config-property-type>boolean</config-property-type>
<config-property-value>true</config-property-value>
</config-property>
<config-property>
<config-property-name>PasswordCodec</config-property-name>
<config-property-type>java.lang.String</config-property-type>
<config-property-value>com.foo.ADecoder;key=helloworld</config-property-value>
</config-property>
With this configuration, both passwords in ra.xml and all of its MDBs will have to be in masked form.
Masking passwords in artemis-users.properties
Apache ActiveMQ Artemis's built-in security manager uses plain properties files where the user passwords are specified in hash forms by default.
Please use Artemis CLI command to add a password. For example
./artemis user add --username guest --password guest --role admin
Choosing a decoder for password masking
As described in the previous sections, all password masking requires a decoder. A decoder uses an algorithm to convert a masked password into its original clear text form in order to be used in various security operations. The algorithm used for decoding must match that for encoding. Otherwise the decoding may not be successful.
For user's convenience Apache ActiveMQ Artemis provides a default built-in Decoder. However a user can if they so wish implement their own.
The built-in Decoder
Whenever no decoder is specified in the configuration file, the built-in decoder is used. The class name for the built-in decoder is org.apache.activemq.artemis.utils.DefaultSensitiveStringCodec. It has both encoding and decoding capabilities. It uses java.crypto.Cipher utilities to encrypt (encode) a plaintext password and decrypt a mask string using same algorithm. Using this decoder/encoder is pretty straightforward. To get a mask for a password, just run the main class at org.apache.activemq.artemis.utils.DefaultSensitiveStringCodec.
An easy way to do it is through activemq-tools--jar-with-dependencies.jar since it has all the dependencies:
java -cp artemis-tools-1.0.0-jar-with-dependencies.jar org.apache.activemq.artemis.utils.DefaultSensitiveStringCodec "your plaintext password"
If you don't want to use the jar-with-dependencies, make sure the classpath is correct. You'll get something like
Encoded password: 80cf731af62c290
Just copy "80cf731af62c290" and replace your plaintext password with it.
Using a different decoder
It is possible to use a different decoder rather than the built-in one. Simply make sure the decoder is in Apache ActiveMQ Artemis's classpath and configure the server to use it as follows:
<password-codec>com.foo.SomeDecoder;key1=value1;key2=value2</password-codec>
If your decoder needs params passed to it you can do this via key/value pairs when configuring. For instance if your decoder needs say a "key-location" parameter, you can define like so:
<password-codec>com.foo.NewDecoder;key-location=/some/url/to/keyfile</password-codec>
Then configure your cluster-password like this:
<mask-password>true</mask-password>
<cluster-password>masked_password</cluster-password>
When Apache ActiveMQ Artemis reads the cluster-password it will initialize the NewDecoder and use it to decode "mask_password". It also process all passwords using the new defined decoder.
Implementing your own codecs
To use a different decoder than the built-in one, you either pick one
from existing libraries or you implement it yourself. All decoders must
implement the org.apache.activemq.artemis.utils.SensitiveDataCodec<T>
interface:
public interface SensitiveDataCodec<T>
{
T decode(Object mask) throws Exception;
void init(Map<String, String> params);
}
This is a generic type interface but normally for a password you just need String type. So a new decoder would be defined like
public class MyNewDecoder implements SensitiveDataCodec<String>
{
public String decode(Object mask) throws Exception
{
//decode the mask into clear text password
return "the password";
}
public void init(Map<String, String> params)
{
//initialization done here. It is called right after the decoder has been created.
}
}
Last but not least, once you get your own decoder, please add it to the classpath. Otherwise Apache ActiveMQ Artemis will fail to load it!