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Chapter 2.  Managing the AMQP Messaging Broker

2.1.  Managing the C++ Broker

There are quite a few ways to interact with the C++ broker. The command line tools include:

  • qpid-route - used to configure federation (a set of federated brokers)

  • qpid-config - used to configure queues, exchanges, bindings and list them etc

  • qpid-tool - used to view management information/statistics and call any management actions on the broker

  • qpid-printevents - used to receive and print QMF events

  • qpid-ha - used to interact with the High Availability module

2.1.1.  Using qpid-config

This utility can be used to create queues exchanges and bindings, both durable and transient. Always check for latest options by running --help command.

$ qpid-config --help
Usage:  qpid-config [OPTIONS]
        qpid-config [OPTIONS] exchanges [filter-string]
        qpid-config [OPTIONS] queues    [filter-string]
        qpid-config [OPTIONS] add exchange <type> <name> [AddExchangeOptions]
        qpid-config [OPTIONS] del exchange <name>
        qpid-config [OPTIONS] add queue <name> [AddQueueOptions]
        qpid-config [OPTIONS] del queue <name>
        qpid-config [OPTIONS] bind   <exchange-name> <queue-name> [binding-key]
        qpid-config [OPTIONS] unbind <exchange-name> <queue-name> [binding-key]

Options:
    -b [ --bindings ]                         Show bindings in queue or exchange list
    -a [ --broker-addr ] Address (localhost)  Address of qpidd broker
         broker-addr is in the form:   [username/password@] hostname | ip-address [:<port>]
         ex:  localhost, 10.1.1.7:10000, broker-host:10000, guest/guest@localhost

Add Queue Options:
    --durable            Queue is durable
    --cluster-durable    Queue becomes durable if there is only one functioning cluster node
    --file-count N (8)   Number of files in queue's persistence journal
    --file-size  N (24)  File size in pages (64Kib/page)
    --max-queue-size N   Maximum in-memory queue size as bytes
    --max-queue-count N  Maximum in-memory queue size as a number of messages
    --limit-policy [none | reject | flow-to-disk | ring | ring-strict]
                         Action taken when queue limit is reached:
                             none (default) - Use broker's default policy
                             reject         - Reject enqueued messages
                             flow-to-disk   - Page messages to disk
                             ring           - Replace oldest unacquired message with new
                             ring-strict    - Replace oldest message, reject if oldest is acquired
    --order [fifo | lvq | lvq-no-browse]
                         Set queue ordering policy:
                             fifo (default) - First in, first out
                             lvq            - Last Value Queue ordering, allows queue browsing
                             lvq-no-browse  - Last Value Queue ordering, browsing clients may lose data
    --generate-queue-events N
                         If set to 1, every enqueue will generate an event that can be processed by
                         registered listeners (e.g. for replication). If set to 2, events will be
                         generated for enqueues and dequeues

Add Exchange Options:
    --durable    Exchange is durable
    --sequence   Exchange will insert a 'qpid.msg_sequence' field in the message header
                 with a value that increments for each message forwarded.
    --ive        Exchange will behave as an 'initial-value-exchange', keeping a reference
                 to the last message forwarded and enqueuing that message to newly bound
                 queues.

Get the summary page

$ qpid-config
Total Exchanges: 6
          topic: 2
        headers: 1
         fanout: 1
         direct: 2
   Total Queues: 7
        durable: 0
    non-durable: 7

List the queues

$ qpid-config queues
Queue Name                                  Attributes
=================================================================
pub_start
pub_done
sub_ready
sub_done
perftest0                                   --durable
reply-dhcp-100-18-254.bos.redhat.com.20713  auto-del excl
topic-dhcp-100-18-254.bos.redhat.com.20713  auto-del excl

List the exchanges with bindings

$ ./qpid-config -b exchanges
Exchange '' (direct)
    bind pub_start => pub_start
    bind pub_done => pub_done
    bind sub_ready => sub_ready
    bind sub_done => sub_done
    bind perftest0 => perftest0
    bind mgmt-3206ff16-fb29-4a30-82ea-e76f50dd7d15 => mgmt-3206ff16-fb29-4a30-82ea-e76f50dd7d15
    bind repl-3206ff16-fb29-4a30-82ea-e76f50dd7d15 => repl-3206ff16-fb29-4a30-82ea-e76f50dd7d15
Exchange 'amq.direct' (direct)
    bind repl-3206ff16-fb29-4a30-82ea-e76f50dd7d15 => repl-3206ff16-fb29-4a30-82ea-e76f50dd7d15
    bind repl-df06c7a6-4ce7-426a-9f66-da91a2a6a837 => repl-df06c7a6-4ce7-426a-9f66-da91a2a6a837
    bind repl-c55915c2-2fda-43ee-9410-b1c1cbb3e4ae => repl-c55915c2-2fda-43ee-9410-b1c1cbb3e4ae
Exchange 'amq.topic' (topic)
Exchange 'amq.fanout' (fanout)
Exchange 'amq.match' (headers)
Exchange 'qpid.management' (topic)
    bind mgmt.# => mgmt-3206ff16-fb29-4a30-82ea-e76f50dd7d15

2.1.2.  Using qpid-route

This utility is to create federated networks of brokers, This allows you for forward messages between brokers in a network. Messages can be routed statically (using "qpid-route route add") where the bindings that control message forwarding are supplied in the route. Message routing can also be dynamic (using "qpid-route dynamic add") where the messages are automatically forwarded to clients based on their bindings to the local broker.

$ qpid-route
Usage:  qpid-route [OPTIONS] dynamic add <dest-broker> <src-broker> <exchange> [tag] [exclude-list]
        qpid-route [OPTIONS] dynamic del <dest-broker> <src-broker> <exchange>

        qpid-route [OPTIONS] route add   <dest-broker> <src-broker> <exchange> <routing-key> [tag] [exclude-list]
        qpid-route [OPTIONS] route del   <dest-broker> <src-broker> <exchange> <routing-key>
        qpid-route [OPTIONS] queue add   <dest-broker> <src-broker> <exchange> <queue>
        qpid-route [OPTIONS] queue del   <dest-broker> <src-broker> <exchange> <queue>
        qpid-route [OPTIONS] route list  [<dest-broker>]
        qpid-route [OPTIONS] route flush [<dest-broker>]
        qpid-route [OPTIONS] route map   [<broker>]

        qpid-route [OPTIONS] link add  <dest-broker> <src-broker>
        qpid-route [OPTIONS] link del  <dest-broker> <src-broker>
        qpid-route [OPTIONS] link list [<dest-broker>]

Options:
    -v [ --verbose ]         Verbose output
    -q [ --quiet ]           Quiet output, don't print duplicate warnings
    -d [ --durable ]         Added configuration shall be durable
    -e [ --del-empty-link ]  Delete link after deleting last route on the link
    -s [ --src-local ]       Make connection to source broker (push route)
    -t <transport> [ --transport <transport>]
                             Specify transport to use for links, defaults to tcp

  dest-broker and src-broker are in the form:  [username/password@] hostname | ip-address [:<port>]
  ex:  localhost, 10.1.1.7:10000, broker-host:10000, guest/guest@localhost

A few examples:

qpid-route dynamic add host1 host2 fed.topic
qpid-route dynamic add host2 host1 fed.topic

qpid-route -v route add host1 host2 hub1.topic hub2.topic.stock.buy
qpid-route -v route add host1 host2 hub1.topic hub2.topic.stock.sell
qpid-route -v route add host1 host2 hub1.topic 'hub2.topic.stock.#'
qpid-route -v route add host1 host2 hub1.topic 'hub2.#'
qpid-route -v route add host1 host2 hub1.topic 'hub2.topic.#'
qpid-route -v route add host1 host2 hub1.topic 'hub2.global.#'

The link map feature can be used to display the entire federated network configuration by supplying a single broker as an entry point:

$ qpid-route route map localhost:10001

Finding Linked Brokers:
    localhost:10001... Ok
    localhost:10002... Ok
    localhost:10003... Ok
    localhost:10004... Ok
    localhost:10005... Ok
    localhost:10006... Ok
    localhost:10007... Ok
    localhost:10008... Ok

Dynamic Routes:

  Exchange fed.topic:
    localhost:10002 <=> localhost:10001
    localhost:10003 <=> localhost:10002
    localhost:10004 <=> localhost:10002
    localhost:10005 <=> localhost:10002
    localhost:10006 <=> localhost:10005
    localhost:10007 <=> localhost:10006
    localhost:10008 <=> localhost:10006

  Exchange fed.direct:
    localhost:10002  => localhost:10001
    localhost:10004  => localhost:10003
    localhost:10003  => localhost:10002
    localhost:10001  => localhost:10004

Static Routes:

  localhost:10003(ex=amq.direct) <= localhost:10005(ex=amq.direct) key=rkey
  localhost:10003(ex=amq.direct) <= localhost:10005(ex=amq.direct) key=rkey2

2.1.3.  Using qpid-tool

This utility provided a telnet style interface to be able to view, list all stats and action all the methods. Simple capture below. Best to just play with it and mail the list if you have questions or want features added.

qpid:
qpid: help
Management Tool for QPID
Commands:
    list                            - Print summary of existing objects by class
    list <className>                - Print list of objects of the specified class
    list <className> all            - Print contents of all objects of specified class
    list <className> active         - Print contents of all non-deleted objects of specified class
    list <list-of-IDs>              - Print contents of one or more objects (infer className)
    list <className> <list-of-IDs>  - Print contents of one or more objects
        list is space-separated, ranges may be specified (i.e. 1004-1010)
    call <ID> <methodName> <args> - Invoke a method on an object
    schema                          - Print summary of object classes seen on the target
    schema <className>              - Print details of an object class
    set time-format short           - Select short timestamp format (default)
    set time-format long            - Select long timestamp format
    quit or ^D                      - Exit the program
qpid: list
Management Object Types:
    ObjectType     Active  Deleted
    ================================
    qpid.binding   21      0
    qpid.broker    1       0
    qpid.client    1       0
    qpid.exchange  6       0
    qpid.queue     13      0
    qpid.session   4       0
    qpid.system    1       0
    qpid.vhost     1       0
qpid: list qpid.system
Objects of type qpid.system
    ID    Created   Destroyed  Index
    ==================================
    1000  21:00:02  -          host
qpid: list 1000
Object of type qpid.system: (last sample time: 21:26:02)
    Type    Element   1000
    =======================================================
    config  sysId     host
    config  osName    Linux
    config  nodeName  localhost.localdomain
    config  release   2.6.24.4-64.fc8
    config  version   #1 SMP Sat Mar 29 09:15:49 EDT 2008
    config  machine   x86_64
qpid: schema queue
Schema for class 'qpid.queue':
    Element                Type          Unit         Access      Notes   Description
    ===================================================================================================================
    vhostRef               reference                  ReadCreate  index
    name                   short-string               ReadCreate  index
    durable                boolean                    ReadCreate
    autoDelete             boolean                    ReadCreate
    exclusive              boolean                    ReadCreate
    arguments              field-table                ReadOnly            Arguments supplied in queue.declare
    storeRef               reference                  ReadOnly            Reference to persistent queue (if durable)
    msgTotalEnqueues       uint64        message                          Total messages enqueued
    msgTotalDequeues       uint64        message                          Total messages dequeued
    msgTxnEnqueues         uint64        message                          Transactional messages enqueued
    msgTxnDequeues         uint64        message                          Transactional messages dequeued
    msgPersistEnqueues     uint64        message                          Persistent messages enqueued
    msgPersistDequeues     uint64        message                          Persistent messages dequeued
    msgDepth               uint32        message                          Current size of queue in messages
    msgDepthHigh           uint32        message                          Current size of queue in messages (High)
    msgDepthLow            uint32        message                          Current size of queue in messages (Low)
    byteTotalEnqueues      uint64        octet                            Total messages enqueued
    byteTotalDequeues      uint64        octet                            Total messages dequeued
    byteTxnEnqueues        uint64        octet                            Transactional messages enqueued
    byteTxnDequeues        uint64        octet                            Transactional messages dequeued
    bytePersistEnqueues    uint64        octet                            Persistent messages enqueued
    bytePersistDequeues    uint64        octet                            Persistent messages dequeued
    byteDepth              uint32        octet                            Current size of queue in bytes
    byteDepthHigh          uint32        octet                            Current size of queue in bytes (High)
    byteDepthLow           uint32        octet                            Current size of queue in bytes (Low)
    enqueueTxnStarts       uint64        transaction                      Total enqueue transactions started
    enqueueTxnCommits      uint64        transaction                      Total enqueue transactions committed
    enqueueTxnRejects      uint64        transaction                      Total enqueue transactions rejected
    enqueueTxnCount        uint32        transaction                      Current pending enqueue transactions
    enqueueTxnCountHigh    uint32        transaction                      Current pending enqueue transactions (High)
    enqueueTxnCountLow     uint32        transaction                      Current pending enqueue transactions (Low)
    dequeueTxnStarts       uint64        transaction                      Total dequeue transactions started
    dequeueTxnCommits      uint64        transaction                      Total dequeue transactions committed
    dequeueTxnRejects      uint64        transaction                      Total dequeue transactions rejected
    dequeueTxnCount        uint32        transaction                      Current pending dequeue transactions
    dequeueTxnCountHigh    uint32        transaction                      Current pending dequeue transactions (High)
    dequeueTxnCountLow     uint32        transaction                      Current pending dequeue transactions (Low)
    consumers              uint32        consumer                         Current consumers on queue
    consumersHigh          uint32        consumer                         Current consumers on queue (High)
    consumersLow           uint32        consumer                         Current consumers on queue (Low)
    bindings               uint32        binding                          Current bindings
    bindingsHigh           uint32        binding                          Current bindings (High)
    bindingsLow            uint32        binding                          Current bindings (Low)
    unackedMessages        uint32        message                          Messages consumed but not yet acked
    unackedMessagesHigh    uint32        message                          Messages consumed but not yet acked (High)
    unackedMessagesLow     uint32        message                          Messages consumed but not yet acked (Low)
    messageLatencySamples  delta-time    nanosecond                       Broker latency through this queue (Samples)
    messageLatencyMin      delta-time    nanosecond                       Broker latency through this queue (Min)
    messageLatencyMax      delta-time    nanosecond                       Broker latency through this queue (Max)
    messageLatencyAverage  delta-time    nanosecond                       Broker latency through this queue (Average)
Method 'purge' Discard all messages on queue
qpid: list queue
Objects of type qpid.queue
    ID    Created   Destroyed  Index
    ===========================================================================
    1012  21:08:13  -          1002.pub_start
    1014  21:08:13  -          1002.pub_done
    1016  21:08:13  -          1002.sub_ready
    1018  21:08:13  -          1002.sub_done
    1020  21:08:13  -          1002.perftest0
    1038  21:09:08  -          1002.mgmt-3206ff16-fb29-4a30-82ea-e76f50dd7d15
    1040  21:09:08  -          1002.repl-3206ff16-fb29-4a30-82ea-e76f50dd7d15
    1046  21:09:32  -          1002.mgmt-df06c7a6-4ce7-426a-9f66-da91a2a6a837
    1048  21:09:32  -          1002.repl-df06c7a6-4ce7-426a-9f66-da91a2a6a837
    1054  21:10:01  -          1002.mgmt-c55915c2-2fda-43ee-9410-b1c1cbb3e4ae
    1056  21:10:01  -          1002.repl-c55915c2-2fda-43ee-9410-b1c1cbb3e4ae
    1063  21:26:00  -          1002.mgmt-8d621997-6356-48c3-acab-76a37081d0f3
    1065  21:26:00  -          1002.repl-8d621997-6356-48c3-acab-76a37081d0f3
qpid: list 1020
Object of type qpid.queue: (last sample time: 21:26:02)
    Type    Element                1020
    ==========================================================================
    config  vhostRef               1002
    config  name                   perftest0
    config  durable                False
    config  autoDelete             False
    config  exclusive              False
    config  arguments              {'qpid.max_size': 0, 'qpid.max_count': 0}
    config  storeRef               NULL
    inst    msgTotalEnqueues       500000 messages
    inst    msgTotalDequeues       500000
    inst    msgTxnEnqueues         0
    inst    msgTxnDequeues         0
    inst    msgPersistEnqueues     0
    inst    msgPersistDequeues     0
    inst    msgDepth               0
    inst    msgDepthHigh           0
    inst    msgDepthLow            0
    inst    byteTotalEnqueues      512000000 octets
    inst    byteTotalDequeues      512000000
    inst    byteTxnEnqueues        0
    inst    byteTxnDequeues        0
    inst    bytePersistEnqueues    0
    inst    bytePersistDequeues    0
    inst    byteDepth              0
    inst    byteDepthHigh          0
    inst    byteDepthLow           0
    inst    enqueueTxnStarts       0 transactions
    inst    enqueueTxnCommits      0
    inst    enqueueTxnRejects      0
    inst    enqueueTxnCount        0
    inst    enqueueTxnCountHigh    0
    inst    enqueueTxnCountLow     0
    inst    dequeueTxnStarts       0
    inst    dequeueTxnCommits      0
    inst    dequeueTxnRejects      0
    inst    dequeueTxnCount        0
    inst    dequeueTxnCountHigh    0
    inst    dequeueTxnCountLow     0
    inst    consumers              0 consumers
    inst    consumersHigh          0
    inst    consumersLow           0
    inst    bindings               1 binding
    inst    bindingsHigh           1
    inst    bindingsLow            1
    inst    unackedMessages        0 messages
    inst    unackedMessagesHigh    0
    inst    unackedMessagesLow     0
    inst    messageLatencySamples  0
    inst    messageLatencyMin      0
    inst    messageLatencyMax      0
    inst    messageLatencyAverage  0
qpid:

2.1.4.  Using qpid-printevents

This utility connects to one or more brokers and collects events, printing out a line per event.

$ qpid-printevents --help
Usage: qpid-printevents [options] [broker-addr]...

Collect and print events from one or more Qpid message brokers.  If no broker-
addr is supplied, qpid-printevents will connect to 'localhost:5672'. broker-
addr is of the form:  [username/password@] hostname | ip-address [:<port>] ex:
localhost, 10.1.1.7:10000, broker-host:10000, guest/guest@localhost

Options:
  -h, --help  show this help message and exit

You get the idea... have fun!

2.1.5. Using qpid-ha

This utility lets you monitor and control the activity of the clustering behavior provided by the HA module.

    
qpid-ha --help
usage: qpid-ha <command> [<arguments>]

Commands are:

  ready        Test if a backup broker is ready.
  query        Print HA configuration settings.
  set          Set HA configuration settings.
  promote      Promote broker from backup to primary.
  replicate    Set up replication from <queue> on <remote-broker> to <queue> on the current broker.

For help with a command type: qpid-ha <command> --help