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Added RabbitMQ documentation.

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# Rabbit MQ setup and MaxScale Integration
## Introduction
A step by step guide helps installing a RabbitMQ server and testing it before MaxScale integration.
New plugin filter and a message consumer application need to be compiled and linked with an external C library, RabbitMQ-c, that provides AMQP protocol integration.
Custom configuration, with TCP/IP and Queue parameters, is also detailed here.
The software install setup provides RPM and DEB packaging and traditional compilation steps.
## Step 1 - Get the RabbitMQ binaries
On Centos 6.5 using fedora / RHEL rpm get the rpm from [http://www.rabbitmq.com/](http://www.rabbitmq.com/ "RabbitMQ")
rabbitmq-server-3.3.4-1.noarch.rpm
Please note, before installing RabbitMQ, you must install Erlang.
Example:
yum install erlang
Package erlang-R14B-04.3.el6.x86_64 already installed and latest version
## Step 2 - Install and Start the Server
Install the packages using your distribution's package manager and start the server:
yum install rabbitmq-server-3.3.4-1.noarch.rpm
systemctl start rabbitmq-server.service
To configure your RabbitMQ server, please refer to the RabbitMQ website: [http://www.rabbitmq.com/](http://www.rabbitmq.com/ RabbitMQ website).
rabbitmqctl is a command line tool for managing a RabbitMQ broker. It performs all actions by connecting to one of the broker's nodes.
rabbitmqctl list_queues
rabbitmqctl list_queues | list_exchanges| cluster_status | list_bindings | list_connections | list_consumers | status
Example output:
[root@maxscale-02 MaxScale]# rabbitmqctl status
Status of node 'rabbit@maxscale-02' ...
[{pid,12251},
{running_applications,[{rabbit,"RabbitMQ","3.3.4"},
{os_mon,"CPO CXC 138 46","2.2.7"},
{xmerl,"XML parser","1.2.10"},
{mnesia,"MNESIA CXC 138 12","4.5"},
{sasl,"SASL CXC 138 11","2.1.10"},
{stdlib,"ERTS CXC 138 10","1.17.5"},
{kernel,"ERTS CXC 138 10","2.14.5"}]},
{os,{unix,linux}},
{erlang_version,"Erlang R14B04 (erts-5.8.5) [source] [64-bit] [smp:2:2] [rq:2] [async-threads:30] [kernel-poll:true]\n"},
...
{listeners,[{clustering,25672,"::"},{amqp,5672,"::"}]},
...
...done.
[root@maxscale-02 MaxScale]# rabbitmqctl list_bindings
Listing bindings ...
x1 exchange q1 queue k1 []
...done.
Interaction with the server may require stop & reset at some point:
rabbitmqctl stop_app
rabbitmqctl reset
rabbitmqctl start_app
## Step 3 - Install and test the client libraries
The selected library for MaxScale integration of RabbitMQ is:
[https://github.com/alanxz/rabbitmq-c](https://github.com/alanxz/rabbitmq-c RabbitMQ-C)
### Manual software compilation
To compile the RabbitMQ-C libraries manually:
git clone https://github.com/alanxz/rabbitmq-c.git
cd rabbitmq-c
cmake -DCMAKE_INSTALL_PREFIX=/usr .
make
make install
Please note, this will install the packages to /usr. If you do not wish to install them to this location, provide a different value for the CMAKE_INSTALL_PREFIX variable.
### Setup using the EPEL repository
Check how to configure your distribution for the EPEL repository: [https://fedoraproject.org/wiki/EPEL](https://fedoraproject.org/wiki/EPEL EPEL)
Configure your repositories and install the software:
yum install librabbitmq.x86_64
you might also like to install:
librabbitmq-tools.x86_64, librabbitmq-devel.x86_64
Please note you may also install the rabbitmq server from the EPEL repository:
yum install rabbitmq-server
### Basic tests with library
The required library librabbitmq-c is now installed and we continue with basic operations with amqp_* tools, located in the examples/ folder of the build direcotry, testing client server interaction.
Please note, those example applications may not be included in the RPM library packages.
#### Test 1 - create the exchange
[root@maxscale-02 examples]# ./amqp_exchange_declare
Usage: amqp_exchange_declare host port exchange exchangetype
Declare the exchange:
[root@maxscale-02 examples]# ./amqp_exchange_declare 127.0.0.1 5672 foo direct
#### Test 2 - Listen to exchange with selected binding key
[root@maxscale-02 examples]# ./amqp_listen
Usage: amqp_listen host port exchange bindingkey
Start the listener:
[root@maxscale-02 examples]# ./amqp_listen 127.0.0.1 5672 foo k1 &
#### Test 3 - Send a message …
[root@maxscale-02 examples]# ./amqp_sendstring
Usage: amqp_sendstring host port exchange routingkey messagebody
[root@maxscale-02 examples]# ./amqp_sendstring 127.0.0.1 5672 foo k1 “This is a new message”
... and watch the listener output
Delivery 1, exchange foo routingkey k1
Content-type: text/plain
## Step 4 - MaxScale integration with librabbitmq-c
A new filter (mqfilter.c) is implemented in order to send messages to the rabbitmq server and a message consumer (rabbitmq_consumer/consumer.c) program will get messages and store them into a MySQL/MariaDB database.
A quick way to install MaxScale with the RabbitMQ filter is to go to the MaxScale source directory and run the following commands:
mkdir build
cd build
cmake .. -DBUILD_RABBITMQ=Y
make
make install
To build the RabbitMQ filter CMake needs an additional parameter:
-DBUILD_RABBITMQ=Y
If the librabbitmq-c library is manually compiled it may be necessary to manually pass the location of the libraries and header files to CMake.
Libraries:
-DRABBITMQ_LIBRARIES=<path to RabbitMQ-c libraries>
Headers:
-DRABBITMQ_HEADERS=<path to RabbitMQ-c headers>
Please note, Message Queue Consumer (consumer.c) also needs to be compiled with MySQL/MariaDB client libraries in addition to the RabbitMQ-c libraries. If you have your MySQL/MariaDB client libraries and headers in non-standard locations, you can pass them manually to CMake:
Libraries:
-DMYSQLCLIENT_LIBRARIES=<path to libraries>
Headers:
-DMYSQLCLIENT_HEADERS=<path to headers>
The message queue consumer must be also built as a separate task, it’s not built as part of MaxScale build system. To build it, run the following commands in the rabbitmq_consumer directory in the MaxScale source folder:
mkdir build
cd build
cmake ..
make
To install it:
make install
To build packages:
make package
This generates RPM or DEB packages based on your system. These packages can then be installed on remote systems for easy access to the data generated by the consumer client.
## Step 5 - Configure new applications
The new filter needs to be configured in MaxScale.cnf.
[Test Service]
type=service
router=readconnroute
router_options=slave
servers=server1,server2,server3,server5,server4
user=massi
passwd=massi
filters=MQ
[MQ]
type=filter
module=mqfilter
exchange=x1
key=k1
queue=q1
hostname=127.0.0.1
port=5672
logging_trigger=all
Logging triggers define whether to log all or a subset of the incoming queries using these options:
# log only some elements or all
logging_trigger=[all,source,schema,object]
# Whether to log only SELECT, UPDATE, INSERT and DELETE queries or all possible queries
logging_log_all=true|false
# Log only when any of the trigger parameters match or only if all parameters match
logging_strict=true|false
# specify objects
logging_object=mytable,another_table
# specify logged users
logging_source_user=testuser,testuser
# specify source addresses
logging_source_host=127.0.0.1,192.168.10.14
# specify schemas
logging_schema=employees,orders,catalog
Example:
logging_trigger=object,schema,source
logging_strict=false
logging_log_all=false
logging_object=my1
logging_schema=test
logging_source_user=maxtest
The logging result of the example is:
if user maxtest does something, it's logged
and all queries in test schema are logged
anything targeting my1 table is logged
SELECT NOW(), SELECT MD5(“xyz)” are not logged
Please note that if we want to log only the user ‘maxtest’ accessing the schema ‘test’ with target ‘my1’ the option logging_strict must be set to TRUE and if we want to include those selects without schema name the option logging_log_all must be set to TRUE.
The mqfilter logs into the MaxScale TRACE log informations about the matched logging triggers and the message delivering:
2014 09/03 06:22:04 Trigger is TRG_SOURCE: user: testuser = testuser
2014 09/03 06:22:04 Trigger is TRG_SCHEMA: test = test
2014 09/03 06:22:04 Trigger is TRG_OBJECT: test.t1 = t1
2014 09/03 06:22:04 Routing message to: 127.0.0.1:5672 / as guest/guest, exchange: x1<direct> key:k1 queue:q1
The consumer application needs to be configured as well:
#The options for the consumer are:
#hostname RabbitMQ hostname
#port RabbitMQ port
#vhost RabbitMQ virtual host
#user RabbitMQ username
#passwd RabbitMQ password
#queue Name of the queue to use
#dbserver SQL server name
#dbport SQL server port
#dbname Name of the database to use
#dbuser SQL server username
#dbpasswd SQL server password
#logfile Message log filename
[consumer]
hostname=127.0.0.1
port=5672
vhost=/
user=guest
passwd=guest
queue=q1
dbserver=127.0.0.1
dbport=3308
dbname=mqpairs
dbuser=xxx
dbpasswd=yyy
We may probably need to modify LD_LIBRARY_PATH before launching ‘consumer’:
# export LD_LIBRARY_PATH=/packages/rabbitmq-c/rabbitmq-c/librabbitmq:/packages/mariadb_client-2.0.0-Linux/lib/mariadb:/usr/lib64
and finally we can launch it:
# ./consumer
If the consumer.cnf file is not in the same directory as the binary file is, you can provide the location of the folder that it is in by passing it the -c flag followed by the path:
# ./consumer -c path/to/file
and start maxScale as well
## Step 6 - Test the filter and check collected data
Assuming that MaxScale and the message consumer are successfully running let’s connect to the service with an active mqfilter:
[root@maxscale-02 MaxScale]# mysql -h 127.0.0.1 -P 4506 -uxxx -pyyy
...
MariaDB [(none)]> select RAND(3), RAND(5);
+--------------------+---------------------+
| RAND(3) | RAND(5) |
+--------------------+---------------------+
| 0.9057697559760601 | 0.40613597483014313 |
+--------------------+---------------------+
1 row in set (0.01 sec)
…
MariaDB [(none)]> select RAND(3544), RAND(11);
we can check the consumer output in the terminal where it was started:
--------------------------------------------------------------
Received: 1409671452|select @@version_comment limit ?
Received: 1409671452|Columns: 1
...
Received: 1409671477|select RAND(?), RAND(?)
Received: 1409671477|Columns: 2
We query now the database for the content collected so far:
MariaDB [(none)]> use mqpairs;
Database changed
MariaDB [mqpairs]> select * from pairs;
+-------------------------------------+----------------------------------+------------+---------------------+---------------------+---------+
| tag | query | reply | date_in | date_out | counter |
+-------------------------------------+----------------------------------+------------+---------------------+---------------------+---------+
| 006c006d006e006f007000710072007374 | select @@version_comment limit ? | Columns: 1 | 2014-09-02 11:14:51 | 2014-09-02 11:26:38 | 3 |
| 00750076007700780079007a007b007c7d | SELECT DATABASE() | Columns: 1 | 2014-09-02 11:14:56 | 2014-09-02 11:27:06 | 3 |
| 007e007f00800081008200830084008586 | show databases | Columns: 1 | 2014-09-02 11:14:56 | 2014-09-02 11:27:06 | 3 |
| 008700880089008a008b008c008d008e8f | show tables | Columns: 1 | 2014-09-02 11:14:56 | 2014-09-02 11:27:06 | 3 |
| 0090009100920093009400950096009798 | select * from mqpairs.pairs | Columns: 6 | 2014-09-02 11:15:00 | 2014-09-02 11:27:00 | 12 |
| 00fc00fd00fe00ff0100010101020103104 | select NOW() | Columns: 1 | 2014-09-02 11:24:23 | 2014-09-02 11:24:23 | 1 |
| 01050106010701080109010a010b010c10d | select RAND(?), RAND(?) | Columns: 2 | 2014-09-02 11:24:37 | 2014-09-02 11:24:37 | 1 |
+-------------------------------------+----------------------------------+------------+---------------------+---------------------+---------+
7 rows in set (0.01 sec)
The filter send queries to the RabbitMQ server in the canonical format, i.e select RAND(?), RAND(?).
The queries Message Queue Consumer application gets from the server are stored with a counter that quickly shows how many times that normalized query was received:
| 01050106010701080109010a010b010c10d | select RAND(?), RAND(?) | Columns: 2 | 2014-09-02 11:24:37 | 2014-09-02 11:29:15 | 3 |