The MySQL Python Replicant is a library for controlling and maintaining large deployments of MySQL servers. The library provide classes and functions to be able to fetch data from server, redirect servers, and in general control a replication setup.

Based on https://code.launchpad.net/~mkindahl/mysql-replicant-python/trunk revision 39

The following command will execute the tests for the library.

python setup.py test

The test suite currently does not use a mock database connection, so for the server tests to work, you have to have a set of database servers configured.

I have done the following to set up four servers on my local machine:

1. Edit /etc/mysql/my.cnf and adding the following lines:

    [mysqld_multi]
    mysqladmin      = /usr/bin/mysqladmin
    user            = root
    
    [mysqld1]
    !include /etc/mysql/mysqld1.cnf
    
    [mysqld2]
    !include /etc/mysql/mysqld2.cnf
    
    [mysqld3]
    !include /etc/mysql/mysqld3.cnf
    
    [mysqld4]
    !include /etc/mysql/mysqld4.cnf
   

   The section headers are necessary for mysql_multi to recognize the servers.

2. Create one configuration file for each server, for example:

    [mysqld1]
    server-id       = 1
    pid-file        = /var/run/mysqld/mysqld1.pid
    socket          = /var/run/mysqld/mysqld1.sock
    port            = 3307
    datadir         = /var/lib/mysql1
    log-bin         = /var/lib/mysql1/mysqld1-bin.log
    log-bin-index   = /var/lib/mysql1/mysqld1-bin.index
   

3. Start the servers.

    $ sudo -umysql mysqld_multi start
   

4. Edit the /tests/deployment/ file so that the information is correct.

5. Create a 'test' database where all necessary tables will be created.

6. It is necessary to create a user mysql_replicant@localhost on each server and grant them full access. The following commands (executed on each server) should solve this.

    CREATE USER mysql_replicant@localhost;
    GRANT ALL ON *.* TO mysql_replicant@localhost WITH GRANT OPTION;
   

7. Run the tests.

If you have apparmor active (I had), you have to edit the apparmor file to avoid an error. I did the following change to /etc/apparmor.d/usr.sbin.mysqld:

--- usr.sbin.mysqld.orig        2010-07-04 09:16:51.218593117 +0200
+++ usr.sbin.mysqld     2010-07-04 09:16:14.286592607 +0200
@@ -23,6 +23,7 @@
   /etc/mysql/conf.d/ r,
   /etc/mysql/conf.d/* r,
   /etc/mysql/my.cnf r,
+  /etc/mysql/mysqld[0-9].cnf, r
   /usr/sbin/mysqld mr,
   /usr/share/mysql/** r,
   /var/log/mysql.log rw,
@@ -33,6 +34,14 @@
   /var/log/mysql/* rw,
   /var/run/mysqld/mysqld.pid w,
   /var/run/mysqld/mysqld.sock w,
+  /var/log/mysql[1-9].log rw,
+  /var/log/mysql[1-9].err rw,
+  /var/lib/mysql[1-9]/ r,
+  /var/lib/mysql[1-9]/** rwk,
+  /var/log/mysql[1-9]/ r,
+  /var/log/mysql[1-9]/* rw,
+  /var/run/mysqld/mysqld[1-9].pid w,
+  /var/run/mysqld/mysqld[1-9].sock w,

   /sys/devices/system/cpu/ r,
 }

To install the library

python setup.py install