Slave not getting updates (3 replies)

Hi,
I am having a problem setting up master/slave replication for the first time.
The master is on an old Debian box running mysql 5.0.51, the slave is on an ubuntu box running 5.5.38. I want to implement one-way replication of a single database.

The problem is that although the slave reports that it is up-to-date (' Slave_IO_State: Waiting for master to send event', 'Seconds_Behind_Master: 0'), it is not actually replicating changes and the 'Read_Master_Log_Pos:' (996) is falling behind the position shown on the master (1098). Master log files match on master and slave

This is on a master database where no changes are currently taking place unless I initiate them (i.e. a record add or delete).
There are no errors in the logs of either the master or the slave

Sometimes - i'm not sure what triggers this, it could be a mysql restart on either the server or the slave), the slave will get up-to-date, but it is not happening on anything like a reliable, regular basis.

Any ideas what I do next?

mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 78.109.160.124
Master_User: slave_user
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000011
Read_Master_Log_Pos: 996
Relay_Log_File: mysqld-relay-bin.000027
Relay_Log_Pos: 923
Relay_Master_Log_File: mysql-bin.000011
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: admin_vouchers
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 996
Relay_Log_Space: 1436
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1

mysql> show processlist\G;
*************************** 1. row ***************************
Id: 1
User: system user
Host:
db: NULL
Command: Connect
Time: 6678
State: Waiting for master to send event
Info: NULL
*************************** 2. row ***************************
Id: 2
User: system user
Host:
db: NULL
Command: Connect
Time: 3557
State: Slave has read all relay log; waiting for the slave I/O thread to update it
Info: NULL
*************************** 3. row ***************************

on master...

mysql> show processlist\G;
*************************** 1. row ***************************
Id: 12
User: mysqladmin
Host: localhost
db: admin_vouchers
Command: Sleep
Time: 6445
State:
Info: NULL
*************************** 2. row ***************************
Id: 17600
User: slave_user
Host: 5.57.57.18:35060
db: NULL
Command: Binlog Dump
Time: 2924
State: Has sent all binlog to slave; waiting for binlog to be updated
Info: NULL

mysql> show master status \G
*************************** 1. row ***************************
File: mysql-bin.000011
Position: 1098
Binlog_Do_DB: admin_vouchers
Binlog_Ignore_DB: