环境：
OS:CentOS release 5.5 (Final) (64位)
2.6.18-194.el5 #1 SMP Fri Apr 2 14:58:14 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
Mysql:
mysql-5.5.3-m3.tar.gz
Master:192.168.0.100
Slave:192.168.0.200
      大部分配置跟"MySQL主从同步、读写分离配置步骤、问题解决笔记[原创]"类似，但在从服务器上配置的时候，加的复制条件都不能启动数据库；不过据网上消息介绍，Mysql版本从5.1.7以后开始就不支持“master-host”类似的参数; 
查看mysql_error.log中的报错信息如下；
110105 13:38:00 mysqld_safe mysqld from pid file /data0/mysql/3306/mysql.pid ended
110105 13:38:06 mysqld_safe Starting mysqld daemon with databases from /data0/mysql/3306/data
InnoDB: The InnoDB memory heap is disabled
InnoDB: Mutexes and rw_locks use GCC atomic builtins
110105 13:38:06  InnoDB: highest supported file format is Barracuda.
110105 13:38:06 InnoDB Plugin 1.0.6 started; log sequence number 44309
110105 13:38:06 [ERROR] /usr/local/webserver/mysql/libexec/mysqld: unknown variable 'master-host=192.168.7.202'
110105 13:38:06 [ERROR] Aborting

110105 13:38:06  InnoDB: Starting shutdown...
110105 13:38:08  InnoDB: Shutdown completed; log sequence number 44319
110105 13:38:08 [Note] /usr/local/webserver/mysql/libexec/mysqld: Shutdown complete
无奈之下，从数据库my.cnf修改为以下配置；（主数据库中注意ID为1，并加入要同步的库既可）
[client]
character-set-server = utf8
port = 3306
socket = /tmp/mysql.sock

[mysqld]
character-set-server = utf8
replicate-ignore-db = mysql
replicate-do-db = db
replicate-ignore-db = test
replicate-ignore-db = information_schema
user = mysql
port = 3306
socket = /tmp/mysql.sock
basedir = /usr/local/mysql
datadir = /home/mysql/data
log-error = /home/mysql/mysql_error.log
pid-file = /home/mysql/mysql.pid
open_files_limit = 10240
back_log = 600
max_connections = 5000
max_connect_errors = 6000
table_cache = 614
external-locking = FALSE
max_allowed_packet = 32M
sort_buffer_size = 1M
join_buffer_size = 1M
thread_cache_size = 300
#thread_concurrency = 8
query_cache_size = 512M
query_cache_limit = 2M
query_cache_min_res_unit = 2k
default-storage-engine = MyISAM
thread_stack = 192K
transaction_isolation = READ-COMMITTED
tmp_table_size = 246M
max_heap_table_size = 246M
long_query_time = 3
log-slave-updates
log-bin = /home/mysql/binlog/binlog
binlog_cache_size = 4M
binlog_format = MIXED
max_binlog_cache_size = 8M
max_binlog_size = 1G
relay-log-index = /home/mysql/relaylog/relaylog
relay-log-info-file = /home/mysql/relaylog/relaylog
relay-log = /home/mysql/relaylog/relaylog
expire_logs_days = 30
key_buffer_size = 256M
read_buffer_size = 1M
read_rnd_buffer_size = 16M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1
myisam_recover
interactive_timeout = 120
wait_timeout = 120
skip-name-resolve
#master-connect-retry = 10
slave-skip-errors = 1032,1062,126,1114,1146,1048,1396
#master-host = 192.168.1.2
#master-user = username
#master-password = password
#master-port = 3306
server-id = 2
innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 512M
innodb_data_file_path = ibdata1:256M:autoextend
innodb_file_io_threads = 4
innodb_thread_concurrency = 8
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 16M
innodb_log_file_size = 128M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120
innodb_file_per_table = 0

#log-slow-queries = /home/mysql/slow.log

#long_query_time = 10

[mysqldump]
quick
max_allowed_packet = 32M

此时启动完数据库后，在从库上执行如下命令；
change master to master_host='192.168.0.100', master_user='slave', master_password='******', master_log_file='mysql-bin.000010', master_log_pos=16860;
slave start;
执行:show  slave status"G;时看到的如下状态；
mysql> show slave status"G;
*************************** 1. row ***************************
               Slave_IO_State: Connecting to master
                  Master_Host: 192.168.0.100
                  Master_User: slave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: binlog.000010
          Read_Master_Log_Pos: 16860
               Relay_Log_File: relaylog.000014
                Relay_Log_Pos: 17003
        Relay_Master_Log_File: binlog.000010
             Slave_IO_Running: Connecting
            Slave_SQL_Running: Yes
              Replicate_Do_DB: db
          Replicate_Ignore_DB: mysql,test,information_schema
           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: 16860
              Relay_Log_Space: 17295
              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: error reconnecting to master 'slave@192.168.0.100:3306' - retry-time: 60  retries: 86400
               Last_SQL_Error: 
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 1
1 row in set (0.00 sec)

ERROR: 
No query specified

从上面的状态可以看到，此时还无法从主库同步；

然后登录192.168.0.100主数据库,允许从数据库同步相关数据；
grant replication slave on *.* to slave@192.168.0.200 identified by '******'
再次重启从数据库，登录进去查看状态时：
mysql> show slave status"G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.0.100
                  Master_User: datasync
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: binlog.000010
          Read_Master_Log_Pos: 16860
               Relay_Log_File: relaylog.000014
                Relay_Log_Pos: 17003
        Relay_Master_Log_File: binlog.000010
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: db
          Replicate_Ignore_DB: mysql,test,information_schema
           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: 16860
              Relay_Log_Space: 17295
              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
1 row in set (0.00 sec)

ERROR: 
No query specified
到此操作完成。
注意：主、从的my.cnf配置主要是ID，别的都问题不大。