在本机搭建mycat 单机环境，使用mariadb 伪集群

首先搭建mairadb的集群

master 使用端口3306

slave 使用端口3406

master 相关配置

在my.ini 文件的[mysqld] 节点中添加或修改如下配置

#允许其他机器remote 访问

bind-address=0.0.0.0

#开启master bin log

log-bin=mysql-bin

#配置需要进行主从同步的数据库
binlog_do_db=iotplatform

#配置不需要进行主从同步的数据库
binlog_ignore_db=mysql,es,activemqdb
# binary logging format - mixed recommended 默认配置即可
binlog_format=mixed

#这里的id 和slave 必须不一样。修改master 或者slave 均可
server-id = 1

#开启修改即时同步
sync_binlog = 1

slave 相关配置

在my.ini 文件的[mysqld] 节点中添加或修改如下配置

relay_log=relay-bin

port = 3406

注释掉

log-bin=mysql-bin 和 binlog_format=mixed slave 不需要bin log

在[client] 节点修改如下配置

port = 3406

完整master 节点my.ini配置如下

# Example MariaDB config file for large systems.
#
# This is for a large system with memory = 512M where the system runs mainly
# MariaDB.
#
# MariaDB programs look for option files in a set of
# locations which depend on the deployment platform.
# You can copy this option file to one of those
# locations. For information about these locations, do:
# 'my_print_defaults --help' and see what is printed under
# Default options are read from the following files in the given order:
# More information at: http://dev.mysql.com/doc/mysql/en/option-files.html
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.

# The following options will be passed to all MariaDB clients
[client]
#password    = your_password
port        =
socket        = /tmp/mysql.sock

# Here follows entries for some specific programs

# The MariaDB server
[mysqld]
port        =
socket        = /tmp/mysql.sock
skip-external-locking
key_buffer_size = 256M
max_allowed_packet = 1M
table_open_cache =
sort_buffer_size = 1M
read_buffer_size = 1M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 64M
thread_cache_size =
query_cache_size= 16M
# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 

bind-address=0.0.0.0

# Point the following paths to different dedicated disks
#tmpdir        = /tmp/

# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
#
#skip-networking

# Replication Master Server (default)
# binary logging is required for replication
log-bin=mysql-bin
binlog_do_db=iotplatform
binlog_ignore_db=mysql,es,activemqdb
# binary logging format - mixed recommended
binlog_format=mixed

# required unique id between  and ^ -
# defaults to  if master-host is not set
# but will not function as a master if omitted
server-id    =
sync_binlog =
# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# ) Use the CHANGE MASTER TO command (fully described in our manual) -
#    the syntax is:
#
#    CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
#    MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
#
#    where you replace <host>, <user>, <password> by quoted strings and
#    <port> by the master's port number (3306 by default).
#
#    Example:
#
#    CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=,
#    MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# ) Set the variables below. However, in case you choose this method, then
#    start replication for the first time (even unsuccessfully, for example
#    if you mistyped the password in master-password and the slave fails to
#    connect), the slave will create a master.info file, and any later
#    change in this file to the variables' values below will be ignored and
#    overridden by the content of the master.info file, unless you shutdown
#    the slave server, delete master.info and restart the slaver server.
#    For that reason, you may want to leave the lines below untouched
#    (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between  and ^ -
# (and different from the master)
# defaults to  if master-host is set
# but will not function as a slave if omitted
#server-id       =
#
# The replication master for this slave - required
#master-host     =   <hostname>
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user     =   <username>
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password =   <password>
#
# The port the master is listening on.
# optional - defaults to
#master-port     =  <port>
#
# binary logging - not required for slaves, but recommended
#log-bin=mysql-bin

# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = C:\\mysql\\data\\
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = C:\\mysql\\data\\
# You can set .._buffer_pool_size up to  -  %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 256M
#innodb_additional_mem_pool_size = 20M
# Set .._log_file_size to  % of buffer pool size
#innodb_log_file_size = 64M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit =
#innodb_lock_wait_timeout = 

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[myisamchk]
key_buffer_size = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

完整的slave 节点my.ini 配置如下

# Example MariaDB config file for large systems.
#
# This is for a large system with memory = 512M where the system runs mainly
# MariaDB.
#
# MariaDB programs look for option files in a set of
# locations which depend on the deployment platform.
# You can copy this option file to one of those
# locations. For information about these locations, do:
# 'my_print_defaults --help' and see what is printed under
# Default options are read from the following files in the given order:
# More information at: http://dev.mysql.com/doc/mysql/en/option-files.html
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.

# The following options will be passed to all MariaDB clients
[client]
#password    = your_password
port        =
socket        = /tmp/mysql.sock

# Here follows entries for some specific programs

# The MariaDB server
[mysqld]
port        =
socket        = /tmp/mysql.sock
skip-external-locking
key_buffer_size = 256M
max_allowed_packet = 1M
table_open_cache =
sort_buffer_size = 1M
read_buffer_size = 1M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 64M
thread_cache_size =
query_cache_size= 16M
# Try number of CPU's*2 for thread_concurrency
thread_concurrency =
relay_log=relay-bin
# Point the following paths to different dedicated disks
#tmpdir        = /tmp/

# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
#
#skip-networking

# Replication Master Server (default)
# binary logging is required for replication
#log-bin=mysql-bin

# binary logging format - mixed recommended
#binlog_format=mixed

# required unique id between  and ^ -
# defaults to  if master-host is not set
# but will not function as a master if omitted
server-id    = 

# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# ) Use the CHANGE MASTER TO command (fully described in our manual) -
#    the syntax is:
#
#    CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
#    MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
#
#    where you replace <host>, <user>, <password> by quoted strings and
#    <port> by the master's port number (3306 by default).
#
#    Example:
#
#    CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=,
#    MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# ) Set the variables below. However, in case you choose this method, then
#    start replication for the first time (even unsuccessfully, for example
#    if you mistyped the password in master-password and the slave fails to
#    connect), the slave will create a master.info file, and any later
#    change in this file to the variables' values below will be ignored and
#    overridden by the content of the master.info file, unless you shutdown
#    the slave server, delete master.info and restart the slaver server.
#    For that reason, you may want to leave the lines below untouched
#    (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between  and ^ -
# (and different from the master)
# defaults to  if master-host is set
# but will not function as a slave if omitted
#server-id       =
#
# The replication master for this slave - required
#master-host     =   <hostname>
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user     =   <username>
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password =   <password>
#
# The port the master is listening on.
# optional - defaults to
#master-port     =  <port>
#
# binary logging - not required for slaves, but recommended
#log-bin=mysql-bin

# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = C:\\mysql\\data\\
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = C:\\mysql\\data\\
# You can set .._buffer_pool_size up to  -  %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 256M
#innodb_additional_mem_pool_size = 20M
# Set .._log_file_size to  % of buffer pool size
#innodb_log_file_size = 64M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit =
#innodb_lock_wait_timeout = 

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[myisamchk]
key_buffer_size = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

 

接下来是操作部分

---------------------master 操作部分----------------------------

启动master mysql 并root 登录

备份master 数据库（可以用其他工具代替，例如navicat 或者sqlyog）这期间可以锁住master 数据库不允许写入，如果只是搭建个开发环境，这一步可以省略

锁住master 数据库

FLUSH TABLES WITH READ LOCK;

备份数据库

mysqldump -uroot -p --all-databases > databases.sql

解锁数据库

UNLOCK TABLES;

查看主库状态

SHOW MASTER STATUS;

MariaDB [(none)]> SHOW MASTER STATUS;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000002 |      326 |              |                  |
+------------------+----------+--------------+------------------+

记下 file 字段与 position 字段的值，配置slave 的时候会用到。

---------------------master 操作部分 end----------------------------

---------------------slave 操作部分---------------------------

启动 slave mysql

将备份出来的sql 导入到slave 节点中（可以用其他工具替代，同上）

mysql -uroot -p < databases.sql

设置主从复制

MariaDB [(none)]> CHANGE MASTER TO MASTER_HOST='localhost',MASTER_USER='root', MASTER_PASSWORD='', MASTER-PORT=3306, MASTER_LOG_FILE='mysql-bin.000002', MASTER_LOG_POS= 326;
Query OK, 0 rows affected (0.24 sec)

开启主从复制

MariaDB [(none)]> START SLAVE;
Query OK, 0 rows affected (0.00 sec)

查看从库状态

SHOW SLAVE STATUS;

结果中Slave_IO_Running和Slave_SQL_Running必须为Yes，如果不是，需要根据提示的错误修改。

测试主从复制是否正常

修改主库的数据，查看从库是否更新。

---------------------slave 操作部分 end ---------------------------

mycat 配置部分

修改shema.xml datahost 部分

    <dataHost name="localhost1" maxCon="1000" minCon="10" balance="0"
        writeType="0" dbType="mysql" dbDriver="native">
        <heartbeat>select user()</heartbeat>
        <!-- can have multi write hosts -->
        <writeHost host="hostM1" url="localhost:3306" user="root"
            password="123456">

            <!-- can have multi read hosts -->
            <readHost host="hostS1" url="localhost:3406" user="root" password="123456" ></readHost>

        </writeHost>

        <!-- <writeHost host="hostM2" url="localhost:3316" user="root" password="123456"/> -->
    </dataHost>

配置完成