Mysql-5.5版本搭建实例的部分库的从库

由于业务需要在Mysql实例中创建部分库的从库，已有的Mysql实例的版本是mysql-5.5.49，是一个非常老的版本。

本文档涉及到服务器中运行多实例和构建实例中部分库的从库。

服务器	mysql端口	功能
服务器1	3306	主库
服务器2	3307	服务器1中部分库的从库

1、服务器2上创建3307实例

首先需要准备源码编译包，这个就不在描述了。由于我服务器2上已经存在了一个同样版本的实例，我就直接copy一份，命名为： mysql-5.5.49_3307 ，并做了一个软连接

ln -s mysql-5.5.49_3307 mysql_3307

服务器2的3307实例是从库，my.cnf的配置最好服务器1主库实例的配置相同，注意修改对应server_id

 [client]
 port            =
 socket          = /tmp/mysql_3307.sock
 
 [mysqld]
 port            =
 socket          = /tmp/mysql_3307.sock
 datadir         = /opt/mysql_3307
 tmpdir=/tmp
 
 skip-name-resolve
 log_warnings = 
 
 #skip-grant-tables
 big_tables              = on
 back_log                =
 max_connections         =
 max_connect_errors      =
 table_open_cache        =
 max_allowed_packet      = 128M
 binlog_cache_size       = 4M
 max_heap_table_size     = 1024M
 read_buffer_size        = 16M
 read_rnd_buffer_size    = 16M
 sort_buffer_size        = 8M
 join_buffer_size        = 16M
 thread_cache_size       =
 thread_concurrency      =
 query_cache_size        = 512M
 query_cache_limit       = 32M
 default-storage-engine  = MYISAM
 #thread_stack           = 192K
 #transaction_isolation  = REPEATABLE READ
 tmp_table_size          = 1024M
 
 server-id               =
 log-bin                 = mysql-bin
 binlog_format           = mixed
 expire_logs_days        = 
 
 replicate_wild_ignore_table  = performance_schema.%
 replicate_wild_ignore_table  = information_schema.%
 replicate_wild_ignore_table  = mysql.%
 replicate_wild_ignore_table  = test.%
 replicate_wild_ignore_table  = tmp.%
 #skip-name-resolve
 
 slave_net_timeout       =
 #master-connect-retry   = 
 
 log-slave-updates       = 
 
 slow_query_log          = sql-slow.log
 long_query_time         =
 slave-skip-errors       = ,
 
 key_buffer_size                 = 2G
 bulk_insert_buffer_size         = 64M
 myisam_sort_buffer_size         = 128M
 myisam_max_sort_file_size       = 4G
 myisam_repair_threads           =
 myisam_recover
 
 innodb_additional_mem_pool_size = 16M
 innodb_buffer_pool_size = 4G
 innodb_data_file_path = ibdata1:256M:autoextend
 innodb_write_io_threads =
 innodb_read_io_threads =
 innodb_thread_concurrency =
 innodb_flush_log_at_trx_commit =
 innodb_log_buffer_size = 16M
 innodb_log_file_size = 256M
 innodb_log_files_in_group =
 innodb_max_dirty_pages_pct =
 innodb_lock_wait_timeout =
 innodb_file_per_table   = 
 
 [mysqldump]
 quick
 max_allowed_packet = 32M
 
 [mysql]
 no-auto-rehash
 
 [myisamchk]
 key_buffer_size = 512M
 sort_buffer_size = 512M
 read_buffer = 8M
 write_buffer = 8M
 
 [mysqlhotcopy]
 interactive-timeout
 
 [mysqld_safe]
 open-files-limit =
 #log-error=/opt/mysql_3307/mysqld.log
 long_query_time =
 log-slow-queries=/opt/mysql_3307/mysql_slow_query.log

注意  添加忽略到不需要同步的主库，（涉及隐私就贴部分公共库出来了）

replicate_wild_ignore_table  = performance_schema.%
replicate_wild_ignore_table  = information_schema.%
replicate_wild_ignore_table  = mysql.%
replicate_wild_ignore_table  = test.%
replicate_wild_ignore_table  = tmp.%

创建数据目录，目录名称一定和my.cnf文件中 “datadir” 配置相同

mkdir -p /opt/mysql_3307

初始化数据库

/usr/local/mysql_3307/scripts/mysql_install_db --defaults-file=/etc/my_3307.cnf --user=mysql --basedir=/usr/local/mysql-5.5.49_3307/ --datadir=/opt/mysql_3307/

启动数据库

nohup /usr/local/mysql_3307/bin/mysqld_safe --defaults-file=/etc/my_3307.cnf &

登录设置root密码，第一次登陆不需要输入密码

#/usr/local/mysql_3307/bin/mysql -uroot -S /tmp/mysql_3307.sock
mysql>update mysql.user set password=PASSWORD('123456') where User='root';
mysql>flush privileges;

2、服务器1上导出实例3306的部分库（需要做从库的数据库）

本次需要对 wcd_ft 这个数据库做从库

 /usr/local/mysql/bin/mysqldump -uroot -p --single-transaction --master-data= -R --database wcd_ft  > wcd_ft.sql

将备份文件传输到服务器2上。

登录数据库创建用于同步的数据库用户

mysql>grant replication slave on *.* to 'repl'@'%' identified by 'repl123';
mysql>flush privileges;

3、服务器2上导入数据库

在服务器2上导入刚备份的数据库

/usr/local/mysql_3307/bin/mysql -uroot -p -S /tmp/mysql_3307.sock < wcd_ft.sql

查看数据库备份文件 wcd_ft.sql 的主库master信息

grep -i "change master" wcd_ft.sql

结果：

-- CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.007289', MASTER_LOG_POS=;

完成后，登录数据库配置主从库的同步。

CHANGE MASTER TO
MASTER_HOST='10.10.18.10（服务器1的ip地址）',
MASTER_USER='repl',
MASTER_PASSWORD='repl123',
MASTER_LOG_FILE='mysql-bin.007289',
MASTER_LOG_POS=;
 
#启动slave从库
start slave；

查看从库的同步状态

show slave status\G;

配置完成。