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
1 [client] 2 port = 3307 3 socket = /tmp/mysql_3307.sock 4 5 [mysqld] 6 port = 3307 7 socket = /tmp/mysql_3307.sock 8 datadir = /opt/mysql_3307 9 tmpdir=/tmp 10 11 skip-name-resolve 12 log_warnings = 2 13 14 #skip-grant-tables 15 big_tables = on 16 back_log = 600 17 max_connections = 3000 18 max_connect_errors = 3000 19 table_open_cache = 2048 20 max_allowed_packet = 128M 21 binlog_cache_size = 4M 22 max_heap_table_size = 1024M 23 read_buffer_size = 16M 24 read_rnd_buffer_size = 16M 25 sort_buffer_size = 8M 26 join_buffer_size = 16M 27 thread_cache_size = 600 28 thread_concurrency = 16 29 query_cache_size = 512M 30 query_cache_limit = 32M 31 default-storage-engine = MYISAM 32 #thread_stack = 192K 33 #transaction_isolation = REPEATABLE READ 34 tmp_table_size = 1024M 35 36 server-id = 10155 37 log-bin = mysql-bin 38 binlog_format = mixed 39 expire_logs_days = 8 40 41 replicate_wild_ignore_table = performance_schema.% 42 replicate_wild_ignore_table = information_schema.% 43 replicate_wild_ignore_table = mysql.% 44 replicate_wild_ignore_table = test.% 45 replicate_wild_ignore_table = tmp.% 46 #skip-name-resolve 47 48 slave_net_timeout = 30 49 #master-connect-retry = 10 50 51 log-slave-updates = 1 52 53 slow_query_log = sql-slow.log 54 long_query_time = 5 55 slave-skip-errors = 1062,1236 56 57 key_buffer_size = 2G 58 bulk_insert_buffer_size = 64M 59 myisam_sort_buffer_size = 128M 60 myisam_max_sort_file_size = 4G 61 myisam_repair_threads = 1 62 myisam_recover 63 64 innodb_additional_mem_pool_size = 16M 65 innodb_buffer_pool_size = 4G 66 innodb_data_file_path = ibdata1:256M:autoextend 67 innodb_write_io_threads = 8 68 innodb_read_io_threads = 8 69 innodb_thread_concurrency = 16 70 innodb_flush_log_at_trx_commit = 2 71 innodb_log_buffer_size = 16M 72 innodb_log_file_size = 256M 73 innodb_log_files_in_group = 3 74 innodb_max_dirty_pages_pct = 90 75 innodb_lock_wait_timeout = 60 76 innodb_file_per_table = 1 77 78 [mysqldump] 79 quick 80 max_allowed_packet = 32M 81 82 [mysql] 83 no-auto-rehash 84 85 [myisamchk] 86 key_buffer_size = 512M 87 sort_buffer_size = 512M 88 read_buffer = 8M 89 write_buffer = 8M 90 91 [mysqlhotcopy] 92 interactive-timeout 93 94 [mysqld_safe] 95 open-files-limit = 10240 96 #log-error=/opt/mysql_3307/mysqld.log 97 long_query_time = 3 98 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=2 -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=662625023;
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=662625023;
#启动slave从库
start slave；
查看从库的同步状态
show slave statusG;
配置完成。