mysql主从服务搭建、主主服务搭建

mysql主从服务搭建

安装MySQL
以下配置基于安装时的配置

一. 主数据库

1. 修改配置文件my.cnf

   auto_increment_increment=2
   auto_increment_offset=1
   character_set_server=utf8
   log-bin-trust-function-creators=1
   

   重要参数说明:
   log_bin：启动mysql二进制日志，如果没有配置这个将无法远程链接
   server-id：须保证每台mysql主机不重复
   auto_increment_increment：步进值auto_imcrement，一般有n台主MySQL就填n
   auto_increment_offset：设定数据库中自动增长的起点，两台mysql的起点必须不同，这样才能避免两台服务器同步时出现主键冲突

   完整示例配置,(同步所有数据库)：

   [mysqld]
   user = mysql
   basedir = /usr/local/mysql
   datadir = /home/mysql/data
   port = 3306
   socket = /home/mysql/tmp/mysql.sock
   pid-file = /home/mysql/tmp/mysqld.pid
   tmpdir = /home/mysql/tmp
   skip_name_resolve = 1
   symbolic-links=0
   max_connections = 2000
   group_concat_max_len = 1024000
   sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
   lower_case_table_names = 1
   log_timestamps=SYSTEM
   character-set-server = utf8
   interactive_timeout = 2880000
   wait_timeout = 2880000
   max_allowed_packet = 1G
   binlog_cache_size = 32M
   sort_buffer_size = 16M
   read_buffer_size = 16M
   join_buffer_size = 16M
   tmp_table_size = 96M
   max_heap_table_size = 96M
   max_length_for_sort_data = 8096
   auto_increment_increment=2
   auto_increment_offset=1
   #logs
   server-id = 102
   log-error = /home/mysql/logs/error.log
   slow_query_log = 1
   slow_query_log_file = /data/mysql/logs/slow.log
   long_query_time = 3
   log-bin = /home/mysql/logs/binlog
   binlog_format = row
   expire_logs_days = 15
   sync_binlog = 1
   binlog_checksum = crc32
   binlog_format = mixed
   log_bin_trust_function_creators = 1
   relay-log = /home/mysql/logs/relay-bin
   relay-log-recovery = 1
   relay_log_purge = 1
   #innodb
   innodb_file_per_table = 1
   innodb_log_buffer_size = 16M
   innodb_log_file_size = 256M
   innodb_log_files_in_group = 2
   innodb_io_capacity = 2000
   innodb_io_capacity_max = 4000
   innodb_flush_neighbors = 0
   innodb_flush_method = O_DIRECT
   innodb_autoinc_lock_mode = 2
   innodb_read_io_threads = 8
   innodb_write_io_threads = 8
   innodb_buffer_pool_size = 2G
   [client]
   default-character-set=utf8
   [mysql]
   default-character-set=utf8
   

2. 重启数据库并创建从节点用户和授权

   # 重启mysql
   systemctl restart mysql
   #登录mysql
   mysql -u root -p
   #创建用户
   grant replication slave, replication client on *.* to '103'@'10.42.11.103' identified by '123';
   #刷新
   flush privileges;
   #查看日志(记录下来，需要用到)
   show master status;
   

   

二、 从数据库

1. 修改配置文件my.cnf
   配置和主数据库的配置相同就行了，注意部分参数需要保证是唯一的

2. 设置同步节点

   change master to master_host='10.42.11.102', master_port=3306, master_user='103', master_password='123', master_log_file='binlog.000005', master_log_pos=621;
   

   这里master_user就是上面主数据库创建的用户，master_log_file和master_log_pos就是上面日志中的file和position

3. 启动同步

   start slave;
   

4. 查看同步状态

   show slave status\G;
   

   

三、 MySQL主主服务搭建

1. 在从服务器上执行上面的主数据库的第2步
2. 在主数据库上执行上面从数据的2、3步