配置MySQL数据库多实例
时间：2021-07-01 10:21:17
帮助过：47人阅读
一、什么是mysql多实例
简单的说就是在一台机器上开启多个不同的服务端口（例如：3306、3307），运行多个mysql服务进程，这些服务进程通过不同的socket监听不同的服务端口来提供各自的服务。
这些mysql多实例共用一套mysql安装程序，使用不同（也可以相同）的my.cnf配置文件、启动程序、数据文件。在提供服务时，多实例mysql在逻辑上看来是各自独立的，多个实例是根据配置文件中配置的参数来获取服务器相关硬件资源。
二、mysql常见应用场景
由于公司业务访问量不是很大，服务器的资源基本都是浪费的，这时候很适合使用多实例的应用，如果对SQL语句优化做的比较好，mysql多实例是一个很值得使用的技术，即使并发很大，合理分配系统资源，也不会有太大问题。
三、mysql多实例常见配置方案
3.1 安装mysql数据库
具体安装方法，请参见 编译方式安装MySQL数据库 。
3.2 配置多实例
3.2.1 创建多实例目录
[root@mysql-multi ~]# mkdir -p /data/{3306,3307}/data
[root@mysql-multi ~]# tree /data
/data
├── 3306
│ └── data
└── 3307
└── data 3.2.2 将数据目录及临时目录授权mysql用户（在安装mysql之前已经创建mysql用户组和用户）
[root@mysql-multi ~]# chown -R mysql.mysql /data
[root@mysql-multi ~]# chmod -R 1777 /tmp
[root@mysql-multi ~]# ls -ld /data/{3306,3307}/data
drwxr-xr-x. 2 mysql mysql 4096 1月 18 22:40 /data/3306/data
drwxr-xr-x. 2 mysql mysql 4096 1月 18 22:40 /data/3307/data 3.2.3 创建配置文件my.cnf
3306端口
| 3307端口
|
[client]
port = 3306
socket = /data/3306/mysql.sock
[mysql]
no-auto-rehash
[mysqld]
user = mysql
port = 3306
socket = /data/3306/mysql.sock
basedir = /application/mysql
datadir = /data/3306/data
open_files_limit = 1024
back_log = 600
max_connections = 800
max_connect_errors = 3000
table_cache = 614
external-locking = FALSE
max_allowed_packet =8M
sort_buffer_size = 1M
join_buffer_size = 1M
thread_cache_size = 100
thread_concurrency = 2
query_cache_size = 2M
query_cache_limit = 1M
query_cache_min_res_unit = 2k
#default_table_type = InnoDB
thread_stack = 192K
#transaction_isolation = READ-COMMITTED
tmp_table_size = 2M
max_heap_table_size = 2M
long_query_time = 1
#log_long_format
#log-error = /data/3306/error.log
#log-slow-queries = /data/3306/slow.log
pid-file = /data/3306/mysql.pid
log-bin = /data/3306/mysql-bin
relay-log = /data/3306/relay-bin
relay-log-info-file = /data/3306/relay-log.info
binlog_cache_size = 1M
max_binlog_cache_size = 1M
max_binlog_size = 2M
expire_logs_days = 7
key_buffer_size = 16M
read_buffer_size = 1M
read_rnd_buffer_size = 1M
bulk_insert_buffer_size = 1M
#myisam_sort_buffer_size = 1M
#myisam_max_sort_file_size = 10G
#myisam_max_extra_sort_file_size = 10G
#myisam_repair_threads = 1
#myisam_recover
lower_case_table_names = 1
skip-name-resolve
slave-skip-errors = 1032,1062
replicate-ignore-db=mysql server-id = 1 innodb_additional_mem_pool_size = 4M
innodb_buffer_pool_size = 32M
innodb_data_file_path = ibdata1:128M:autoextend
innodb_file_io_threads = 4
innodb_thread_concurrency = 8
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 2M
innodb_log_file_size = 4M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120
innodb_file_per_table = 0
[mysqldump]
quick
max_allowed_packet = 2M
[mysqld_safe]
log-error=/data/3306/err_mysql_3306.err
pid-file=/data/3306/mysqld.pid | [client]
port = 3307
socket = /data/3307/mysql.sock
[mysql]
no-auto-rehash
[mysqld]
user = mysql
port = 3307
socket = /data/3307/mysql.sock
basedir = /application/mysql
datadir = /data/3307/data
open_files_limit = 1024
back_log = 600
max_connections = 800
max_connect_errors = 3000
table_cache = 614
external-locking = FALSE
max_allowed_packet =8M
sort_buffer_size = 1M
join_buffer_size = 1M
thread_cache_size = 100
thread_concurrency = 2
query_cache_size = 2M
query_cache_limit = 1M
query_cache_min_res_unit = 2k
#default_table_type = InnoDB
thread_stack = 192K
#transaction_isolation = READ-COMMITTED
tmp_table_size = 2M
max_heap_table_size = 2M
#long_query_time = 1
#log_long_format
#log-error = /data/3307/error.log
#log-slow-queries = /data/3307/slow.log
pid-file = /data/3307/mysql.pid
#log-bin = /data/3307/mysql-bin
relay-log = /data/3307/relay-bin
relay-log-info-file = /data/3307/relay-log.info
binlog_cache_size = 1M
max_binlog_cache_size = 1M
max_binlog_size = 2M
expire_logs_days = 7
key_buffer_size = 16M
read_buffer_size = 1M
read_rnd_buffer_size = 1M
bulk_insert_buffer_size = 1M
#myisam_sort_buffer_size = 1M
#myisam_max_sort_file_size = 10G
#myisam_max_extra_sort_file_size = 10G
#myisam_repair_threads = 1
#myisam_recover
lower_case_table_names = 1
skip-name-resolve
slave-skip-errors = 1032,1062
replicate-ignore-db=mysql server-id = 3 innodb_additional_mem_pool_size = 4M
innodb_buffer_pool_size = 32M
innodb_data_file_path = ibdata1:128M:autoextend
innodb_file_io_threads = 4
innodb_thread_concurrency = 8
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 2M
innodb_log_file_size = 4M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120
innodb_file_per_table = 0
[mysqldump]
quick
max_allowed_packet = 2M
[mysqld_safe]
log-error=/data/3307/err_mysql_3307.err
pid-file=/data/3307/mysqld.pid |
配置MySQL数据库多实例
标签：mysql 多实例 主从复制
