mysql 多实例部署
使用多个配置文件启动不同的进程来实现多实例，这种方式的优势逻辑简单，配置简单，缺点是管理起来不太方便。
使用多个配置文件启动多个不同进程的情况：
环境介绍：
mysql 版本：5.6.20
操作系统：centos
mysql实例数：2个
实例占用端口分别为：3306、3307
操作用户：root
编译安装mysql
tar xzvf mysql.tar.gz
cd mysql
初始化数据库
/opt/app/mysql/bin/mysql_install_db --basedir=/opt/app/mysql --datadir=/dbdata_3306
/opt/app/mysql/bin/mysql_install_db --basedir=/opt/app/mysql --datadir=/dbdata_3307
创建配置文件
vim /dbdata_3306/my.cnf
3306的配置文件如下：
[mysqld]
character_set_client=utf8
character-set-server=utf8
socket=/opt/app/mysql/data_3306/mysql.sock
basedir=/opt/app/mysql
datadir=/opt/app/mysql/data_3306
user=mysql
port=3306
skip_name_resolve=1
innodb_force_recovery = 0
# --------------- #
# Slowlog Options #
# --------------- #
slow-query-log=1
slow-query-log-file=/var/log/mysql/query_slow.log
# --------------- #
# MyISAM Options #
# --------------- #
key_buffer_size=64M #64M
query_cache_size=256M
table_open_cache=512 #1024
sort_buffer_size=6M #4M
thread_cache_size=64
# --------------- #
# InnoDB Options #
# --------------- #
innodb_buffer_pool_size=1024M
innodb_file_per_table
innodb_lock_wait_timeout=60
innodb_rollback_on_timeout=1
innodb_log_file_size=100M
innodb_log_buffer_size=2M #4M
innodb_flush_log_at_trx_commit=2
innodb_thread_concurrency=48 #8
innodb_flush_method=O_DIRECT
# ------------------ #
# performance tuning #
# ------------------ #
max_connections=16384
max_connect_errors=1844674407370954751
connect_timeout=20
table_open_cache=5120 #2726
read_rnd_buffer_size=16M
back_log=512 #384
max_allowed_packet=64M #32M
thread_stack=256K
read_buffer_size=8M
join_buffer_size=16M
myisam_sort_buffer_size=128M
tmp_table_size=512M #512M
max_heap_table_size=1024M #512M
thread_concurrency=4 #16cores logic CPU*2
#binlog_cache_size=4M
query_cache_limit=32M
wait_timeout=43200
interactive_timeout=43200
# -------------- #
# binlog options #
# -------------- #
server_id=103
binlog_cache_size = 1M
max_binlog_cache_size = 512M
max_binlog_size = 512M
log-bin = binlog
binlog_format = mixed
expire_logs_days = 1
[mysqld_safe]
log-error=/var/log/mysqld_3306.log
pid-file=/var/log/mysql/mysqld_3306.pid
vim /dbdata_3307/my.cnf
3307的配置文件如下：（同3306将3306端口修改成33077）
启动mysql:
/opt/app/mysql/bin/mysqld --defaults-file=/opt/app/mysql/data_3306/my.cnf &
/opt/app/mysql/bin/mysqld --defaults-file=/opt/app/mysql/data_3307/my.cnf &
添加权限：
/opt/app/mysql/bin/mysql -uroot -proot -S /opt/app/mysql/dbdata_3306/mysql.sock
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' identified by 'root' with grant option;
flush privileges;
/opt/app/mysql/bin/mysql -uroot -proot -S /opt/app/mysql/dbdata_3307/mysql.sock
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' identified by 'root' with grant option;
flush privileges;