安装多实例之前首先需要先安装mysql，这里就不介绍如何安装mysql了，参考前面的博客：https://www.cnblogs.com/hei-ma/p/9505509.html
安装多实例之前需要将之前安装好的mysql停掉。
# /etc/init.d/mysqld stop
开始正式安装mysql-5.7.19多实例
1、创建多实例目录
# mkdir -p /data/mysql{3307,3308}/data
2、编辑多实例配置文件
3308端口的需要将3307修改为3308，server-id也需要改
# cat /data/mysql3307/my.cnf [client] port = 3307 socket = /data/mysql3307/mysql.sock [mysql] no-auto-rehash [mysqld] secure_file_priv = user = mysql port = 3307 socket = /data/mysql3307/mysql.sock basedir = /usr/local/mysql datadir = /data/mysql3307/data open_files_limit = 1024 back_log = 600 max_connections = 800 max_connect_errors = 3000 table_open_cache = 614 external-locking = FALSE max_allowed_packet =8M sort_buffer_size = 1M join_buffer_size = 1M thread_cache_size = 100 query_cache_size = 2M query_cache_limit = 1M query_cache_min_res_unit = 2k thread_stack = 192K tmp_table_size = 2M max_heap_table_size = 2M pid-file = /data/mysql3307/mysql.pid log-bin = /data/mysql3307/mysql-bin relay-log = /data/mysql3307/relay-bin relay-log-info-file = /data/mysql3307/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 lower_case_table_names = 1 skip-name-resolve slave-skip-errors = 1032,1062 replicate-ignore-db=mysql server-id = 6 innodb_buffer_pool_size = 32M innodb_data_file_path = ibdata1:128M:autoextend 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/mysql3307/mysql_3307.err pid-file=/data/mysql3307/mysqld.pid
3、创建用户并授权
# useradd -s /sbin/nologin -M mysql # chown -R mysql.mysql /data/mysql330*
4、初始化
# cd /mysql-path/bin #进入到你的mysql安装路径 # ./mysqld --defaults-file=/data/mysql3307/my.cnf --basedir=/usr/local/mysql --user=mysql --initialize-insecure --explicit_defaults_for_timestamp # echo $? #确认初始化是否成功，返回0则成功
5、启动多实例
# cd /mysql-path/bin #mysql的安装路径 # ./mysqld_safe --defaults-file=/data/mysql3307/my.cnf & #启动mysql
6、确认进程
# ps -ef|grep /data/mysql3307 #查看进程 root 11893 7522 0 16:19 pts/3 00:00:00 /bin/sh ./mysqld_safe --defaults-file=/data/mysql3307/my.cnf mysql 12562 11893 0 16:19 pts/3 00:00:01 /usr/local/mysql/bin/mysqld --defaults-file=/data/mysql3307/my.cnf --basedir=/usr/local/mysql --datadir=/data/mysql3307/data --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/data/mysql3307/mysql_3307.err --open-files-limit=1024 --pid-file=/data/mysql3307/mysqld.pid --socket=/data/mysql3307/mysql.sock --port=3307 root 12926 7522 0 16:46 pts/3 00:00:00 grep --color=auto /data/mysql3307 # netstat -lnutp|grep 3307 #查看端口 tcp6 0 0 :::3307 :::* LISTEN 12562/mysqld
至此3307的多实例就配置完成了！！
3308的配置和3307一样，但是需要修改配置文件