Step 1 . 准备工作
关闭防火墙; 安装 MySQL依赖于libaio 库；下载，解压，重命名 MySQL的执行文件；新建用户组和用户 等准备工作在此不再赘述。
可执行文件目录为 /data/mysql57
添加用户和组的指令
groupadd mysqluseradd mysql -g mysql
Step 2 . 添加环境变量
在/etc/profile文件中，追加 PATH=${PATH}:/data/mysql57/bin/
保存后，如需要立即生效，可执行 source /etc/profile 。
step 3 . 创建目录并授权
在data根目录下执行
mkdir -p mysql3306/data mysql3306/mysql_log mysql3306/tmp mysql3307/data mysql3307/mysql_log mysql3307/tmp mysqld_multi/log
创建记录log的文件，此步骤不可少。
touch /data/mysql3306/mysql_log/mysql3306.errtouch /data/mysql3307/mysql_log/mysql3307.err
赋予目录和文件权限
chown -R mysql.mysql mysql3* mysqld_multi
在本测试案例中，mysql57是从其它服务上copy来的，不是直接下载解压的，所以多了下面的两步授权操作。
chmod -R 755 /data/mysql57/bin
chmod -R 755 /data/mysql57/support-files
step 4 . 编辑my.cnf
[client]host=localhostsocket = /tmp/mysql.sock default-character-set=utf8mb4#loose-local-infile=0[mysqld]user=mysqllog_bin_trust_function_creators=1secure_file_priv='/tmp'########server setting#######sql_mode = "ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"character-set-server=utf8mb4collation_server=utf8mb4_unicode_cilower_case_table_names = 0skip_name_resolve = 1#max_connect_errors = 1000max_connections = 2000thread_cache_size=256#thread_stack= 262144#back_log=80max_allowed_packet = 134217728event_scheduler = 1 local-infile=0#lower_case_table_names = 1explicit_defaults_for_timestamp = 1expire_logs_days = 7log_bin_trust_function_creators =1####.frm/.ibd files qty relatedopen_files_limit=65535innodb_open_files=65535table_open_cache=65535table_definition_cache=65535#### seesion buffer relatedread_buffer_size = 262144read_rnd_buffer_size = 524288sort_buffer_size = 8388608join_buffer_size = 8388608####memory table size tmp_table_size =67108864max_heap_table_size=67108864####timeoutinteractive_timeout = 1800wait_timeout = 1800# connect_timeout=10########slow query ########slow_query_log = 1log_slow_slave_statements = 1#log_queries_not_using_indexes = 1log_throttle_queries_not_using_indexes = 10long_query_time = 1#min_examined_row_limit = 10000########innodb settings########innodb_buffer_pool_size = 10737418240innodb_buffer_pool_instances = 16 innodb_buffer_pool_dump_pct = 40innodb_lru_scan_depth = 2048innodb_page_cleaners = 16#innodb_purge_threads = 4innodb_sort_buffer_size = 67108864#innodb_file_per_table = 1#innodb_flush_log_at_trx_commit = 1innodb_undo_log_truncate = 1innodb_undo_tablespaces = 3 innodb_max_undo_log_size = 2147483648innodb_purge_rseg_truncate_frequency = 128innodb_log_file_size = 1073741824innodb_log_files_in_group = 3innodb_log_buffer_size = 16777216innodb_flush_method = O_DIRECTinnodb_flush_neighbors = 0innodb_print_all_deadlocks = 1innodb_strict_mode = 1#innodb_lock_wait_timeout = 50innodb_io_capacity = 32768innodb_io_capacity_max = 65536innodb_thread_concurrency = 32innodb_write_io_threads = 8innodb_read_io_threads = 8########replication settings########master_info_repository = TABLErelay_log_info_repository = TABLEgtid_mode = onenforce_gtid_consistency = 1binlog_gtid_simple_recovery=1relay_log_recovery = 1slave-parallel-type = LOGICAL_CLOCKslave-parallel-workers = 16slave_transaction_retries=128slave_preserve_commit_order=1log_slave_updates=1binlog_format = ROWlog_timestamps=systembinlog_rows_query_log_events = 1binlog_row_image='full' slave_skip_errors = ddl_exist_errors########semi sync replication settings##########plugin_dir=/data/mysql/plugin/#plugin_load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"#rpl_semi_sync_master_enabled = 1#rpl_semi_sync_master_timeout = 5000#rpl_semi_sync_slave_enabled = 1[mysqld_multi]mysqld = /data/mysql57/bin/mysqld_safemysqladmin = /data/mysql57/bin/mysqladminlog = /data/mysqld_multi/log/mysqld_multi.log[mysqld3306] basedir = /data/mysql57mysqladmin=mysqladmindatadir=/data/mysql3306/dataport=3306 server_id=102473306socket= /tmp/mysql_3306.socktmpdir = /data/mysql3306/tmppid-file = /data/mysql3306/mysql_log/mysql3306.pidslow_query_log_file = /data/mysql3306/mysql_log/mysql3306_slow_new.log log-error = /data/mysql3306/mysql_log/mysql3306.errgeneral_log_file= /data/mysql3306/mysql_log/mysql3306.genloglog-bin = /data/mysql3306/mysql_log/mysql3306_binrelay_log = /data/mysql3306/mysql_log/relay3306.loginnodb_buffer_pool_size = 90Ginnodb_buffer_pool_instances = 8[mysqld3307]basedir = /data/mysql57mysqladmin=mysqladmindatadir=/data/mysql3307/dataport=3307server_id=102473307socket= /tmp/mysql_3307.socktmpdir = /data/mysql3307/tmppid-file = /data/mysql3307/mysql_log/mysql3307.pidslow_query_log_file = /data/mysql3307/mysql_log/mysql3307_slow_new.loglog-error = /data/mysql3307/mysql_log/mysql3307.errgeneral_log_file= /data/mysql3307/mysql_log/mysql3307.genloglog-bin = /data/mysql3307/mysql_log/mysql3307_binrelay_log = /data/mysql3307/mysql_log/relay3307.loginnodb_buffer_pool_size = 90Ginnodb_buffer_pool_instances = 8[mysqldump]quick
step 5 . 初始化实例
初始化3306端口的实例，注意产生的临时密码。
/data/mysql57/bin/mysqld --defaults-file=/etc/my.cnf --initialize --user=mysql --basedir=/data/mysql57 --datadir=/data/mysql3306/data
初始化3307端口的实例，注意产生的临时密码。
/data/mysql57/bin/mysqld --defaults-file=/etc/my.cnf --initialize --user=mysql --basedir=/data/mysql57 --datadir=/data/mysql3307/data
step 6 . 复制生成mysqld_multi并添加到开机启动
cp /data/mysql57/support-files/mysqld_multi.server /etc/init.d/mysqld_multi
chkconfig --add mysqld_multi
step 7 . 多实例Mysqld的开启
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开启全部实例
mysqld_multi start
查看开启情况（查看全部实例状态）
mysqld_multi report
开启指定实例
开启/etc/my.cnf中[mysqld3306]其中mysqld后面的数字为标签，例如3306标签
mysqld_multi start 3306
同样开启3307标签实例
mysqld_multi start 3307
（注意：此处没有说通过 mysqld_multi stop 命令进行关闭实例，为什么不说，因为命令无效。Step 9 的操作会让它变成有效）
step 8 . 第一次登入实例，修改root账号密码
多实例登入需指定 socket 参数
本测试3306实例登入的方式为：
mysql -S /tmp/mysql_3306.sock -uroot --port 3306 -p
step 9 . 赋予通过mysqld_multi stop关闭实例的权限。
关闭实例需要配置root用户及密码， 修改 /etc/my.cnf文件。
在 [client] 位置添加
user=rootpassword=密码
因为文件中需要保留账号密码，有安全风险。实际环境中要不要如此设置，还需根据具体情况和安全要求而定。
经过以上步骤的操作，此服务器成功安装了2个MySQL实例，一个Port为3306，另一个Port为3307
以上就是MySQL 多实例的安装的详细内容，更多请关注创想鸟其它相关文章！
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