一台服务器上面启动多个mysql事例（一看就会）

一台服务器上面启动多个mysql事例（一看就会）

    如今每台服务器上面都有相应的数据库，为了实现数据安全，采用主从复制进行备份，可是若是一对一的进行备份就太浪费资源，因此主库向一个数据库进行主从又在安全上没有保障，当这个库挂了，全部的备份也就挂了，并且管理起来也至关的不方便，因此我就选择使用mysql_multi实现一台机器上跑多台mysql，

一：首先在/etc/my.cnf配置文件中添加信息，分配好他们的进程号、占用端口号、数据存放路径、pid文件。

[mysqld_multi]

mysqld = /usr/local/mysql/bin/mysqld_safe

mysqladmin = /usr/local/mysql/bin/mysqladmin

log = /app/log/mysqld_multi.log

user = root                             

password = meiyu#super^^

[mysqld1]

socket = /app/mysql1/mysqld_3306.sock

port = 3306

pid-file = /app/mysql1/mysqld3306.pid

datadir = /app/mysql1

log-error = /app/mysql1/err-3306.log

server-id=373306

[mysqld2]

socket = /app/mysql2/mysqld_3307.sock

port = 3307

pid-file = /app/mysql2/mysqld3307.pid

datadir = /app/mysql2

log-error = /app/mysql2/err-3307.log

server-id=373307

[mysqld3]

socket = /app/mysql3/mysqld_3308.sock

port = 3308

pid-file = /app/mysql3/mysqld3308.pid

datadir = /app/mysql3

log-error = /app/mysql3/err-3308.log

server-id=373308

character-set-server=utf8

innodb_file_per_table = 1

query_cache_type = 0

max_prepared_stmt_count = 1000000

table_definition_cache = 1000

innodb_flush_method=O_DIRECT

innodb_adaptive_flushing=1

innodb_io_capacity=10000

max_connections = 10000

max_connect_errors = 10000000000

table_open_cache = 500

max_allowed_packet = 16M

#binlog_cache_size = 1M

max_heap_table_size = 64M

read_buffer_size = 2M

read_rnd_buffer_size = 16M

sort_buffer_size = 2M

join_buffer_size = 2M

thread_cache_size = 10000

thread_concurrency = 16

query_cache_size = 0

query_cache_limit = 0

ft_min_word_len = 4

default-storage-engine = INNODB

thread_stack = 192K

transaction_isolation = READ-COMMITTED

tmp_table_size = 64M

#log-bin=mysql-bin

#binlog_format=mixed

slow_query_log

log-queries-not-using-indexes

long_query_time = 1

key_buffer_size = 16M

bulk_insert_buffer_size = 8M

#myisam_sort_buffer_size = 16M

#myisam_max_sort_file_size = 3G

#myisam_repair_threads = 1

#myisam_recover

innodb_additional_mem_pool_size = 8M

innodb_buffer_pool_size = 3G

innodb_data_file_path = ibdata1:512M:autoextend

innodb_autoextend_increment = 100

innodb_write_io_threads = 16

innodb_read_io_threads = 8

innodb_thread_concurrency = 0

innodb_flush_log_at_trx_commit = 2

innodb_log_buffer_size = 1M

innodb_log_file_size = 32M

innodb_log_files_in_group = 3

innodb_max_dirty_pages_pct = 60

innodb_lock_wait_timeout = 120

skip_name_resolve

[mysqldump]

quick

max_allowed_packet = 16M

[mysql]

no-auto-rehash

[myisamchk]

#key_buffer_size = 512M

#sort_buffer_size = 512M

#read_buffer = 8M

#write_buffer = 8M

[mysqlhotcopy]

interactive-timeout

在每一个添加的mysql添加上他们的路径，给他们添加权限（很重要的）

二：作完这些简单的配置以后，咱们就要建立实例

/usr/local/mysql/scripts/mysql_install_db --defaults-file=/etc/my.cnf --datadir=/app/mysql1 --user=mysql --basedir=/usr/local/mysql/

/usr/local/mysql/scripts/mysql_install_db --defaults-file=/etc/my.cnf --datadir=/app/mysql2 --user=mysql --basedir=/usr/local/mysql/

/usr/local/mysql/scripts/mysql_install_db --defaults-file=/etc/my.cnf --datadir=/app/mysql3 --user=mysql --basedir=/usr/local/mysql/

建立完事例，以后咱们在启动一下咱们的配置文件

/usr/local/mysql/bin/mysqld_multi start 1,2,3

启动事例完以后，咱们就能够查看咱们的配置的节点有没有报错，是否能成功

/app/mysql/bin/mysqld_multi report

咱们再查看一下端口号是否起来，netstat –tnlp

检验节点没有错误，端口正常启动，最后一步咱们看一下mysq事例是否能登录进去

mysql -uroot -p -S /tmp/mysql.sock01

这样把多个事例的配置文件放在了一个里面，在作主从的话就不怎么方便了，若是我想作主从的话，在第一步设置的时候就把配置文件单独存放一个路径。