一臺服務器上面啓動多個mysql事例（一看就會）

一臺服務器上面啓動多個mysql事例（一看就會）

    如今每臺服務器上面都有相應的數據庫，爲了實現數據安全，採用主從複製進行備份，可是若是一對一的進行備份就太浪費資源，因此主庫向一個數據庫進行主從又在安全上沒有保障，當這個庫掛了，全部的備份也就掛了，並且管理起來也至關的不方便，因此我就選擇使用mysql_multi實現一臺機器上跑多臺mysql，

一：首先在/etc/my.cnf配置文件中添加信息，分配好他們的進程號、佔用端口號、數據存放路徑、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

在每一個添加的mysql添加上他們的路徑，給他們添加權限（很重要的）

二：作完這些簡單的配置以後，咱們就要建立實例

/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，以後咱們在啓動一下咱們的配置文件

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

啓動事例完以後，咱們就能夠查看咱們的配置的節點有沒有報錯，是否能成功

/app/mysql/bin/mysqld_multi report

咱們再查看一下端口號是否起來，netstat –tnlp

檢驗節點沒有錯誤，端口正常啓動，最後一步咱們看一下mysq事例是否能登錄進去

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

這樣把多個事例的配置文件放在了一個裏面，在作主從的話就不怎麼方便了，若是我想作主從的話，在第一步設置的時候就把配置文件單獨存放一個路徑。