mysql 配置檔案載入位置與順序：
1./usr/local/mysql/bin/mysqld –verbose –help >help.txt 2>&1
(/usr/local/mysql/bin/mysqld –verbose –help 這個命令生成所有mysqld選項和可配置變數的列表 然後重定向到help.txt，標準錯誤也重定向到這個檔案中)
2.檢視這個檔案：vi help.txt
3.搜尋my.cnf:
from
the following files in
thegiven order:
(預設選項在給定的順序從下列檔案中讀取：)
/etc/my.cnf /etc/mysql/my.cnf /usr/local/mysql/etc/my.cnf ~/.my.cnf
the following groups are read: mysqld server mysqld-5.7
the following options may be given
asthe
first argument:
--print-defaults print the program argument list and exit.
--defaults-file=# only read default options from the given file #.（載入指定的不載入其他）
--defaults-extra-file=# read this file after the global files are read.
（載入預設的之後在載入指定的）
so：my.cnf是按照這個順序讀取的，如果有那個配置不一樣但是有多個my.cnf是按照最後乙個配置為準的
1、mysqld
啟動mysql伺服器:./mysqld –defaults-file=/etc/my.cnf –user=root
客戶端連線:
mysql –defaults-file=/etc/my.cnf
or mysql -s /tmp/mysql.sock
2、mysqld_safe
啟動mysql伺服器:./mysqld_safe –defaults-file=/etc/my.cnf –user=root &
客戶端連線:
mysql –defaults-file=/etc/my.cnf
or mysql -s /tm/mysql.sock
3、mysql.server
cp -v /usr/local/mysql/support-files/mysql.server /etc/init.d/
chkconfig –add mysql.server
啟動mysql伺服器:service mysql.server
客戶端連線:同1、2
4、mysqld_multi
mkdir $mysql_base/data2
cat <<-eof>> /etc/my.cnf
[mysqld_multi]
mysqld = /usr/local/mysql/bin/mysqld_safe
mysqladmin = /user/local/mysql/bin/mysqladmin
user = mysqladmin
password = mysqladmin
[mysqld3306]
port = 3306
socket = /tmp/mysql3306.sock
pid-file = /tmp/mysql3306.pid
skip-external-locking
key_buffer_size = 16m
max_allowed_packet = 1m
table_open_cache = 64
sort_buffer_size = 512k
net_buffer_length = 8k
read_buffer_size = 256k
read_rnd_buffer_size = 512k
myisam_sort_buffer_size = 8m
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
[mysqld3307]
port = 3307
socket = /tmp/mysql3307.sock
pid-file = /tmp/mysql3307.pid
skip-external-locking
key_buffer_size = 16m
max_allowed_packet = 1m
table_open_cache = 64
sort_buffer_size = 512k
net_buffer_length = 8k
read_buffer_size = 256k
read_rnd_buffer_size = 512k
myisam_sort_buffer_size = 8m
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data2
eofmysql>grant shutdown on . to 『mysqladmin』@』localhost』 identified by 『mysqladmin』 with grant option;
mysql>grant shutdown on . to 『mysqladmin』@』localhost』 identified by 『mysqladmin』 with grant option;
啟動mysql伺服器:./mysqld_multi –defaults-file=/etc/my.cnf start 3306-3307
關閉mysql伺服器:mysqladmin shutdown
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