同一台MySQL服务器启动多个端口

这里是安装好mysql数据库后再更改配置文件
配置前先备份下/etc/my.cnf文件
配置文件要编辑成这样 vim /etc/my.cnf.将原来[mysqld]字段以下内容去除然后添加如下两个字段
[mysqld0]
port            = 3300
socket          = /tmp/mysql0.sock
pid-file        = /home/mysql0/localhost.localdomain0.pid
datadir         = /home/mysql0
log            = /home/mysql0/mysql0.log
user            = mysql
skip-locking
skip-name-resolve
#skip-bdb
#skip-innodb
key_buffer = 128M
max_allowed_packet = 1M
table_cache = 864
sort_buffer_size = 1M
read_buffer_size = 512K
read_rnd_buffer_size = 1M
myisam_sort_buffer_size = 32M
thread_cache_size = 16
query_cache_size = 32M
thread_concurrency = 8
#skip-networking
wait_timeout=8
max_connections=512
max_connect_errors = 10000000
max_user_connections=20
#slow_queries=/data/mysql0slowquer.sql
#log_slow_queries=/data/mysql0slowquer.sql
#long_query_time=3
#log-bin=mysql0-bin
###########################
[mysqld1]
port            = 3301
socket          = /tmp/mysql1.sock
pid-file        = /home/mysql1/localhost.localdomain1.pid
datadir         = /home/mysql1
log            = /home/mysql1/mysql1.log
user            = mysql
skip-locking
skip-name-resolve
#skip-innodb
#skip-bdb
key_buffer = 128M
max_allowed_packet = 1M
table_cache = 864
sort_buffer_size = 1M
read_buffer_size = 512K
read_rnd_buffer_size = 1M
myisam_sort_buffer_size = 32M
thread_cache_size = 16
query_cache_size = 32M
thread_concurrency = 8
#skip-networking
wait_timeout=8
max_connections=512
max_connect_errors = 10000000
max_user_connections=20
#log_slow_queries=/data/mysql1slowquer.sql
#long_query_time=3
#log-bin=mysql1-bin
########################################
保存完后将mysqld的服务停止。

然后初始化：./scripts/mysql_install_db --datadir=/home/mysql0 --user=mysql
                    ./scripts/mysql_install_db --datadir=/home/mysql1 --user=mysql

因为是多个端口，所以要根据配置文件来初始化多个数据库，比如说有2个端口则要运行两次 。

最后就该启动了
/usr/local/mysql/bin/mysqld_multi start 0或者1  这里的0或1是根据配置文件中"[mysqld0]"来定的。

最后登录mysql -uroot -S /tmp/mysql1.sock 来进行登录mysql1