注意事项：
只要做到以下4点，2个mysql就可以同时安装到一台机器ps：可以举一反三，一台机器只要你的负载够的话，想安装几个都可以。下面以2个为例：
我的测试服务器配置为2个6核cpu 48g内存 4t硬盘，安装主从测试之后10w的并发基本是上限。
2个mysql安装到一台服务器
1.socket文件不同
2.data文件不同
3.配置文件不同
4.mysql端口不同
安装步骤：
第一个mysql5.6正常安装：
groupadd mysql
useradd -s /sbin/nologin -M -g mysql mysql
tar -zxvf mysql-5.6.25.tar.gz
cd mysql-5.6.25
cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DEXTRA_CHARSETS=all -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DWITH_READLINE=1 -DWITH_SSL=system -DWITH_ZLIB=system -DWITH_EMBEDDED_SERVER=1 -DENABLED_LOCAL_INFILE=1
cp support-files/my-default.cnf /etc/my.cnf
vi /etc/my.cnf
#加入优化的mysql配置：
###查看mysql innodb 5.5版本 show engine innodb status\G;
###注意:innodb 一定要在初始化之前加入配置文件
###5.6版本需要去掉#log_slow_queries=/usr/local/mysql/slow-log.log
###需要chmod 777 /tmp
[client]
#password = your_password
port = 3306
socket = /tmp/mysql.sock
# Here follows entries for some specific programs
# The MySQL server
[mysqld]
port = 3306
socket = /tmp/mysql.sock
skip-external-locking
max_allowed_packet = 32M
table_open_cache = 2048
net_buffer_length = 1M
character-set-server = utf8
skip-name-resolve
ft_min_word_len = 4
#### performance ####
open_files_limit = 10240
max_connections = 800
max_connect_errors = 6000
thread_stack = 192K
transaction_isolation = REPEATABLE-READ
tmp_table_size = 256M
max_heap_table_size = 256M
slow_query_log
long_query_time = 1
#log_slow_queries=/usr/local/mysql/slow-log.log
net_buffer_length = 1M
#### log ####
log-error=/usr/local/mysql/mysqld.err
back_log = 500
max_binlog_cache_size = 8M
max_binlog_size = 512M
binlog_format=mixed
expire_logs_days = 7
#### buffer && cache ####
read_buffer_size = 10M
read_rnd_buffer_size = 32M
sort_buffer_size = 2M
join_buffer_size = 2M
thread_cache_size = 300
thread_concurrency = 8
query_cache_size = 64M
query_cache_limit = 4M
binlog_cache_size = 4M
key_buffer_size = 32M
bulk_insert_buffer_size = 64M
#### myisam ####
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1
myisam_recover
log-bin=mysql-bin
server-id = 1
innodb_data_home_dir = /usr/local/mysql/data
innodb_data_file_path = ibdata1:10M:autoextend
innodb_log_group_home_dir = /usr/local/mysql/data
innodb_buffer_pool_size = 1G
innodb_additional_mem_pool_size = 16M
innodb_log_file_size = 150M
innodb_log_buffer_size = 16M
innodb_flush_log_at_trx_commit =2
innodb_lock_wait_timeout = 60
innodb_flush_method = O_DIRECT
innodb_open_files = 800
innodb_file_per_table=1
innodb_file_io_threads=4
[mysqldump]
quick
max_allowed_packet = 32M
[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
[myisamchk]
key_buffer_size = 32M
sort_buffer_size = 32M
read_buffer = 8M
write_buffer = 8M
[mysqlhotcopy]
interactive-timeout
[mysqld_safe]
open-files-limit = 8196
#修改目录权限：
cd /usr/local/mysql/
chown -R mysql .
chgrp -R mysql .
初始化mysql：
/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --user=mysql --defaults-file=/etc/my.cnf
启动mysql：
/usr/local/mysql/bin/mysqld_safe --defaults-file=/etc/my.cnf --user=mysql&
登录：
/usr/local/mysql/bin/mysql -u root -p
/usr/local/mysql/bin/mysqladmin -u root -p shutdown
/usr/local/mysql/bin/mysqladmin --socket=/tmp/mysql1.sock -u root password xxx 修改密码
授权远程连接：
grant all privileges on *.* to root@"%" identified by 'xxx' with grant option;
flush privileges ;
第二个mysql：
#需要知道不同的配置文件，data文件和scoket文件名不同
tar -zxvf mysql-5.6.25.tar.gz
cd mysql-5.6.25
注意：
安装位置不能相同，这里指定为/usr/local/3307与前面的mysql区分开
cmake -DCMAKE_INSTALL_PREFIX=/usr/local/3307 -DEXTRA_CHARSETS=all -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DWITH_READLINE=1 -DWITH_SSL=system -DWITH_ZLIB=system -DWITH_EMBEDDED_SERVER=1 -DENABLED_LOCAL_INFILE=1
make && make install
cp support-files/my-default.cnf /usr/local/3307/my.cnf
vi /usr/local/3307/my.cnf
#加入优化的mysql配置：
###查看mysql innodb 5.5版本 show engine innodb status\G;
###注意:innodb 一定要在初始化之前加入配置文件
###5.6版本需要去掉#log_slow_queries=/usr/local/mysql/slow-log.log
###需要chmod 777 /tmp
[client]
#password = your_password
port = 3307 ##修改mysql的端口文件不要和以前那个重名
socket = /tmp/mysql1.sock ##修改mysql的socket文件不要和以前那个重名
# Here follows entries for some specific programs
# The MySQL server
[mysqld]
port = 3307 ##修改mysql的端口文件不要和以前那个重名
socket = /tmp/mysql1.sock ##修改mysql的socket文件不要和以前那个重名
skip-external-locking
max_allowed_packet = 32M
table_open_cache = 2048
net_buffer_length = 1M
character-set-server = utf8
skip-name-resolve
ft_min_word_len = 4
#### performance ####
open_files_limit = 10240
max_connections = 800
max_connect_errors = 6000
thread_stack = 192K
transaction_isolation = REPEATABLE-READ
tmp_table_size = 256M
max_heap_table_size = 256M
slow_query_log
long_query_time = 1
#log_slow_queries=/usr/local/mysql/slow-log.log
net_buffer_length = 1M
#### log ####
log-error=/usr/local/mysql/mysqld.err
back_log = 500
max_binlog_cache_size = 8M
max_binlog_size = 512M
binlog_format=mixed
expire_logs_days = 7
#### buffer && cache ####
read_buffer_size = 10M
read_rnd_buffer_size = 32M
sort_buffer_size = 2M
join_buffer_size = 2M
thread_cache_size = 300
thread_concurrency = 8
query_cache_size = 64M
query_cache_limit = 4M
binlog_cache_size = 4M
key_buffer_size = 32M
bulk_insert_buffer_size = 64M
#### myisam ####
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1
myisam_recover
log-bin=mysql-bin
server-id = 1
innodb_data_home_dir = /usr/local/mysql/data
innodb_data_file_path = ibdata1:10M:autoextend
innodb_log_group_home_dir = /usr/local/mysql/data
innodb_buffer_pool_size = 1G
innodb_additional_mem_pool_size = 16M
innodb_log_file_size = 150M
innodb_log_buffer_size = 16M
innodb_flush_log_at_trx_commit =2
innodb_lock_wait_timeout = 60
innodb_flush_method = O_DIRECT
innodb_open_files = 800
innodb_file_per_table=1
innodb_file_io_threads=4
[mysqldump]
quick
max_allowed_packet = 32M
[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
[myisamchk]
key_buffer_size = 32M
sort_buffer_size = 32M
read_buffer = 8M
write_buffer = 8M
[mysqlhotcopy]
interactive-timeout
[mysqld_safe]
open-files-limit = 8196
修改权限：
cd /usr/local/mysql/
chown -R mysql .
chgrp -R mysql .
初始化mysql：
/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/3307 --datadir=/usr/local/3307/data --user=mysql --defaults-file=/usr/local/3307/my.cnf
vi /usr/local/3307/my.cnf
重新加入mysql优化文件内容，初始化之后配置文件被重置
制定配置文件启动mysql：
/usr/local/mysql/bin/mysqld_safe --defaults-file=/usr/local/3307/my.cnf --user=mysql&
登录：
/usr/local/3307/bin/mysql --socket=/tmp/mysql1.sock （无密码）
/usr/local/3307/bin/mysqladmin --socket=/tmp/mysql1.sock -u root password xxxx（设置密码为xxxx）
/usr/local/3307/bin/mysql --socket=/tmp/mysql1.sock -u root -p （有密码登录）
/usr/local/3307/bin/mysqladmin --socket=/tmp/mysql1.sock -u root shutdown -p（关闭）
/usr/local/3307/bin/mysqld_safe --defaults-file=/usr/local/3307/my.cnf --user=mysql&
/usr/local/mysql/bin/mysqladmin --socket=/tmp/mysql1.sock -u root password xxx 修改密码
授权远程连接：
grant all privileges on *.* to root@"%" identified by 'xxxxx' with grant option;
flush privileges ;
附件下载：
http://down.51cto.com/data/2149472
本文转自 674591788 51CTO博客，原文链接:http://blog.51cto.com/mrdeng/1735245
