centos7如何安装mysql5.7在前面一篇博客上已经记录了过程，整个过程编译下来几乎花了个吧小时。到92%的时候居然息屏注销了，虚拟机直接中断。中断了。。但是好消息是居然可以继续编译，然后编译完了，报了两个错。。。不过没啥事，不影响。

当我希望跑多个实例时，看到网上有人说，重新编译，然后prefix指定其他的安装路径，我的内心是崩溃的。这tm又几个小时？肯定不会那么傻。

遇到了不少坑，开始吧！！

当我们make install之后，这就是我们的安装目录

我们拷贝这个目录命名mysql-5.7.16_1(因为mysql的默认端口是3306)，

将mysql的配置文件拷贝到目录下：

cp /opt/mysql-5.7.16_1/support-files/my-default.cnf /opt/mysql-5.7.16_1/my.cnf

[root@localhost opt]# vim mysql-5.7.16_1/my.cnf

# For advice on how to change settings please see

# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html

# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the

# *** default location during install, and will be replaced if you

# *** upgrade to a newer version of MySQL.

[mysqld]

# Remove leading # and set to the amount of RAM for the most important data

# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.

# innodb_buffer_pool_size = 128M

# Remove leading # to turn on a very important data integrity option: logging

# changes to the binary log between backups.

# log_bin

# These are commonly set, remove the # and set as required.

basedir = /opt/mysql-5.7.16_1/

datadir = /data/mysql3307/

port = 3307

# server_id = .....

##################多实例别忘了修改下面配置项#########################

socket = /tmp/mysql3307.sock

################################################

# Remove leading # to set options mainly useful for reporting servers.

# The server defaults are faster for transactions and fast SELECTs.

# Adjust sizes as needed, experiment to find the optimal values.

# join_buffer_size = 128M

# sort_buffer_size = 2M

# read_rnd_buffer_size = 2M

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

初始化数据库

/opt/mysql-5.7.16_1/bin/mysqld --initialize --user=mysql --basedir=/opt/mysql-5.7.16_1 --datadir=/data/mysqldata3307

改端口，改数据存储目录，改安装目录貌似就没啥事了。

bin/mysqld_safe --defaults-file=/opt/mysql-5.7.16_1/my.cnf & (&表示后台守护进程方式执行)

连接 报错！！

[root@localhost mysql-5.7.16_1]# 2016-11-29T03:43:16.930189Z mysqld_safe Logging to '/data/mysqldata3307//localhost.localdomain.err'.

2016-11-29T03:43:17.173713Z mysqld_safe Starting mysqld daemon with databases from /data/mysqldata3307/

[root@localhost mysql-5.7.16_1]# bin/mysql -u root -p

Enter password:

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

/tmp/mysql.sock是什么东西，一直这里报错。于是各种初始化数据库搞来搞去。过程是痛苦的。

终于找到了答案。其实最初的运行是成功的，不过我们没有找到本地访问它的方法

关键的来了

bin/mysql -u root -p -S /tmp/mysql3307.sock

mysql本地连接默认使用mysql.sock ，所以上面启动每次都

Can't connect to local MySQL server through socket '/tmp/mysql.sock'

-S /tmp/mysql3307.sock

指定使用此socket，这个是my.ini中刚刚我们所做的配置项。

通过这样指定 ，使用初始化数据库时产生的初始密码。

nice，进去了，然后修改密码，远程就可以访问了。

登陆修改root密码

# /opt/mysql-5.7.16/bin/mysql -uroot -p(连接mysql，输入初始化时生成的随机密码)

mysql>alter user 'root'@'localhost' identified by 'SHUNyou!#2017';

8、修改MySQL的root用户密码和授权用户管理某个数据库

mysql> grant all on db_fuyuan.* to dev_shunyou@'%' identified by 'dev_shunyou!@#2016';(新建用户账号和密码并授权用户来管理某个数据库)

mysql> flush privileges;

mysql> exit

mysql> \s (查看服务器状态)