Linux下MySQL5.7.19

第一次在自己虚机上安装mysql 中间碰到很多问题在这里记下来，分享一下。

linux centOS 6

mysql版本 mysql-5.7.19-linux-glibc2.12-x86_64.tar.gz

1、groupadd mysql ## 添加一个mysql组

2、useradd -r -g mysql mysql ## 添加一个用户

3、解压缩下载的包，tar -xzvf /usr/local/mysql-5.7.13-linux-glibc2.5-x86_64.tar.gz

4、mv /usr/local/mysql-5.7.13-linux-glibc2.5-x86_64 /usr/local/mysql ##重命名

解压后目录：

5、mkdir /usr/local/mysql/data ## 默认是没有这个文件夹得用来放数据

6、chown -R mysql:mysql ./ ##进入mysql包中，给这个包授权给mysql

7、chgrp -R mysql:mysql ./ ##进入mysql包中

8、bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data ##进入mysql文件名 basedir 为mysql 的路径， datadir 为mysql的 data 包，里面存放着mysql自己的包，如user

　网上很多教程mysql_install_db 方式安装的，我刚开始也是这么安装，各种报错、失败，mysql_install_db 命令不推荐、按上面的命令来就好

此处需要注意记录生成的临时密码，如上文：YLi>7ecpe;YP

9、bin/mysql_ssl_rsa_setup --datadir=/usr/local/mysql/data

10、进入mysql support-files

11、cp my-default.cnf /etc/my.cnf

　　发现这个版本就没有my-default

　　这个是时候我们自己创建一个(内部代码如图)：重点下面两个socket（红色）对应的值必须一致，不然启动以后链接不上

#dvice 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]



sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES 

# 一般配置选项
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
port = 3306
#socket = /temp/mysqld.sock
socket = /var/run/mysqld/mysqld.sock
character-set-server=utf8


#下面是可选项，要不要都行，如果出现启动错误，则全部注释掉，保留最基本的配置选项，然后尝试添加某些配置项后启动，检测配置项是否有误
back_log = 300
max_connections = 3000
max_connect_errors = 50
table_open_cache = 4096
max_allowed_packet = 32M
#binlog_cache_size = 4M

max_heap_table_size = 128M
read_rnd_buffer_size = 16M
sort_buffer_size = 16M
join_buffer_size = 16M
thread_cache_size = 16
query_cache_size = 128M
query_cache_limit = 4M
ft_min_word_len = 8

thread_stack = 512K
transaction_isolation = REPEATABLE-READ
tmp_table_size = 128M
#log-bin=mysql-bin
long_query_time = 6


server_id=1

innodb_buffer_pool_size = 1G
innodb_thread_concurrency = 16
innodb_log_buffer_size = 16M


innodb_log_file_size = 512M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120
innodb_file_per_table = on

[mysqldump]
quick

max_allowed_packet = 32M

[mysql]
no-auto-rehash
socket = /var/run/mysqld/mysqld.sock
default-character-set=utf8
safe-updates


[myisamchk]
key_buffer = 16M
sort_buffer_size = 16M
read_buffer = 8M
write_buffer = 8M

[mysqlhotcopy]
interactive-timeout

[mysqld_safe]
open-files-limit = 8192

[client]
loose-default-character-set = utf8

12、cp mysql.server /etc/init.d/mysql

13、vim /etc/init.d/mysql ##修改basedir= 自己的路径修改datadir= 自己的路径

14、bin/mysqld_safe --user=mysql & ## 启动mysql

13、./mysql -uroot -p ##bin目录下

14、输入临时密码

15、修改MySQL的root密码