linux 安装mysql 5.7
1、下载tar包，这里使用wget从官网下载wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz
2、将mysql安装到/usr/local/mysql下
解压
tar -xvf mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz
移动
mv mysql-5.7.22-linux-glibc2.12-x86_64 /usr/local/
重命名
mv /usr/local/mysql-5.7.22-linux-glibc2.12-x86_64 /usr/local/mysql
3、新建data目录
mkdir /usr/local/mysql/data
4、新建mysql用户、mysql用户组
mysql用户组
groupadd mysql
mysql用户
useradd mysql -g mysql
5、将/usr/local/mysql的所有者及所属组改为mysql
chown -R mysql.mysql /usr/local/mysql
6、配置
/usr/local/mysql/bin/mysql_install_db --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data
如果出现以下错误：
2018-07-14 06:40:32 mysql_install_db is deprecated. Please consider switching to mysqld --initialize
2018-07-14 06:40:32 Child process: /usr/local/mysql/bin/mysqldterminated prematurely with errno= 32
2018-07-14 06:40:32 Failed to execute /usr/local/mysql/bin/mysqld --bootstrap -->datadir=/usr/local/mysql/data --lc-messages-dir=/usr/local/mysql/share --lc-messages=en_US -->basedir=/usr/local/mysql
-- server log begin --
-- server log end --
则使用以下命令：
/usr/local/mysql/bin/mysqld --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data --initialize
如果出现以下错误：
/usr/local/mysql/bin/mysqld: error while loading shared libraries: libnuma.so.1: cannot open shared object file: No such file or directory
则执行以下命令：
yum -y install numactl
完成后继续安装：
/usr/local/mysql/bin/mysqld --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data --initialize
编辑/etc/my.cnf
datadir=/usr/local/mysql/data
basedir=/usr/local/mysql
socket=/tmp/mysql.sock
user=mysql
port=3306
character-set-server=utf8
取消密码验证
skip-grant-tables
#Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
#skip-grant-tables
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
7、开启服务
将mysql加入服务
cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql
开机自启
chkconfig mysql on
开启
service mysql start
8、设置密码
登录（由于/etc/my.cnf中设置了取消密码验证，所以此处密码任意）
/usr/local/mysql/bin/mysql -u root -p
操作mysql数据库
>use mysql;
修改密码
>update user set authentication_string=password('你的密码') where user='root';
>flush privileges;
>exit;
9、将/etc/my.cnf中的skip-grant-tables删除
10、登录再次设置密码（不知道为啥如果不再次设置密码就操作不了数据库了）
/usr/local/mysql/bin/mysql -u root -p
>ALTER USER 'root'@'localhost' IDENTIFIED BY '修改后的密码';
>exit;
11、允许远程连接
/usr/local/mysql/bin/mysql -u root -p
>use mysql;
>update user set host='%' where user = 'root';
>flush privileges;
>eixt;
12、添加快捷方式
ln -s /usr/local/mysql/bin/mysql /usr/bin
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