linux上安装mysql5.7

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：

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2018-07-14 06:40:32 [WARNING] mysql_install_db is deprecated. Please consider switching to mysqld --initialize
2018-07-14 06:40:32 [ERROR]   Child process: /usr/local/mysql/bin/mysqldterminated prematurely with errno= 32
2018-07-14 06:40:32 [ERROR]   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 --

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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

或者

yum install -y libaio

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

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[mysqld]
datadir=/usr/local/mysql/data
basedir=/usr/local/mysql
socket=/tmp/mysql.sock
user=mysql
port=3306
character-set-server=utf8
# 忽略表名大小写
lower_case_table_names=1
# 取消密码验证
skip-grant-tables

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

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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

mysql>use mysql;

修改密码

mysql>update user set authentication_string=password('你的密码') where user='root';
mysql>flush privileges;
mysql>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

mysql>ALTER USER 'root'@'localhost' IDENTIFIED BY '修改后的密码';
mysql>exit;

11、允许远程连接

/usr/local/mysql/bin/mysql -u root -p

mysql>use mysql;
mysql>update user set host='%' where user = 'root';
mysql>flush privileges;
mysql>exit;

12、添加快捷方式

ln -s /usr/local/mysql/bin/mysql /usr/bin

ln -s /usr/local/mysql/bin/mysqldump /usr/bin(一般用于数据库备份或还原)