Linux CentOS7安装mysql-5.7.27

1.下载mysql-5.7.27-linux-glibc2.12-x86_64.tar.gz 上传到Linux服务器 /opt 目录下。

2.安装依赖 

yum install -y cmake make gcc gcc-c++ libaio ncurses ncurses-devel

3.解压文件 

tar -zxvf mysql-5.7.27-linux-glibc2.12-x86_64.tar.gz

4.将解压文件复制到/usr/local/mysql 目录 

cp -r mysql-5.7.27-linux-glibc2.12-x86_64   /usr/local/mysql

5.添加系统mysql组和mysql用户

创建组：

groupadd mysql

创建用户：

useradd -r -g mysql mysql 

（添加完成后可用id mysql查看）

6.切到mysql目录 

cd /usr/local/mysql

修改当前目录拥有者为mysql用户 

chown -R mysql:mysql ./

7.安装数据库

bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data

8.如果以下错误

bin/mysqld: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory

解决方法：

yum install -y libaio

  //安装后在初始化就OK了。

9.执行以下命令创建RSA private key

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

10.修改文件权限

修改当前目录拥有者为mysql用户 

chown -R mysql:mysql ./

修改当前data目录拥有者为mysql用户 

chown -R mysql:mysql data

11.配置my.cnf（一定要注意空格换行等特殊字符，会导致my.cnf 无法加载）

vim /etc/my.cnf

[mysqld]
character_set_server=utf8
init_connect='SET NAMES utf8'
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
socket=/tmp/mysql.sock
# 不区分大小写
lower_case_table_names = 1
# 不开启sql严格模式
sql_mode = "STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# Settings user and group are ignored when systemd is used.
# If you need to run mysqld under a different user or group,
# customize your systemd unit file for mariadb according to the
# instructions in http://fedoraproject.org/wiki/Systemd

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/usr/local/mysql/data/mysqld.pid

#
# include all files from the config directory
#
!includedir /etc/my.cnf.d

12.添加开机项

cp /usr/local/mysql/support-files/mysql.server  /etc/init.d/mysqld

vim /etc/init.d/mysqld

basedir=/usr/local/mysql
datadir=/usr/local/mysql/data

13.启动mysql

service mysqld start

加入开机启动

chkconfig --add mysqld

14.登录密码修改及远程连接

登录mysql

mysql -uroot -p

输入安装数据库的初始密码，如果忘记输入下面命令查询

cat /root/.mysql_secret

修改密码

## 修改密码
alter user 'root'@'localhost' identified by 'root';
## 刷新权限
FLUSH PRIVILEGES;
GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY 'some_pass' WITH GRANT OPTION;
## 开启远程登录
use mysql;
update user set host = '%' where user = 'root';
FLUSH PRIVILEGES;

 15.如果还是无法远程访问

关闭防火墙（CentOS 7.0默认使用的是firewall作为防火墙）

systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall开机启动