centos7安装MySQL8

Centos7安装MySQL8

MySQL版本：8.0.34

1.安装前准备

（1）查看是否安装mariadb

$root@kb135 \~$ # rpm -qa|grep mariadb

（2）卸载mariadb并检查是否卸干净

$root@kb135 \~$ # rpm -e --nodeps mariadb-libs-5.5.68-1.el7.x86_64

2.安装mysql

（1）将安装包复制到/opt/software文件夹下

（2）解压文件至/usr/local目录下

$root@kb135 software$ # tar -xvf mysql-8.0.34-linux-glibc2.12-x86_64.tar.xz -C /usr/local/

（3）重命名

$root@kb135 local$ # mv mysql-8.0.34-linux-glibc2.12-x86_64/ mysql

（4）创建data文件夹

$root@kb135 local$ # mkdir mysql/data

（5）创建用户和用户组

创建用户组

$root@kb135 mysql$ # groupadd mysql

创建用户并指定用户组

$root@kb135 mysql$ # useradd -r -g mysql mysql

更改权限

$root@kb135 mysql$ # chmod -R 755 /usr/local/mysql/

（6）初始化MySQL

进入MySQL的bin目录

$root@kb135 mysql$ # cd /usr/local/mysql/bin/

初始化

$root@kb135 bin$ # ./mysqld --initialize --user=mysql --datadir=/usr/local/mysql/data --basedir=/usr/local/mysql

初始化完成后会得到一个随机密码

（7）配置参数文件

$root@kb135 bin$ # vim /etc/my.cnf

修改文件为以下内容

client

port = 3306

socket = /usr/local/mysql/data/mysql.sock

default-character-set = utf8mb4

mysql

default-character-set = utf8mb4

mysqld

character-set-client-handshake = FALSE

character-set-server = utf8mb4

collation-server = utf8mb4_general_ci

init_connect = 'SET NAMES utf8mb4'

port = 3306

socket = /usr/local/mysql/data/mysql.sock

skip-external-locking

key_buffer_size = 16M

max_allowed_packet = 1M

table_open_cache = 64

sort_buffer_size = 512K

net_buffer_length = 8K

read_buffer_size = 256K

read_rnd_buffer_size = 512K

myisam_sort_buffer_size = 8M

datadir = /usr/local/mysql/data

#lower_case_table_names=1

#如果要设置lower_case_table_names可以在初始化里面设置 ./mysqld --initialize --user=mysql --datadir=/usr/local/mysql/data --basedir=/usr/local/mysql --lower_case_table_names=1

mysqldump

quick

max_allowed_packet = 16M

mysql

no-auto-rehash

myisamchk

key_buffer_size = 20M

sort_buffer_size = 20M

read_buffer = 2M

write_buffer = 2M

mysqlhotcopy

interactive-timeout

修改文件权限为777

$root@kb135 bin$ # chmod 777 /etc/my.cnf

（8）启动MySQL

$root@kb135 bin$ # /usr/local/mysql/support-files/mysql.server start

（9）设置软连接，并重启MySQL

$root@kb135 bin$ # ln -s /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql

$root@kb135 bin$ # ln -s /usr/local/mysql/bin/mysql /usr/bin/mysql

$root@kb135 bin$ # ln -s /usr/local/mysql/mysql.sock /var/mysql.sock

$root@kb135 bin$ # service mysql restart

（10）登录并修改密码

$root@kb135 bin$ # mysql -uroot -p

输入之前的随机密码

修改密码

mysql> set password for root@localhost = '123456';

（11）开放远程连接

mysql> use mysql;

mysql> update user set user.Host='%' where user.User='root';

mysql> flush privileges;