虚拟机Centos7.6安装Mysql8

由于本人贫穷，没钱搞服务器，就在虚拟机上安装了一个centos7.6服务器，然后今天给大家带来的是在centos7.6安装mysql8的教程。

如果你也跟我一样贫穷，可以根据下面这篇教程来在虚拟机上安装centos7.6系统：

https://zhuanlan.zhihu.com/p/698840895

安装完成后，用xshell等工具连上虚拟机服务器，开始执行命令安装。

查看mariadb安装情况

rpm -qa|grep mariadb

如果安装了，然后用 rpm 移除它，如果没有则无需移除。

rpm -e --nodeps mariadb-libs-5.5.60-1.el7_5.x86_64

安装libaio

yum -y install libaio

如果提示下面 “Cannot find a valid baseurl for repo: base/7/x86_64”

则需要设置镜像源

rm -f /etc/yum.repos.d/*
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum clean all

然后在执行安装

yum -y install libaio

继续安装numactl

yum -y install numactl

下载mysql包

wget https://downloads.mysql.com/archives/get/p/23/file/mysql-8.0.30-el7-x86_64.tar

这里本人测试下载的很慢，你可以直接到windows上用迅雷下载好，然后用 xftp上传到linux上。文件就存在/usr/local下面

解压压缩包

cd /usr/local/

tar -xvf mysql-8.0.30-el7-x86_64.tar

tar -zxvf mysql-8.0.30-el7-x86_64.tar.gz

重命名

mv mysql-8.0.30-el7-x86_64/ mysql

创建数据目录

mkdir mysql/data

设置权限用户

groupadd mysql

useradd -r -g mysql mysql

chown -R mysql:mysql /usr/local/mysql/

chmod -R 755 /usr/local/mysql/

初始化mysql

cd /usr/local/mysql/bin/

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

初始化时，给了你一个密码，你要记住，后面要用到。

my.cnf 配置文件修改

vim /etc/my.cnf

--------内容可以自己填自己的-----------

[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

修改配置文件的权限

chmod 777 /etc/my.cnf

启动mysql

/usr/local/mysql/support-files/mysql.server start

建立软链接并且重启

ln -s /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql
ln -s /usr/local/mysql/bin/mysql /usr/bin/mysql
ln -s /usr/local/mysql/mysql.sock /var/mysql.sock
service mysql restart

登录并更改密码

mysql -uroot -p

提示要你输入密码，密码就是上面初始化时给的。

登录进去后，输入下面改密码为123456

alter user 'root'@'localhost' identified by '123456';