CentOS7下绿色安装MySQL8

1. 官网下载社区版，.tar.xz文件（传送）
2. 卸载MariaDB，centos7中使用yum install,默认安装的是此数据库，此数据库完全兼容mysql。

ps -ef | grep maria*, ps -ef | grep mysql, yum remove xxx

3. tar解压tar.xz文件到你喜欢的目录

tar -xvf mysql-8.0.19-linux-glibc2.12-x86_64.tar.xz

4. 自己在/etc目录下新建my.cnf，例如：

# MySQL 配置文件，

# 数据库目录 /home/local/mysql-8.0.19-linux-glibc2.12-x86_64/data
[client]
port=33689
# mysql socket 文件存放地址 
socket=/tmp/mysql.sock
# 默认字符集
default-character-set=utf8

[mysqld]
server-id=1
# 端口
port=33689
# 运行用户
user=mysql
# 最大连接
max_connections=200
socket=/tmp/mysql.sock
# mysql 安装目录（解压后文件的目录）
basedir=/home/local/mysql-8.0.19-linux-glibc2.12-x86_64
# 数据目录（这里放在我们新建的 /data/mysql 下）
datadir=/home/local/mysql-8.0.19-linux-glibc2.12-x86_64/data
pid-file=/home/local/mysql-8.0.19-linux-glibc2.12-x86_64/data/mysql.pid
init-connect='SET NAMES utf8'
character-set-server=utf8
# 数据库引擎
default-storage-engine=INNODB
log_error=/home/local/mysql-8.0.19-linux-glibc2.12-x86_64/data/mysql-error.log
slow_query_log_file=/home/local/mysql-8.0.19-linux-glibc2.12-x86_64/data/mysql-slow.log
transaction_isolation=READ-COMMITTED
default-authentication-plugin=mysql_native_password
# 跳过验证密码
#skip-grant-tables

[mysqldump]
quick
#max_allowed_packet=16M
EOF

5. 添加linux添加mysql用户并授权目录访问权限

groupadd mysql
useradd -g mysql mysql
chown -R mysql:mysql chown -R /home/local/mysql-8.0.19-linux-glibc2.12-x86_64/data
chown -R mysql:mysql /home/local/mysql-8.0.19-linux-glibc2.12-x86_64/data
chown -R mysql:mysql /home/local/mysql-8.0.19-linux-glibc2.12-x86_64
chown -R 755 /home/local/mysql-8.0.19-linux-glibc2.12-x86_64
chown -R 755 /home/local/mysql-8.0.19-linux-glibc2.12-x86_64/data/

6. 初始化mysql数据库，期间可能需要你安装对应的依赖库

yum install libaio*
./bin/mysqld --initialize --user=mysql

7. 找到默认的root密码并修改

# 先启动
/support-files/mysql.server start
vi  /home/local/mysql-8.0.19-linux-glibc2.12-x86_64/datadata/mysql-error.log 

image.png

./bin/mysql -uroot -p
CREATE USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'password';
./support-files/mysql.server stop
./support-files/mysql.server start

8. mysql8默认caching_sha2_password设置是另一个问题
   https://dev.mysql.com/doc/refman/8.0/en/caching-sha2-pluggable-authentication.html