Ubuntu22.04.4 - MySQL8

Ubuntu22.04.4 - MySQL8 - 笔记

MySQL8在Ubuntu22.04.4环境下的笔记

一、安装

sudo apt update
sudo apt install mysql-server
sudo systemctl status mysql

二、卸载

sudo apt remove --purge mysql-*
sudo apt autoremove
dpkg --list | grep mysql查询是否还存在相关的依赖组件
dpkg -l |grep ^rc|awk '{print $2}' |sudo xargs dpkg -P如果还存在一些依赖，则继续用“apt remove 依赖包名称”命令删除；确认删除完整后，清理残余文件
sudo rm -rf /etc/mysql
sudo rm -rf /var/lib/mysql

二、配置root密码

sudo cat /etc/mysql/debian.cnf[client]host     = localhostuser     = debian-sys-maintpassword = BT7UqYiANV3sePN2socket   = /var/run/mysqld/mysqld.sock[mysql_upgrade]host     = localhostuser     = debian-sys-maintpassword = BT7UqYiANV3sePN2socket   = /var/run/mysqld/mysqld.sock
mysql -u debian-sys-maint -p

修改root用户密码

mysql>  ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'zhengjun';

三、配置支持大小写

参考文献

https://askubuntu.com/questions/1261422/how-to-install-mysql-8-0-with-lower-case-table-names-1-on-ubuntu-server-20-04-lt

通过在安装后使用新值重新初始化 MySQL
一、安装 MySQL：sudo apt-get update    sudo apt-get install mysql-server -y
二、停止MySQL服务：sudo service mysql stop
三、删除MySQL数据目录：sudo rm -rf /var/lib/mysql
四、重新创建MySQL数据目录并配置权限：sudo mkdir /var/lib/mysql    sudo chown mysql:mysql /var/lib/mysqlsudo chmod 700 /var/lib/mysql
五、添加到中的部分 /etc/mysql/mysql.conf.d/mysqld.cnf
lower_case_table_names = 1
[mysqld]六、使用以下命令重新初始化 MySQL：sudo mysqld --defaults-file=/etc/mysql/my.cnf --initialize --lower_case_table_names=1 --user=mysql --console七、启动MySQL服务：sudo service mysql start
八、检索MySQL用户新生成的密码：rootsudo grep 'temporary password' /var/log/mysql/error.log
九、更改MySQL用户的密码：sudo mysql -u root -pALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPa$$w0rd';
十、验证设置：lower_case_table_namessudo mysql -u root -p执行：SHOW VARIABLES LIKE 'lower_case_%';预期输出：+------------------------+-------+| Variable_name          | Value |+------------------------+-------+| lower_case_file_system | OFF   || lower_case_table_names | 1     |+------------------------+-------+