MySQL8.0降级安装5.7

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前言

基于OpenHarmony的FA数字管家服务端

默认情况下,Ubuntu20.04安装MySQL的版本为8.0。但8.0更加严格的加密规则,使得一些配置难以实现,故该项目中先进行MySQL 8.0.26 → MySQL 5.7.32

为什么不选择MySQL 5.7的最新版本 5.7.39呢?

我也不知道,反正我一开始降级为5.7.39的时候连mysql的server都跑不起来,所以选择了5.7.32

卸载MySQL 8.0.26

1. 查看MySQL的依赖项

dpkg --list|grep mysql

2. 卸载 mysql-common

sudo apt remove mysql-common

3. 卸载 mysql-server

sudo apt autoremove --purge mysql-server

4. 清除残留数据

dpkg -l|grep ^rc|awk '{print$2}'|sudo xargs dpkg -P

5. 再次查看MySQL的剩余依赖项(一般这时候就卸载干净了)

dpkg --list|grep mysql

6. 继续删除依赖项(如果步骤 5还有剩余依赖,则继续 6)

sudo apt autoremove --purge mysql-apt-config

安装MySQL 5.7.32

MySQL社区版官网:

1. 找到“DEB Bundle”

2.右击“download”

3.复制链接

终端

  1. 下载安装包wget +url
# 5.7.32版本为:
wget https://downloads.mysql.com/archives/get/p/23/file/mysql-server_5.7.32-1ubuntu18.04_amd64.deb-bundle.tar](https://downloads.mysql.com/archives/get/p/23/file/mysql-server_5.7.32-1ubuntu18.04_amd64.deb-bundle.tar 
  1. 找到下载安装包的路径解压压缩包

    tar +压缩包tar

# 5.7.32版本为:
tar -xvf mysql-server_5.7.32-1ubuntu18.04_amd64.deb-bundle.tar

  1. 更新依赖源及安装libaio1、libtinfo5依赖
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install libaio1
sudo apt-get install libtinfo5
  1. 按下列顺序安装
sudo dpkg -i mysql-common_5.7.32-1ubuntu18.04_amd64.deb
# 下一行代码会进入一个古老的界面,并让你输入密码,这个密码就是mysql的root密码
sudo dpkg-preconfigure mysql-community-server_5.7.32-1ubuntu18.04_amd64.deb 
sudo dpkg -i libmysqlclient20_5.7.32-1ubuntu18.04_amd64.deb
sudo dpkg -i libmysqlclient-dev_5.7.32-1ubuntu18.04_amd64.deb
sudo dpkg -i libmysqld-dev_5.7.32-1ubuntu18.04_amd64.deb
sudo dpkg -i mysql-community-client_5.7.32-1ubuntu18.04_amd64.deb
sudo dpkg -i mysql-client_5.7.32-1ubuntu18.04_amd64.deb
sudo dpkg -i mysql-common_5.7.32-1ubuntu18.04_amd64.deb
  1. 继续安装依赖
sudo apt-get -f install
sudo apt-get -f install libmecab2
  1. 安装mysql-server
sudo dpkg -i mysql-community-server_5.7.32-1ubuntu18.04_amd64.deb
sudo dpkg -i mysql-server_5.7.32-1ubuntu18.04_amd64.deb
  1. 检测安装
mysql -u root -p
# 然后会让输入密码,这个密码就是刚刚设置的密码

显示如下界面表示安装成功

![](https://tva1.sinaimg.cn/large/e6c9d24egy1h0e503ppxnj20vk0amjt0.jpg)

配置MySQL 5.7.32

1. 初始化配置

sudo mysql_secure_installation

2. 配置说明

# 1  选择N,不会进行密码的强校验;Y 进行
VALIDATE PASSWORD PLUGIN can be used to test passwords...
Press y|Y for Yes, any other key for No:

# 2 数据库的root密码,该密码会把上面设置过的root密码覆盖
Please set the password for root here...
New password: # (输入密码)
Re-enter new password: # (重复输入)

# 3  选择N,不删除匿名用户;Y 删除
By default, a MySQL installation has an anonymous user allowing anyone to log into MySQL without having to have a user account created for them...
Remove anonymous users? (Press y|Y for Yes, any other key for No) :

# 4  选择N,允许root远程连接;Y 不允许
Normally, root should only be allowed to connect from,'localhost'. This ensures that someone cannot guess at the root password from the network...
Disallow root login remotely? (Press y|Y for Yes, any other key for No) :
# 5 选择N,不删除test数据库;Y 删除
By default, MySQL comes with a database named 'test' that anyone can access...
Remove test database and access to it? (Press y|Y for Yes, any other key for No) : 

# 6  选择Y,修改权限立即生效;N 待会生效
Reloading the privilege tables will ensure that all changes made so far will take effect immediately.
Reload privilege tables now? (Press y|Y for Yes, any other key for No) :

3. 检查mysql服务状态

systemctl status mysql.service

MySQL8.0降级安装5.7_第1张图片

WelCome!

原帖:wolai

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