1.徹底刪除已安裝mysql
1) yum remove mysql mysql-server mysql-libs mysql-server;
刪除雲服務
2) find / -name mysql
查找服務器上有什麼跟mysql相關的,刪除它
rm -rf /var/lib/mysql
3) rpm -qa|grep mysql
(查詢出來的東東yum remove掉)
4) rm /etc/my.cnf
參考鏈接:https://www.cnblogs.com/cyl048/p/6879085.html
2.重新安裝mysql
1) wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
# 下載mysql源安裝包
2)yum localinstall mysql57-community-release-el7-8.noarch.rpm
# 安裝mysql源
3)yum repolist enabled | grep "mysql.*-community.*"
#檢查mysql源是否安裝成功
4)yum install mysql-community-server
安裝MySQL
5)systemctl start mysqld
配置文件:/etc/my.cnf
日誌文件:/var/log/mysqld.log
服務啓動腳本:/usr/lib/systemd/system/mysqld.service
socket文件:/var/run/mysqld/mysqld.pid
參考鏈接:https://www.cnblogs.com/duguxiaobiao/p/9465702.html
3.重置mysql鏈接密碼
1)#vim /etc/my.cnf
在[mysqld]後面任意一行添加“skip-grant-tables”
2) service mysqld start(可能要先關閉,再重啓)
重啓mysql。此時說明無需要密碼
3)sql來修改root
mysql> use mysql;
mysql> update user set authentication_string=password("你的新密碼") where user="root";
mysql> flush privileges;
mysql> quit
4)刪除1)
4. 查看是否支持鏈接
如IP爲172.0.0.1,密碼爲a123456
mysql -h 172.0.0.1 -P 3306 -u root -pa123456
(特別注意:-p + 密碼,而且不能有空格)
https://blog.csdn.net/dabao87/article/details/80571877
如有需要:update user set Host='%' where User='root';