#此方式是給root用戶設(shè)置臨時(shí)密碼，但應(yīng)用臨時(shí)密碼登錄數(shù)據(jù)庫(kù)服務(wù)后，需要將臨時(shí)密碼修改，否則不能進(jìn)行任何操作
mysqld --initialize  --user=mysql --datadir=/data/3306/data --basedir=/usr/local/mysql
# 參數(shù)解析
# --user：指定Linux系統(tǒng)用戶
# --datadir：指定數(shù)據(jù)目錄
# --basedir：指定按照目錄

mysqladmin -uroot password '新密碼';
#或者   此方法需要登錄到MySQL系統(tǒng)中
alter user root@'localhost' identified by '新密碼';

mysqladmin -uroot password '新密碼';
#或者   此方法需要登錄到MySQL系統(tǒng)中
alter user root@'localhost' identified by '新密碼';

set password for 'oldboy'@'localhost'=PASSWORD('新密碼');
flush privileges;

mysqladmin -uroot -p老密碼 password '新密碼'
#或者登錄進(jìn)數(shù)據(jù)庫(kù)中執(zhí)行
alter mysql.user root@'localhost' identified by '新密碼';

# 需登錄進(jìn)數(shù)據(jù)庫(kù)中
update mysql.user set authentication_string=PASSWORD('新密碼') where user='root' and host='localhost';
flush privileges; 

# 需登錄進(jìn)數(shù)據(jù)庫(kù)中
set password for 'root'@'localhost'=PASSWORD('新密碼');
flush privileges;

[root@master ~]# /etc/init.d/mysqld stop
# 檢查是否已關(guān)閉
[root@master ~]# ps -ef | grep mysqld
root     4070896 4068830  0 15:24 pts/0    00:00:00 grep mysqld

# 輸入mysqld_safe --skip-grant-tables --skip-networking & 即可
[root@master ~]# mysqld_safe --skip-grant-tables --skip-networking &
[1] 4071155
[root@master ~]# 2025-10-28T07:25:16.184768Z mysqld_safe Logging to '/var/log/mysql/error.log'.
2025-10-28T07:25:16.211299Z mysqld_safe Starting mysqld daemon with databases from /data00/data/mysql

[root@master ~]# 2025-10-28T07:25:16.184768Z mysqld_safe Logging to '/var/log/mysql/error.log'.
2025-10-28T07:25:16.211299Z mysqld_safe Starting mysqld daemon with databases from /data00/data/mysql
# 輸入mysql -uroot 即可
mysql -uroot
# 修改密碼
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
mysql> alter user root@'localhost' identified by 'huangsir';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
# 退出數(shù)據(jù)庫(kù)
mysql> exit;

# 先殺掉進(jìn)程
[root@master ~]# pkill mysql
# 檢查進(jìn)程是否殺掉
[root@master ~]# ps -ef | grep mysql
root     4072026 4068830  0 15:29 pts/0    00:00:00 grep mysql
# 啟動(dòng)mysql
[root@master ~]# /etc/init.d/mysqld start
Starting mysqld (via systemctl): mysqld.service.

[root@master ~]# mysql -uroot -phuangsir
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.26 MySQL Community Server - GPL
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>