可以更改的，确认下报错是什么，以及是否有将数据目录迁移过去，可以参考文档：
https://blog.csdn.net/y19910825/article/details/123414006

二进制模式安装mysql

Mysql5.7初始化前要评估是否独立的undo文件

tar -xvf mysql-5.7.34-linux-glibc2.12-x86_64.tar

mkdir -p /usr/local/mysql

mkdir -p /usr/local/mysql/data

groupadd mysql

useradd -r -g mysql mysql

chown -R mysql:mysql /usr/local/mysql

yum remove mariadb-libs-5.5.56-2.el7.x86_64

tar -zxvf mysql-5.7.34-linux-glibc2.12-x86_64.tar.gz -C /usr/local/mysql/

cd /usr/local/mysql/mysql-5.7.34-linux-glibc2.12-x86_64/

mv * ../

chown -R mysql:mysql /usr/local/mysql

[root@localhost support-files]# cp mysql.server /etc/init.d/mysqld

[root@localhost support-files]# pwd

/usr/local/mysql/support-files

chkconfig --add mysqld

chkconfig mysqld on

新建/etc/my.cnf，内容如下：

[mysqld]

port = 3306

socket = /usr/local/mysql/mysql.sock

user = mysql

basedir = /usr/local/mysql

datadir = /usr/local/mysql/data

pid-file = /usr/local/mysql/data/mysql.pid

#sql_mode='ONLY_FULL_GROUP_BY'

log_error = /usr/local/mysql/mysql-error.log

!includedir /etc/my.cnf.d

skip-grant-tables

mkdir /etc/my.cnf.d

mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data  --该初始化方式被不建议，应该使用如下方式：

mysqld --initialize-insecure --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data

5.6还是需要mysql_install_db初始化，5.7及有以上就建议mysqld初始化了

密码为空的初始化方式：

./mysqld --defaults-file=/usr/local/mysql/my.cnf --initialize-insecure

密码保存在错误日志中的初始化方式：

 /usr/local/mysql/bin/mysqld --defaults-file=/usr/local/mysql/my.cnf --initialize

安装后启动参考：

./bin/mysqld --defaults-file=/oradata/mysql8/my.cnf

mysql -uroot -h127.0.0.1

mysql> update user set Host='%' where user='root';

Query OK, 1 row affected (0.00 sec)

Rows matched: 1  Changed: 1  Warnings: 0

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

quit

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql> alter user 'root'@'%' identified by 'Mysql88!';

Query OK, 0 rows affected (0.00 sec