centos下彻底删除MYSQL 和重新安装MYSQL的解压缩版

太过爱你忘了你带给我的痛 2022-06-16 02:16 236阅读 0赞

# centos下彻底删除MYSQL 和重新安装MYSQL #

#  删除Mysql #

yum remove  mysql mysql-server mysql-libs mysql-server;  
  
    find / -name mysql 将找到的相关东西delete掉；  
  
    rpm -qa|grep mysql(查询出来的东东yum remove掉)

# 安装Mysql #

# 1、下载安装包 #

去官网下载mysql的tar.gz的文件

# 2.检查库文件是否存在，如有删除。 #

\[root@localhost ~\]\# rpm -qa | grep mysql

# 3.检查mysql组和用户是否存在，如无创建。 #

\[root@localhost mysql\]\# rpm -qa | grep mysql  
\[root@localhost mysql\]\# cat /etc/group | grep mysql  
mysql:x:1001:  
\[root@localhost etc\]\# cat /etc/passwd | grep mysql  
mysql:x:991:1001::/home/mysql:/bin/bash  
  
若没有就创建  
\[root@localhost mysql\]\# groupadd mysql          \#创建一个mysql组  
\[root@localhost mysql\]\# useradd -r -g mysql mysql     \#往组里面添加一个用户,  
\-r表示mysql是系统用户,不可用于登陆系统,-g表示组 mysql 第二个mysql表示用户；

# 4.解压tar.gz包，更改所属的组和用户 #

我的 mysql-5.7.10-linux-glibc2.5-x86\_64.tar.gz 文件是放在下面这个目录下面的  
\[root@localhost mysql\]\# pwd  
/home/software/mysql  
\[root@localhost mysql\]\# tar -zxvf mysql-5.7.10-linux-glibc2.5-x86\_64.tar.gz  
mysql-5.7.10-linux-glibc2.5-x86\_64/  
mysql-5.7.10-linux-glibc2.5-x86\_64/include/  
mysql-5.7.10-linux-glibc2.5-x86\_64/include/my\_dir.h  
mysql-5.7.10-linux-glibc2.5-x86\_64/include/mysql.h  
mysql-5.7.10-linux-glibc2.5-x86\_64/include/my\_byteorder.h  
mysql-5.7.10-linux-glibc2.5-x86\_64/include/my\_list.h  
...  
...  
mysql-5.7.10-linux-glibc2.5-x86\_64/man/man1/mysqlshow.1  
mysql-5.7.10-linux-glibc2.5-x86\_64/man/man1/zlib\_decompress.1  
mysql-5.7.10-linux-glibc2.5-x86\_64/man/man1/mysql\_install\_db.1  
  
\[root@localhost mysql\]\# mv mysql-5.7.10-linux-glibc2.5-x86\_64 mysql5.7  
\[root@localhost mysql\]\# ls -l  
total 535920  
drwxr-xr-x. 9 7161 wheel      4096 Nov 30  2015 mysql5.7  
\-rwxrwxrwx. 1 root root  548774698 Dec 24  2015 mysql-5.7.10-linux-glibc2.5-x86\_64.tar.gz  
\# 将 mysql5.7/ 目录包含所有的子目录和文件，所有者改变为mysql,所属组改变为mysql  
\[root@localhost mysql\]\# chown -R mysql mysql5.7/  
\[root@localhost mysql\]\# chgrp -R mysql mysql5.7/  
\[root@localhost mysql\]\# ls -l  
total 535920  
drwxr-xr-x. 9 mysql mysql      4096 Nov 30  2015 mysql5.7  
\-rwxrwxrwx. 1 root  root  548774698 Dec 24  2015 mysql-5.7.10-linux-glibc2.5-x86\_64.tar.gz  
\[root@localhost mysql\]\# cd mysql5.7/

# 5.安装和初始化数据库 #

\[root@localhost mysql5.7\]\# bin/mysql\_install\_db --user=mysql --basedir=/home/software/mysql/mysql5.7/ --datadir=/home/software/mysql/mysql5.7/data/  
2017-05-02 22:04:13 \[WARNING\] mysql\_install\_db is deprecated. Please consider switching to mysqld --initialize  
2017-05-02 22:04:17 \[WARNING\] The bootstrap log isn't empty:  
2017-05-02 22:04:17 \[WARNING\] 2017-05-02T14:04:13.971980Z 0 \[Warning\] --bootstrap is deprecated. Please consider using --initialize instead  
  
\[root@localhost mysql5.7\]\# cp -a ./support-files/my-default.cnf  /etc/my.cnf  
\[root@localhost mysql5.7\]\# cp -a ./support-files//mysql.server /etc/init.d/mysqld  
\[root@localhost mysql5.7\]\# cd bin  
\[root@localhost bin\]\# ./mysqld\_safe --user=mysql&  
\[1\] 4687  
\[root@localhost bin\]\# ./mysqld\_safe: line 522: /usr/local/mysql/data/mysqld\_safe.pid: No such file or directory  
awk: (FILENAME=- FNR=1) warning: error writing standard output (Broken pipe)  
170502 22:07:37 mysqld\_safe Logging to '/usr/local/mysql/data/localhost.localdomain.err'.  
touch: cannot touch ‘/usr/local/mysql/data/localhost.localdomain.err’: No such file or directory  
chmod: cannot access ‘/usr/local/mysql/data/localhost.localdomain.err’: No such file or directory  
touch: cannot touch ‘/usr/local/mysql/data/localhost.localdomain.err’: No such file or directory  
chown: cannot access ‘/usr/local/mysql/data/localhost.localdomain.err’: No such file or directory  
170502 22:07:37 mysqld\_safe The file /usr/local/mysql/bin/mysqld  
does not exist or is not executable. Please cd to the mysql installation  
directory and restart this script from there as follows:  
./bin/mysqld\_safe&  
See http://dev.mysql.com/doc/mysql/en/mysqld-safe.html for more information  
./mysqld\_safe: line 130: /usr/local/mysql/data/localhost.localdomain.err: No such file or directory  
^C  
\[1\]+  Exit 1                  ./mysqld\_safe --user=mysql  
  
 \# 执行上面命令时报错：是因为我使用的是默认的配置文件默认的路径，而我的安装目录不是在默认路径/usr/local/mysql下，所以还要执行下面的命令：  
  
\[root@localhost etc\]\# less my.cnf  
\[root@localhost etc\]\# vi my.cnf  
\[root@localhost etc\]\# vi init.d/mysqld  
\[root@localhost etc\]\# mkdir -p /usr/local/mysql/bin  
\[root@localhost etc\]\# ln -s /home/software/mysql/mysql5.7/bin/mysqld /usr/local/mysql/bin/mysqld  
\[root@localhost bin\]\# ./mysqld\_safe --user=mysql&  
\[1\] 4904  
\[root@localhost bin\]\# 170502 22:14:42 mysqld\_safe Logging to '/home/software/mysql/mysql5.7/data/localhost.localdomain.err'.  
170502 22:14:42 mysqld\_safe Starting mysqld daemon with databases from /home/software/mysql/mysql5.7/data  
\[root@localhost bin\]\# /etc/init.d/mysqld restart  
Shutting down MySQL..170502 22:15:53 mysqld\_safe mysqld from pid file /home/software/mysql/mysql5.7/data/localhost.localdomain.pid ended  
 SUCCESS!  
Starting MySQL. SUCCESS!  
\[1\]+  Done                    ./mysqld\_safe --user=mysql  
\# 把mysql设置为开机启动，启动层次是图形界面和命令行模式  
\[root@localhost bin\]\# chkconfig --level 35 mysqld on

# 6.初始化密码 #

mysql5.7会生成一个初始化密码，而在之前的版本首次登陆不需要登录。  
  
  
\[root@localhost bin\]\# cat /root/.mysql\_secret  
\# Password set for user 'root@localhost' at 2017-05-02 22:04:13  
rG>oDYxpsA4u  
\[root@localhost bin\]\# ./mysql -uroot -p  
Enter password:  
Welcome to the MySQL monitor.  Commands end with ; or \\g.  
Your MySQL connection id is 2  
Server version: 5.7.10  
  
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.  
  
Oracle is a registered trademark of Oracle Corporation and/or its  
affiliates. Other names may be trademarks of their respective  
owners.  
  
Type 'help;' or '\\h' for help. Type '\\c' to clear the current input statement.  
  
mysql> show databases；  
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.  
\# 会提示你去重新设置密码才能执行这个语句  
\# 重新设置密码  
mysql> SET PASSWORD = PASSWORD('root');  
Query OK, 0 rows affected, 1 warning (0.01 sec)  
\# 刷新权限  
mysql> flush privileges;  
Query OK, 0 rows affected (0.00 sec)

# 7.添加远程访问权限 #

mysql> show databases;  
\+--------------------+  
| Database           |  
\+--------------------+  
| information\_schema |  
| mysql              |  
| performance\_schema |  
| sys                |  
\+--------------------+  
4 rows in set (0.00 sec)  
  
mysql> use mysql  
Reading table information for completion of table and column names  
You can turn off this feature to get a quicker startup with -A  
mysql> select host, user from user;  
\+-----------+-----------+  
| host      | user      |  
\+-----------+-----------+  
| localhost | mysql.sys |  
| localhost | root      |  
\+-----------+-----------+  
2 rows in set (0.00 sec)  
  
mysql> update set host = '%' where user = 'root';  
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'set host = '%' where user = 'root'' at line 1  
mysql> update set user host = '%' where user = 'root';  
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'set user host = '%' where user = 'root'' at line 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> select host, user from user;  
\+-----------+-----------+  
| host      | user      |  
\+-----------+-----------+  
| %         | root      |  
| localhost | mysql.sys |  
\+-----------+-----------+  
2 rows in set (0.00 sec)  
  
mysql> /etc/init.d/mysqld restart  
    -> ;  
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '/etc/init.d/mysqld restart' at line 1  
mysql> exit  
Bye  
\[root@localhost bin\]\# /etc/init.d/mysqld restart  
Shutting down MySQL.. SUCCESS!  
Starting MySQL. SUCCESS!