Centos7 安装/卸载mysql 5.7

Centos7 安装/卸载mysql 5.7

目录：

   1.安装

   2.卸载

1.安装:

注: 卸载MariaDB

[root@cluster03 logs]# rpm -qa | grep mariadb
mariadb-libs-5.5.64-1.el7.x86_64
[root@cluster03 logs]# rpm -e --nodeps mariadb-libs-5.5.64-1.el7.x86_64

step1:下载mysql源安装包：

wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm

step2:安装mysql源：

yum localinstall mysql57-community-release-el7-8.noarch.rpm

• 执行完成后会在/etc/yum.repos.d/目录下生成两个repo文件
  • mysql-community.repo
  • mysql-community-source.repo

[root@cluster02 yum.repos.d]#yum localinstall mysql57-community-release-el7-8.noarch.rpm
[root@cluster02 installPage]# cd /etc/yum.repos.d/
[root@cluster02 yum.repos.d]# ll
total 16
-rw-r--r-- 1 root root  675 Mar  1 21:37 CentOS-Base.repo
-rw-r--r-- 1 root root  230 Mar  1 21:37 epel.repo
-rw-r--r-- 1 root root 1222 Mar 23  2016 mysql-community.repo
-rw-r--r-- 1 root root 1236 Mar 23  2016 mysql-community-source.repo

step3:检测是否安装完成:

yum repolist enabled | grep "mysql.*-community.*"

step4:安装mysql:

yum install mysql-community-server

step5:启动mysql服务：

systemctl restart mysqld

step6:查看mysql初始密码：

• 如果过去不到临时密码:
• rm -rf /var/lib/mysql 删除原来安装过的mysql残留的数据
• systemctl start mysqld 重启
• 重新获取

grep 'A temporary password' /var/log/mysqld.log

step7:登录：

mysqladmin -u root -p'获取的密码'

step8:更改mysql密码： 报错

• 原因:密码设置时必须包含大小写字母、特殊符号、数字，并且长度大于8位

mysql> set password = '123456' ;
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+-------+
| Variable_name                        | Value |
+--------------------------------------+-------+
| validate_password_check_user_name    | OFF   |
| validate_password_dictionary_file    |       |
| validate_password_length             | 8     |
| validate_password_mixed_case_count   | 1     |
| validate_password_number_count       | 1     |
| validate_password_policy             | MEDIUM|
| validate_password_special_char_count | 1     |
+--------------------------------------+-------+
7 rows in set (0.03 sec)

step9:修改密码强度校验等级

• set global validate_password_policy=LOW;

mysql> set global validate_password_policy=LOW;
Query OK, 0 rows affected (0.00 sec)

mysql> set password='123456';
Query OK, 0 rows affected (0.00 sec)

step10:开启远程登录，授权root远程登录

• GRANT ALL PRIVILEGES ON . TO ‘root’@’%’ IDENTIFIED BY ‘远程登录免密’ WITH GRANT OPTION;

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '密码' WITH GRANT OPTION;
Query OK, 0 rows affected, 1 warning (0.00 sec)

step11:命令立即执行生效

• flush privileges;

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

step12:设置开启启动mysql服务:

• systemctl enable mysqld    开机自启
• systemctl disable mysqld    取消开机自启

[root@cluster01 yum.repos.d]# systemctl enable mysqld

2.卸载

step1: 查看mysql 安装

• rpm -qa|grep -i mysql

[root@cluster01 yum.repos.d]# rpm -qa|grep -i mysql
mysql-community-common-5.7.29-1.el7.x86_64
mysql-community-client-5.7.29-1.el7.x86_64
mysql57-community-release-el7-8.noarch
mysql-community-libs-5.7.29-1.el7.x86_64
mysql-community-server-5.7.29-1.el7.x86_64

step2: 卸载mysql

• rpm -ev --nodeps
• 卸载前要先关闭mysql 服务

[root@cluster01 yum.repos.d]# rpm -ev --nodeps mysql-community-common-5.7.29-1.el7.x86_64

[root@cluster01 yum.repos.d]# rpm -ev --nodeps mysql-community-client-5.7.29-1.el7.x86_64

[root@cluster01 yum.repos.d]# rpm -ev --nodeps mysql57-community-release-el7-8.noarch

[root@cluster01 yum.repos.d]# rpm -ev --nodeps mysql-community-libs-5.7.29-1.el7.x86_64

[root@cluster01 yum.repos.d]# rpm -ev --nodeps mysql-community-server-5.7.29-1.el7.x86_64

step3: 再次查看

[root@cluster01 yum.repos.d]# rpm -qa|grep -i mysql

step5: 删除与mysql 相关的文件

• find / -name mysql

[root@cluster01 yum.repos.d]# find / -name mysql
/usr/share/mysql
/usr/lib64/mysql

[root@cluster01 yum.repos.d]# rm -rf /usr/share/mysql
[root@cluster01 yum.repos.d]# rm -rf /usr/lib64/mysql
[root@cluster01 yum.repos.d]# find / -name mysql
[root@cluster01 yum.repos.d]#