Installation of mysql5.7.37 under CentOS7 [perfect solution]

   不在CentOS安装mysql8.0The reason is for some middleware incompatibility 比如mycat Unexpected things will happenbug 比如mycat连接mysqlThe status is that the connection is successful,But it can't get into the database A database freeze occurs 报1184错误的现象 So I hope everyone learns virtual machine time mysqlIt is recommended to install itmysql5.7的 myself frommysql8.0.28回退到mysql5.7.37 Various errors in between 太痛苦了 So here it ismysqlinstallation and uninstallation tutorials It is convenient for everyone to follow up

centos下mysql安装步骤

进入官网MySQL :: Download MySQL Community Server (Archived Versions)

选择Red Hat Linux 7 与 centos7是一样的 互相兼容

Select the version and corresponding system 下载第一个包 mysql-5.7.37-1.el7.x86_64.rpm-bundle.tar

Check to see if the system comes with itmariadb和mysql

[[email protected] ~]# rpm -qa |grep mysql

[[email protected] ~]# rpm -qa |grep postfix

[[email protected] ~]# rpm -qa |grep mariadb

 卸载命令

rpm -e --nodeps xxx

安装需要的依赖文件

 

yum -y install libaio

yum -y install net-tools

yum -y install perl

安装mysql5.7.37

最好将mysqlA series of files are grouped into a folder Then unzip in this directory

tar -xvf mysql-5.7.37-1.el7.x86_64.rpm-bundle.tar

Install the following files in order 必须按照顺序安装

 

rpm -ivh mysql-community-common-5.7.37-1.el7.x86_64.rpm

rpm -ivh mysql-community-libs-5.7.37-1.el7.x86_64.rpm

rpm -ivh mysql-community-libs-compat-5.7.37-1.el7.x86_64.rpm

rpm -ivh mysql-community-client-5.7.37-1.el7.x86_64.rpm

rpm -ivh mysql-community-server-5.7.37-1.el7.x86_64.rpm

Also available heremysql8.0.28的安装顺序,与mysql5.7还是有点区别的

1. mysql-community-common

2. mysql-community-client-plugins

3. mysql-community-libs

4. mysql-community-client

5. mysql-community-icu-data-files

6. mysql-community-server

启动mysql

 

先查看mysql的状态

• 命令1： service mysqld status

• 命令2： systemctl status mysqld

启动mysql服务

• 命令1 service mysqld start

• 命令2 systemctl start mysqld

查看mysql进程

ps -ef | grep mysqld

设置mysql开机自启(根据自身需求 可要可不要)

systemctl enable mysqld #设置开机启动
systemctl disable mysqld #关闭开机启动

获取mysql初始化密码

 MySQLThe service initialization password is automatically generated and we need to query it mysqld.log查询初始化密码

grep password /var/log/mysqld.log

 A temporary password is generated for [email protected]: xxxxxx

（xxxxxxThis is the initial password 进入mysql复制即可）

登录MySQL修改初始化密码

mysql -uroot -p

It cannot be used if the initialization password has not been changedmysqlThe service will prompt you to recharge in seconds before the operation can be performed

重置密码

 mysql> set password = password("123456");
 Query OK, 0 rows affected, 1 warning (0.01 sec)
 
 mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+

 MySQL5.7The default password policy for the version is as follows

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      |
+--------------------------------------+--------+

If the password setting is too simple, the system will prompt that the current policy is not satisfied 会出现以下错误

[[email protected] opt]# mysql -uroot -p
mysql> set password = password("123456");
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

If the development and test environment is too troublesome, you can use the following commands to modify the password policy

mysql> set global validate_password_policy=LOW;
mysql> set global validate_password_length=6;

Review the default password policy again

mysql>  SHOW VARIABLES LIKE 'validate_password%'; 
+--------------------------------------+-------+
| Variable_name                        | Value |
+--------------------------------------+-------+
| validate_password_check_user_name    | OFF   |
| validate_password_dictionary_file    |       |
| validate_password_length             | 6     |
| validate_password_mixed_case_count   | 1     |
| validate_password_number_count       | 1     |
| validate_password_policy             | LOW   |
| validate_password_special_char_count | 1     |
+--------------------------------------+-------+
7 rows in set (0.01 sec)

The simple password reset was successful again

mysql> set password = password("123456");
Query OK, 0 rows affected, 1 warning (0.00 sec)

设置mysql远程访问权限

The command to enable remote access needs to be executed on the command line

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
Query OK, 0 rows affected, 1 warning (0.00 sec)

客户端连接MySQL服务

默认情况下Centos防火墙是开启状态 Query the firewall status with the following command

systemctl status firewalld

方式1 关闭防火墙（Not recommended for corporate environments)

# 关闭
systemctl stop firewalld.service
# 禁用
systemctl disable firewalld

方式2 开放mysql服务端口

# Add the port number that needs to be released
firewall-cmd --add-port=端口号/tcp --zone=public --pernament
# Remove the port number that needs to be released
firewall-cmd --remove-port=端口号/tcp --zone=public --pernament
# 查看放行的端口号
firewall-cmd --list-ports

启动防火墙

# 开启
systemctl start firewalld.service
# 重启
systemctl restart firewalld.service

After closing or releasing the port number, it is found that the remote access is successful

 至此centos下mysqlThe installation is completed perfectly