CentOS 7的預設yum倉庫中並沒有MySQL5.7，需要手動新增.

本文我們將介紹CentOS 7下MySQL5.7的安裝。

1. 新增Mysql5.7倉庫，可去官網https://dev.mysql.com/downloads/repo/yum/ 找到 yum 源 rpm 安裝包

sudo rpm -ivh https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm

2. 確認Mysql倉庫成功新增

sudo yum repolist all | grep mysql | grep
 
 enabled

         如果展示像下面,則表示成功新增倉庫:

mysql-connectors-community/x86_64  MySQL Connectors Community    enabled:     51
mysql-tools-community/x86_64       MySQL Tools Community         enabled:     63
mysql57-community/x86_64           MySQL 5.7 Community Server    enabled:    267
 

3. 開始安裝Mysql5.7

sudo yum -y install mysql-community-server

4. 啟動Mysql

#啟動
sudo systemctl start mysqld

#設定系統啟動時自動啟動
sudo systemctl enable mysqld

#檢視啟動狀態
sudo systemctl status mysqld

5. 設定資料庫編碼為utf8

#開啟配置檔案
sudo vim /etc/my.cnf

#新增如下程式碼

[client]
default-character-set=utf8

[mysql]
default
 
-character-set=utf8

[mysqld]
collation-server = utf8_unicode_ci
init-connect='SET NAMES utf8'
character-set-server = utf8

#重啟Mysql
sudo systemctl restart mysqld

6. 設定防火牆

sudo firewall-cmd --zone=public --permanent --add-service=mysql
sudo firewall-cmd --reload

7. 新增密碼

sudo systemctl stop mysqld

sudo mysqld --user=root --skip-grant-tables
mysql -uroot

UPDATE mysql.user SET authentication_string=PASSWORD('#password') where USER='root';
flush privilege;

sudo systemctl restart mysqld

8. 新增使用者用於遠端訪問

 #建立使用者並授權 
GRANT ALL PRIVILEGES ON *.* TO 使用者名稱@”%” IDENTIFIED BY ‘密碼’ WITH GRANT OPTION; 

flush privileges;

或者修改root為可遠端訪問

use mysql;
UPDATE user SET Host='%' WHERE User='root';
flush privileges;

WRANING

• ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

Solution：修改密碼。如

SET PASSWORD FOR 'root'@'localhost' = PASSWORD('123');

•  ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

Solution：密碼安全等級不夠，MySQL5.6以後加強了安全等級，密碼可按如下方式檢視

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