[root@uat01 ~]# cat InstallMysql01.sh #!/bin/bash#2018-10-13#旅行者-Travel#1.安裝wgetyum -y install wget#2、下載mysql的yum源URL="https://repo.mysql.com//mysql80-community-release-el7-1.noarch.rpm"wget $URL -P /etc/yum.repos.d/yum -y install yum-utils #如果沒有該包，下邊執行yum-config-manager不生效yum -y install /etc/yum.repos.d/mysql80-community-release-el7-1.noarch.rpm if [ $? -eq 0 ];then  rm -rf /etc/yum.repos.d/mysql80-community-release-el7-1.noarch* fiyum-config-manager --disable mysql80-communityyum-config-manager --enable mysql57-communityyum -y install mysql-community-server sleep 5 systemctl start mysqld  systemctl enable mysqld systemctl status mysqld if [ $? -eq 0 ];then  echo -e "install succefull"  result="`grep 'temporary password' /var/log/mysqld.log`"  p1="`echo $result |awk '{print $NF}'`"  echo "數據庫密碼為:$p1"  fi[root@uat01 ~]# 

install succefull數據庫密碼為:9aTR&ok>f;1K[root@uat01 ~]# mysql -uroot -pEnter password: Welcome to the MySQL monitor. Commands end with ; or /g.Your MySQL connection id is 2Server version: 5.7.23Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.mysql> set global validate_password_policy=0;Query OK, 0 rows affected (0.00 sec)mysql> set global validate_password_length=4;Query OK, 0 rows affected (0.00 sec)mysql> alter user 'root'@'localhost' identified by 'Yanglt123.';Query OK, 0 rows affected (0.00 sec)mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)mysql> quit

[root@uat01 ~]# mysql -uroot -p.....Server version: 5.7.23 MySQL Community ......mysql> show variables like 'validate_password%';+--------------------------------------+-------+| Variable_name      | Value |+--------------------------------------+-------+| validate_password_check_user_name | OFF || validate_password_dictionary_file |  || validate_password_length    | 4  || 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 (0.00 sec)mysql> 

mysql> set global validate_password_policy=0;Query OK, 0 rows affected (0.00 sec)mysql> set global validate_password_length=4;Query OK, 0 rows affected (0.00 sec),mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)

mysql> alter user 'root'@'localhost' identified by '1234'; #測試發現密碼長度最少為4位Query OK, 0 rows affected (0.00 sec)mysql> flush privileges;Query OK, 0 rows affected (0.01 sec)mysql> quitBye[root@uat01 ~]# mysql -pEnter password: Welcome to the MySQL monitor. Commands end with ; or /g.Your MySQL connection id is 5Server version: 5.7.23 MySQL Community Server (GPL)Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.mysql>