ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';
flush privileges;

Downloading packages:
warning: /var/cache/yum/x86_64/7/mysql80-community/packages/mysql-community-client-8.0.36-1.el7.x86_64.rpm: Header V4 RSA/SHA256 Signature, key ID a8d3785c: NOKEY
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql


The GPG keys listed for the "MySQL 8.0 Community Server" repository are already installed but they are not correct for this package.
Check that the correct key URLs are configured for this repository.


 Failing package is: mysql-community-client-8.0.36-1.el7.x86_64
 GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

yum install net-tools -y # 檢查和安裝網(wǎng)絡(luò)工具包
yum list installed | grep mysql # 檢查已安裝的MySQL安裝包
rpm -e --nodeps mysql80-community-release-el7-8.noarch # 強(qiáng)制刪除指定的MySQL倉(cāng)庫(kù)包，不檢查依賴。
rm -rf /etc/my.cnf # 刪除MySQL的主配置文件。
rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022 # 導(dǎo)入MySQL的GPG公鑰，用于驗(yàn)證軟件包。
rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-2.noarch.rpm# 安裝新的MySQL倉(cāng)庫(kù)配置包。
yum -y install mysql-community-server# 安裝MySQL服務(wù)器及其依賴。

yum -y install mysql-community-server  --nogpgcheck # 忽略GPG密鑰檢查，重新安裝
systemctl start mysqld && systemctl enable mysqld # 啟動(dòng)MySQL服務(wù)并設(shè)置為開(kāi)機(jī)啟動(dòng)。
systemctl status mysqld # 檢查MySQL服務(wù)狀態(tài)，確認(rèn)服務(wù)已經(jīng)運(yùn)行
grep 'temporary password' /var/log/mysqld.log # 獲取隨機(jī)密碼并登錄

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';
set global validate_password.policy=0;
ALTER USER USER() IDENTIFIED BY 'wingkin45@A.';
set global validate_password.policy=0;
set global validate_password.length=4;
ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456';
flush privileges;

echo "INFO : BEGIN INSTALLING MYSQL8 ..."
#檢查mysql服務(wù)版本，若存在Mysql8,直接退出
me=`ps -ef|grep mysqld|wc -l`
if [ $me -eq 2 ];then
        me=`systemctl status mysqld|grep Docs|awk -F: '{print $NF}'`
        if [ $? -eq 0 -a "$me" == "mysql(8)" ];then
                echo "INFO : MYSQL8 FOUND "
                exit 0
        fi

        #若存在舊版本的mysql,且服務(wù)處于啟動(dòng)狀態(tài)
        systemctl status mysqld|grep "active (running)"
        if [ $? -eq 0 ];then
                systemctl stop mysqld
                echo "INFO : OLD MYSQL SERVICE FOUND BUT STOPPED"
        fi
fi
#若存在舊版本的殘留，則直接卸載
names=`rpm -qa|grep mysql`
for name in $names;do
        yum -y remove $name 1>/dev/null 2>&1
        echo "INFO : OLD MYSQL RESOURCE [ $name ] FOUND AND REMOVED"
done

#rpm 安裝mysql8
src=$1
if [[ ! -e $src || ! -f $src ]];then
        echo "ERROR : PLEASE PROVIDE MYSQL8 RPM FILE "
        exit 1
fi
if [[ ! "$src" =~ mysql8.*\.rpm$ ]];then
        echo "ERROR : RPM PACKAGE OR NOT MYSQL8"
        exit 1
fi

rpm -ivh $src 1>/dev/null 2>&1
if [ $? -eq 0 ];then
        echo "INFO : SUCCESS TO RPM INSTALL MYSQL8"
else
        echo "ERROR : FAIL TO RPM INSTALL MYSQL8"
        exit 2
fi

# yum 安裝mysql8服務(wù)
yum -y install mysql-community-server --nogpgcheck 1>/dev/null 2>&1
if [ $? -eq 0 ];then
        echo "INFO : SUCCESS TO YUM MYSQL8 SERVICE"
else
        echo "ERROR : FAIL TO YUM MYSQL8 SERVICE"
        exit 3
fi

#檢查服務(wù)是否已啟動(dòng),若未啟動(dòng)則啟動(dòng)
me=`systemctl status mysqld|grep "active (running)"`
if [ $? -ne 0 ];then
        systemctl start mysqld
fi
echo "INFO : MYSQL8 SERVICE STARTED"

echo "INFO : FINISH INSTALL MYSQL8"

unset me
unset names
unset src