考研去了，几个月没管项目，今天一打开数据库挂了，各种问号，按照网上一些步骤执行命令却把mysql彻底搞崩了，突然料到可能是因为我阿里云装的宝塔面板还有一堆其他东西导致相同的命令别人行我却不行，无奈，干脆写一个从头到尾自动删除和重装mysql的脚本，最好是能一执行完就能直接navicat连接的那种！

先直接看效果：

（彻底删除mysql的部分截图）

（自动配置mysql的部分截图）

(对，然后就连接成功了)

shell脚本代码如下：

当然你也可以直接在github上下载最新版本:点这里

#删除mysql及其相关依赖包
echo "正在删除mysql及其相关依赖包..."
rpm -qa | grep -i mysql | xargs rpm -e --nodeps
echo "Done."

#删除mysql所涉及的安装目录
echo "正在删除mysql所涉及的安装目录..."
whereis mysql | xargs rm -rf
echo "Done."

#删除所有和mysql相关的目录
echo "正在删除所有和mysql相关的目录..."
find / -name mysql | xargs rm -rf
echo "Done."

#删除所有配置文件
echo "正在删除所有配置文件..."
find / -name my.cnf* | xargs rm -rf
echo "Done."

echo "正在删除mysql开机自启动服务..."
#删除mysql开机自启动服务
chkconfig --del mysqld
echo "Done."

#解决yum被锁的情况
echo "正在防止yum被锁..."
rm -f /var/run/yum.pid
echo "Done."

##   为了解决'安装mysql安装源'步骤时发生如下错误：
#    Warning: RPMDB altered outside of yum.
#    Found 2 pre-existing rpmdb problem(s), 'yum check' output follows:
#    2:postfix-2.10.1-6.el7.x86_64 has missing requires of libmysqlclient.so.18()(64bit)
#    2:postfix-2.10.1-6.el7.x86_64 has missing requires of libmysqlclient.so.18(libmysqlclient_18)(64bit)

echo "正在安装Deltarpm包（增量 RPM 套件）..."
yum provides '*/applydeltarpm'  #安装Deltarpm包（增量 RPM 套件）
yum install deltarpm -y
echo "Done."

echo "正在配置正确的yum源..."
echo "Done."

yum install epel-release -y #配置正确的yum源
echo "正在清除本地yum缓存..."
yum clean all  ##清除本地yum缓存
echo "Done."

echo "正在同步本地软件和epel源的软件包信息..."
yum distro-sync ##同步本地软件和epel源的软件包信息
echo "Done."

#下载MySQL安装
echo "正在下载MySQL安装包..."
wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
echo "Done."

#安装mysql安装源
echo "正在安装mysql安装源..."
yum -y localinstall mysql57-community-release-el7-11.noarch.rpm
echo "Done."

#在线安装MySQL
echo "正在安装MySQL...."
yum -y install mysql-community-server
echo "Done."

#启动MySQL服务
echo "正在启动MySQL服务..."
systemctl start mysqld
echo "Done."

#设置开机启动
echo "正在配置开机自启..."
systemctl enable mysqld
systemctl daemon-reload
echo "Done."

#防火墙开放3306端口
echo "正在开放3306端口..."
firewall-cmd --zone=public --add-port=3306/tcp --permanent
firewall-cmd --reload
echo "Done."

#配置mysql默认编码为utf-8
echo "配置mysql默认编码为utf-8..."
echo "character_set_server=utf8" >> /etc/my.cnf
echo "init_connect='SET NAMES utf8'" >> /etc/my.cnf
echo "Done."

#从mysqld.log文件中找到临时生成的密码所在行
PWD=`cat /var/log/mysqld.log | grep root@localhost`
#截取获取密码
PWD=${PWD##*:}
echo "------------------------------- Note ------------------------------------"
echo "mysql5.7默认密码策略要求密码必须是大小写字母数字特殊字母的组合，至少8位"
echo "你的临时密码:"$PWD"             your temporary password:"$PWD
echo "-------------------------------------------------------------------------"
echo ""
echo "接下来你只需要一步步复制执行即可"
echo "step1.  mysql -u root -p"
echo "step2.  ALTER USER 'root'@'localhost' IDENTIFIED BY 'YOUR_PASSWORD';"
echo "step3.  GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'YOUR_PASSWORD' WITH GRANT OPTION;"
echo "step4.  FLUSH PRIVILEGES;"
echo "step5.  EXIT"
echo "step6.  systemctl restart mysqld"

（温馨提示：1.请在root下执行 2.同时保证脚本文件有权执行 3.重装前最好把你mysql数据导出来）