Shell学习成果之一键自动安装Mysql8.0

实验环境

系统：Centos7.7.1908 

Mysql：mysql-8.0.18-el7-x86_64.tar.gz

一键安装脚本如下(可直接复制粘贴为shell脚本，与Mysql安装包放到同一目录；如果没有下载安装包就取消第26行的注释会自动下载MySQL安装包)

*************************************************************************START************************************************************************

#!/bin/bash
#auto install mysql8.0
#by 网络小虾米 2019-11-19

olddb=`rpm -qa|grep mariadb` &&rpm -e --nodeps $olddb ;

useradd -M -s /sbin/nologin mysql &&
mkdir -p /usr/local/mysql &&
mkdir -p /usr/local/mysql/data &&
mkdir -p /usr/local/mysql/log &&
mkdir -p /usr/local/mysql/log/binlog &&
mkdir -p /usr/local/mysql/log/tmp &&
touch /usr/local/mysql/log/mysqld.log &&
chmod -R 777 /usr/local/mysql/log/ &&
chmod -R 777 /usr/local/mysql/data &&
chown -R mysql:mysql /usr/local/mysql/

if [ $? -eq 0 ];then
    echo -e "33[32mMysql environment Great SueeCSSfully!33[0m"
else
    echo -e "33[32mMysql environment Great Failed,Please check it.33[0m"
    exit
fi

#wget -c  https://cdn.mysql.com//Downloads/MySQL-8.0/mysql-8.0.18-el7-x86_64.tar.gz ;
tar -xzvf mysql-8.0.18-el7-x86_64.tar.gz &&
mv mysql-8.0.18-el7-x86_64/* /usr/local/mysql/ ;

cd /usr/local/mysql &&/usr/local/mysql/bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data/ --log-error=/usr/local/mysql/log/mysqld.log ;
if [ $? -eq 0 ];then
    echo -e "33[32mMysql8.0 install complete!33[0m"
else
    echo -e "33[32mMysql8.0 install Failed.please check it.33[0m"
    exit
fi

touch /etc/my.cnf ;
echo "
[client]
port=3306
default-character-set=utf8

[mysqld]
port=3306
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
user=mysql
default-storage-engine=INNODB
character-set-server=utf8

bind-address=0.0.0.0

[mysqld_safe]
log-error=/usr/local/mysql/log/mysqld.log" >> /etc/my.cnf ;

chmod 644 /etc/my.cnf &&chown -R mysql:mysql /etc/my.cnf ;

cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld ;
sed -i "46s/basedir=/basedir=/usr/local/mysql/g" /etc/init.d/mysqld &&sed -i "47s/datadir=/datadir=/usr/local/mysql/g" /etc/init.d/mysqld ;
chmod +x /etc/init.d/mysqld &&service mysqld start

if [ $? -eq 0 ];then
    echo -e "33[32mMysql 8.0 auto install successfully!33[0m"
else
    echo -e "33[32mMysql8.0 auto install Failed,Please check it.33[0m"
    exit
fi

echo "export PATH=$PATH:/usr/local/mysql/bin" >>/etc/profile &&source /etc/profile ;
chkconfig  --add mysqld &&chkconfig mysqld on
exit

**************************************************************************END*************************************************************************

脚本运行完成后，MySql安装完成并启动，然后修改默认密码

#cat /usr/local/mysql/log/mysqld.log

一般在日志的第二行，找到[Server] A temporary passWord is generated for root@localhost: d5iGg/rg0oGC  //冒号后面的是默认密码

#mysql -uroot -p

#Enter password:d5iGg/rg0ogC 根据实际密码进行输入

#alter user "root"@"localhost" identified by "qwe123!@#";

#flush privileges;

设置远程访问

>use mysql;

>select host, user, plugin from user;

>alter user "root"@"localhost" identified with mysql_native_password by "qwe123!@#";

>update user set host="%" where user="root";

>flush privileges;

>grant all privileges on *.* to "root"@"%" with grant option;

>flush privileges;

>select host, user, authentication_string, plugin from user;

>exit;

排错

### /usr/local/mysql/bin/mysqld safe--defaults-file=/etc/my.cnf --user=mysql###安全模式启动mysql