系统环境：CENTOS7
MYSQL：mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz
MYSQL的安装包的路径：/shared/app/mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz
[root@v75 shell]# cat installmysql.sh
#!/bin/bash
egrep "^mysql" /etc/group >& /dev/null
if [ $? -ne 0 ]
then
groupadd mysql
fi
egrep "^mysql" /etc/passwd >& /dev/null
if [ $? -ne 0 ]
then
useradd -r -g mysql -s /bin/false mysql
fi
if [ ! -d /usr/local/mysql ];then
mkdir -p /usr/local/mysql/var
else
mv /usr/local/mysql /usr/local/mysqlold
mkdir -p /usr/local/mysql/var
fi
tar -zxvf /shared/app/mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz -C /usr/local/mysql/
mv /usr/local/mysql/mysql-5.7.22-linux-glibc2.12-x86_64/* /usr/local/mysql/
cd /usr/local/
chown -R mysql:mysql mysql
chmod 750 mysql
cd mysql
if [ -f /etc/my.cnf ];
then
mv /etc/my.cnf /etc/my.cnf.bak
fi
cat << EOF >> /etc/my.cnf
[mysqld]
character_set_server=utf8
init_connect='SET NAMES utf8'
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
socket=/tmp/mysql.sock
log-error=/usr/local/mysql/var/mysqld.log
pid-file=/usr/local/mysql/var/mysqld.pid
EOF
bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --lc_messages_dir=/usr/local/mysql/share --lc_messages=en_US
cd /usr/local/
chown -R mysql:mysql mysql
if [ -f /etc/init.d/mysqld ];
then
mv /etc/init.d/mysqld /etc/init.d/mysqld.bak
fi
cp mysql/support-files/mysql.server /etc/init.d/mysqld
echo "PATH=$PATH:/usr/local/mysql/bin" >> /etc/profile
echo "export PATH" >> /etc/profile
source /etc/profile
str=`cat /usr/local/mysql/var/mysqld.log | grep "A temporary password is generated for"`
pwd=${str:0-12}
echo "mysql init pwd is "$pwd
执行脚本：
[root@v75 shell]# sh installmysql.sh
注意脚本最后一行打印的是mysql的初始密码12位，保存起来或者更改
可直接运行启动命令：
[root@v75 shell]# /etc/init.d/mysqld start
Starting MySQL.[ 确定 ]
[root@v75 shell]# mysql -uroot -p
Enter password:
改密码：mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpass');