ARM64架构下安装mysql5.7.22的全过程

MySQL下载地址为：

https://obs.cn-north-4.myhuaweicloud.com/obs-mirror-ftp4/database/mysql-5.7.27-aarch64.tar.gz

1. 添加mysql用户组和mysql用户，用于隔离mysql进程
# groupadd -r mysql && useradd -r -g mysql -s /sbin/nologin -M mysql
2.安装依赖库
# yum install -y libaio*
3. 下载解压Mysql
# wgethttps://obs.cn-north-4.myhuaweicloud.com/obs-mirror-ftp4/database/mysql-5.7.27-aarch64.tar.gz
# tar xzvf mysql-5.7.27-aarch64.tar.gz -C /usr/local/
4.配置Mysql
# mv /usr/local/mysql-5.7.27-aarch64 /usr/local/mysql
# mkdir -p /usr/local/mysql/logs
# chown -R mysql:mysql /usr/local/mysql
# ln -sf /usr/local/mysql/my.cnf /etc/my.cnf
# cp -rf /usr/local/mysql/extra/lib* /usr/lib64/
# mv /usr/lib64/libstdc++.so.6 /usr/lib64/libstdc++.so.6.old
# ln -s /usr/lib64/libstdc++.so.6.0.24 /usr/lib64/libstdc++.so.6

# 设置开机启动
# cp -rf /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld
# chmod +x /etc/init.d/mysqld
# systemctl enable mysqld
5. 添加环境变量
# vim /etc/profile

添加下面两行代码：
export MYSQL_HOME=/usr/local/mysql
export PATH=$PATH:$MYSQL_HOME/bin

# source /etc/profile

5. 初始化启动mysql
# 无密码初始化登录
# mysqld --initialize-insecure --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data

！！！执行这里出现错误：

解决方法：

vim /etc/my.cnf
查看文件，寻找datadir=...
查看到：datadir=/usr/local/mysql/data, 
这个是data保存目录。
进入/usr/local/mysql/data后，查看到确实有数据：
将/usr/local/mysql/data备份，
cd /usr/local/mysql
mv data data.bak
接着执行：
mysqld --initialize-insecure --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data