mysql 5.6升级到5.7.22

下载对应的包

wget  https://cdn.mysql.com//Downloads/MySQL-5.7/mysql-5.7.22-linux-glibc2.12-x86_64.tar

备份数据库（至少备份mysql）

innobackupex -uxbackup  -u root -p ocm123  --no-timestamp /data/backup/ 

手动在备一次
mv mysql mysql_bak
建立软连接
ln -s   /root/mysql-5.7.22-linux-glibc2.12-x86_64   mysql
查看mysql_upgrade 帮助文档 -s, --upgrade-system-tables Only upgrade the system tables, do not try to upgrade the data.
/etc/init.d/mysqld start
mysql_upgrade -s
/etc/init.d/mysqld restart
到此升级完成，注意观察error日志