每個版本可能不一樣：
測試是Ubuntu 14.04版本，mysql5.7.10
官網下載wget -c http://downloads.mysql.com/archives/get/file/mysql-server_5.7.10-1ubuntu14.04_amd64.deb-bundle.tar
tar -xvf ***deb-bundle.tar 大概有10+個deb包
官網順序http://dev.mysql.com/doc/refman/5.7/en/linux-installation-debian.html
tar -xvf mysql-server_MVER-DVER_CPU.deb-bundle.tar
sudo apt-get install libaio1
sudo dpkg-preconfigure mysql-community-server_*.deb
sudo dpkg -i mysql-{common,community-client,client,community-server,server}_*.deb
還敲了一陣sudo apt search libaio 和sudo apt install libaio1指令
后來執行sudo apt-get -f install 解決
回退5.7到5.6.21的重裝過程
刪除 mysql
sudo apt-get autoremove --purge mysql-server
sudo apt-get remove mysql-server
sudo apt-get autoremove mysql-server
sudo apt-get autoremove mysql-common
清理殘留數據
dpkg -l |grep ^rc|awk '{print $2}' |grep mysql | sudo xargs dpkg -P
重裝mysql，官網文檔上的順序
tar -xvf mysql-server_MVER-DVER_CPU.deb-bundle.tar
sudo apt-get install libaio1
sudo dpkg -i mysql-common_MVER-DVER_CPU.deb
sudo dpkg-preconfigure mysql-community-server_MVER-DVER_CPU.deb
sudo dpkg -i mysql-community-server_MVER-DVER_CPU.deb
sudo dpkg -i mysql-community-client_MVER-DVER_CPU.deb
sudo dpkg -i libmysqlclient18_MVER-DVER_CPU.deb
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sudo /etc/init.d/mysql start 服務啟動
sudo /etc/init.d/mysql stop
使用戶可以從其它地址可以訪問服務器
首先得修改/etc/mysql/my.cnf文件，將bind-address = 127.0.0.1修改為 0.0.0.0
並賦予其訪問權限grant all on *.* to root@'%' identified by "passwd"; flush privileges;
升級過程中error用：mysql_upgrade mysql -h127.0.0.1 -uroot -p123456