mysql安裝完成后不能用命令
systemctl start mysqld #啟動
systemctl stop mysqld #停止
解決辦法：
find / -name mysql.server
會出現服務路徑：
/home/swkj/tools/mysql/mysql-5.7.31-linux-glibc2.12-x86_64/support-files/mysql.server
然后根據路徑啟動
/home/swkj/tools/mysql/mysql-5.7.31-linux-glibc2.12-x86_64/support-files/mysql.server start
Shutting down MySQL.... SUCCESS! 輸出這一行，就說明執行成功
用/home/swkj/tools/mysql/mysql-5.7.31-linux-glibc2.12-x86_64/support-files/mysql.server stop
可以關閉成功