1. linux安裝mysql8.0.12，親測可用。
以下是安裝過程中出現的問題：
1 [root@localtest1 file]# systemctl start mysqld 2 Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details. 3 4 [root@localtest1 file]# systemctl status mysqld 5 ● mysqld.service - MySQL Server 6 Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled) 7 Active: failed (Result: exit-code) since Tue 2018-09-11 19:58:27 CST; 15s ago 8 Docs: man:mysqld(8) 9 http://dev.mysql.com/doc/refman/en/using-systemd.html 10 Process: 29481 ExecStart=/usr/sbin/mysqld $MYSQLD_OPTS (code=exited, status=1/FAILURE) 11 Process: 29454 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS) 12 Main PID: 29481 (code=exited, status=1/FAILURE) 13 Status: "SERVER_BOOTING" 14 Error: 98 (Address already in use) 15 16 Sep 11 19:58:23 localtest1.guandata.com systemd[1]: Starting MySQL Server... 17 Sep 11 19:58:27 localtest1.guandata.com systemd[1]: mysqld.service: main process exited, code=exited, status=1/FAILURE 18 Sep 11 19:58:27 localtest1.guandata.com systemd[1]: Failed to start MySQL Server. 19 Sep 11 19:58:27 localtest1.guandata.com systemd[1]: Unit mysqld.service entered failed state. 20 Sep 11 19:58:27 localtest1.guandata.com systemd[1]: mysqld.service failed. 21 [root@localtest1 file]# lsof -i :3306 22 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME 23 docker-pr 17413 root 4u IPv6 23187758 0t0 TCP *:mysql (LISTEN) 24 25 原因：docker中已使用mysql並占用3306端口。由於我是測試自己的項目，就改了自己的mysql的端口號，重新裝了一個mysql。
修改mysql端口號： [root@localtest1 file]# vi /etc/my.cnf 增加行： port=7566
2. 安裝過程中會用到的linux命令
1 啟動mysqld服務 2 systemctl start mysqld 3 4 查看mysqld狀態 5 systemctl status mysqld 6 7 查看mysql日志 8 tail -n 100 /var/log/mysqld.log 9 10 列出誰在使用某個端口(https://www.cnblogs.com/sparkbj/p/7161669.html) 11 lsof -i :7566 12 13 netstat命令用來打印Linux中網絡系統的狀態信息 14 netstat -anp|grep 0715