MySQL無法啟動問題解決Warning: World-writable config file ‘/etc/my.cnf’ is ignored

• 今天重啟一台內網服務器，發現mysql無法正常重啟，執行systemctl start mysql，報錯如下

    Starting LSB: start and stop MySQL...
    Dec 11 14:24:42 localhost.localdomain mysql[32329]: my_print_defaults: [Warning] World-writable config file '/etc/my.cnf' is ignored.
    Dec 11 14:24:42 localhost.localdomain mysql[32329]: Starting MySQL.my_print_defaults: [Warning] World-writable config file '/etc/my.cnf' is ignored.
    Dec 11 14:24:42 localhost.localdomain mysql[32329]: my_print_defaults: [Warning] World-writable config file '/etc/my.cnf' is ignored.
    Dec 11 14:24:42 localhost.localdomain mysql[32329]: Logging to '/usr/local/mysql/data/localhost.localdomain.err'.
    Dec 11 14:24:43 localhost.localdomain mysql[32329]: ERROR! The server quit without updating PID file (/usr/local/mysql/data/localhost.localdomain.pid).
    Dec 11 14:24:43 localhost.localdomain systemd[1]: mysql.service: control process exited, code=exited status=1

• 剛開始關注點放在了 ERROR! The server quit without updating PID file (/usr/local/mysql/data/localhost.localdomain.pid). 這里，發現mysql下沒有data這個文件夾，以為數據庫文件丟失了呢，頭疼。

• 后來將關注點放到 my_print_defaults: [Warning] World-writable config file '/etc/my.cnf' is ignored.

  • 查看my.cnf的權限，
  • ls -l /etc/my.cnf
  • -rwxrwxrwx 1 root root 1404 Oct 16 19:31 /etc/my.cnf ， 發現是777權限
  • chmod 644 /etc/my.cnf ， 設置為644權限
  • systemctl start mysql ， 一切OK

• 另外，發現無法遠程連接，之前設置過IP，用戶訪問權限，但還是重新設置了一遍，並開放端口3306，才可以遠程連接（由於設置權限和開放端口沒有分開執行，所以並未確定是端口還是權限造成的）。

    GRANT ALL PRIVILEGES ON *.* TO 'username '@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;

    FLUSH   PRIVILEGES;

    iptables -I INPUT -p tcp --dport 3306-j ACCEPT
    
    遠程連接成功