Host is blocked because of many connection errors
max_connect_errors 參數含義：如果某一客戶端嘗試連接此MySQL服務器，但是失敗（如密碼錯誤等等）X次，則MySQL會無條件強制阻止此客戶端連接
解決方法：
1、set global max_connect_errors=1000; --可以動態修改
當這一客戶端成功連接一次MySQL服務器後，針對此客戶端的max_connect_errors會清零。
2、 mysqladmin flush-hosts 或者 mysql>flush hosts;
Host is blocked because of many connection errors
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