mysql 报 'Host ‘XXXXXX’ is blocked because of many connection errors'
1. 问题:服务启动时,日志报错,导致启动失败:
Caused by: com.mysql.cj.exceptions.CJException: null, message from server: "Host 'ip' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'"

2. 解决:
(1)如果mysql 在当前机器,使用 mysql -u 用户名 -p 输入密码登录mysql
(2) 如果mysql 不在当前机器,使用 mysql -h 主机地址 -u 用户名 -p 用户密码
(3) 执行:flush hosts;

ok
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