rancher dashboard打开正常，登录一直卡主超时。

k3s storage用的是mysql，重启mysql问题解决，修改mysql连接数限制，防止以后类似发生。

SHOW VARIABLES LIKE 'max_connections';

SELECT @@global.max_connections;

SHOW STATUS LIKE 'Threads_connected';

SHOW PROCESSLIST;

SELECT 
    VARIABLE_VALUE as max_connections
FROM 
    performance_schema.global_variables 
WHERE 
    VARIABLE_NAME = 'max_connections';
		

在 my.cnf中加入：
[mysqld]
max_connections = 1000
重启