I got a database server failure, says host is blocked because of many connection errors. It ask me to unblock with 'mysqladmin flush-hosts'
how and where should I run this command to our amazon rds database server?
thank you
This question is related to
mysql
amazon-rds
You can flush hosts local MySQL using following command:
mysqladmin -u [username] -p flush-hosts
**** [MySQL password]
or
mysqladmin flush-hosts -u [username] -p
**** [MySQL password]
Though Amazon RDS database server is on network then use the following command as like as flush network MySQL server:
mysqladmin -h <RDS ENDPOINT URL> -P <PORT> -u <USER> -p flush-hosts
mysqladmin -h [YOUR RDS END POINT URL] -P 3306 -u [DB USER] -p flush-hosts
In additional suggestion you can permanently solve blocked of many connections error problem by editing my.ini file[Mysql configuration file]
change variables max_connections = 10000;
or
login into MySQL using command line -
mysql -u [username] -p
**** [MySQL password]
put the below command into MySQL window
SET GLOBAL max_connect_errors=10000;
set global max_connections = 200;
check veritable using command-
show variables like "max_connections";
show variables like "max_connect_errors";
Since the hosts is blocked. try connect it from other host and execute the mysqladmin flush-hosts command.
mysqladmin -h <RDS ENDPOINT URL> -P <PORT> -u <USER> -p flush-hosts
I fixed this error on my RDS instance by rebooting it from the AWS management console. HTH
[edit: lol downvotes]
When an Amazon RDS instance is blocked because the value of max_connect_errors has been exceeded, you cannot use the host that generated the connection errors to issue the "flush hosts" command, as the MySQL Server running on the instance is at that point blocking connections from that host.
You therefore need to issue the "flush hosts" command from another EC2 instance or remote server that has access to that RDS instance.
mysqladmin -h [YOUR RDS END POINT URL] -P 3306 -u [DB USER] -p flush-hosts
If this involved launching a new instance, or creating/modifying security groups to permit external access, it may be quicker to simply login to the RDS user interface and reboot the RDS instance that is blocked.
On Amazon RDS FLUSH HOSTS; can be executed from default user ("Master Username" in RDS info), and it helps.
You can restart the database on RDS Admin.
You will have to connect your RDS through a computer which as mysql installed on it I used one of my hosting VPS using SSH
After i was logged in my VPS ( i used putty ) It was simple, in the prompt i entered the following command:
mysqladmin -h [YOUR RDS END POINT URL] -P 3306 -u [DB USER] -p flush-hosts
Login to any other EC2 instance you have that has access to the RDS instance in question and has mysqladmin installed and run
mysqladmin -h <RDS ENDPOINT URL> -P 3306 -u <USER> -p flush-hosts
you will be prompted for your password
For normal MySQL, just connect as the 'root' administrative super user, and issue the command:
FLUSH HOSTS
Even in the case of too many connections, MySQL should be keeping a connection in reserve so that a super user can connect.
The mysqladmin client generally connects as root anyway and issues the above SQL.
Source: Stackoverflow.com