![]() ![]() The next attempt by Rails to use this connection results in the error that the connection has gone away. If a connection in the pool is inactive for more than 8 hours MySQL closes it to avoid the memory overhead of unused connections. MySQL operates with a default wait_timeout setting of 28,800 seconds (8 hours). Rails relies upon connection pooling to eliminate the time overhead of spawning a database connection when a request comes in the default connection pool size is 5. The application log (in /data/app_name/current/log) shows an error like this: Mysql::Error: MySQL server has gone away. Mysql::Error: MySQL server has gone away Symptom The password is the same for the deploy user and the root user on the MySQL database.įor more information, see. Run the FLUSH HOSTS command, either through the mysql client or through mysqladmin. Frequent occurrences of this error may indicate an attack or possibly an otherwise undetectable network issue. ![]() After 10 consecutive failed authentications from a specific host that host is barred from further attempts to log in until the administrator flushes the hosts or the database instance is restarted. This is a security feature of MySQL to prevent unauthorized users from gaining access to your database instance. This error Host '.' is blocked because of many connection errors unblock with 'mysqladmin flush-hosts' appears, for example, in the application log, /data/app_name/current/log. MySQL: Host '.' is blocked because of many connection errors unblock with 'mysqladmin flush-hosts' Symptom See 500 errors after deploying / Gemfile missing database adapter. MySQL: 500 errors and "Please install the mysql2 adapter" error SymptomĪfter deploying, you see 500 errors and the deployment log shows “Please install the mysql2 adapter” error. Or sudo /etc/init.d/mysql stop sudo /etc/init.d/mysql start Via SSH, connect to the application and database instance (for single server environment) or the master database instance (for a clustered environment). If you change database configuration, you might need to restart the database. MySQL: Host ‘…’ is blocked because of many connection errors unblock with ‘mysqladmin flush-hosts’.MySQL: 500 errors and “Please install the mysql2 adapter” error.This page describes some things to check when troubleshooting your database.
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