> For the complete documentation index, see [llms.txt](https://platform9.com/kb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://platform9.com/kb/pmo/frequently-asked-questions/frequesnt-db-connection-errors-in-designate-logs.md).

# Frequent DB Connection Errors in Designate Logs

## Problem

Frequent db connection errors in the designate-mdns logs on the host with dns/designate role.

{% tabs %}
{% tab title="designate-mdns.logs" %}

```javascript
ERROR oslo_db.sqlalchemy.engines [req-927ce395-6d19-4caf-8d70-829d69003c28 - - - - -] Database connection was found disconnected; reconnecting: oslo_db.exception.DBConnectionError: (pymysql.err.OperationalError) (2006, "MySQL server has gone away (BrokenPipeError(32, 'Broken pipe'))")

ERROR oslo_db.sqlalchemy.engines [req-b2bd48e0-2a89-464d-84b3-9d2eefbfdae5 - - - - -] Database connection was found disconnected; reconnecting: oslo_db.exception.DBConnectionError: (pymysql.err.OperationalError) (2013, 'Lost connection to MySQL server  during query')
```

{% endtab %}
{% endtabs %}

## Environment

* Platform9 Managed OpenStack - 5.8.0.
* Host having Designate role applied.

## Cause

When the Designate query communication with MySQL is using UDP instead of TCP, it is expected to see the `Lost connection to MySQL server during query` errors when the packets are missed as per the UDP protocol.

{% hint style="info" %}
**Info**

Using UDP protocol for the Designate to MySQL communication will not affect the overall transmission.
{% endhint %}

## Answer

To avoid the connection errors seen due to the packet losses as part of the UDP protocol, It is recommended to use TCP protocol, as it guarantee the successful communication- hence no "Lost connection" errors in the desinate logs.

{% hint style="info" %}
**Info**

If the connection pooling is used, make sure the connection lifetime (or timeout, etc) is less than the configured `wait_timeout`.
{% endhint %}

To enable TCP protocol for communication add `all_tcp = true` in the designate config file. The timeout value can be mentioned in the designate configuration file as mentioned below:

{% tabs %}
{% tab title="Designate config file" %}

```javascript
[service:mdns]
tcp_recv_timeout = 10          # Timeout value
all_tcp = true                 # To enable TCP protocol
listen = 0.0.0.0:5354
```

{% endtab %}
{% endtabs %}

## Additional Information

The error `"MySQL server has gone away (BrokenPipeError(32, 'Broken pipe'))")` are observed when the connections have been idle for longer than the database server's `wait_timeout`setting.

A solution to this is to set sqlalchemy's `pool_recycle` time to (significantly) less than the database's `wait_timeout` and use optimistic disconnect handling.

For more details, please refer the official documentation- [Connection Pooling — SQLAlchemy 2.0 Documentation](http://docs.sqlalchemy.org/en/rel_0_7/core/pooling.html?highlight=pool_recycle#setting-pool-recycle)


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