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Merge pull request #1581 from archlemon/patch-2 

Update content.md
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@ -150,7 +150,7 @@ The `-v /my/own/datadir:/var/lib/mysql` part of the command mounts the `/my/own/
If there is no database initialized when the container starts, then a default database will be created. While this is the expected behavior, this means that it will not accept incoming connections until such initialization completes. This may cause issues when using automation tools, such as `docker-compose`, which start several containers simultaneously.
If the application you're trying to connect to MySQL does not handle MySQL downtime or waiting for MySQL to start gracefully, then a putting a connect-retry loop before the service starts might be necessary. For an example of such an implementation in the official images, see [WordPress](https://github.com/docker-library/wordpress/blob/1b48b4bccd7adb0f7ea1431c7b470a40e186f3da/docker-entrypoint.sh#L195-L235) or [Bonita](https://github.com/docker-library/docs/blob/9660a0cccb87d8db842f33bc0578d769caaf3ba9/bonita/stack.yml#L28-L44).
If the application you're trying to connect to MySQL does not handle MySQL downtime or waiting for MySQL to start gracefully, then putting a connect-retry loop before the service starts might be necessary. For an example of such an implementation in the official images, see [WordPress](https://github.com/docker-library/wordpress/blob/1b48b4bccd7adb0f7ea1431c7b470a40e186f3da/docker-entrypoint.sh#L195-L235) or [Bonita](https://github.com/docker-library/docs/blob/9660a0cccb87d8db842f33bc0578d769caaf3ba9/bonita/stack.yml#L28-L44).
## Usage against an existing database