How to override Magento local.xml stores base url
Please add below code in app/etc/local.xml
<stores>
<default>
<web>
<unsecure>
<base_url>http://your url</base_url>
</unsecure>
</web>
</default>
<admin>
<web>
<unsecure>
<base_url>http://your url</base_url>
</unsecure>
</web>
</admin>
</stores>