ISPConfig 3 custom logo

ISPConfig 3.1

open phpmyadmin on ispconfig master server, in sys_ini.default_logo, and there is a sys_ini.custom_logo which you should be adding/changing your custom logo to.

The content is output directly into html output, and format is "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMg.......".

To convert your file contents to base64 text you can use the 'base64' program, which on debian comes in the 'coreutils' package or online with base64-image converter.
Eg. the base64 output for the default logo is:

Code:
# base64 < /usr/local/ispconfig/interface/web/themes/default/assets/images/logo.png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You of course need to prepend `data:image/png;base64,` to that. 

perhaps you need it ? so change the db structure for the logo fields from typ "TEXT" to "LONGTEXT" if Logo is to large in base64 (225 x 60 pixel).

Quelle: howtoforge.com/Jesse Norell