File: //usr/share/webmin/virtual-server/help/template_logrotate_shared.html
<header>Share logrotate configuration with all domains?</header>
When this is set to <b>No</b>, Virtualmin will create a separate block
in the <tt>logrotate</tt> configuration file for each virtual server. This
allows each to have different settings, but will cause the web server to be
restarted after the rotation of each domains' logs - possibly interrupting
service. <p>
Selecting <b>Yes</b> will cause all new domains to share a single configuration
block, which means the web server only has to be restarted once. However, it
is not possible to have different rotation settings for each domain. <p>
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