A little trick to simplify your apache virtual hosts configuration, instead of full paths you can use some predefined variables like the directory of apache logs or the configuration directory.

${APACHE_LOG_DIR} is for /var/log/apache2

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ErrorLog ${APACHE_LOG_DIR}/access.log
CustomLog ${APACHE_LOG_DIR}/error.log

$APACHE_CONFDIR is for /etc/apache2

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$APACHE_CONFDIR/mods-available