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Learn how to remove the open base dir restriction for a special directory that Plesk automatically creates for subdomains.

Steps to fix open_basedir restriction for subdomains

We assume that the domain name is $domain.com, the name of the subdomain is $subDomName. You have to replace these values with the appropriate values.

Our goal is to open access to the public website directory and the /tmp directory for the special subdirectory. The directories are mentioned in the php_admin_value open_basedir

1. Create a special vhost.conf file for the subdomain.
   Create /srv/www/vhosts/$domain.com/subdomains/$subDomName/conf/vhost.conf with the following content:
   
   <Directory /srv/www/vhosts/$domain.com/subdomains/$subDomName/httpdocs>
<IfModule sapi_apache2.c>
                php_admin_flag engine on
                php_admin_flag safe_mode off
                php_admin_value open_basedir "/srv/www/vhosts/$domain.com/httpdocs:/srv/www/vhosts/$domain.com/subdomains/$subDomName/httpdocs:/tmp"
        </IfModule>
        <IfModule mod_php5.c>
                php_admin_flag engine on
                php_admin_flag safe_mode off
                php_admin_value open_basedir "/srv/www/vhosts/$domain.com/httpdocs:/srv/www/vhosts/$domain.com/subdomains/$subDomName/httpdocs:/tmp"
        </IfModule>
</Directory>
2. The next step is to apply the created configuration and recreate the apache configuration.
   Execute the following command on the command line to update the Plesk configuration:
   /usr/local/psa/admin/sbin/websrvmng -u --vhost-name=domain.tld
3. Final and last step is to restart apache
   apache2ctl  restart

That's all, now your open_basedir restriction is gone away.