What do you mean by "binded" ? Did you symlink the /var/www directory of Pop into the /var/www directory of Solus ? And how did you install mysql on Solus (since in the repos there's MariaDB and not MySql) ? Simply linking the directories is not enough, you need to have the corresponding applications up and running to get something useful out of it.
By the way, a ping toward 127.0.0.1 (since your hostfile is plainly saying "pop.piwigo.cerulean IP is 127.0.0.1") will always respond with 0% packet loss, even if the website itself is not up and running. Try with wget: wget pop.piwigo.cerulean, if you get an error even with that it means that your webserver is dead (and your website with it) or misconfigured.
