Laravel The stream or file "/storage/logs/laravel.log" could not be opened: failed to open stream: Permission denied

Question

I'm running Laravel app on server (Ubuntu 16.04). I have an error

The stream or file "/var/www/mydomain.com/storage/logs/laravel.log" could not be opened: failed to open stream: Permission denied

I've already google my question. I found this answer, but it wasn't helpful. I can't set 777 permission for storage (it's dangerous), as was suggested by many other answers I found.
Any other suggestions?

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UPDATE:

sudo chgrp -R www-data storage bootstrap/cache
sudo chmod -R ug+rwx storage bootstrap/cache

was helpful

Homologate

Actually, in the answer, the user is saying to never set 777 to this directory, and suggesting to change the directory ownership. – Arabist

So I did that and it wasn't helpful (as I mentioned in question) – Homologate

What did you set the permissions to? You likely want something like root:www 700 set for the logs directory (setting it for just the .log file may not be sufficient) – Dunlap

@Dunlap I set permissions to root... – Homologate

Sorry, it should obviously be 770 above; the group write permissions are required too. Please include at least the output of ls against the logs directory in your question to show its permissions and ownership. – Dunlap

@Dunlap you wish I show laravel logs? (I hope I understood you correctly) – Homologate

Answer 1

This commands were helpful:

sudo chgrp -R www-data storage bootstrap/cache
sudo chmod -R ug+rwx storage bootstrap/cache

Homologate