Failed to write cache file

[Wang Chao]

After i use bin/console make:controller create a new controller, i failed to see the page from browser:

IOException
Failed to write file "/var/www/symfony/var/cache/dev/srcDevDebugProjectContainer.xml".

it seems not the permissions problem, because i can use file_put_contents("/var/www/symfony/var/cache/dev/srcDevDebugProjectContainer.xml", "xxxx") to write the file.

how to fix this problem?

[Wang Chao]

i switch to use this symfony docker project( https://github.com/maxpou/docker-symfony ).