Magento 2 Pub/Static Correct File Permissions Guide

TL;DR truncate pub/static folder.

For me, I had an older installation, which probably had some symlinks and old files which no longer exist.

The issue checkInstallationFilePermissions is that it checks the permissions recursively. Files and folders. I had a missing symlink, and that returned false on the check if it's writable.

How to debug:

1. setup/src/Magento/Setup/Model/FilePermissions.php

2. Goto line 143 in method checkRecursiveDirectories

3. Add the lines var_dump($subDirectory);var_dump($subDirectory->isWritable());

4. Re run bin/magento setup:upgrade

now you'll see what is really wrong, and you can fix it. Personally i remove everything in pub/static, this will be auto generated content so you should not be worried about that.

You can refer http://devdocs.magento.com/

The important things:

• The owner of the Magento file system: Must have full control (read/write/execute) of all files and directories.

• Must not be the webserver user; it should be a different user.

• The web server user must have write access to the following files and directories:

  • var
  • app/etc
  • pub
  • (and probably new in 2.2.1:) generated

• In addition, the web server's group must own the Magento file system so that the Magento user (who is in the group) can share access to files with the web server user. (This includes files created by the Magento Admin or other web-based utilities.)

• We recommend setting the permissions as follows:

  • All directories have 770 permissions.

  • 770 permissions give full control (that is, read/write/execute) to the owner and to the group and no permissions to anyone else.

  • All files have 660 permissions.

  • 660 permissions mean the owner and the group can read and write but other users have no permissions.

You should set it as below:

cd <your Magento install dir> 

// 644 permission for files
find . -type f -exec chmod 644 {} \; 
                   
// 755 permission for directory
find . -type d -exec chmod 755 {} \;    

chmod 644 ./app/etc/*.xml

chown -R :<web server group> .

chmod u+x bin/magento

I hope this will help you.