Linux Group Permissions not being enforced correctly.
I am running Ubuntu 10.04 server and am having some very counter-intuitive experiences with users/groups. For example:
sudo touch test_file # create empty file
sudo groupadd test # create 'test' group
sudo chown root:test test_file # change group of file to 'test'
sudo chmod g+rwx test_file # give write permissions to group
sudo usermod -a -G test {my-user} # add my user to 'test' group
touch test_file # touch the file as my current user
The last line produces a permissions error.
I have ensured that my user is part of the 'test' group (groups {my-user}
confirms this). The group of test_file is also definitely set to 'test' and the group permissions are set.
Why can't my user write to the file test file?
Solution 1:
When adding a user to a new group, that won't be applied in any currently-running processes, only new ones. You need to log out and then log back in.
Solution 2:
Both logging out and rebooting server methods didn't work for me.
This method however is working for me: (reference to this answer)
chmod g+rwxs <parent folder>