Finding Files, and Assigning Permissions and Ownership

We're going to need elevated privileges for this lab, so once we're logged in let's just become root right off with sudo -i.

Use the find command to provide a detailed listing of the /opt/ directory:

find /opt

Our myapp directory is sitting in there, now let's see what happening in there as far as files go, like who owns them:

find /opt/myapp -ls

The root user owns everything. That's not good. We've got to change that.

Use the chown command to change user ownership to the cloud_user and the group devop for the /opt/myapp directory and its contents:

find /opt/myapp -exec sudo chown cloud_user:devop {} \;

To test, run find /opt/myapp -ls again, and see if our chown command actually changed ownership on these files.

It worked. Now we've got some permissions problems though.

Use the chmod command to set rw-rw----, or 660, permissions on all /opt/myapp files, except for the directory itself and the /opt/myapp/start.sh script:

find /opt/myapp -name "d*" -ok chmod 660 {} \;

Just type y for each yes/no prompt.

Next, change permissions on anything that does not start with d (the directory itself and the start.sh script):

find /opt/myapp '!' -name "d*" -ok chmod 770 {} \;

Again, type y for each yes/no prompt.

Use the find command to find any directories in /home files which lack a user and group owner:

find /home -nouser -nogroup -ls

Find files and directories that were owned by devuser:

find /home -ls

Check for anything that doesn't have user or group ownership:

find /home -nouser -a -nogroup -ls

Run chown with find to modify files that have no current user or group ownership:

sudo find /home -nouser -nogroup -exec sudo chown cloud_user:cloud_user {} \;

Check that we got them all:

find /home -nouser -a -nogroup -ls

See if cloud_user owns them now:

find /home/devuser -ls