Command running as root but not with sudo

I'm currently configuring a Samba 4 DC on CentOS 7.

As myself, samba-tool runs fine but when I run sudo samba-tool I get command not found.

samba-tool is located in /usr/local/samba/bin. I've added the directory to the PATH for both myself and root.

As myself, env | ^PATH= correctly includes the above directory. However, sudo env | ^PATH= shows only PATH=/sbin:/bin:/usr/sbin:/usr/bin.

Switching now to the root user. env | ^PATH= returns PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/samba/bin:/usr/local/samba/sbin and samba-tool runs just fine.

It was my intuition that sudo perfectly mirrored the root user, which I guess is not the case. A fix and hopefully an explanation is highly appreciated.

Solution 1:

It may be your sudo uses PATH defined in /etc/sudoers file, not the root's PATH. Check man 5 sudoers, look for the secure_path option.

You may also read
How to make sudo preserve $PATH?

Hint: use visudo to edit /etc/sudoers. The tool does some sanity check and may save you from the situation when you lose sudo access due to invalid edit.