If you really want, you can also specify this timeout on a per-user basis. You can change this timeout to 20 minutes by adding the following option to your sudoers file with visudo. You should now be allowed to use the sudo command.īy default, sudo will ask you for your password after 5 minutes of not using it. # Uncomment to allow people in group wheel to run all commands This shows our recommended configuration: If you have no sensitive data on your machine, and absolutely trust that no one but you would ever use it or get into it, you can uncomment the NOPASSWD one, otherwise, I do highly recommend the first option. You will then see two lines that mention the wheel group. %users ALL=(ALL) ALL # WARNING! Only use this together with 'Defaults targetpw'! Put # signs at the beginning of these lines:(if not found)ĭefaults targetpw # ask for the password of the target user i.e. Now you can launch visudo as root: /usr/sbin/visudo Open up a terminal, and make sure the EDITOR variable is set to your preferred editor, otherwise you will be editing the sudoers file using vi. Before hand, you may want to do the next step, however. You will need to logout and log back in for the membership changes to take affect. Add yourself to the line that says wheel: wheel:x:10:tstrombe When you run a system command as a regular user, you need to invoke sudo it before the command you wish to execute in privileged more. You can use the graphical management tools that come with your system, or simply use your favorite text editor as the root user, and edit /etc/group. It is a command that Linux users utilize for executing system-related tasks with privileged or elevated privileges. If it does not say wheel, you will want to add yourself to the wheel group. Sudo allows an authorized user to temporarily elevate their privileges. Instead, users are encouraged to make use of a tool by the name of ‘sudo’ to carry out system administrative duties. % groups wheel uucp dialout audio video condor The following steps will demonstrate how to set up a new user with sudo access on Ubuntu / CentOS / RedHat (RHEL) without having to change the /etc/sudoers. Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. If you type the groups command, you will see a list of groups that you are an active member of. This will start a root shell: sudo -sįor more tips, I recommend looking at the sudo manual. This is not recommended because it will not log the commands you execute under this shell, though it sometimes makes things more convenient when you do not have access to a directory you would like to work in. In rare instances, you may need to start an entire shell as another user. If you would like to run commands as a user other than root, use sudo -u username program arguments, like so: sudo -u condor /usr/local/sbin/condor_start If you would like to run a command as root, simply type sudo program arguments. Best of all, sudo logs every command that is run through it, so you can easily track down any issues that may arise. On top of that, you can specify only to grant them access to certain commands on certain hosts. The beauty of sudo is that you can grant root access to certain users without giving them the root password. In normal use, it is setup so that people in the wheel group can run commands as root if they give it their password. Sure, they're incorrect, but they're better than nothing, especially if you accidentally delete the contents of the original files.Sudo (superuser do) is a great tool for restricting access to the root account (or other accounts). Once you're there, before you make any changes, it's a good idea to make backup copies of your two corrupt files. Either way-password or not-you'll end up logged in as root. Or, if you set a root password in your installation, you'll be prompted for your root password. You know when you boot up, you get several options for how you want to boot up? There's usually a kernel, recovery mode, and memtest at the very least.Īfter you boot into recovery mode, you should be logged in as root. The answer is something called recovery mode. Now, this begs the question, "How can I edit the /etc/group file if I don't have sudo permissions?" Substitute your actual username for firstuser, of course. You may also want to consider donating directly to the Ubuntu project.įor troubleshooting purposes, the most important line in the /etc/group file is the one in bold, which specifies who is in the admin group, and hence who has sudo privileges. If you've found these tutorials useful, please consider donating a small amount to one of my favorite non-profits/charities.
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