Please do post your queries and feedback in below comments sections. Now, if we run admin commands via sudo then it will not prompt for the password. # echo -e "sysadm\tALL=(ALL)\tNOPASSWD: ALL" > /etc/sudoers.d/sysadm The second/third commands allows all members of group 'root' to be superuser without a password, versus only allowing the user 'root' su privileges for authentications. Run beneath echo command to complete above task, $ su - sudo sed -i s/ auth sufficient pamwheel.so trust/auth sufficient pamwheel.so trust/g /etc/pam.d/su Step 2 OR type. In case, you want to run sudo commands without password, then edit the sudoer files, comment out the line â %wheel ALL=(ALL) ALLâ and uncomment â # %wheel ALL=(ALL) NOPASSWD: ALLâ # vi /etc/sudoersĪlternate way to run sudo commands without password is that create a separate file with name like â sysadmâ under the directory â /etc/sudoers.dâ and add the following entry. If you have noticed carefully, we must specify password for executing admin commands via sudo. Output of above command would like below:Ībove confirms that user has sudo rights and can run admin commands. To confirm whether newly created user has sudo rights or not, run couple of admin commands and donât forget to type sudo in front of commands.įirst switch to regular user or login with regular user and run following commands, # su - sysadm Run beneath command to verify whether user is part of wheel group or not. Use following command to add an existing regular user to wheel group, Note: Replace the password string with the password that you want to set for the user. Letâs assume we want to create a user with name âsysadmâ, run following useradd command # useradd -G wheel sysadmĪssign the password to above newly created user with beneath passwd command, # echo | passwd sysadm -stdin While creating a new regular user, specify âwheelâ as secondary group. The above only let's userZ become userX, nothing more.Login to your system as root user or if you have logged-in as regular user switch to root user, use following command $ su - root 2) Create regular user with useradd command NOTE: The above can also be done so that userZ has to use their password to run the su command too. Giving your users sudo permission to those scripts, as everyone else has already said is the correct way to give them the ability to manage those daemons. userZ ALL=(root) NOPASSWD: /bin/su - userX Now, if you go changing the init scripts to do su -c you WILL BREAK the daemon as it expects to be run under a certain enviroment.You want to parcel out the ability to only become a specific user using sudo. Next, add the user (for example aaronk) that you want to su to the account postgres without a password to the group postgres using usermod command. You can get rid of this protection by adding this rule to sudoers instead. Configure PAM to Allow Running Su Command without Password. From the terminal it would be something like this: rootcs01: su foo foocs01:/root cd foocs01: ls. The above approach will still challenge you for userZ's password. I need to login in ssh to a server, do 'su username' (without password) to execute some commands as that user (that have no direct login in ssh). To explain this you need to know what the programs do: su - The command su is used to switch to another user (s witch u ser), but you can also switch to the root user by invoking the command with no parameter.su asks you for the password of the user to switch, after typing the password you switched to the users environment. NOTE: You edit the sudoers file using the command visudo as root! userZ ALL=(ALL) ALL We can also configure sudo usage without any passwords by tweaking this file. You can grant additional permissions to regular users by adding them to the sudoers list. Configure sudo Without Password The sudoers file in Linux allows admins to manage usage rights for different users. Add the following rule to your sudoers file, /etc/sudoers. Luckily, you can easily use the sudo command without passwords. You want the ability to do anything as root, such as, becoming other users, without providing their password. The CentOS Wiki does a very good job of covering this entire topic that you're asking about here in this articled titled: How To Become Root. If you're absolutely positive that you, (userZ), want to become another user (userX) without providing userX's password, AND you don't want to have to become root first then you're likely looking for sudo. After creating the account with the command useradd you need to run the following command as root to set a password for this newly created account: $ passwd
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