how to set up linux

by Hao Chen
~1 min read

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Linux

  1. how to set up ssh keys :door:

     # setup user login over ssh
 mkdir -p ~/.ssh
 touch ~/.ssh/authorized_keys
 # add your public key into authorized_keys 
    
 # disable password login
 # update value in /etc/ssh/sshd_config
    
 # To disable tunneled clear text passwords, change to no here!
 # PasswordAuthentication * => PasswordAuthentication no
 # PermitEmptyPasswords * => PermitEmptyPasswords no
 # ChallengeResponseAuthentication * => ChallengeResponseAuthentication no
 # UsePAM * => UsePAM no
    
 # disbale root login
 # PermitRootLogin * => PermitRootLogin no
 sudo systemctl restart sshd

  2. add a new user

     # Then add a new user that will be able to use sudo.
 useradd -m -G sudo <username> # (-m creates the home directory /home/user; -G adds the user to the sudoers group)
 # set the password for the new user
 passwd <username>

  3. sudo without password :door:

     sudo su -
 echo "`whoami`     ALL=(ALL) NOPASSWD:ALL" > /etc/sudoers.d/sudoers
 "`whoami` ALL=(ALL) NOPASSWD: NOPASSWD: ALL"
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