Tag: ssh
Setting up SSH for New Users
by admin on Feb.06, 2009, under Server Maintenance
Make sure you are root, let’s get cracking!
/usr/sbin/useradd username – create the user
su username
passwd username – set the password
When you log into your new created user, you will create hidden directory called “.ssh”. In this directory, you will also create a file called “authorized_keys”.
mkdir .ssh
cd .ssh
touch authorized_keys
You will need to generate a key from your local machine to use to authenticate when you login. On your local machine, let’s get generating! Use command “ssh-keygen -t rsa”. You will be prompted for a password. This is optional. Once completed, a public and private key will be saved in the “~/.ssh” folder.
On your remote server, you need to copy the public key information.
scp ~/.ssh/id_rsa.pub myremoteuser@11.22.33.44:~/
cat id_rsa.pub >> ~/.ssh/authorized_keys
rm id_rsa.pub
chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys
Once, you add this in, make sure the user is setup in the ‘AllowUsers’ of SS for SSH Access. This is set in the /etc/ssh/sshd_config file. Since you are using SSH keys, you don’t need a password anymore, so set “PasswordAuthentication yes” to “PasswordAuthentication no”.
/usr/sbin/visudo – If you want to give some sudo permissions for this user.
Creating a New User in CentOS 5
by admin on Jan.25, 2009, under Server Maintenance
Creating a New User in CentOS 5
1. SSH to your server as root
2. Create a user: /usr/sbin/useradd newuser
3. Expire ther user immediately: /usr/bin/chage -d 0 newuser
4. Set blank password: /usr/sbin/usermod -p “” newuser
5. If you want to set the user’s password:
* su newuser
* passwd
Changing password for user newuser
New UNIX password: <enter your password>
Retype new UNIX password: <enter your password>
passwd: all authentication tokens updated successfully.
That’s it! From there on, you have a user that can be used to host your website or blog!
