Ubuntu - Secure

Hi,

There are some things you need you take care for your secure:

1. fail2ban
• http://www.servermom.com/how-to-install-fail2ban-to-protect-server-from-brute-force-ssh-login-attempts-ubuntu/370/
2. Generate SSH Public Key
1. Your computer
• cd .ssh
• ssh-keygen -t dsa
• Enter file in which to save the key (/home/shin/.ssh/id_dsa): your-name
• Enter passphrase (empty for no passphrase): your-hard-password
• Enter same passphrase again: re-type-your-hard-password
• We have your-name.pub file in .ssh folder, and copy it to your-server
• scp your-name.pub your-server-username@your-server:./your-name.pub
• scp your-name.pub your-server-username@your-server:./your-name.pub
• --OR--
• scp -P[port] your-name.pub your-server-username@your-server:./your-name.pub
• E.G.:
• my.pub my@server:./my.pub
• my.pub my@server:./my.pub
• my.pub -P22 my@server:./my.pub
• Type your password on your server
2. Your server
1. touch .ssh/authorized_keys
2. sudo chmod 600 .ssh/authorized_keys
3. cat your-name.pub >> .ssh/authorized_keys
4. rm your-name.pub
3. Try to access your-server using SSH Public Keys
• ssh your-server-username@your-server
• Type your-password when create your-name.pub file
4. Limit users can not access your-server using ssh
• sudo vim /etc/ssh/sshd_config
• AllowUsers <user1> <user2>

Good luck!