When login into server using SSH, it’s more safe and easier using SSH key rather than password.
Before start, check my username on the computer
whoami
And use this username for easier setup
1. On remote server, switch to sudor
sudo su
2. Adding user and put password
adduser {user}
3. Switch to the created user
su {user}
cd ~/.ssh
4. Create key
ssh-keygen
5. Open ~/.ssh/id_rsa.pub from local computer and copy public key
ssh-rsa {some keys goes here}
6. Create authorized_keys file on remote server and paste public key
vi authorized_keys
7. Change Authorized key permission, make sure it has 600 permission
chmod 600 authorized_keys
8. Optionally, delete id_rsa, id_rsa.pub on remove server, it’s not used and not necessary to keep.
9. make login without password
sudo vi /etc/ssh/sshd_config
make sure PermitRootLogin line has like this:
PermitRootLogin without-password
10. Reload ssh
sudo service ssh restart
11. Try to login to remote server without password:
ssh {user}@{remove-server-ip}
12. Optionally, you can login without user name, just use ip address:
sudo su
vi /etc/sudoers.d/admin
Add like this
{user} ALL=(ALL) NOPASSWD:ALL
After change, give admin file permission to 400.
chmod 400 admin
13. If you want to allow login with password SSH or SFTP, change below.
sudo vi /etc/ssh/sshd_config
Then uncomment below
PasswordAuthentication yes
